WO2025115902A1 - Corps moulé contenant une résine à base de polyester recyclé - Google Patents

Corps moulé contenant une résine à base de polyester recyclé Download PDF

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Publication number
WO2025115902A1
WO2025115902A1 PCT/JP2024/041974 JP2024041974W WO2025115902A1 WO 2025115902 A1 WO2025115902 A1 WO 2025115902A1 JP 2024041974 W JP2024041974 W JP 2024041974W WO 2025115902 A1 WO2025115902 A1 WO 2025115902A1
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WIPO (PCT)
Prior art keywords
polymer
weight
resin composition
polyester resin
polyester
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PCT/JP2024/041974
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English (en)
Japanese (ja)
Inventor
公秀 西村
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Kaneka Corp
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Kaneka Corp
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/10—Esters
    • C08F220/26—Esters containing oxygen in addition to the carboxy oxygen
    • C08F220/32—Esters containing oxygen in addition to the carboxy oxygen containing epoxy radicals
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F265/00—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00
    • C08F265/04—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00 on to polymers of esters
    • C08F265/06—Polymerisation of acrylate or methacrylate esters on to polymers thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/78—Preparation processes
    • C08G63/80—Solid-state polycondensation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
    • C08L33/04—Homopolymers or copolymers of esters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
    • C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds

Definitions

  • the present invention relates to a molded body containing recycled polyester resin.
  • polyester resins have the problem that their melt viscosity decreases and their strength deteriorates each time they are recycled.
  • a known technique for solving this problem is to add a chain extender (sometimes called a "viscosity modifier” or “melt viscosity improver: MVI”) (see, for example, Patent Documents 1 to 3).
  • SSP solid-state polymerization
  • One embodiment of the present invention has been made in consideration of the above-mentioned problems, and its purpose is to provide a molded body containing recycled polyester resin that has excellent strength and reduced whitening.
  • the inventors conducted extensive research to solve the above problems, and as a result, completed the present invention.
  • a molded article according to one embodiment of the present invention is a molded article obtained by molding a resin composition containing a recycled polyester-based resin, wherein a haze of a solution of the molded article is 1.50% or more and a haze of the molded article is 7.5 or less:
  • the haze of the solution of the molded body is a value measured by carrying out the following steps (1) and (2) in this order: (1) dissolving the resin composition in hexafluoro-2-propanol to obtain a solution having a concentration of the resin composition of 0.05 g/mL; (2) Using a haze meter zero-adjusted with the hexafluoro-2-propanol, measure the haze of the resulting solution of the molded body;
  • the haze of the molded article is a value obtained by measurement using a haze meter.
  • the whitening inhibitor for polyester resins includes a polymer (A) obtained by polymerizing a monomer mixture (A) containing (a) 10% to 60% by weight of an epoxy group-containing monomer and (b) 40% to 90% by weight of an epoxy group-free monomer.
  • a method for producing a molded product includes a step of preparing a recycled polyester resin composition and a step of molding the recycled polyester resin composition
  • the step of preparing the recycled polyester resin composition includes a step of melt-kneading a whitening inhibitor for polyester resin and a polyester resin to prepare pellets containing the whitening inhibitor for polyester resin and the polyester resin, and a step of performing solid-phase polymerization using the pellets
  • the whitening inhibitor for polyester resin includes a polymer (A) obtained by polymerizing a monomer mixture (A) containing (a) 10 parts by weight to 60 parts by weight of an epoxy group-containing monomer, and (b) 40 parts by weight to 90 parts by weight of an epoxy group-free monomer.
  • a molded article according to one embodiment of the present invention is a molded article obtained by molding a resin composition containing a recycled polyester resin, wherein the haze of a solution of the molded article is 1.50% or more, and the haze of the molded article is 7.5 or less.
  • the haze of the solution of the molded body is a value measured by carrying out the following steps (1) and (2) in this order: (1) dissolving the resin composition in hexafluoro-2-propanol to obtain a solution having a concentration of the resin composition of 0.05 g/mL; (2) Using a haze meter zero-adjusted with the hexafluoro-2-propanol, measure the haze of the resulting solution of the molded body; The haze of the molded article is a value obtained by measurement using a haze meter.
  • the "molded body according to one embodiment of the present invention” may be referred to as the "molded body”.
  • the "resin composition containing recycled polyester resin” may be referred to as the "recycled polyester resin composition” or simply as the "resin composition”.
  • the resin composition that is the raw material of the molded body may also be referred to as the resin composition according to one embodiment of the present invention.
  • the "resin composition according to one embodiment of the present invention” may be referred to as the "resin composition”.
  • This molded product has excellent strength and reduces whitening.
  • the molded body contains recycled polyester resin. Therefore, one embodiment of the present invention can significantly reduce the amount of plastic waste generated and the amount of plastic used in production. As a result, one embodiment of the present invention can contribute to the achievement of Sustainable Development Goals (SDGs) such as Goal 12 "Ensure sustainable consumption and production patterns.”
  • SDGs Sustainable Development Goals
  • the present molded article is obtained by molding a resin composition containing a recycled polyester resin. It can also be said that the present molded article contains a resin composition containing a recycled polyester resin.
  • Recycled polyester resin refers to a polyester resin obtained by recycling the following (i) and/or (ii): (i) A polyester resin composition and/or a molded article that has once been manufactured into a product and then used and/or discarded; (ii) Waste polyester resin compositions and/or waste molded articles discharged during the production process of polyester resin compositions and/or molded articles.
  • polyester resins that have never been commercialized may be referred to as “virgin polyester resins" in this specification.
  • “Recycled polyester resins” in this specification also include mixtures of "virgin polyester resins” and recycled polyester resins.
  • the method for recycling polyester resins is not particularly limited, but any known method can be used, such as chemical recycling, material recycling, and thermal recycling.
  • the polyester resin may be an aromatic polyester having a structure in which an aromatic dicarboxylic acid or its ester derivative component is linked to a diol component such as an aliphatic diol or an alicyclic diol by an ester reaction.
  • the polyester resin may be obtained by polycondensing an aromatic dicarboxylic acid or its ester derivative component with a diol component such as an aliphatic diol or an alicyclic diol by a known method.
  • Aromatic dicarboxylic acids are not particularly limited, but examples thereof include phthalic acid, terephthalic acid, isophthalic acid, orthophthalic acid, 1,5-naphthalenedicarboxylic acid, 2,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 2,2'-biphenyldicarboxylic acid, 3,3'-biphenyldicarboxylic acid, 4,4'-biphenyldicarboxylic acid, 4,4'-diphenylethercarboxylic acid, 4,4'-diphenyletherdicarboxylic acid, 4,4'-diphenylmethanedicarboxylic acid, 4,4'-diphenylsulfonedicarboxylic acid, 4,4'-diphenylisopropylidenedicarboxylic acid, 1,2-bis(phenoxy)ethane-4,4'-dicarboxylic acid, bis(4,4-carboxyphenyl)methan
  • Aliphatic diols are not particularly limited, but examples thereof include ethylene glycol, propylene glycol, butylene glycol, hexylene glycol, neopentyl glycol, 2-methyl-1,3-propanediol, diethylene glycol, triethylene glycol, 1,5-pentanediol, 1,6-hexanediol, decamethylene glycol, bisphenol A ethylene oxide addition diol, polyethylene oxide glycol, and polypropylene oxide glycol.
  • Alicyclic diols include, for example, 1,4-cyclohexanedimethanol, 4,4-dicyclohexylhydroxymethane, and 4,4'-dicyclohexylhydroxypropane. Only one type of diol component may be used, or two or more types may be used in combination.
  • the polyester resin may be a polymer formed by copolymerizing an aromatic dicarboxylic acid or its ester derivative component as the main component, an aliphatic diol, and another dicarboxylic acid or its ester derivative component or a diol.
  • dicarboxylic acids include alicyclic dicarboxylic acids such as 1,4-cyclohexanedicarboxylic acid and 4,4'-dicyclohexyldicarboxylic acid.
  • the polyester resin may have a structural component derived from a trifunctional or higher monomer, such as glycerin, trimethylolpropane, pentaerythritol, trimellitic acid, or pyromellitic acid.
  • recycled polyester resins include, but are not limited to, recycled [polyethylene terephthalate], recycled [polypropylene terephthalate], recycled [polybutylene terephthalate], recycled [polyethylene-2,6-naphthalate], recycled [polybutylene naphthalate], recycled [poly 1,4-cyclohexylene dimethylene terephthalate], recycled [polyethylene-1,2-bis(phenoxy)ethane-4,4'-dicarboxylate], recycled [polyethylene isophthalate/terephthalate], recycled [polybutylene terephthalate/isophthalate], recycled [polybutylene terephthalate/decane dicarboxylate], recycled [polycyclohexane dimethylene terephthalate/isophthalate], recycled [polyester/polyether], recycled [glycol-modified polyethylene terephthalate], etc.
  • Glycol-modified polyethylene terephthalate refers to a copolymer
  • the polyester-based resin preferably includes one or more types selected from the group consisting of (i) recycled [polypropylene terephthalate], recycled [polybutylene terephthalate], recycled [polyethylene-2,6-naphthalate], recycled [polybutylene naphthalate], recycled [poly 1,4-cyclohexylene dimethylene terephthalate] and recycled [polyester/polyether], and may be composed of only one or more types selected from said group, or more preferably includes one or more types selected from the group consisting of (ii) recycled [polyethylene terephthalate] and recycled [polybutylene terephthalate], and may be composed of only one or more types selected from said group.
  • a recycled [polymer alloy] obtained by recycling a polymer alloy obtained from a mixture of multiple polymers containing a polyester resin may be used.
  • the recycled [polymer alloy] include recycled [polycarbonate/polyethylene terephthalate], recycled [polyethylene terephthalate/glycol-modified polyethylene terephthalate], and recycled [polyethylene terephthalate/copolymerized polyethylene terephthalate].
  • the recycled polyester resin may contain one or more selected from the group consisting of recycled [polycarbonate/polyethylene terephthalate], recycled [polyethylene terephthalate/glycol-modified polyethylene terephthalate], and recycled [polyethylene terephthalate/copolymerized polyethylene terephthalate], or may be composed of only one or more selected from the group.
  • This configuration has the advantage of being easily available.
  • the copolymerized polyethylene terephthalate refers to a resin in which a component (third component) other than the components (two components) constituting polyethylene terephthalate is copolymerized.
  • the molded article is preferably molded using a whitening inhibitor.
  • the resin composition preferably contains a whitening inhibitor.
  • the whitening inhibitor is not particularly limited.
  • a whitening inhibitor for polyester resins having the following composition is preferably used:
  • a whitening inhibitor for polyester resin for example, a whitening inhibitor for polyester resin according to one embodiment of the present invention described in the section [2.
  • Whitening inhibitor] below for example, a whitening inhibitor for polyester resin having the following composition, is also preferably used: a whitening inhibitor for polyester resin comprising a polymer (A) obtained by polymerizing a monomer mixture (A) containing (a) 10% to 60% by weight of an epoxy group-containing monomer, and (b) 40% to 90% by weight of an epoxy group-free monomer.
  • (a) epoxy group-containing monomer refers to a monomer that contains an epoxy group.
  • Epoxy groups have good reactivity with the terminal functional groups of recycled polyester resins. Therefore, it is preferable that the whitening inhibitor contains (a) an epoxy group-containing monomer.
  • the resin composition contains a whitening inhibitor
  • the reactive functional group for example, an epoxy group
  • the terminal functional group for example, a hydroxyl group or a carboxyl group
  • the whitening inhibitor contains the above-mentioned polymer (A), the dispersibility of the whitening inhibitor in the resin composition can be improved. It is presumed that this suppresses the whitening of the molded body. Note that the present invention is not limited to these mechanisms and presumptions.
  • the epoxy group-containing monomer (a) is not particularly limited.
  • the epoxy group-containing monomer is preferably an epoxy group-containing alkyl (meth)acrylate.
  • the following description will focus on the epoxy group-containing alkyl (meth)acrylate as component (a).
  • component (a) examples include, but are not limited to, glycidyl acrylate, glycidyl methacrylate, 4-hydroxybutyl acrylate glycidyl ether, 3,4-epoxycyclohexyl (meth)acrylate, allyl glycidyl ether, and ⁇ -methylglycidyl (meth)acrylate. Only one type of component (a) may be used, or two or more types may be used in combination.
  • the component (a) preferably contains one or more selected from the group consisting of (i) glycidyl acrylate, glycidyl methacrylate, 4-hydroxybutyl acrylate glycidyl ether, 3,4-epoxycyclohexyl (meth)acrylate, and ⁇ -methylglycidyl (meth)acrylate, and may be composed of only one or more selected from the group, and more preferably contains one or more selected from the group consisting of (ii) glycidyl acrylate, glycidyl methacrylate, 4-hydroxybutyl acrylate glycidyl ether, and 3,4-epoxycyclohexyl (meth)acrylate.
