Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K3/00—Use of inorganic substances as compounding ingredients
  • C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
  • C08K3/013—Fillers, pigments or reinforcing additives
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L71/00—Compositions of polyethers obtained by reactions forming an ether link in the main chain; Compositions of derivatives of such polymers
  • C08L71/08—Polyethers derived from hydroxy compounds or from their metallic derivatives
  • C08L71/10—Polyethers derived from hydroxy compounds or from their metallic derivatives from phenols

Definitions

• the present invention relates to a polyolefin resin composition.
• Patent Document 1 discloses a polyamide resin composition that contains, per 100 parts by weight of the polyamide resin, 1 to 80 parts by weight of a bromine-based flame retardant having a specific chemical structure, 10 to 100 parts by weight of glass fiber, and 1 to 30 parts by weight of an antimony-based flame retardant assistant.
• Patent Document 2 discloses a polyester resin composition that contains a polyester resin, 1 to 80 parts by weight of a bromine-based flame retardant having a specific chemical structure, 10 to 100 parts by weight of glass fiber, and 1 to 30 parts by weight of an antimony-based flame retardant assistant, per 100 parts by weight of the polyester resin.
• One aspect of the present invention aims to provide a new resin composition that can suppress adverse effects on the ecosystem.
• a polyolefin-based resin composition includes a polyolefin-based resin and a polymeric brominated flame retardant, and the polymeric brominated flame retardant includes a structure represented by the following general formula (1): (wherein R 1 represents a C1 to C6 alkylene group, a C2 to C6 alkylidene group, -S-, or -SO 2 -).
• a polyolefin-based resin composition according to one embodiment of the present invention (hereinafter, may be simply abbreviated as "resin composition”) contains a polyolefin-based resin and a polymeric brominated flame retardant, and the polymeric brominated flame retardant has a structure represented by the following general formula (1). (wherein R 1 represents a C1 to C6 alkylene group, a C2 to C6 alkylidene group, -S-, or -SO 2 -).
• the resin composition according to one embodiment of the present invention is a polyolefin resin composition whose main component is a polyolefin resin, and contains a polymeric bromine-based flame retardant, making it a polyolefin resin composition that can suppress adverse effects on ecosystems.
• the reason for this is that, among bromine-based flame retardants, polymeric bromine-based flame retardants are less likely to accumulate in living organisms than non-polymeric bromine-based flame retardants.
• Such effects contribute to the achievement of, for example, Goal 14 of the Sustainable Development Goals (SDGs) advocated by the United Nations, "Conserve and sustainably use the oceans and seas.”
• SDGs Sustainable Development Goals
• the resin composition according to one embodiment of the present invention is flame retardant due to the inclusion of a polymeric bromine-based flame retardant.
• the level of flame retardancy of the resin composition according to one embodiment of the present invention is not particularly limited, but for example, the resin composition according to one embodiment of the present invention preferably has a flame retardancy of V-2 or higher, more preferably V-1 or higher, and even more preferably V-0 or higher, in terms of the flammability ranking according to the UL94V standard when used as a test piece with a thickness of 0.8 mm.
• Such a resin composition can be suitably used as a material for any article requiring flame retardancy.
• the polyolefin resin is a homopolymer or copolymer of an olefin.
• the content of the polyolefin resin is preferably in the following range from the viewpoint of reducing adverse effects on mechanical properties such as impact strength.
• the content of the polyolefin resin is preferably 40 parts by mass or more when the total amount of the polyolefin resin, the polymeric bromine-based flame retardant, the inorganic filler that is optionally included, and the flame retardant auxiliary that is optionally included is 100 parts by mass.
• the content of the polyolefin resin is preferably in the following range from the viewpoint of flame retardancy.
• the content of the polyolefin resin is 75 parts by mass or less, preferably 50 parts by mass or less, and more preferably 45 parts by mass or less when the total amount of the polyolefin resin, the polymeric bromine-based flame retardant, the inorganic filler that is optionally included, and the flame retardant auxiliary that is optionally included is 100 parts by mass.
• the polyolefin resin is preferably a polypropylene resin that contains at least propylene.
• the polypropylene-based resin preferably contains at least one of polypropylene, which is a homopolymer of propylene, and a copolymer of propylene and another olefin.
• the copolymer of propylene and another olefin include a propylene-ethylene copolymer in which ethylene is copolymerized with propylene, a block copolymer containing a propylene-ethylene copolymer, and a random copolymer in which ethylene and butene-1 are copolymerized with propylene.
• the polypropylene-based resin is preferably polypropylene.
• the polypropylene resin is preferably an unmodified polypropylene resin.
• unmodified means that the target compound has no substituents other than the basic structure
• an "unmodified polypropylene resin” is a polypropylene resin that has no substituents.
• An example of an unmodified polypropylene resin is a polypropylene resin that does not have a polar group such as maleic acid.
• the polyolefin resin can be any polyolefin resin commercially available, and one with suitable properties can be selected according to the application and processing conditions of the composition.
• the polyolefin resin has a melt flow rate (MFR) measured under conditions of 230°C and 2.16 kg in the following range.
• MFR melt flow rate
• the MFR is preferably 1 g/10 min or more, more preferably 10 g/10 min or more, and even more preferably 20 g/10 min or more.
• the MFR is preferably 70 g/10 min or less, more preferably 60 g/10 min or less, even more preferably 55 g/10 min or less, even more preferably 50 g/10 min or less, and particularly preferably 45 g/10 min or less.
• MFR is measured at 230°C and 2.16 kg in accordance with ASTM D-1238 (2013).
• the decomposition temperature of the polyolefin resin is preferably greater than 400°C, and more preferably greater than 420°C.
• the decomposition temperature of the polyolefin resin is preferably less than 500°C, and more preferably less than 480°C.
• the polymer-type brominated flame retardant is a polymer containing a structure represented by the following general formula (1) (hereinafter referred to as "structure (1)").
• structure (1) represents a C1 to C6 alkylene group, a C2 to C6 alkylidene group, -S-, or -SO 2 -.
• the resin composition according to one embodiment of the present invention contains a polymeric bromine-based flame retardant, and is therefore capable of exhibiting flame retardancy. Furthermore, the resin composition according to one embodiment of the present invention contains a polymeric bromine-based flame retardant, and is therefore a polyolefin-based resin composition that can suppress adverse effects on ecosystems.
• polymeric bromine-based flame retardants high molecular weight polymeric bromine-based flame retardants are particularly preferred because they are highly effective in suppressing adverse effects on ecosystems.
• "high molecular weight polymeric bromine-based flame retardants” refers to polymeric bromine-based flame retardants with a weight average molecular weight of 1,000 or more in standard polystyrene equivalent.
• the C1 to C6 alkylene group is an alkylene group having 1 to 6 carbon atoms, such as a methylene group, an ethylene group, a trimethylene group, a tetramethylene group, and a hexamethylene group.
• the C2 to C6 alkylidene group is an alkylidene group having 2 to 6 carbon atoms, such as an ethylidene group, and an isopropylidene group.
• the polymeric brominated flame retardant may have a structure different from structure (1) so long as it is a polymer containing structure (1).
• the content (proportion) of structure (1) in the polymeric brominated flame retardant can be adjusted as appropriate and is not particularly limited. From the viewpoint of flame retardancy, the content (proportion) of structure (1) relative to the total amount of polymer in the polymeric brominated flame retardant is preferably 80 mol% or more, more preferably 90 mol% or more, and even more preferably 95 mol% or more.
• the polymeric brominated flame retardant may contain a repeating structure of structure (1).
• the molecular weight of the polymeric brominated flame retardant is not particularly limited. In consideration of a higher effect of suppressing adverse effects on the ecosystem and a higher heat resistance, the weight average molecular weight of the polymeric brominated flame retardant in standard polystyrene conversion is preferably 1000 or more, more preferably 2,000 or more, more preferably 5,000 or more, more preferably 10,000 or more, and even more preferably 20,000 or more.
• the weight average molecular weight of the polymeric brominated flame retardant in standard polystyrene conversion is 30,000 or less, it is preferable from the viewpoint that the polymeric brominated flame retardant can be decomposed in accordance with the decomposition of polyolefin and the combustion of olefin-derived gas can be suppressed.
• a preferred embodiment of the polymer-type brominated flame retardant is a polymer containing a structure represented by the following general formula (2).