  • the compound contains one or more selected from the group consisting of glycidyl acrylate, glycidyl methacrylate, and 4-hydroxybutyl acrylate glycidyl ether, and may be composed of only one or more selected from the group; (iv) It is particularly preferable that the compound contains one or more selected from the group consisting of glycidyl acrylate and glycidyl methacrylate, and may be composed of only one or more selected from the group; (v) It is most preferable that the compound contains glycidyl methacrylate, and may be composed of only glycidyl methacrylate.
  • the content of component (a) in monomer mixture (A) is not particularly limited, but is preferably 10% to 60% by weight out of 100% by weight of monomer mixture (A).
  • the upper limit may be 55%, 50%, 45%, or 40% by weight, and the lower limit may be 15%, 20%, 25%, or 30% by weight. If the content of component (a) is within the above range, the effect of improving the melt viscosity of the resin composition can be good. As a result, there is an advantage that the moldability and strength of the molded product are superior.
  • excellent moldability of the molded product means that the thickness distribution of the molded product is more uniform.
  • (b) epoxy group-free monomer refers to a monomer other than "(a) epoxy group-containing monomer", i.e., a monomer that does not contain an epoxy group.
  • the (b) component is preferably an alkyl (meth)acrylate that does not have a reactive functional group (for example, an alkyl (meth)acrylate that does not contain an epoxy group).
  • alkyl (meth)acrylates that do not have a reactive functional group include alkyl (meth)acrylates with an alkyl group having 1 to 22 carbon atoms, such as methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, octyl (meth)acrylate, dodecyl (meth)acrylate, stearyl (meth)acrylate, and behenyl (meth)acrylate.
  • component (b) only one of the above-mentioned monomers may be used, or two or more of them may be used in combination.
  • the number of carbon atoms in the alkyl group in component (b) is not particularly limited, but from the viewpoint of polymerizability, it is preferable that it be 22 or less. Furthermore, from the viewpoint of compatibility with recycled polyester resins, it is more preferable that the number of carbon atoms in the alkyl group in component (b) be 12 or less, even more preferably 8 or less, and particularly preferably 1 to 4.
  • component (b) preferably contains one or more selected from the group consisting of non-epoxy-containing alkyl methacrylates, and may be composed of only one or more selected from this group; (ii) more preferably contains one or more selected from the group consisting of methyl methacrylate, ethyl methacrylate, propyl methacrylate, and butyl methacrylate, and may be composed of only one or more selected from this group; (iii) even more preferably contains one or more selected from the group consisting of methyl methacrylate and butyl methacrylate, and may be composed of only one or more selected from this group; and (iv) most preferably contains methyl methacrylate, and may be composed of only methyl methacrylate.
  • the content of component (b) in monomer mixture (A) is not particularly limited, but is preferably 40% to 90% by weight out of 100% by weight of monomer mixture (A).
  • the upper limit may be 85%, 80%, 75%, or 70% by weight, and the lower limit may be 45%, 50%, 55%, or 60% by weight. If the content of component (b) is within the above range, there is an advantage that the dispersibility of the whitening inhibitor in the resin composition can be improved. As a result, there is also an advantage that whitening of the obtained molded body is further suppressed.
  • Component may be, but is not limited to, one or more selected from the group consisting of vinyl cyanide compounds, aromatic vinyl compounds, (meth)acrylic acid, etc.
  • vinyl cyanide compound examples include acrylonitrile and methacrylonitrile.
  • the aromatic vinyl compounds are not particularly limited, but examples include styrene, vinyltoluene, ⁇ -methylstyrene, 4-methylstyrene, 3-methylstyrene, 4-methoxystyrene, 4-ethylstyrene, 4-ethoxystyrene, 3,4-dimethylstyrene, 2-chlorostyrene, 3-chlorostyrene, 4-chloro-3-methylstyrene, 3-(tert-butyl)styrene, 2,4-dichlorostyrene, 2,6-dichlorostyrene, and 1-vinylnaphthalene.
  • component (c) only one of the above-mentioned monomers may be used, or two or more of them may be used in combination.
  • component (c) (i) preferably contains one or more selected from the group consisting of 4-methylstyrene, 3-methylstyrene, ⁇ -methylstyrene, and styrene, and may be composed of only one or more selected from this group, (ii) more preferably contains one or more selected from the group consisting of 4-methylstyrene, ⁇ -methylstyrene, and styrene, and may be composed of only one or more selected from this group, (iii) even more preferably contains one or more selected from the group consisting of ⁇ -methylstyrene and styrene, and may be composed of only one or more selected from this group, and (iv) most preferably contains styrene, and may be composed of only styrene.
  • the content of aromatic vinyl compounds (especially styrene) in the monomer mixture (A) is as low as possible.
  • the content of aromatic vinyl compounds is preferably 10% by weight or less, more preferably 5% by weight or less, even more preferably 3% by weight or less, and particularly preferably 1% by weight or less.
  • the content of aromatic vinyl compounds is most preferably 0% by weight, that is, it is most preferable that the monomer mixture (A) does not contain aromatic vinyl compounds.
  • the content of styrene is 10% by weight or less, more preferably 5% by weight or less, even more preferably 3% by weight or less, and particularly preferably 1% by weight or less, in 100% by weight of the monomer mixture (A). It is most preferable that the styrene content is 0% by weight in 100% by weight of the monomer mixture (A), that is, it is most preferable that the monomer mixture (A) does not contain styrene.
  • the content of component (c) in monomer mixture (A) is not particularly limited, but is preferably 0 to 10% by weight out of 100% by weight of monomer mixture (A).
  • the upper limit may be 8% or 5% by weight, and the lower limit may be 2% or 4% by weight. If the content of component (c) is within the above range, there is an advantage in that productivity is improved.
  • the number average molecular weight of the polymer (A) is preferably in the range of 2,000 to 6,000.
  • the lower limit of the number average molecular weight of the polymer (A) is more preferably 3,000 or more, and may be 4,000 or more.
  • the upper limit of the number average molecular weight of the polymer (A) is more preferably 5,500 or less, more preferably 5,000 or less, even more preferably 4,500 or less, particularly preferably 4,000 or less, and may be 3,500 or less.
  • the number average molecular weight of the polymer (A) can be adjusted by using a chain transfer agent during polymerization of the polymer (A).
  • a chain transfer agent during polymerization of the polymer (A).
  • the number average molecular weight of the polymer (A) can be measured by gel permeation chromatography (GPC) and calculated in terms of polystyrene. The method for measuring the number average molecular weight of the polymer (A) will be described in detail in the examples below.
  • the polymer (A) preferably has an average of 2 to 15 reactive functional groups per molecule of the polymer (A).
  • the lower limit may be 3 or more.
  • the upper limit may be any of 13 or less, 11 or less, 9 or less, and 8 or less.
  • the polymer (A) is preferably a non-rubbery polymer.
  • a non-rubbery polymer refers to a polymer that does not have a cross-linked structure between the molecular chains of the polymer.
  • the polymerization method for the polymer (A) may be any known method, and is not particularly limited. For example, bulk polymerization, solution polymerization, suspension polymerization, emulsion polymerization, etc. may be adopted, and emulsion polymerization is preferred.
  • the polymer (A) is preferably a polymer obtained by emulsion polymerization.
  • the production of the whitening inhibitor preferably includes a step of obtaining the polymer (A) by emulsion polymerization.
  • emulsion polymerization means carrying out a polymerization reaction in the presence of an emulsifier, which will be described later.
  • the emulsifier may react to produce a salt derived from the emulsifier. Therefore, when the polymer (A) is a polymer obtained by emulsion polymerization, the polymer (A) may contain an emulsifier and/or a salt derived from the emulsifier, which will be described later.
  • a polymer containing an emulsifier and/or a salt derived from the emulsifier, which will be described later can also be considered to be a polymer obtained by emulsion polymerization.
  • polymer (A) When producing polymer (A), it is preferable to carry out the polymerization in the presence of a chain transfer agent in order to control the molecular weight. In other words, it is preferable that the monomer mixture (A) contains a chain transfer agent.
  • Chain transfer agents include, but are not limited to, primary mercaptan chain transfer agents such as n-butyl mercaptan, n-octyl mercaptan, n-hexadecyl mercaptan, n-dodecyl mercaptan, n-tetradecyl mercaptan, etc.; secondary mercaptan chain transfer agents such as sec-butyl mercaptan, sec-dodecyl mercaptan, etc.; tertiary mercaptan chain transfer agents such as t-dodecyl mercaptan, etc.; mercaptan compounds; thioglycolic acid esters such as 2-ethylhexyl thioglycolate, ethylene glycol dithioglycolate, trimethylolpropane tris(thioglycolate), pentaerythritol tetrakis(thiogly
  • Emulsifiers (dispersants) that can be used in emulsion polymerization are not particularly limited, but include anionic surfactants, nonionic surfactants, cationic surfactants, and amphoteric surfactants. Dispersants such as polyvinyl alcohol, alkyl-substituted cellulose, polyvinylpyrrolidone, and polyacrylic acid derivatives may also be used. One type of emulsifier (dispersant) may be used alone, or two or more types may be used in combination.
  • thermally decomposable initiator can be used as the radical polymerization initiator.
  • thermally decomposable initiator include known initiators such as 2,2'-azobisisobutyronitrile, hydrogen peroxide, potassium persulfate, and ammonium persulfate.
  • a redox type initiator can also be used as the radical polymerization initiator.
  • the redox type initiator is an initiator that uses (a) a peroxide such as an organic peroxide or an inorganic peroxide in combination with (b) a reducing agent such as sodium formaldehyde sulfoxylate or glucose, if necessary, a transition metal salt such as iron (II) sulfate, if necessary, a chelating agent such as disodium ethylenediaminetetraacetate, if necessary, and a phosphorus-containing compound such as sodium pyrophosphate, if necessary.
  • a peroxide such as an organic peroxide or an inorganic peroxide
  • a reducing agent such as sodium formaldehyde sulfoxylate or glucose
  • a transition metal salt such as iron (II) sulfate
  • a chelating agent such as disodium ethylenediaminetetraacetate, if necessary
  • Examples of the organic peroxide include t-butyl peroxyisopropyl carbonate, paramenthane hydroperoxide, cumene hydroperoxide, dicumyl peroxide, t-butyl hydroperoxide, di-t-butyl peroxide, and t-hexyl peroxide.
  • Examples of the inorganic peroxide include hydrogen peroxide, potassium persulfate, and ammonium persulfate.
  • a redox type initiator When a redox type initiator is used, polymerization can be carried out even at a low temperature where the peroxide does not substantially decompose thermally, and the polymerization temperature can be set in a wide range. For this reason, it is preferable to use a redox type initiator.
  • redox type initiators using organic peroxides such as cumene hydroperoxide, dicumyl peroxide, paramenthane hydroperoxide, and t-butyl hydroperoxide as the peroxide are preferable.
  • the amount of the initiator used, and when a redox type initiator is used, the amounts of the reducing agent, transition metal salt, chelating agent, etc. used can be within known ranges.
  • a known surfactant can also be used during polymerization of polymer (A).
  • a latex (e.g., aqueous latex) containing the polymer (A) can be obtained.
  • the polymer (A) can be obtained by separating the polymer (A) from the latex containing the polymer (A).
  • the obtained polymer (A) can be used as a whitening inhibitor.
  • the method for separating the polymer (A) from the latex containing the polymer (A) is not particularly limited, but examples include salting out the polymer (A) using an acid and a metal salt, and precipitating the polymer (A) using an organic solvent.
  • the polymer (A) separated from the latex containing the polymer (A) may be washed and further dried.
  • a powder of the polymer (A) (also referred to as "powder”) can be obtained by separating the polymer (A) from the latex containing the polymer (A), washing it, and further drying it.
  • a powder of the polymer (A) can also be obtained by spray drying the latex containing the polymer (A). The powder of the polymer (A) thus obtained can be used as a whitening inhibitor.
  • the whitening inhibitor may or may not contain a polymer (B) in addition to the polymer (A).
  • the polymer component in the whitening inhibitor may be composed of only the polymer (A), may be composed of only the polymer (A) and the polymer (B), or may be composed of the polymer (A), the polymer (B) and a polymer other than these.
  • case A The case where the whitening inhibitor contains polymer (A) and polymer (B) (hereinafter also referred to as "case A") will be described.
  • case A it is preferable to polymerize polymer (B) in the presence of polymer (A) after polymerizing polymer (A).