• R 1 represents a C1 to C6 alkylene group, a C2 to C6 alkylidene group, -S-, or -SO 2 -;
• R 2 represents a C2 to C4 alkylene group; and
• n is an average value of 1 or more.
• the C1 to C6 alkylene groups and the C2 to C6 alkylidene groups are as described above.
• the C2 to C4 alkylene groups are alkylene groups having 2 to 4 carbon atoms, such as ethylene, trimethylene, and tetramethylene groups.
• the polymeric bromine-based flame retardant may be a condensation polymer obtained by condensation polymerization of a tetrabromobisphenol compound and an alkyl halide compound.
• a condensation polymer can be obtained, for example, by reacting a tetrabromobisphenol compound with an alkyl halide compound in the presence of a base, and can be produced, for example, according to the synthesis method described in Patent Document 1 or 2.
• the tetrabromobisphenol compound is not particularly limited, but examples thereof include tetrabromobisphenol A and tetrabromobisphenol F.
• the alkyl halide compound is not particularly limited, but examples thereof include ethane dichloride, 1,3-dichloropropane, and 1,4-dichlorobutane.
• the base is not particularly limited, but examples thereof include sodium hydrogen carbonate. These compounds can be used alone or in combination of two or more.
• the polymer-type bromine-based flame retardant is not particularly limited, but examples thereof include a polymer obtained by polymerizing tetrabromobisphenol F and dichloroethane, a polymer obtained by polymerizing tetrabromobisphenol A and dichloroethane, a polymer obtained by polymerizing tetrabromobisphenol F and 1,3-dichloropropane, a polymer obtained by polymerizing tetrabromobisphenol A and 1,3-dichloropropane, a polymer obtained by polymerizing tetrabromobisphenol F and 1,4-dichlorobutane, a polymer obtained by polymerizing tetrabromobisphenol A and 1,4-dichlorobutane, etc.
• R 1 in the general formula (2) is a C3 isopropylidene group
• R 2 is a C2-C4
• the polymeric brominated flame retardant is preferably a polymer obtained by polymerizing tetrabromobisphenol A and 1,4-dichlorobutane. That is, in the general formula (2), R 1 is preferably a C3 isopropylidene group, and R 2 is more preferably a C4 alkylene group.
• the polymer-type bromine-based flame retardants may be used alone or in combination of two or more.
• the content of the polymeric bromine-based flame retardant is preferably in the following range from the viewpoint of expressing flame retardancy in the resin composition according to one embodiment of the present invention.
• the content of the polymeric bromine-based flame retardant is 20 parts by mass or more, for example, 21 parts by mass or more, 24 parts by mass or more, or 25 parts by mass or more, when the total amount of the polyolefin resin, the polymeric bromine-based flame retardant, the inorganic filler optionally contained, and the flame retardant auxiliary optionally contained is 100 parts by mass.
• the content of the polymeric bromine-based flame retardant is preferably in the following range from the viewpoint of efficiently generating an inert gas for suppressing combustion.
• the content of the polymeric bromine-based flame retardant is preferably 30 parts by mass or less, when the total amount of the polyolefin resin, the polymeric bromine-based flame retardant, the inorganic filler optionally contained, and the flame retardant auxiliary optionally contained is 100 parts by mass.
• the resin composition according to one aspect of the present invention may not contain an inorganic filler, but preferably further contains an inorganic filler. By containing an inorganic filler, even better flame retardancy can be obtained. By further adding an inorganic filler to the resin composition according to one aspect of the present invention, a resin composition having high flame retardancy can be provided even though a polymeric bromine-based flame retardant is used. In other words, by further adding an inorganic filler to the resin composition according to one aspect of the present invention, it becomes possible to impart sufficient flame retardancy by adding a smaller amount of a polymeric bromine-based flame retardant. In addition, by further containing an inorganic filler in the resin composition according to one aspect of the present invention, the mechanical properties of the resin can be improved.
• the content of the inorganic filler is preferably in the following range from the viewpoint of improving the flame retardancy in the resin composition according to one embodiment of the present invention.
• the content of the inorganic filler is preferably 18 parts by mass or more, more preferably 20 parts by mass or more, even more preferably 21 parts by mass or more, and even more preferably 25 parts by mass or more, when the total amount of the polyolefin resin, the polymer-type bromine-based flame retardant, the inorganic filler, and the flame retardant auxiliary optionally contained is 100 parts by mass.
• the content of the inorganic filler is preferably in the following range from the viewpoint of improving the fluidity of the resin composition.
• the content of the inorganic filler is preferably 30 parts by mass or less, when the total amount of the polyolefin resin, the polymer-type bromine-based flame retardant, the inorganic filler, and the flame retardant auxiliary optionally contained is 100 parts by mass.
• the resin composition according to one embodiment of the present invention further contains an inorganic filler
• the amount of polyolefin resin so that the total amount of the polyolefin resin and the inorganic filler is 75 parts by mass or less.
• the compounding ratio (parts by mass) of the inorganic filler to the total amount of the polymeric bromine-based flame retardant and the flame retardant assistant optionally contained therein is preferably 0.55 or more, more preferably 0.70 or more, from the viewpoint of improving the flame retardancy in the resin composition according to one embodiment of the present invention.
• the compounding ratio of the inorganic filler to the total amount of the polymeric bromine-based flame retardant and the flame retardant assistant is preferably 0.85 or less, from the viewpoint of improving the fluidity of the resin composition.
• the resin composition according to one aspect of the present invention may not contain a flame retardant assistant, but preferably further contains a flame retardant assistant.
• a flame retardant assistant By further adding a flame retardant assistant to the resin composition according to one aspect of the present invention, a resin composition having high flame retardancy can be provided even if a polymer-type bromine-based flame retardant is used.
• a flame retardant assistant By further adding a flame retardant assistant to the resin composition according to one aspect of the present invention, it becomes possible to impart sufficient flame retardancy by adding a smaller amount of a polymer-type bromine-based flame retardant.
• the flame retardant aid is not particularly limited, and examples thereof include antimony-based flame retardant aids such as antimony trioxide, antimony tetraoxide, antimony pentoxide, and sodium antimonate. From the viewpoint of the flame retardancy of the resin, it is preferable that the flame retardant aid is antimony trioxide.
• the content of the flame retardant assistant is preferably within the following range from the viewpoint of improving the flame retardancy in the resin composition according to one embodiment of the present invention.
• the content of the flame retardant assistant is preferably 6 parts by mass or more when the total amount of the polyolefin resin, the polymeric bromine-based flame retardant, the inorganic filler optionally included, and the flame retardant assistant is 100 parts by mass.
• the content of the flame retardant assistant is preferably within the following range from the viewpoint of efficiently generating an inert gas for suppressing combustion.
• the content of the flame retardant assistant is preferably 8 parts by mass or less when the total amount of the polyolefin resin, the polymeric bromine-based flame retardant, the inorganic filler optionally included, and the flame retardant assistant is 100 parts by mass.
• the compounding ratio (parts by mass) of the polymeric brominated flame retardant to the flame retardant assistant is preferably 2.5 or more, and more preferably 3.0 or more, from the viewpoint of improving the flame retardancy of the resin composition according to one embodiment of the present invention.
• the mass ratio of the polymeric brominated flame retardant to the flame retardant assistant is preferably 4.5 or less, and more preferably 4 or less, from the viewpoint of efficiently generating an inert gas for suppressing combustion.
• the resin composition according to one aspect of the present invention may further contain other additives within a range that does not impair the effects of the present invention.
• the additives include antioxidants, lubricants, anti-drip agents, weather resistance agents, antibacterial agents, pigments, crystal nucleating agents, molecular weight regulators, foaming agents, dispersants, antistatic agents, neutralizing agents, metal deactivators, and inorganic fillers.
• the antioxidant is a substance that has the function of preventing oxidation of the resin composition according to one embodiment of the present invention.
• examples of the antioxidant include phenol-based, phosphorus-based, and thioether-based compounds.