  • case A when polymer (A) is obtained by, for example, emulsion polymerization, it is particularly preferable to produce (polymerize) polymer (B) in latex containing polymer (A) after producing (polymerizing) polymer (A).
  • polymer (B) When producing (polymerizing) polymer (B) in latex containing polymer (A), a composite consisting of polymer (A) and polymer (B) (or containing polymer (A) and polymer (B)) can be obtained.
  • polymer (B) In the composite, polymer (B) can cover a part of polymer (A). Therefore, in the composite, polymer (A) can be referred to as the core part and polymer (B) as the shell part.
  • the composite can have a core-shell structure having polymer (A) as the core part and polymer (B) as the shell part.
  • polymer (B) when polymer (B) is produced (polymerized) in a latex containing polymer (A), a composite consisting of polymer (A) and polymer (B) can be obtained, in which polymer (A) forms the core and polymer (B) forms the shell, i.e., a composite having a core-shell structure.
  • polymer (B) may cover the entire polymer (A) or may be impregnated into the inside of particulate polymer (A).
  • the whitening inhibitor contains polymer (A) and polymer (B) and the composite of polymer (A) and polymer (B) has a core-shell structure in which polymer (A) forms the core and polymer (B) forms the shell, it has the advantage of improving productivity.
  • the polymer (B) is not particularly limited.
  • the composition of the constituent units of the polymer (B) may be the same as or different from the composition of the constituent units of the polymer (A).
  • the composition of the monomer mixture (B) may be the same as or different from the composition of the monomer mixture (A).
  • the polymer (B) is preferably a polymer obtained by polymerizing a monomer mixture (B) containing (a) 10% to 60% by weight of an epoxy group-containing monomer, and (b) 40% to 90% by weight of an epoxy group-free monomer.
  • the polymer (B) preferably further contains (c) 0% to 10% by weight of a vinyl monomer other than the components (a) and (b) that is copolymerizable with the components (a) and (b).
  • the number average molecular weight of polymer (B) is preferably different from the number average molecular weight of polymer (A). It is more preferable that the number average molecular weight of polymer (B) is larger than the number average molecular weight of polymer (A). This configuration increases the softening point of the polymer (composite), making it less likely that problems such as sticking will occur. As a result, this has the advantage of improving productivity.
  • the polymer (B) is preferably a non-rubber polymer.
  • This configuration has the advantage that the reaction between the reactive functional group of the polymer (B) and the terminal functional group of the recycled polyester resin proceeds more efficiently, making it easier to improve the melt viscosity of the resin composition.
  • the polymer (A) is a non-rubber polymer or the polymer (B) is a non-rubber polymer, and it is more preferable that both the polymer (A) and the polymer (B) are non-rubber polymers (for example, the entire complex is a non-rubber polymer).
  • the whitening inhibitor contains polymer (A) and polymer (B), and the composite made of polymer (A) and polymer (B) has a core-shell structure in which polymer (A) forms the core and polymer (B) forms the shell (hereinafter also referred to as "Case B") will be described.
  • the ratio of the weight of polymer (A) to the weight of polymer (B) in the composite is not particularly limited, but is preferably 20/80 to 80/20, more preferably 30/70 to 70/30, even more preferably 35/65 to 65/35, and particularly preferably 40/60 to 60/40. If the ratio of the weight of polymer (A) to the weight of polymer (B) in the composite is within the above range, there is an advantage in that productivity is improved.
  • the number average molecular weight of polymer (A) is not particularly limited, but is preferably 2,000 to 5,000, more preferably 2,000 to 4,000, even more preferably 2,500 to 4,000, and particularly preferably 2,500 to 3,500.
  • This configuration has the advantage of improving the balance between improving melt viscosity and suppressing whitening.
  • the number average molecular weight of polymer (B) is not particularly limited, but is preferably 3,000 to 6,000, more preferably 3,000 to 5,000, even more preferably 3,500 to 5,000, and particularly preferably 3,500 to 4,500. This configuration has the advantage of improving productivity.
  • the polymer (B) preferably has an average of 2 to 15 reactive functional groups per molecule of the polymer (B).
  • the lower limit may be 3 or more.
  • the upper limit may be any of 13 or less, 11 or less, and 9 or less.
  • Polymer (A) and polymer (B) may differ in one or more selected from the group consisting of the composition of the structural units, the number average molecular weight, the average number of reactive functional groups per molecule, and the epoxy equivalent.
  • the polymerization method of the polymer (B) can be a known method, and is not particularly limited. For example, bulk polymerization, solution polymerization, suspension polymerization, emulsion polymerization, etc. can be adopted, and emulsion polymerization is preferred.
  • a chain transfer agent in order to control the molecular weight.
  • the monomer mixture (B) preferably contains a chain transfer agent.
  • polymer (B) other than the matters mentioned above, the description in the section on polymer (A) may be used as appropriate.
  • the preferred aspects for polymer (A) (monomer mixture (A)) are also preferred for polymer (B) (monomer mixture (B)).
  • the amount of polymers with a molecular weight of 1000 or less in the whitening inhibitor is not particularly limited, but is preferably 4.00% by weight or less, more preferably 3.00% by weight or less, even more preferably 2.00% by weight or less, and particularly preferably 1.00% by weight or less, based on 100% by weight of the whitening inhibitor.
  • This configuration has the advantage that it can be suitably applied to food applications.
  • the lower limit of the amount of polymers with a molecular weight of 1000 or less in the whitening inhibitor is 0.00% by weight, i.e., the whitening inhibitor does not need to contain polymers with a molecular weight of 1000 or less.
  • the whitening inhibitor preferably has a lower content of polymer (A) having a molecular weight of 1000 or less.
  • the content of polymer (A) having a molecular weight of 1000 or less in the whitening inhibitor is not particularly limited, but is preferably 4.00% by weight or less, more preferably 3.00% by weight or less, even more preferably 2.00% by weight or less, and particularly preferably 1.00% by weight or less, based on 100% by weight of the whitening inhibitor.
  • This configuration has the advantage that it can be suitably applied to food applications.
  • the lower limit of the content of polymer (A) having a molecular weight of 1000 or less in the whitening inhibitor is 0.00% by weight, i.e., the whitening inhibitor does not need to contain polymer (A) having a molecular weight of 1000 or less.
  • the whitening inhibitor preferably contains less polymer (B) having a molecular weight of 1000 or less.
  • the content of polymer (B) having a molecular weight of 1000 or less in the whitening inhibitor is not particularly limited, but is preferably 4.00% by weight or less, more preferably 3.00% by weight or less, even more preferably 2.00% by weight or less, and particularly preferably 1.00% by weight or less, based on 100% by weight of the whitening inhibitor. This configuration has the advantage of being suitable for use in food products.
  • the lower limit of the content of polymer (B) having a molecular weight of 1000 or less in the whitening inhibitor is 0.00% by weight, i.e., the whitening inhibitor does not need to contain polymer (B) having a molecular weight of 1000 or less.
  • the content of the whitening inhibitor in the resin composition is not particularly limited.
  • the content of the whitening inhibitor in the resin composition is preferably 0.1% by weight to 10.0% by weight, based on 100% by weight of the resin composition.
  • the lower limit of the content is more preferably 0.2% by weight or more.
  • the upper limit of the content may be any of 8.0% by weight or less, 6.0% by weight or less, and 4.0% by weight or less. If the content of the whitening inhibitor in the resin composition is within the above range, there is an advantage in that a good balance is achieved between improving the melt viscosity and suppressing whitening.
  • the recycled polyester resin and the whitening inhibitor may react. More specifically, in the resin composition, the reactive functional group (e.g., epoxy group) of the reactive functional group-containing unit in the polymer (A) contained in the whitening inhibitor may react with the terminal functional group (e.g., hydroxyl group or carboxyl group) of the recycled polyester resin. As a result of such a reaction, a resin having a structural unit derived from the recycled polyester resin and a structural unit derived from the whitening inhibitor may be formed.
  • the reactive functional group e.g., epoxy group
  • the terminal functional group e.g., hydroxyl group or carboxyl group
  • the resin composition contains a recycled polyester resin and a whitening inhibitor” also includes cases where the recycled polyester resin and the whitening inhibitor are present in the resin composition as structural units derived from the recycled polyester resin and structural units derived from the whitening inhibitor, respectively.
  • the resin composition may or may not further contain a resin other than the recycled polyester resin.
  • the resin other than the recycled polyester resin is not particularly limited, but examples thereof include virgin polyester resin, polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyvinyl acetate, polyurethane, polytetrafluoroethylene, ABS resin, AS resin, acrylic resin, polyacetal, polycarbonate, modified polyphenylene ether, polyamide, and cyclic polyolefin.
  • the content of resins other than recycled polyester resin in the resin composition is not particularly limited, but may be, for example, 0 to 60 parts by weight per 100 parts by weight of recycled polyester resin.
  • the upper limit of the content may be 50 parts by weight or less, 40 parts by weight or less, 30 parts by weight or less, 20 parts by weight or less, 10 parts by weight or less, 5 parts by weight or less, or 1 part by weight or less.
  • the content of resins other than polyester-based resins including recycled polyester-based resins and virgin polyester-based resins is not particularly limited.
  • the content of resins other than polyester-based resins relative to 100 parts by weight of polyester-based resins, i.e., 100 parts by weight of the total amount of recycled polyester-based resins and virgin polyester-based resins may be 0 to 60 parts by weight.
  • the upper limit of the content may be any of 50 parts by weight or less, 40 parts by weight or less, 30 parts by weight or less, 20 parts by weight or less, 10 parts by weight or less, 5 parts by weight or less, and 1 part by weight or less.
  • the molded article may be molded using other additives.
  • the resin composition may contain other additives.
  • the other additives are not particularly limited, but may include, for example, a flame retardant, a flame retardant assistant, an anti-dripping agent, a reinforcing agent, a filler, an antioxidant, a pigment, a dye, a conductive agent, a hydrolysis inhibitor, a thickener, a plasticizer, a lubricant, an ultraviolet absorber, an antistatic agent, a flow improver, a release agent, a compatibilizer, and a heat stabilizer.
  • the method for producing the resin composition is not particularly limited, and a general method for producing a resin composition can be applied.
  • the raw materials e.g., recycled polyester resin and whitening inhibitor
  • a Henschel mixer or a tumbler mixer for example, a Henschel mixer or a tumbler mixer, and then the resulting mixture is melt-kneaded to obtain a resin composition.
  • a kneader such as a single-screw or twin-screw extruder, a Banbury mixer, a pressure kneader, or a mixing roll can be used.
  • a kneader such as a single-screw or twin-screw extruder, a Banbury mixer, a pressure kneader, or a mixing roll can be used.
  • a kneader such as a single-screw or twin-screw extruder, a Banbury mixer, a pressure kneader, or a mixing
  • the resin composition preferably has a high melt viscosity (IV value).
  • the method for measuring the melt viscosity (IV value) of the resin composition will be described in detail in the Examples below.
  • the melt flow rate (MFR) of the resin composition is preferably 3.7 g/10 min to 30.0 g/10 min, more preferably 3.7 g/10 min to 29.5 g/10 min, more preferably 3.7 g/10 min to 29.0 g/10 min, more preferably 3.7 g/10 min to 28.5 g/10 min, even more preferably 3.7 g/10 min to 28.0 g/10 min, and particularly preferably 3.7 g/10 min to 27.5 g/10 min.
  • the melt flow rate (MFR) of the resin composition is within the above-mentioned range, the molded article has the advantage of excellent strength.
  • the method for measuring the MFR of the resin composition will be described in detail in the examples below.
  • a technique called solid-state polymerization (SSP) is known as a method for improving the melt viscosity (IV value) of recycled polyester resins.
  • Molded bodies obtained by molding a resin composition obtained by solid-state polymerization using recycled polyester resin as a raw material have the advantage that they do not whiten at all, or even if they whiten, the degree of whitening is very small.
  • solid-state polymerization requires a huge amount of energy because it is carried out for a long time under vacuum and high temperature.
  • the haze of a solution obtained by dissolving a molded body obtained from a resin composition obtained by solid-state polymerization using recycled polyester resin as a raw material is, for example, about 1.0%.
  • the haze of a solution obtained by dissolving a molded body obtained from this resin composition is, for example, 1.50% or more. In other words, if the haze of the solution obtained by dissolving a molded body is 1.50% or more, the molded body can be considered not to be a molded body obtained from a resin composition obtained by solid-state polymerization. In one embodiment of the present invention, the haze of a solution obtained by dissolving a molded body may be 2.00% or more, 2.50% or more, or 3.00% or more.
  • the method for producing the molded body in other words, the molding method of the resin composition, is not particularly limited.