• examples of the phenol-based antioxidant include 2,6-di-tert-butyl-p-cresol, 2,6-diphenyl-4-octadecyloxyphenol, distearyl (3,5-di-tert-butyl-4-hydroxybenzyl)phosphonate, 1,6-hexamethylenebis[(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid amide], 4,4'-thiobis(6-tert-butyl-m-cresol), 2,2'-methylenebis(4-methyl-6-tert-butylphenol), 2,2'-methylenebis(4-ethyl-6-tert-butylphenol), 4,4'-butylidenebis(6-tert-buty
• phosphorus-based antioxidants include trisnonylphenyl phosphite, tris[2-tert-butyl-4-(3-tert-butyl-4-hydroxy-5-methylphenylthio)-5-methylphenyl]phosphite, tridecyl phosphite, octyldiphenyl phosphite, di(decyl)monophenyl phosphite, di(tridecyl)pentaerythritol diphosphite, di(nonylphenyl)pentaerythritol diphosphite, bis(2,4-ditert-butylphenyl)pentaerythritol diphosphite, bis(2,6-ditert-butyl-4 bis(2,4,6-tri-tert-butylphenyl)pentaerythritol diphosphit
• thioether antioxidant examples include dialkyl thiodipropionates such as dilauryl thiodipropionate, dimyristyl thiodipropionate, and distearyl thiodipropionate, and pentaerythritol tetra( ⁇ -alkylmercaptopropionate esters). These may be used in combination of two or more. Of these, it is preferable to use a phenol-based antioxidant in combination with a phosphorus-based antioxidant in order to sufficiently prevent oxidation of the resin composition.
• the content of the antioxidant is preferably in the following range from the viewpoint of sufficiently preventing oxidation of the resin composition according to one embodiment of the present invention.
• the content of the antioxidant is preferably 0.05 parts by mass or more, more preferably 0.1 parts by mass or more, and even more preferably 0.2 parts by mass or more, when the total amount of the polyolefin resin, the polymeric bromine-based flame retardant, the inorganic filler optionally contained, and the flame retardant auxiliary is 100 parts by mass.
• the content of the antioxidant is preferably in the following range.
• the content of the antioxidant is preferably 5 parts by mass or less, more preferably 3 parts by mass or less, and even more preferably 2 parts by mass or less, when the total amount of the polyolefin resin, the polymeric bromine-based flame retardant, the inorganic filler optionally contained, and the flame retardant auxiliary is 100 parts by mass.
• the lubricant is a substance that has the function of improving the molding processability of the resin composition according to one embodiment of the present invention.
• examples of lubricants include glycerin fatty acid esters and metal soaps. Among them, glycerin fatty acid esters are preferred from the viewpoint of improving the fluidity of the resin composition.
• the content of the lubricant is preferably in the following range from the viewpoint of sufficiently improving the moldability of the resin composition according to one embodiment of the present invention.
• the content of the lubricant is preferably 0.05 parts by mass or more, more preferably 0.1 parts by mass or more, and even more preferably 0.2 parts by mass or more, when the total amount of the polyolefin resin, the polymer-type bromine-based flame retardant, the inorganic filler optionally contained, and the flame retardant auxiliary is 100 parts by mass.
• the content of the lubricant is preferably in the following range from the viewpoint of preventing bleeding of the lubricant.
• the content of the lubricant is preferably 5 parts by mass or less, more preferably 3 parts by mass or less, and even more preferably 2 parts by mass or less, when the total amount of the polyolefin resin, the polymer-type bromine-based flame retardant, the inorganic filler optionally contained, and the flame retardant auxiliary is 100 parts by mass.
• the drip prevention agent is a substance that has the function of preventing dripping during combustion of the resin composition according to one embodiment of the present invention and improving flame retardancy.
• drip prevention agents include acrylic modified polytetrafluoroethylene.
• the content of the drip prevention agent is preferably in the following range from the viewpoint of sufficiently improving the moldability of the resin composition according to one embodiment of the present invention.
• the content of the drip prevention agent is preferably 0.1 parts by mass or more, more preferably 0.3 parts by mass or more, and even more preferably 0.5 parts by mass or more, when the total amount of the polyolefin resin, the polymer-type bromine-based flame retardant, the inorganic filler optionally contained, and the flame retardant auxiliary is 100 parts by mass.
• the content of the drip prevention agent is preferably in the following range from the viewpoint of suppressing clogging of the mesh during kneading.