  • the method for producing the molded body can be, for example, injection molding, extrusion molding, blow molding, calendar molding, inflation molding, rotational molding, press molding, etc.
  • the blow molding method is preferred.
  • the molded body according to one embodiment of the present invention is preferably a molded body obtained by blow molding the present resin composition.
  • the blow molding method may be a molding method in which only blow molding is performed using a resin composition, or a molding method performed in combination with other molding methods (e.g., injection molding, extrusion molding, calendar molding, etc.).
  • a molding method performed in combination with other molding methods a two-step blow molding method is preferred.
  • the two-step blow molding method is a molding method in which a resin composition is injection molded to obtain an injection molded body in the first step, and then the injection molded body is blow molded in the second step.
  • the degree of whitening of the molded body can be evaluated by the difference ( ⁇ L) in the L value before and after tension of the film (molded body) obtained by molding the resin composition into a film. Specifically, the resin composition is molded into a film, and a tensile test is performed on the obtained film (molded body). The smaller the difference ( ⁇ L) in the L value before and after tension, the less the whitening of the molded body obtained using the resin composition is intended to be. For example, in the blow molding of a resin composition or an injection molded body, the resin composition or the injection molded body is molded while being stretched.
  • the stretching of the film (molded body) in the tensile test imitates the stretching during the blow molding of the resin composition or the injection molded body. Therefore, it can be said that the smaller the ⁇ L of the film (molded body), the less the whitening of the blow molded body (for example, a bottle-shaped molded body) obtained by blow molding.
  • ⁇ L is preferably 9.5 or less, more preferably 9.0 or less, more preferably 8.0 or less, more preferably 7.0 or less, even more preferably 6.0 or less, and particularly preferably 5.0 or less.
  • the lower limit There is no particular limit to the lower limit, and it is most preferably 0, but it may be 1.0, 1.5, or 2.0.
  • ⁇ L being in the above range means that whitening of the molded body is suppressed. The method for measuring ⁇ L of the film (molded body) will be explained in detail in the examples later.
  • the haze of the molded product is preferably 7.5 or less, more preferably 6.5 or less, more preferably 5.5 or less, even more preferably 5.0 or less, even more preferably 4.5 or less, and particularly preferably 4.0 or less.
  • the lower limit of the haze of the molded product is not particularly limited, and is, for example, 1.0.
  • a molded product having a haze in the above range means that the molded product has high transparency. The method for measuring the haze of the molded product will be described in detail in the Examples below.
  • the total light transmittance (TT) of the molded body is preferably 80.0% or more, more preferably 80.5% or more, more preferably 81.0% or more, more preferably 81.5% or more, even more preferably 82.0% or more, and particularly preferably 82.5% or more.
  • the upper limit of the total light transmittance (TT) of the molded body is not particularly limited, and is, for example, 100%.
  • the total light transmittance (TT) of the molded body in the above range means that the transparency of the molded body is high. The method for measuring the total light transmittance (TT) of the molded body will be described in detail in the Examples below.
  • the buckling strength of this molded product is preferably 200, more preferably 250, even more preferably 300, and particularly preferably 350. If the buckling strength of the molded product is within the above range, there is an advantage that the range of applications in which the molded product can be used is expanded. The method for measuring the buckling strength of the molded product will be described in detail in the Examples below.
  • the shape of the present molded product is not particularly limited. By using the resin composition and the various molding methods described above, molded products of various shapes can be obtained. Examples of the shape of the present molded product include a bottle shape, a sheet shape, a film shape, and a rod shape. Among these, the present molded product is preferably a bottle shape, more preferably a blow molded product (molded product) obtained by a blow molding method, and particularly preferably a bottle-shaped blow molded product (bottle-shaped molded product) obtained by blow molding.
  • One embodiment of the present invention provides a whitening inhibitor.
  • the melt viscosity of the resin composition is improved to a certain degree by mixing the matrix resin (e.g., polyester-based resin) with the viscosity modifier, but there is a problem that the molded body obtained by molding the resulting resin composition turns white.
  • the matrix resin e.g., polyester-based resin
  • the refractive index of the matrix resin and the refractive index of the polymer which is the main component of the viscosity modifier, as close to the same as possible.
  • the matrix resin is a polyester-based resin
  • the resin composition obtained in this way has a certain degree of transparency because the refractive index of the polyester-based resin is equal to the refractive index of the polymer.
  • the problem of the molded body turning white still exists.
  • An additional object of one embodiment of the present invention is to provide a novel whitening inhibitor for polyester resins that can provide a polyester resin composition capable of producing a molded article having excellent strength and reduced whitening.
  • a whitening inhibitor containing a polymer (A) obtained by polymerizing a monomer mixture (A) containing specific amounts of each of the components (a), (b), and (c), or a monomer mixture (A) containing specific amounts of each of the components (a) and (b), can provide a molded article with reduced whitening.
  • polyester resin composition capable of producing a molded article having excellent strength and reduced whitening, and a whitening inhibitor for polyester resins.
  • a whitening inhibitor for polyester resins comprises a polymer (A) obtained by polymerizing a monomer mixture (A) containing (a) 10% by weight to 60% by weight of an epoxy group-containing monomer and (b) 40% by weight to 90% by weight of a non-epoxy group-containing monomer.
  • the "whitening inhibitor for polyester resins” may be simply referred to as the "whitening inhibitor.”
  • the whitening inhibitor according to one embodiment of the present invention has the above-mentioned configuration, and therefore has the advantage of being able to provide a polyester resin composition that can provide a molded article with excellent strength and reduced whitening. It can also be said that the whitening inhibitor according to one embodiment of the present invention has the above-mentioned configuration, and therefore can provide a molded article with excellent strength and reduced whitening.
  • a polyester-based resin composition according to one embodiment of the present invention contains the whitening inhibitor according to one embodiment of the present invention described in the above section [2-1. Whitening inhibitor for polyester-based resin], i.e., the whitening inhibitor described in the above section (1-1-2. Whitening inhibitor), and a polyester-based resin.
  • the polyester resin composition according to one embodiment of the present invention has the above-mentioned configuration, and therefore has the advantage of being able to provide a molded article with excellent strength and reduced whitening.
  • the whitening inhibitor according to one embodiment of the present invention can react not only with recycled polyester resins as described above, but also with virgin polyester resins.
  • the reactive functional group (e.g., epoxy group) in the polymer (A) contained in the whitening inhibitor can react with the terminal functional group (e.g., hydroxyl group or carboxyl group) of the polyester resin. This reaction can elongate the molecular chain of the virgin polyester resin. That is, the whitening inhibitor according to one embodiment of the present invention can react with all polyester resins, regardless of whether they are recycled or virgin (unused), and can elongate the molecular chain of the polyester resin.
  • the melt viscosity of the polyester resin composition can be improved, the strength of a molded body made of the polyester resin composition can be increased, and (ii) whitening of a molded body containing a polyester resin can be suppressed.
  • polyester resins are not particularly limited, but include, for example, polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, polyethylene-2,6-naphthalate, polybutylene naphthalate, poly-1,4-cyclohexylene dimethylene terephthalate, polyethylene-1,2-bis(phenoxy)ethane-4,4'-dicarboxylate, polyethylene isophthalate/terephthalate, polybutylene terephthalate/isophthalate, polybutylene terephthalate/decane dicarboxylate, polycyclohexane dimethylene terephthalate/isophthalate, polyester/polyether, glycol-modified polyethylene terephthalate, etc.
  • Glycol-modified polyethylene terephthalate refers to a copolymer of terephthalic acid, ethylene glycol, and a glycol component other than ethylene glycol.
  • the polyester-based resin preferably contains one or more types selected from the group consisting of (i) polypropylene terephthalate, polybutylene terephthalate, polyethylene-2,6-naphthalate, polybutylene naphthalate, poly 1,4-cyclohexylene dimethylene terephthalate, and polyester/polyether, and may be composed of only one or more types selected from said group, and more preferably contains one or more types selected from the group consisting of (ii) polyethylene terephthalate and polybutylene terephthalate, and may be composed of only one or more types selected from said group.
  • polyester-based resin a polymer alloy obtained from a mixture of multiple polymers containing a polyester-based resin may be used.
  • the polymer alloy include polycarbonate/polyethylene terephthalate, polyethylene terephthalate/glycol-modified polyethylene terephthalate, and polyethylene terephthalate/copolymerized polyethylene terephthalate.
  • the polyester-based resin may contain one or more selected from the group consisting of polycarbonate/polyethylene terephthalate, polyethylene terephthalate/glycol-modified polyethylene terephthalate, and polyethylene terephthalate/copolymerized polyethylene terephthalate, or may be composed of only one or more selected from the group.
  • Copolymerized polyethylene terephthalate refers to a resin in which a component (third component) other than the components (two components) that constitute polyethylene terephthalate is copolymerized.
  • polyester-based resins other than those mentioned above are the same as those explained in the above section (1-1-1. Recycled polyester-based resins), so the description is incorporated herein and a detailed explanation is omitted here.
  • the aspects other than recycling can be regarded as aspects related to polyester-based resins and can be incorporated as appropriate.
  • the aspects explained as preferred aspects in the above section (1-1-1. Recycled polyester-based resins) are also preferred aspects in this section (2-2-1. Polyester-based resins).
  • recycled polyester resins tend to have a lower melt viscosity than unused products. Therefore, in the past, recycled polyester resins have tended to have limited uses for reuse due to their low melt viscosity.
  • a technology has been known in which, when using recycled polyester resins, a viscosity improver is added to the recycled polyester resin to improve the melt viscosity of a resin composition containing the recycled polyester resin to a certain extent.
  • molded bodies obtained from resin compositions containing conventional viscosity improvers have a problem of whitening. Therefore, due to the whitening of the resulting molded bodies, the uses for reuse of recycled polyester resins have tended to be limited.
  • the whitening inhibitor according to one embodiment of the present invention has the advantage that, by mixing with recycled polyester resins, the melt viscosity of the resulting resin composition can be improved and a molded body with reduced whitening can be provided. Therefore, one embodiment of the present invention has the advantage that it can greatly expand the uses of recycled polyester resins for reuse, and in particular, it can greatly contribute to the development of applications requiring strength and high transparency (e.g., alcoholic beverage bottles, beverage bottles, etc.).
  • one embodiment of the present invention can significantly reduce the amount of plastic waste generated and the amount of plastic used in production. As a result, one embodiment of the present invention can contribute to the achievement of the Sustainable Development Goals (SDGs), such as Goal 12 "Ensure sustainable consumption and production patterns.”
  • SDGs Sustainable Development Goals
  • the content of the whitening inhibitor is not particularly limited.
  • the content of the whitening inhibitor is preferably 0.1% by weight to 10.0% by weight, based on 100% by weight of the polyester resin composition.
  • the lower limit of the content is more preferably 0.2% by weight or more.
  • the upper limit of the content may be any of 8.0% by weight or less, 6.0% by weight or less, and 4.0% by weight or less. If the content of the whitening inhibitor in the polyester resin composition is within the above range, there is an advantage in that a good balance is achieved between improving the melt viscosity and suppressing whitening.
  • the polyester resin composition according to one embodiment of the present invention may be a master batch containing 10.0 to 90.0% by weight of a whitening inhibitor in 100% by weight of the resin composition. It can also be said that a polyester resin composition containing 10.0 to 90.0% by weight of a whitening inhibitor in 100% by weight of a polyester resin composition can be used as a master batch.
  • the content of the whitening inhibitor in the polyester resin composition is preferably 10.0 to 90.0% by weight in 100% by weight of the polyester resin composition.
  • the lower limit of the content is more preferably 20.0% by weight or more.
  • the upper limit of the content may be 80.0% by weight or less. If the content of the whitening inhibitor in the polyester resin composition is within the above range, there is an advantage that the dispersibility of the whitening inhibitor in the polyester resin is good when used as a master batch.
  • the method for producing the masterbatch is not particularly limited, and examples include the melt-kneading method and the dry blending method, with the melt-kneading method being particularly preferred.
  • the polyester resin composition according to one embodiment of the present invention may or may not further contain a resin other than the polyester resin.
  • Specific examples of the resin other than the polyester resin are the same as those described in the above section (1-1-3. Other resins), and therefore the description is incorporated herein by reference and will not be repeated here.
  • the content of resins other than polyester resins in a polyester resin composition according to one embodiment of the present invention is not particularly limited, but may be, for example, 0 to 60 parts by weight per 100 parts by weight of polyester resin.
  • the upper limit of the content may be 50 parts by weight or less, 40 parts by weight or less, 30 parts by weight or less, 20 parts by weight or less, 10 parts by weight or less, 5 parts by weight or less, or 1 part by weight or less.
  • polyester resin composition according to one embodiment of the present invention may contain other additives.
  • Specific examples of the other additives are the same as those described in the above section (1-1-4. Other additives), so the description is incorporated herein by reference and will not be repeated here.
  • the method for producing the polyester resin composition according to one embodiment of the present invention is not particularly limited, and a general method for producing a resin composition can be applied.
  • a general method for producing a resin composition can be applied.
  • the method described in the above section (1-1-5. Method for producing a resin composition) can be adopted, except that a polyester resin (recycled polyester resin and/or virgin polyester resin) is used instead of a recycled polyester resin.
  • the whitening inhibitor according to one embodiment of the present invention can provide a polyester-based resin composition capable of providing a molded article having excellent strength and reduced whitening. Also, the polyester-based resin composition according to one embodiment of the present invention (a resin composition containing the whitening inhibitor according to one embodiment of the present invention and a polyester-based resin) can provide a molded article having excellent strength and reduced whitening.
  • the whitening inhibitor according to one embodiment of the present invention can provide a resin composition having a higher melt viscosity (IV value) than a resin or resin composition that does not contain the whitening inhibitor and/or a resin composition that contains a conventional viscosity improver.
  • the polyester-based resin composition according to one embodiment of the present invention has the advantage of having a higher melt viscosity (IV value) than a resin or resin composition that does not contain the whitening inhibitor according to one embodiment of the present invention and/or a resin composition that contains a conventional viscosity improver. The method for measuring the melt viscosity (IV value) of the polyester-based resin composition will be described in detail in the Examples below.
  • the whitening inhibitor according to one embodiment of the present invention can provide a resin composition having a smaller MFR than a resin or resin composition that does not contain the whitening inhibitor and/or a resin composition that contains a conventional viscosity modifier.
  • the polyester-based resin composition according to one embodiment of the present invention has the advantage of having a smaller MFR than a resin or resin composition that does not contain the whitening inhibitor according to one embodiment of the present invention and/or a resin composition that contains a conventional viscosity modifier. The method for measuring the MFR of a polyester-based resin composition will be described in detail in the Examples below.
  • the molded article according to one embodiment of the present invention is a molded article obtained by molding the polyester resin composition according to one embodiment of the present invention described in the above section [2-2. Polyester resin composition].
  • the molded article according to one embodiment of the present invention can also be said to be a molded article containing the polyester resin composition according to one embodiment of the present invention described in the above section [2-2. Polyester resin composition].
  • the molded article according to one embodiment of the present invention has the above-mentioned configuration, and therefore has the advantages of excellent strength and reduced whitening.
  • the manufacturing method of the molded article according to one embodiment of the present invention in other words, the molding method of the polyester resin composition according to one embodiment of the present invention, is not particularly limited.
  • the manufacturing method of the molded article may be the same as the manufacturing method described in the above section [1-2. Manufacturing method of the molded article]. Therefore, the description in the above section [1-2. Manufacturing method of the molded article] is incorporated by reference, and the description is omitted here.
  • the molded article according to one embodiment of the present invention is preferably a molded article obtained by blow molding the polyester resin composition according to one embodiment of the present invention described in the above section [2-2. Polyester resin composition].
  • the degree of whitening of the molded body can be evaluated by the difference ( ⁇ L) in the L value before and after tension of the film (molded body) obtained by molding the resin composition into a film. Specifically, the resin composition is molded into a film, and a tensile test is performed on the obtained film (molded body). The smaller the difference ( ⁇ L) in the L value before and after tension, the more the resin composition can provide a molded body with reduced whitening. For example, in the blow molding of a resin composition or an injection molded body, the resin composition or the injection molded body is molded while being stretched.
  • the film (molded body) according to one embodiment of the present invention has the advantage that ⁇ L is smaller than that of a film (molded body) obtained from a resin composition containing a conventional viscosity improver.
  • the present whitening inhibitor and the present resin composition have the advantage that they can provide a film (molded article) with a smaller ⁇ L, as compared with resin compositions containing conventional viscosity improvers.
  • ⁇ L it is the same as that explained in the above section [1-3. Physical properties of molded body], so the explanation will be omitted here by referring to that description.
  • the preferred numerical range for ⁇ L explained in the above section [1-3. Physical properties of molded body] can also be said to be the preferred numerical range for ⁇ L in this section (2-3-2. Physical properties of molded body).
  • the haze, total light transmittance (TT) and bending strength of the molded body according to one embodiment of the present invention are the same as those described above in section [1-3. Physical properties of molded body], so the description is incorporated herein and will not be repeated here.
  • the preferred numerical ranges for the haze, total light transmittance (TT) and bending strength of the molded body described above in section [1-3. Physical properties of molded body] can also be said to be the preferred numerical ranges for the haze, total light transmittance (TT) and bending strength of the molded body in this section (2-3-2. Physical properties of molded body).
  • the shape of the molded body according to one embodiment of the present invention is not particularly limited.
  • the shape of the molded body according to one embodiment of the present invention may be, for example, any of the shapes described in the above section [1-4. Shape of the molded body]. Therefore, the description in the above section [1-4. Shape of the molded body] can be appropriately applied to the shape of the molded body according to one embodiment of the present invention.
  • the embodiment described as a preferred embodiment in the above section [1-4. Shape of the molded body] is also a preferred embodiment in this section (2-3-3. Shape of the molded body).
  • One embodiment of the present invention provides a method for producing a recycled polyester resin composition.
  • polyester resins have melt viscosity decreases each time they are recycled, resulting in a deterioration in strength.
  • Solid-state polymerization (sometimes referred to as "SSP" in this specification), a technology known to increase the melt viscosity of polyester resins, requires long periods of time under high temperature and reduced pressure (vacuum), consuming a large amount of power, and thus creating problems with environmental impact and production costs.
  • the melt viscosity of the resin composition is increased to a certain degree by mixing the matrix resin (polyester resin) with the viscosity modifier, but there is a problem that the molded body obtained by molding the resulting resin composition turns white.
  • a conventional viscosity modifier which is known as another technique for increasing the melt viscosity of polyester resins
  • the melt viscosity of the resin composition is increased to a certain degree by mixing the matrix resin (polyester resin) with the viscosity modifier, but there is a problem that the molded body obtained by molding the resulting resin composition turns white.
  • efforts have been made to make the refractive index of the matrix resin and the refractive index of the polymer, which is the main component of the viscosity modifier, as close to the same as possible.
  • the matrix resin is a polyester resin
  • the resin composition obtained in this way has a certain degree of transparency because the refractive index of the polyester resin is equivalent to the refractive index of the polymer.
  • the problem of the molded body turning white still exists.
  • An additional objective of one embodiment of the present invention is to provide a new method for producing recycled polyester resin compositions that utilizes SSP while reducing the environmental impact and production costs.
  • the present inventors have conducted intensive research, without being limited by the refractive index, in order to obtain a molded product with reduced whitening.
  • the present inventors have independently obtained the novel knowledge that, surprisingly, a whitening inhibitor containing a polymer (A) according to one embodiment of the present invention obtained by polymerizing a monomer mixture (A) containing specific amounts of each of the components (a), (b), and (c), or a monomer mixture (A) containing specific amounts of each of the components (a) and (b), can provide a molded product with reduced whitening.
  • SSP was performed using pellets obtained by melt-kneading such a whitening inhibitor and a polyester resin
  • the inventors have obtained the knowledge that the time required to increase the melt viscosity to a target value can be significantly shortened.
  • a method for producing a recycled polyester-based resin composition according to one embodiment of the present invention includes the steps of melt-kneading a whitening inhibitor for polyester-based resin and a polyester-based resin to prepare pellets containing the whitening inhibitor for polyester-based resin and the polyester-based resin, and performing solid-state polymerization using the pellets.
  • the whitening inhibitor for polyester-based resin includes a polymer (A) obtained by polymerizing a monomer mixture (A) containing (a) 10 parts by weight to 60 parts by weight of an epoxy group-containing monomer, and (b) 40 parts by weight to 90 parts by weight of an epoxy group-free monomer.
  • step I the "step of melt-kneading a whitening inhibitor for polyester-based resins and a polyester-based resin to prepare pellets containing the whitening inhibitor for polyester-based resins and the polyester-based resin”
  • step II the "step of carrying out solid-state polymerization using the pellets”
  • step II the "whitening inhibitor for polyester-based resins”
  • the "pellets containing the whitening inhibitor for polyester-based resins and the polyester-based resin” may be referred to simply as the "pellets.”
  • the whitening inhibitor comprises a polymer (A) obtained by polymerizing a monomer mixture (A) comprising (a) 10% by weight to 60% by weight of an epoxy group-containing monomer, and (b) 40% by weight to 90% by weight of a non-epoxy group-containing monomer.
  • the whitening inhibitor has the above-mentioned configuration, and thus has the advantage that, by melt-kneading with a polyester-based resin, the melt viscosity of the polyester-based resin is increased, thereby providing pellets that can provide molded bodies with excellent strength and reduced whitening. Therefore, in an SSP using pellets with increased melt viscosity, the time required to increase the melt viscosity to the target value can be shortened. It can also be said that, because the whitening inhibitor has the above-mentioned configuration, it is possible to provide molded bodies with excellent strength and reduced whitening.
  • the reactive functional group (e.g., epoxy group) in the polymer (A) contained in the whitening inhibitor can react with the terminal functional group (e.g., hydroxyl group or carboxyl group) of the polyester resin.
  • This reaction can elongate the molecular chain of the polyester resin; this mechanism increases the melt viscosity of the pellet. Since the melt viscosity of the pellet is increased, the time required to increase the melt viscosity to the target value in SSP using the pellet can be shortened.
  • the whitening inhibitor contains the aforementioned polymer (A), the dispersibility of the whitening inhibitor in the pellet and in the recycled polyester resin composition after SSP can be improved. It is presumed that this suppresses the whitening of the molded body. Note that the present invention is not limited to these mechanisms and presumptions.
  • the content of component (a) (epoxy group-containing monomer (a)) in monomer mixture (A) is not particularly limited, but is preferably 10% to 60% by weight out of 100% by weight of monomer mixture (A).
  • the upper limit of the content may be 55%, 50%, 45%, or 40% by weight, and the lower limit of the content may be 15%, 20%, 25%, or 30% by weight. If the content of component (a) is within the above range, the effect of improving the melt viscosity of the pellets can be good. As a result, in SSP using the pellets, the time required to increase the melt viscosity to the target value can be shortened. Furthermore, the molded article obtained using the recycled polyester resin composition obtained after SSP has the advantage of being superior in strength.
  • the content of component (b) (epoxy group-free monomer (b)) in monomer mixture (A) is not particularly limited, but is preferably 40% to 90% by weight out of 100% by weight of monomer mixture (A).
  • the upper limit of the content may be 85%, 80%, 75%, or 70% by weight, and the lower limit of the content may be 45%, 50%, 55%, or 60% by weight. If the content of component (b) is within the above range, there is an advantage that the dispersibility of the whitening inhibitor in the pellets and in the recycled polyester resin composition after SSP can be improved. As a result, there is also an advantage that whitening of the obtained molded body is further suppressed.
  • polyester resin Specific examples of polyester resins are the same as those described above in (2-2-1. Polyester resins), and therefore the description is incorporated herein by reference and will not be repeated here. The specific examples described as preferred specific examples in (2-2-1. Polyester resins) above are also preferred specific examples in this (3-1-1-2. Polyester resins).
  • polyester-based resins other than the specific examples of polyester-based resins may be the same as those described in the above section (1-1-1.
  • Recycled polyester-based resins so that description will be used and a description will be omitted here.
  • aspects other than being recycled can be regarded as aspects of polyester-based resins and can be used as appropriate.
  • Recycled polyester-based resins can also be preferred aspects in this section (3-1-1-2. Polyester-based resins).
  • the polyester resin preferably contains the following (i), (ii) and/or (iii): (i) A polyester resin composition and/or a molded article that has once been manufactured into a product and then used and/or discarded, (ii) Waste polyester resin compositions and/or waste molded articles discharged during the production process of polyester resin compositions and/or molded articles, (iii) A polyester resin obtained by recycling the above (i) and (ii).
  • Examples of (i) include crushed materials (flakes, etc.) obtained by recovering, washing and crushing used and/or discarded polyester resin compositions and/or molded bodies.
  • Examples of (iii) include polyester resin compositions and/or molded articles produced by material recycling using (i) and/or (ii) as raw materials.
  • one embodiment of the present invention can significantly reduce the amount of plastic waste generated and the amount of plastic used in production. As a result, one embodiment of the present invention can contribute to the achievement of the Sustainable Development Goals (SDGs), such as Goal 12 "Ensure sustainable consumption and production patterns.”