• the content of the drip prevention agent is preferably 5 parts by mass or less, more preferably 3 parts by mass or less, and even more preferably 2 parts by mass or less, when the total amount of the polyolefin resin, the polymer-type bromine-based flame retardant, the inorganic filler optionally contained, and the flame retardant auxiliary is 100 parts by mass.
• the weather resistance agent is a substance that imparts weather resistance to the resin composition according to one embodiment of the present invention.
• weather resistance agents that can be used include ultraviolet absorbers and hindered amine light stabilizers.
• ultraviolet absorbers include 2-hydroxybenzophenones such as 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone, and 5,5'-methylenebis(2-hydroxy-4-methoxybenzophenone); 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, and 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole.
• 2-(2'-hydroxyphenyl)benzotriazoles such as 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-dicumylphenyl)benzotriazole, 2,2'-methylenebis(4-tert-octyl-6-(benzotriazolyl)phenol), and 2-(2'-hydroxy-3'-tert-butyl-5'-carboxyphenyl)benzotriazole; phenylsa Benzoates such as ricinate, resorcinol monobenzoate, 2,4-di-tert-butylphenyl-3,5-di-tert-butyl-4-hydroxybenzoate, 2,4-di-tert-amylphenyl-3,5-di-tert-butyl-4-hydroxybenzoate, and hexadecyl-3,5-di-tert-butyl-4-hydroxy
• hindered amine light stabilizer examples include 2,2,6,6-tetramethyl-4-piperidyl stearate, 1,2,2,6,6-pentamethyl-4-piperidyl stearate, 2,2,6,6-tetramethyl-4-piperidyl benzoate, bis(2,2,6,6-tetramethyl-4-piperidyl)sebacate, bis(1,2,2,6,6-tetramethyl-4-piperidyl)sebacate, bis(1-octoxy-2,2,6,6-tetramethyl-4-piperidyl)sebacate, and tetrakis(2,2,6,6-tetramethyl-4-piperidyl)-1,2,3,4-butanetetracarboxylate.
• the content of the weather resistant agent is preferably in the following range from the viewpoint of imparting sufficient weather resistance to the resin composition according to one embodiment of the present invention.
• the content of the weather resistant agent is preferably 0.01 parts by mass or more, more preferably 0.05 parts by mass or more, and even more preferably 0.1 parts by mass or more, when the total amount of the polyolefin resin, the polymeric bromine-based flame retardant, the inorganic filler optionally contained, and the flame retardant auxiliary is 100 parts by mass.
• the content of the weather resistant agent is preferably in the following range from the viewpoint of preventing a decrease in gloss due to bleed-out.
• the content of the weather resistant agent is preferably 5 parts by mass or less, more preferably 3 parts by mass or less, and even more preferably 2 parts by mass or less, when the total amount of the polyolefin resin, the polymeric bromine-based flame retardant, the inorganic filler optionally contained, and the flame retardant auxiliary is 100 parts by mass.
• An antibacterial agent is a substance that imparts antibacterial properties to the resin composition according to one embodiment of the present invention.
• antibacterial agents include, but are not limited to, organic compound-based antibacterial agents, natural organic antibacterial agents, inorganic antibacterial agents, etc.
• the content of the antibacterial agent is preferably in the following range from the viewpoint of imparting sufficient antibacterial properties to the resin composition according to one embodiment of the present invention.
• the content of the antibacterial agent is preferably 0.01 parts by mass or more, more preferably 0.1 parts by mass or more, and even more preferably 0.3 parts by mass or more, when the total amount of the polyolefin resin, the polymer-type bromine-based flame retardant, the inorganic filler optionally contained, and the flame retardant auxiliary is 100 parts by mass.
• the content of the antibacterial agent is preferably in the following range from the viewpoint of preventing a deterioration in impact properties and further increase in costs.
• the content of the antibacterial agent is preferably 5 parts by mass or less, more preferably 3 parts by mass or less, and even more preferably 1 part by mass or less, when the total amount of the polyolefin resin, the polymer-type bromine-based flame retardant, the inorganic filler optionally contained, and the flame retardant auxiliary is 100 parts by mass.
• the pigment prevents deterioration of the resin composition by blocking ultraviolet light.
• the pigment is preferably an inorganic pigment.