  • SDGs Sustainable Development Goals
  • polyester resins that have never been commercialized may be referred to as "virgin polyester resins" in this specification.
  • the polyester resins used also include mixtures of "virgin polyester resins" with the above-mentioned (i), (ii) and/or (iii).
  • polyester resin (iii) may itself be a resin whose melt viscosity has already been reduced. For this reason, conventionally, recycled polyester resins have tended to have limited applications due to their low melt viscosity.
  • step I the polyester resin is mixed with the whitening inhibitor to prepare pellets that have an increased melt viscosity and reduce whitening when the resulting recycled polyester resin composition is molded into a molded product. Then, by using such pellets to carry out SSP in step II, the time required to increase the melt viscosity to the target value can be shortened, reducing the environmental burden and production costs, and a recycled polyester resin with a high melt viscosity can be produced.
  • one embodiment of the present invention has the advantage that it can greatly expand the applications of recycled polyester resins, and in particular, it can greatly contribute to their expansion into applications that require strength and high transparency (e.g., alcoholic beverage bottles, beverage bottles, etc.).
  • step I the whitening inhibitor for polyester-based resins and the polyester-based resin are melt-kneaded to prepare pellets containing the whitening inhibitor for polyester-based resins and the polyester-based resin.
  • the content of the whitening inhibitor is not particularly limited, but is preferably 0.1 to 10.0% by weight, based on 100% by weight of the pellets.
  • the lower limit of the content is more preferably 0.2% by weight or more.
  • the upper limit of the content may be any of 8.0% by weight or less, 6.0% by weight or less, and 4.0% by weight or less. If the content of the whitening inhibitor in the pellets is within the above range, there is an advantage in that a good balance is achieved between improving the melt viscosity and suppressing whitening.
  • a master batch may be used that contains preferably 10.0 to 90.0% by weight of the whitening inhibitor based on 100% by weight of the polyester resin composition.
  • the lower limit of the content of the whitening inhibitor in the master batch is more preferably 20.0% by weight or more based on 100% by weight of the polyester resin composition.
  • the upper limit of the content may be 80.0% by weight or less. If the content of the whitening inhibitor in the master batch is within the above range, there is an advantage that the dispersibility of the whitening inhibitor in the polyester resin is good.
  • the method for producing the masterbatch is not particularly limited, and examples include the melt-kneading method and the dry blending method, with the melt-kneading method being particularly preferred.
  • a resin other than a polyester-based resin may be further contained.
  • resins other than polyester-based resins are the same as those described above in (1-1-3. Other resins), so the description is incorporated herein by reference and will not be repeated here.
  • the content of resins other than polyester resin in the pellets obtained in step I is not particularly limited, but may be, for example, 0 to 60 parts by weight per 100 parts by weight of polyester resin.
  • the upper limit of the content may be 50 parts by weight or less, 40 parts by weight or less, 30 parts by weight or less, 20 parts by weight or less, 10 parts by weight or less, 5 parts by weight or less, or 1 part by weight or less.
  • step I other additives may be added. Specific examples of other additives are the same as those explained in the above section (1-1-4. Other additives), so the explanation is omitted here by referencing that description.
  • the method for melt-kneading the whitening inhibitor and polyester resin is not particularly limited, and a general method for producing a resin composition can be applied.
  • the polyester resin and the whitening inhibitor are mixed using a Henschel mixer or a tumbler mixer, and then the resulting mixture is melt-kneaded to obtain a polyester resin composition.
  • a kneading machine such as a single-screw or twin-screw extruder, a Banbury mixer, a pressure kneader, or a mixing roll can be used. Pellets can be produced by such melt-kneading.
  • the whitening inhibitor can provide pellets with a higher melt viscosity (IV value) than pellets not containing the whitening inhibitor and/or pellets containing a conventional viscosity improver.
  • the method for measuring the melt viscosity (IV value) of the resin composition will be described in detail in the Examples below.
  • the whitening inhibitor can provide a recycled polyester resin composition with a smaller MFR than when the whitening inhibitor is not included and/or when a conventional viscosity improver is included.
  • the method for measuring the MFR of the resin composition will be described in detail in the Examples below.
  • Step II is a step of carrying out solid-state polymerization using the pellets prepared in step I.
  • the method of solid-state polymerization is not particularly limited, and a reactor and reaction conditions suitable for solid-state polymerization can be appropriately selected.
  • Step II may include, for example, a crystallization step in which the pellets are dried and crystallized, a heating step in which the crystallized pellets are further heated, and a polymerization step in which solid-state polymerization is performed.
  • the crystallization process is a process in which the pellets are dried and crystallized, for example, by heating the pellets to 120°C to 150°C under a specified pressure.
  • drying and crystallization There is no particular limit to the order of drying and crystallization, and either may be performed first, or drying and crystallization may be performed simultaneously.
  • drying and crystallization when drying and crystallization are performed simultaneously, the entire drying process and the entire crystallization process may be performed simultaneously, or one of them may be started and/or finished first.
  • There is also no particular limit to the time for which drying and crystallization are performed and it is, for example, 1.0 hour to 5.0 hours.
  • the temperature-raising process is a process in which the crystallized pellets are further heated.
  • the temperature-raising process is preferably carried out under a predetermined pressure, for example.
  • the temperature-raising process is preferably carried out by raising the temperature of the pellets to a temperature of, for example, 150°C to 230°C.
  • a temperature of, for example, 150°C to 230°C There are no particular limitations on the time from the start to the end of the temperature-raising process, and it is, for example, 1.0 hour to 5.0 hours.
  • gas can be removed.
  • Solid-state polymerization is preferably carried out under a specified pressure in an inert gas such as nitrogen gas.
  • Solid-state polymerization is usually preferably carried out at a temperature within the range of 200°C to 250°C, and more preferably at a temperature within the range of 220°C to 240°C.
  • Step II may further include a preheating step of preheating the pellets prior to the crystallization step.
  • the content of the whitening inhibitor is not particularly limited, but is preferably 0.1 to 10.0% by weight, based on 100% by weight of the recycled polyester resin composition.
  • the lower limit is more preferably 0.2% by weight or more.
  • the upper limit may be any of 8.0% by weight or less, 6.0% by weight or less, and 4.0% by weight or less. If the content of the whitening inhibitor in the pellets is within the above range, there is an advantage in that a good balance is achieved between improving the melt viscosity and suppressing whitening.
  • the MFR of the recycled polyester resin composition is preferably 3.7 to 30.0, more preferably 5.0 to 25.0, and even more preferably 10.0 to 20.0.
  • the method for producing a molded article according to one embodiment of the present invention includes a step of molding a recycled polyester resin composition obtained by the method described in the above section [3-1. Method for producing recycled polyester resin composition].
  • the method for producing a molded body according to one embodiment of the present invention has the above-mentioned configuration, and therefore has the advantage of being able to produce a molded body with excellent strength and reduced whitening.
  • the molding method is not particularly limited, and may be, for example, the same as the manufacturing method described in the above section [1-2. Manufacturing method of molded body]. Therefore, the description in the above section [1-2. Manufacturing method of molded body] is incorporated herein by reference, and a detailed explanation is omitted here.
  • the molding step is preferably a blow molding step.
  • the degree of whitening of the molded body obtained by the manufacturing method of the molded body according to one embodiment of the present invention can be evaluated by the difference ( ⁇ L) in the L value before and after tension of the film (molded body) obtained by molding the recycled polyester resin composition into a film.
  • the recycled polyester resin composition is molded into a film, and a tensile test is performed on the obtained film (molded body).
  • the resin composition or the injection molded body is molded while being stretched.
  • the film (molded body) according to one embodiment of the present invention has the advantage that ⁇ L is smaller than that of a film (molded body) obtained from a conventional recycled polyester resin composition containing a viscosity improver.
  • the whitening inhibitor and the recycled polyester resin composition have the advantage that a film (molded article) having a smaller ⁇ L can be provided compared to a resin composition containing a conventional viscosity improver.
  • ⁇ L it is the same as that explained in the above section [1-3. Physical properties of molded body], so the explanation will be omitted here by referring to that description.
  • the preferred numerical range for ⁇ L explained in the above section [1-3. Physical properties of molded body] can also be said to be the preferred numerical range for ⁇ L in this section [3-3. Physical properties of molded body].
  • the haze, total light transmittance (TT) and bending strength of the molded body obtained by the molded body manufacturing method according to one embodiment of the present invention are the same as those described in the above section [1-3. Physical properties of molded body], and therefore the description is hereby incorporated by reference and will not be repeated here.
  • the preferred numerical ranges for the haze, total light transmittance (TT) and bending strength of the molded body described in the above section [1-3. Physical properties of molded body] can also be said to be the preferred numerical ranges for the haze, total light transmittance (TT) and bending strength of the molded body in this section [3-3. Physical properties of molded body].
  • the shape of the molded body according to one embodiment of the present invention is not particularly limited.
  • the shape of the molded body according to one embodiment of the present invention may be, for example, any of the shapes described in the above section [1-4. Shape of the molded body]. Therefore, the description in the above section [1-4. Shape of the molded body] can be used as appropriate for the shape of the molded body according to one embodiment of the present invention.
  • the aspects described as preferred aspects in the above section [1-4. Shape of the molded body] are also preferred aspects in this section (2-3-3. Shape of the molded body).
  • a method for producing a molded product according to one embodiment of the present invention includes a step of preparing a recycled polyester resin composition and a step of molding the recycled polyester resin composition.
  • the step of preparing the recycled polyester resin composition includes a step of melt-kneading a whitening inhibitor for polyester resin and a polyester resin to prepare pellets containing the whitening inhibitor for polyester resin and the polyester resin, and a step of performing solid-phase polymerization using the pellets.
  • the whitening inhibitor for polyester resin includes a polymer (A) obtained by polymerizing a monomer mixture (A) containing (a) 10 parts by weight to 60 parts by weight of an epoxy group-containing monomer, and (b) 40 parts by weight to 90 parts by weight of an epoxy group-free monomer.
  • the method for producing a molded body according to one embodiment of the present invention has the above-mentioned configuration, and therefore has the advantage of being able to provide a molded body that has excellent strength and reduced whitening.
  • the recycled polyester resin composition used in the method for producing a molded article according to one embodiment of the present invention may be a resin composition containing a recycled polyester resin, for example, the resin composition described in the above section [1-1. Resin composition].
  • the recycled polyester resin composition used in the method for producing a molded article according to one embodiment of the present invention may be a recycled polyester resin composition obtained by the method for producing the molded article according to the above section [3. Method for producing a recycled polyester resin composition]. Therefore, the description in the above section [1-1. Resin composition] and the description in the above section [3.
  • Method for producing a recycled polyester resin composition can be appropriately used for specific aspects of the recycled polyester resin composition used in the method for producing a molded article according to one embodiment of the present invention.
  • the aspects described as preferred aspects in the above section [1-1. Resin composition] and the above section [3. Method for producing a recycled polyester resin composition] may also be preferred aspects in this section (4-1. Recycled polyester resin composition).
  • the whitening inhibitor used in the method for producing a molded body according to one embodiment of the present invention may be (i) a whitening inhibitor described in the above section (1-1-2. Whitening inhibitor), (ii) a whitening inhibitor described in the above section (2. Whitening inhibitor), or (iii) a whitening inhibitor described in the above section (3-1-1-1. Whitening inhibitor). Therefore, for specific aspects of the whitening inhibitor used in the method for producing a molded body according to one embodiment of the present invention, the descriptions in the above section (1-1-2. Whitening inhibitor), the description in the above section (2. Whitening inhibitor), and the description in the above section (3-1-1-1. Whitening inhibitor) can be appropriately used.
  • the aspects described as preferred aspects in the above section (1-1-2. Whitening inhibitor), the above section (2. Whitening inhibitor), and the above section (3-1-1-1. Whitening inhibitor) may also be preferred aspects in this section (4-2. Whitening inhibitor).
  • the method for producing a molded article according to one embodiment of the present invention includes a step of preparing a recycled polyester resin composition.
  • the step of preparing a recycled polyester resin composition may include, for example, the method for producing a recycled polyester resin composition according to one embodiment of the present invention described in the above section [3. Method for producing a recycled polyester resin composition] as one step. Therefore, for specific aspects of the step of preparing a recycled polyester resin composition in the method for producing a molded article according to one embodiment of the present invention, the description in the above section [3. Method for producing a recycled polyester resin composition] can be appropriately used. The aspects described as preferred aspects in the above section [3. Method for producing a recycled polyester resin composition] may also be preferred aspects in this section (4-2. Step of preparing a recycled polyester resin composition).