• inorganic pigments include TiO2 , carbon black, iron oxide, chromium oxide, and zinc oxide. In particular, TiO2 is preferable.
• the pigment content is preferably in the following range from the viewpoint of sufficiently preventing deterioration of the resin composition.
• the pigment content is preferably 0.1 parts by mass or more, more preferably 0.5 parts by mass or more, and even more preferably 1 part by mass or more, when the total amount of the polyolefin resin, the polymeric bromine-based flame retardant, the inorganic filler optionally contained, and the flame retardant auxiliary is 100 parts by mass.
• the pigment content is preferably in the following range from the viewpoint of exhibiting sufficient flame retardancy in the resin composition according to one embodiment of the present invention.
• the pigment content is preferably 10 parts by mass or less, more preferably 7 parts by mass or less, and even more preferably 5 parts by mass or less, when the total amount of the polyolefin resin, the polymeric bromine-based flame retardant, the inorganic filler optionally contained, and the flame retardant auxiliary is 100 parts by mass.
• the total amount of the other additives is preferably in the following range from the viewpoint of the performance expression of the additives.
• the total amount of the other additives is preferably 0.1 parts by mass or more, more preferably 0.5 parts by mass or more, and even more preferably 1 part by mass or more, when the total amount of the polyolefin resin, the polymer-type bromine-based flame retardant, the inorganic filler that is optionally included, and the flame retardant auxiliary that is optionally included is 100 parts by mass.
• the total amount of the other additives is preferably in the following range from the viewpoint of reducing the influence on the physical properties and flame retardancy of the obtained molded body.
• the total amount of the other additives is preferably 5 parts by mass or less, more preferably 3 parts by mass or less, and even more preferably 2 parts by mass or less, when the total amount of the polyolefin resin, the polymer-type bromine-based flame retardant, the inorganic filler that is optionally included, and the flame retardant auxiliary that is optionally included is 100 parts by mass.
• the shape of the resin composition according to one aspect of the present invention may be pellets, etc.
• the resin composition according to one aspect of the present invention is preferably thermoplastic.
• the resin composition according to one embodiment of the present invention can be produced, for example, by blending a polyolefin resin and a polymer-type bromine-based flame retardant, and, if necessary, at least one of an inorganic filler, a flame retardant aid, and an additive, and melt-kneading the blend.
• the above components can be blended and kneaded using a Henschel mixer, a Banbury mixer, a single-screw extruder, a twin-screw extruder, a multi-screw extruder, a co-kneader, or the like.
• the heating temperature during kneading is usually 160°C or higher and 250°C or lower.
• the above components may be blended and premixed (preblended) using commonly used equipment (e.g., ribbon blender, drum tumbler, etc.) and then kneaded using the above device.
• commonly used equipment e.g., ribbon blender, drum tumbler, etc.
• the molded article according to one embodiment of the present invention can be produced using the above-mentioned resin composition.
• the molded article according to one embodiment of the present invention can be produced by, for example, an injection molding method, an injection compression molding method, an extrusion molding method, a blow molding method, a press molding method, a vacuum molding method, a foam molding method, or the like.
• the molded article according to one aspect of the present invention can be used, for example, in home appliances, electrical equipment, etc.
• the polyolefin resin composition according to the first aspect of the present invention comprises a polyolefin resin and a polymeric brominated flame retardant, and the polymeric brominated flame retardant comprises a structure represented by the following general formula (1): (In the formula, R 1 represents a C1 to C6 alkylene group, a C2 to C6 alkylidene group, -S-, or -SO 2 -.)
• the weight average molecular weight of the polymeric brominated flame retardant in standard polystyrene equivalent is 1000 or more.
• the polyolefin resin composition according to Aspect 3 of the present invention is the polyolefin resin composition according to Aspect 1 or 2, wherein the polymeric bromine-based flame retardant may contain a structure represented by the following general formula (2).
• R 1 represents a C1 to C6 alkylene group, a C2 to C6 alkylidene group, -S-, or -SO 2 -
• R 2 represents a C2 to C4 alkylene group
• n is an average value of 1 or more.
• the polyolefin resin composition according to aspect 4 of the present invention is any one of aspects 1 to 3, in which the polymeric bromine-based flame retardant may be a condensation polymer obtained by condensation polymerization of a tetrabromobisphenol compound and an alkyl halide compound.