  • the process for preparing the recycled polyester resin composition includes the steps of melt-kneading a whitening inhibitor for polyester resin and a polyester resin to prepare pellets containing the whitening inhibitor for polyester resin and the polyester resin, and carrying out solid-state polymerization using the pellets.
  • the "step of melt-kneading a whitening inhibitor for polyester-based resins and a polyester-based resin to prepare pellets containing the whitening inhibitor for polyester-based resins and the polyester-based resin” may be, for example, the step I described in the above section (3-1-1. Step I). Therefore, the description in the above section (3-1-1. Step I) can be used as appropriate for specific aspects of the "step of melt-kneading a whitening inhibitor for polyester-based resins and a polyester-based resin to prepare pellets containing the whitening inhibitor for polyester-based resins and the polyester-based resin" in the manufacturing method for molded bodies according to one embodiment of the present invention.
  • Step I) may also be preferred aspects of the "step of melt-kneading a whitening inhibitor for polyester-based resins and a polyester-based resin to prepare pellets containing the whitening inhibitor for polyester-based resins and the polyester-based resin" in the manufacturing method for molded bodies according to one embodiment of the present invention.
  • the "step of carrying out solid-state polymerization using the pellets” may be, for example, step II described in the above section (3-1-2. Step II). Therefore, for specific aspects of the "step of carrying out solid-state polymerization using the pellets" in the method for producing a molded body according to one embodiment of the present invention, the description in the above section (3-1-2. Step II) can be used as appropriate.
  • the aspects described as preferred aspects in the above section (3-1-2. Step II) may also be preferred aspects of the "step of carrying out solid-state polymerization using the pellets" in the method for producing a molded body according to one embodiment of the present invention.
  • the method of molding the recycled polyester resin composition is not particularly limited.
  • the manufacturing method described in the above [1-2. Manufacturing method of a molded article] can be adopted as the method of molding the recycled polyester resin composition, in other words, the manufacturing method of a molded article. Therefore, for specific aspects related to the "step of molding the recycled polyester resin composition" in the manufacturing method of a molded article according to one embodiment of the present invention, the description in the above [1-2. Manufacturing method of a molded article] can be appropriately used.
  • the aspects described as preferred aspects in the above [1-2. Manufacturing method of a molded article] can also be preferred aspects in the "step of molding the recycled polyester resin composition" in the manufacturing method of a molded article according to one embodiment of the present invention.
  • One embodiment of the present invention may have the following configuration.
  • the haze of the solution of the molded body is a value measured by carrying out the following steps (1) and (2) in this order: (1) dissolving the resin composition in hexafluoro-2-propanol to obtain a solution having a concentration of the resin composition of 0.05 g/mL; (2) Using a haze meter zero-adjusted with the hexafluoro-2-propanol, measure the haze of the resulting solution of the molded body;
  • the haze of the molded article is a value obtained by measurement using a haze meter.
  • the total light transmittance (TT) of the molded article is a value obtained by measurement using a haze meter.
  • the recycled polyester resin includes at least one selected from the group consisting of recycled [polycarbonate/polyethylene terephthalate], recycled [polyethylene terephthalate/glycol-modified polyethylene terephthalate], and recycled [polyethylene terephthalate/copolymerized polyethylene terephthalate].
  • the whitening inhibitor for polyester resins further comprises a polymer (B),
  • the composite comprising the polymer (A) and the polymer (B) has a core-shell structure in which the polymer (A) forms a core and the polymer (B) forms a shell,
  • the molded body according to any one of [6] to [11], wherein the ratio of the weight of the polymer (A) to the weight of the polymer (B) in the composite (weight of the polymer (A)/weight of the polymer (B)) is 20/80 to 80/20.
  • the number average molecular weight of the polymer (A) is 2,000 to 5,000
  • the molded article according to [12] wherein the number average molecular weight of the polymer (B) is 3,000 to 6,000.
  • a whitening inhibitor for polyester resins comprising a polymer (A) obtained by polymerizing a monomer mixture (A) comprising: (a) 10% by weight to 60% by weight of an epoxy group-containing monomer; and (b) 40% by weight to 90% by weight of an epoxy group-free monomer.
  • a step of preparing a recycled polyester resin composition; and a step of molding the recycled polyester resin composition includes: A step of melt-kneading a whitening inhibitor for polyester-based resins and a polyester-based resin to prepare pellets containing the whitening inhibitor for polyester-based resins and the polyester-based resin; and performing solid state polymerization using the pellets,
  • the whitening inhibitor for polyester resins is A method for producing a molded article comprising a polymer (A) obtained by polymerizing a monomer mixture (A) comprising: (a) 10 parts by weight to 60 parts by weight of an epoxy group-containing monomer; and (b) 40 parts by weight to 90 parts by weight of an epoxy group-free monomer.
  • One embodiment of the present invention may have the following configuration.
  • a whitening inhibitor for polyester resins comprising a polymer (A) obtained by polymerizing a monomer mixture (A) containing (a) 10% to 60% by weight of an epoxy group-containing monomer, and (b) 40% to 90% by weight of an epoxy group-free monomer.
  • [A4] A whitening inhibitor for polyester resins according to any one of [A1] to [A3], wherein the number average molecular weight of the polymer (A) is 2,000 to 6,000.
  • the whitening inhibitor for polyester resins described in any one of [A1] to [A5] does not contain the polymer (A) having a number average molecular weight of 1000 or less, or contains 4.00% by weight or less of the polymer (A) having a number average molecular weight of 1000 or less, based on 100% by weight of the whitening inhibitor for polyester resins.
  • the whitening inhibitor for polyester resins described in any one of [A1] to [A6] further contains a polymer (B), the composite consisting of the polymer (A) and the polymer (B) has a core-shell structure in which the polymer (A) forms the core and the polymer (B) forms the shell, and the ratio of the weight of the polymer (A) to the weight of the polymer (B) in the composite (weight of the polymer (A)/weight of the polymer (B)) is 20/80 to 80/20.
  • a polyester resin composition comprising a polyester resin and a whitening inhibitor for polyester resins described in any one of [A1] to [A8].
  • the polyester resin composition described in [A9] contains 0.1% by weight to 10.0% by weight of the whitening inhibitor for polyester resins, based on 100% by weight of the polyester resin composition.
  • the polyester resin composition described in [A9] contains 10.0% by weight to 90.0% by weight of the polyester resin whitening inhibitor in 100% by weight of the polyester resin composition, and is a master batch.
  • polyester resin composition according to any one of [A9] to [A12], wherein the polyester resin comprises at least one selected from the group consisting of polycarbonate/polyethylene terephthalate, polyethylene terephthalate/glycol-modified polyethylene terephthalate, and polyethylene terephthalate/copolymerized polyethylene terephthalate.
  • [A15] A molded article obtained by blow molding a polyester resin composition described in any one of [A9] to [A13].
  • One embodiment of the present invention may have the following configuration.
  • the whitening inhibitor for polyester resins is A method for producing a recycled polyester resin composition, comprising: a polymer (A) obtained by polymerizing a monomer mixture (A) comprising: (a) 10 parts by weight to 60 parts by weight of an epoxy group-containing monomer; and (b) 40 parts by weight to 90 parts by weight of an epoxy group-free monomer.
  • [B6] The method for producing the polyester resin whitening inhibitor according to any one of [B1] to [B5], wherein the polyester resin whitening inhibitor does not contain the polymer (A) having a number average molecular weight of 1000 or less, or contains 4.00% by weight or less of the polymer (A) having a number average molecular weight of 1000 or less, based on 100% by weight of the polyester resin whitening inhibitor.
  • the whitening inhibitor for polyester resins further comprises a polymer (B),
  • the composite comprising the polymer (A) and the polymer (B) has a core-shell structure in which the polymer (A) forms a core and the polymer (B) forms a shell,
  • the method according to any one of [B1] to [B6], wherein a ratio of a weight of the polymer (A) to a weight of the polymer (B) in the composite (weight of the polymer (A)/weight of the polymer (B)) is 20/80 to 80/20.
  • polyester resin comprises at least one selected from the group consisting of polycarbonate/polyethylene terephthalate, polyethylene terephthalate/glycol-modified polyethylene terephthalate, and polyethylene terephthalate/copolymerized polyethylene terephthalate.
  • [B12] A method for producing a molded product, comprising a step of molding the recycled polyester resin composition obtained by the method described in any one of [B1] to [B11].
  • One embodiment of the present invention may have the following configuration.
  • the haze of the solution of the molded body is 1.50% or more,
  • the haze of the molded body is 7.5 or less.
  • the haze of the solution of the molded body is a value measured by carrying out the following steps (1) and (2) in this order: (1) dissolving the resin composition in hexafluoro-2-propanol to obtain a solution having a concentration of the resin composition of 0.05 g/mL; (2) Using a haze meter zero-adjusted with the hexafluoro-2-propanol, measure the haze of the resulting solution of the molded body;
  • the haze of the molded article is a value obtained by measurement using a haze meter.
  • [C2] The molded product according to [C1], wherein the melt flow rate (MFR) of the resin composition is 3.7 g/10 min to 30.0 g/10 min.
  • MFR melt flow rate
  • the MFR is a value determined by measurement in accordance with JIS K 7210-1 under conditions of drying at 130° C. for 8 hours, a temperature of 270° C., and a load of 2.16 kg.
  • [C4] The molded body according to any one of [C1] to [C3], wherein the recycled polyester resin includes at least one selected from the group consisting of recycled [polycarbonate/polyethylene terephthalate], recycled [polyethylene terephthalate/glycol-modified polyethylene terephthalate], and recycled [polyethylene terephthalate/copolymerized polyethylene terephthalate].
  • the polymerization conversion rate was defined as the ratio (%) of the actual solid content to the solid content at the ideal conversion rate.
  • polystyrene with a known number average molecular weight was used, and GPC was performed under the above-mentioned conditions to obtain a calibration curve. Then, GPC was performed under the above-mentioned conditions for the samples (polymer (A) and polymer (B)), and the number average molecular weight of each sample was calculated from the calibration curve.
  • melt flow rate (MFR) of polyester resin, pellets and resin composition (recycled polyester resin composition or polyester resin composition)
  • MFR melt flow rate
  • ⁇ L of film (molded product)
  • the ⁇ L of the resin composition of each of the Examples, Comparative Examples, and Reference Examples was measured by the following method: (1) Pellets of the resin composition were heated to 270° C. using an extruder equipped with a T-die (LABO PLASTOMILL, manufactured by Toyo Seiki Seisakusho Co., Ltd.) to form a film having a thickness of 200 ⁇ m; (2) The obtained film was punched into a dumbbell-shaped No.
  • dumbbell 2 shape according to JIS K 6251 to obtain a dumbbell; (3) The L value of the obtained dumbbell was measured using a colorimetric color difference meter (Color Meter ZE6000, manufactured by Nippon Denshoku Kogyo Co., Ltd.), and the obtained value was taken as the L value before tension; (4) The dumbbell was punched into a dumbbell-shaped No. 2 shape according to JIS K 6251 to obtain a dumbbell; In accordance with 7113, the film was stretched to 8.5 times its original size at 95° C.
  • Colorimetric color difference meter Color Meter ZE6000, manufactured by Nippon Denshoku Kogyo Co., Ltd.
  • the L value of the stretched dumbbell was measured using the color difference meter, and the obtained value was defined as the L value after stretching; (6) The L value before stretching was subtracted from the L value after stretching, and the obtained difference was defined as the ⁇ L of the film (molded product).
  • L Value of Molded Article The L value of the molded article was measured using a color difference meter (Color Meter ZE6000, manufactured by Nippon Denshoku Industries Co., Ltd.).
  • Total light transmittance (TT) of molded body The total light transmittance (TT) of the molded article was measured using a haze meter (manufactured by Nippon Denshoku Industries Co., Ltd., NDH4000).
  • Wall Thickness of Bottle The wall thickness of the bottle (molded product) was measured at each distance vertically upward from the bottom of the bottle (molded product) using a magnetic thickness meter (Magna Mike, manufactured by Olympus).
  • Powder Productivity 2.5 g of powder was spread on a SUS plate to the same thickness within an area of 2 cm x 5 cm. Next, the same type of SUS plate was placed on top of the SUS plate to sandwich the powder. A 5 kg weight was placed on top and heated in an oven at 70°C for 2 hours. After natural cooling, the SUS plate was turned vertically and the weight percentage of the powder still attached to the SUS plate was measured. The evaluation criteria are as follows, and the larger the number, the better the powder productivity. 2 (good): less than 20% by weight 1 (pass): 20% to 50% by weight 0 (poor): greater than 50% by weight.