• the polyolefin resin composition according to aspect 5 of the present invention is any one of aspects 1 to 4 described above, further comprising an inorganic filler.
• the polyolefin resin composition according to aspect 6 of the present invention is the same as that according to aspect 5, wherein the inorganic filler is one or more selected from the group consisting of talc, calcium carbonate, glass fiber, and precipitated barium sulfate.
• the polyolefin resin composition according to aspect 7 of the present invention is the same as that according to aspect 5 or 6, except that the inorganic filler is preferably talc.
• the polyolefin resin composition according to aspect 8 of the present invention is any one of aspects 1 to 7 described above, and includes the polyolefin resin and the polymeric bromine-based flame retardant, and optionally includes an inorganic filler and a flame retardant auxiliary, and when the total amount of the polyolefin resin, the polymeric bromine-based flame retardant, the inorganic filler, and the flame retardant auxiliary is 100 parts by mass, the polyolefin resin contains 40 parts by mass or more and 75 parts by mass or less, and the polymeric bromine-based flame retardant contains 20 parts by mass or more and 30 parts by mass or less, and the total amount of the polyolefin resin and the inorganic filler may be 75 parts by mass or less.
• the polyolefin resin composition according to aspect 9 of the present invention may contain 18 parts by mass or more and 30 parts by mass or less of the inorganic filler in the above-mentioned aspect 8.
• the polyolefin resin composition according to aspect 10 of the present invention is the same as that according to aspect 8 or 9, wherein the inorganic filler is one or more selected from the group consisting of talc, calcium carbonate, glass fiber, and precipitated barium sulfate.
• the polyolefin resin composition according to aspect 11 of the present invention is the same as that according to aspect 8 or 9, except that the inorganic filler is preferably talc.
• Example 1 (Production of resin composition) The components and amounts shown in Table 1 were weighed and preblended. In Table 1, the units of amounts are parts by mass, and the values shown are those when the total amount of the polyolefin resin, the polymer-type bromine-based flame retardant, the inorganic filler, and the flame retardant auxiliary is taken as 100 parts by mass.
• the preblended mixture was melt-kneaded using a twin-screw extruder TEM37-SX (manufactured by Shibaura Machine Co., Ltd.) with a screw diameter of 37 mm and a cylinder temperature set to 220° C., and the strand discharged from the die was cooled in a cooling bath and cut with a pelletizer to obtain pellets (resin composition).
• TEM37-SX manufactured by Shibaura Machine Co., Ltd.
• the obtained pellets were used in an injection molding machine EC100SX (manufactured by Toshiba Machine Co., Ltd.) to prepare test pieces for evaluating flame retardancy having dimensions of 125 mm x 12.7 mm and thickness of 0.8 mm under conditions of a cylinder temperature of 210°C and a mold temperature of 50°C.
• Example 2 to 9 Reference Examples
• pellets (resin compositions) and test pieces were prepared in the same manner as in Example 1, except that the compositions were changed as shown in Table 1, and the flame retardancy was evaluated.
• Flame retardancy evaluation tests were performed using the test pieces of Examples 1 to 9 and Reference Example obtained. Flame retardancy was evaluated by performing a vertical combustion test in accordance with the UL94V standard using an HVUL plastic UL combustion test chamber "Atlas" (manufactured by Toyo Seiki Seisakusho Co., Ltd.).
• the five test pieces were each given a flammability rank according to the UL94V standard based on the first and second burning times and whether or not the cotton ignited, and their flame retardancy was evaluated.
• V-0 is the highest flammability rating, and flame retardancy decreases as it progresses to V-1 and V-2.
• Example 9 When a polymer-type bromine-based flame retardant is simply added to a polyolefin-based resin, as in Example 9, the flame retardancy is at the V-2 level. However, by further adding an inorganic filler, as in Examples 1 to 8, it was shown that it is possible to provide a polyolefin-based resin composition that, while using a polymer-type bromine-based flame retardant, has high flame retardancy that is comparable to the reference examples that use conventional bromine-based flame retardants.
• the polyolefin resin composition according to one embodiment of the present invention can be suitably used as a resin composition for any molded article requiring flame retardancy.

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