  • Example A1 (Production of Polymer (A)) 180 parts by weight of purified water, 1.5 parts by weight of sodium formaldehyde sulfoxylate, 0.0075 parts by weight of EDTA, 0.3 parts by weight of ferrous sulfate heptahydrate, and 0.1 parts by weight of sodium polyoxyethylene lauryl ether phosphate were added to a reactor. The temperature in the reactor was increased to 75° C. while stirring the mixture in the reactor, and nitrogen was used to bubble the mixture for 30 minutes.
  • a monomer mixture (A) consisting of 35 parts by weight of methyl methacrylate (MMA) as component (b), 15 parts by weight of glycidyl methacrylate (GMA) as component (a), and 2 parts by weight of n-octyl mercaptan as a chain transfer agent was added to the reactor over 150 minutes.
  • MMA methyl methacrylate
  • GMA glycidyl methacrylate
  • n-octyl mercaptan as a chain transfer agent
  • the polymer (A) can be regarded as forming the core portion, and the polymer (B) as forming the shell portion.
  • the composite can be regarded as having a core-shell structure.
  • the obtained latex contained two types of number average molecular weights (Mn), with polymer (A) (core component) having a number average molecular weight of 3,000 and polymer (B) (shell component) having a number average molecular weight of 4,000.
  • Mn number average molecular weights
  • the average number of epoxy groups in polymer (A) (core component) was 5, the average number of epoxy groups in polymer (B) (shell component) was 6, and the average number of epoxy groups per polymer molecule was 5.5.
  • the obtained latex was quickly added to a 5% calcium chloride aqueous solution while stirring the 5% calcium chloride aqueous solution.
  • the temperature of the mixture was maintained at 70°C by steam.
  • the temperature of the mixture was then raised to 85°C to dehydrate the aggregates of composite particles.
  • the obtained aggregates were dried to obtain a composite powder.
  • the powder was then sieved through an 18-mesh screen, and the powder that passed through the 18-mesh screen was obtained as a whitening inhibitor.
  • Example A2 Polymer (A) was produced in the same manner as in Example A1, except that the monomer mixture (A) in Example A1 was changed to a monomer mixture (A) consisting of 35 parts by weight of MMA, 15 parts by weight of GMA, and 1.5 parts by weight of n-octyl mercaptan. In Example A2, polymer (B) was not produced. In Example A2, a latex containing polymer (A) was finally obtained. Next, particles of polymer (A) were recovered as powder from the latex in the same manner as in Example A1, and the obtained powder was used as a whitening inhibitor.
  • Example A3 Polymer (A) was produced in the same manner as in Example A1. In Example A3, polymer (B) was not produced. In Example A3, a latex containing polymer (A) was finally obtained. Then, in the same manner as in Example A1, particles of polymer (A) were collected as powder from the latex, and the obtained powder was used as a whitening inhibitor.
  • Example A4 Polymer (A) was produced in the same manner as in Example A1, except that the monomer mixture (A) in Example A1 was changed to a monomer mixture (A) consisting of 42.5 parts by weight of MMA, 7.5 parts by weight of GMA, and 2 parts by weight of n-octyl mercaptan. In Example A4, polymer (B) was not produced. In Example A4, a latex containing polymer (A) was finally obtained. Next, particles of polymer (A) were recovered as powder from the latex in the same manner as in Example A1, and the obtained powder was used as a whitening inhibitor.
  • Example A1 (Comparative Example A1) In Example A1, (i) 35 parts by weight of MMA in the monomer mixture (A) was changed to 70 parts by weight of styrene (St), and 2 parts by weight of n-octyl mercaptan was changed to 1 part by weight, and (ii) 40 parts by weight of MMA in the monomer mixture (B) was changed to 20 parts by weight of St, 10 parts by weight of GMA was changed to 1 part by weight, and the amount of n-octyl mercaptan used was changed to 0 parts by weight (i.e., not used). Except for this, the same operation as that described in Example A1 was carried out to obtain a latex containing a complex.
  • St styrene
  • n-octyl mercaptan 40 parts by weight of MMA in the monomer mixture (B) was changed to 20 parts by weight of St
  • 10 parts by weight of GMA was changed to 1 part by weight
  • the complex in the obtained latex had a number average molecular weight of 9,900 for the polymer (A) and a number average molecular weight of 120,000 for the polymer (B), an average number of epoxy groups per molecule of the polymer (A) was 9, and an average number of epoxy groups per molecule of the polymer (B) was unknown. Thereafter, a powder of the complex was obtained from the latex in the same manner as in Example A1, and used as a whitening inhibitor.
  • Example A1 For the whitening inhibitors of Examples A1 to A4 and Comparative Example A1, the parts by weight of each of the polymers (A) and (B), the number average molecular weight, the number of reactive functional groups per molecule, and the amount (wt%) of component (a) in 100 wt% of the polymer or composite are shown in Table 1. Powder productivity was also evaluated. The results are shown in Table 1.
  • LABO PLASTOMILL twin-screw extruder
  • Polyester-based resin recycled polyester-based resin (rPET FG Resins).
  • LABO PLASTOMILL twin-screw extruder
  • Examples A9, A10, Comparative Example A3 and Reference Example A2 Production of resin composition
  • the mixture was melt-kneaded at 270° C. in the extruder, and the melt-kneaded product extruded from the die was cut. By this operation, pellets of the resin composition were obtained.
  • Reference example A3 The resin composition of Reference Example A3 was obtained by charging recycled polyester resin pellets into a batch-type SSP reactor and carrying out solid-phase polymerization at 230°C.
  • the bottles (molded bodies) obtained in each Example A, Comparative Example A, and Reference Example A were measured for L value, haze, total light transmittance (TT), wall thickness (distance from the bottom), and buckling strength using the methods described above. The results are shown in Table 4.
  • the L value of Reference Example A2 which does not contain a whitening inhibitor, was subtracted from the L value of each Example A and Comparative Example A, and the obtained difference (value) was taken as ⁇ L for each Example A and Comparative Example A, and is shown in Table 4.
  • the haze of the solution was measured for the bottles (molded bodies) obtained in each Example A and Reference Example A3.
  • Polyester resin Recycled PET bottle flakes, which are crushed recycled PET bottles, were used.
  • LABO PLASTOMILL twin-screw extruder
  • the obtained pellets were used for SSP until the melt viscosity (IV value) reached 0.84, to produce a recycled polyester resin composition.
  • the pellets were placed in a rotary reactor and stirred while being heated to allow the reaction to proceed. Heating was carried out in the following order from (i) to (vii) at the temperatures and times shown in Table 6, through steps (i) to (vii), and after the reaction, the pellets were removed as is.
  • the melt viscosity (IV value), MFR, and ⁇ L were measured for the recycled PET bottle flakes, pellets containing the polyester resin whitening inhibitor and the polyester resin, and the recycled polyester resin composition after the SSP process, which were used in each Example B and Comparative Example B.
  • the measurement results and the polymerization time of the SSP until the IV value reached 0.84 in the SSP are shown in Table 5.
  • Example B1 Manufacture of bottles (molded bodies)
  • the recycled polyester resin composition obtained in Example B1 was injection molded at a molding temperature of 280° C. using an injection molding machine (Nissei Plastic Industrial Co., Ltd., FNX-140, screw ⁇ 45) to obtain a preform molded body.
  • the obtained preform molded body was blow molded at a surface temperature of about 100° C. using a blow molding machine (Frontier Co., Ltd., FXT-1R) to obtain a 500 ml bottle (molded body).
  • a bottle (molded body) was obtained by the above-mentioned method using a recycled polyester resin composition obtained by the same method as in Example B, but using the whitening inhibitor obtained in Comparative Example A1 instead of the whitening inhibitor obtained in Example A1.
  • the bottle (molded body) obtained from the recycled polyester resin composition obtained in Example B1 had a smaller degree of whitening than the bottle (molded body) obtained from the recycled polyester resin composition obtained by the same method as in Example B, but using the whitening inhibitor obtained in Comparative Example A1 instead of the whitening inhibitor obtained in Example A1.
  • a molded body containing recycled polyester-based resin which has excellent strength and reduced whitening.
  • a whitening inhibitor for polyester-based resin which can provide a polyester-based resin composition that can provide a molded body with excellent strength and reduced whitening.
  • one embodiment of the present invention can be suitably used in the following fields: automotive applications such as cylinder head covers, engine covers, intake manifolds, radiator tanks, oil pans, accelerator pedals, canisters, fuel tubes, air brake tubes, exhaust gas tubes, hydrogen injectors, ducts, industrial fasteners, and door mirror stays; electrical and electronic applications such as coil bobbins, connectors, gears, sockets, switches, electric blanket coated wires, optical fiber cable coatings, power tools, and wire ties; mechanical applications such as hydraulic and pneumatic connectors and tubes, bearings, covers and housings, bearings, pressure-resistant hoses, and cable ties; building material applications such as curtain rail parts, aluminum sash corners, door rollers, handrails, curtain rollers, and door handles; sports and leisure applications such as sports shoe soles, ski and snowboard equipment, reels, and diving snorkels; packaging materials and container applications such as shrink packaging films, food packaging films, alcoholic beverage bottles, beverage bottles, and pesticide bottles; and medical applications such as toothbrushes, chair legs and water

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
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Abstract

La présente invention aborde le problème de la fourniture d'un corps moulé qui contient une résine à base de polyester recyclé, le corps moulé ayant une excellente résistance et un blanchiment réduit. L'invention concerne un corps moulé obtenu par moulage d'une composition de résine contenant une résine à base de polyester recyclée, le trouble d'une solution du corps moulé étant de 1,50 % ou plus, et le trouble du corps moulé étant de 7,5 ou moins.
PCT/JP2024/041974 2023-11-27 2024-11-27 Corps moulé contenant une résine à base de polyester recyclé Pending WO2025115902A1 (fr)

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JP2023-200081 2023-11-27
JP2023-200083 2023-11-27
JP2023-200080 2023-11-27
JP2023200083 2023-11-27
JP2023200080 2023-11-27

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004041934A1 (fr) * 2002-11-07 2004-05-21 Kaneka Corporation Composition de resine polyester thermoplastique et objet moule obtenu a partir de cette composition
JP2005200534A (ja) * 2004-01-15 2005-07-28 Fukuvi Chem Ind Co Ltd 成形材料用樹脂組成物
JP2006045554A (ja) * 2004-07-09 2006-02-16 Toyobo Co Ltd ポリエステル及びそれからなるポリエステル組成物並びにこれらからなるポリエステル成形体
JP2006193710A (ja) * 2004-08-03 2006-07-27 Toyobo Co Ltd ポリエステル樹脂組成物
JP2006232976A (ja) * 2005-02-24 2006-09-07 Toyobo Co Ltd ポリエステル樹脂用改質剤およびこれを用いた成形品の製造方法
JP2011132477A (ja) * 2009-12-25 2011-07-07 Japan Polypropylene Corp 繊維強化ポリ乳酸含有樹脂組成物及び射出成形体
JP2012102316A (ja) * 2010-10-14 2012-05-31 Toyo Seikan Kaisha Ltd 透明性に優れた射出成形品及びその製造方法
US20220089860A1 (en) * 2019-03-21 2022-03-24 Shpp Global Technologies B.V. High stiff thermoplastic compositions for thin-wall structures
JP2022521406A (ja) * 2019-02-20 2022-04-07 東レ先端素材株式会社 光学用ポリエステルフィルム

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004041934A1 (fr) * 2002-11-07 2004-05-21 Kaneka Corporation Composition de resine polyester thermoplastique et objet moule obtenu a partir de cette composition
JP2005200534A (ja) * 2004-01-15 2005-07-28 Fukuvi Chem Ind Co Ltd 成形材料用樹脂組成物
JP2006045554A (ja) * 2004-07-09 2006-02-16 Toyobo Co Ltd ポリエステル及びそれからなるポリエステル組成物並びにこれらからなるポリエステル成形体
JP2006193710A (ja) * 2004-08-03 2006-07-27 Toyobo Co Ltd ポリエステル樹脂組成物
JP2006232976A (ja) * 2005-02-24 2006-09-07 Toyobo Co Ltd ポリエステル樹脂用改質剤およびこれを用いた成形品の製造方法
JP2011132477A (ja) * 2009-12-25 2011-07-07 Japan Polypropylene Corp 繊維強化ポリ乳酸含有樹脂組成物及び射出成形体
JP2012102316A (ja) * 2010-10-14 2012-05-31 Toyo Seikan Kaisha Ltd 透明性に優れた射出成形品及びその製造方法
JP2022521406A (ja) * 2019-02-20 2022-04-07 東レ先端素材株式会社 光学用ポリエステルフィルム
US20220089860A1 (en) * 2019-03-21 2022-03-24 Shpp Global Technologies B.V. High stiff thermoplastic compositions for thin-wall structures

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