WO2011049114A1 - 両面粘着シート - Google Patents
両面粘着シート Download PDFInfo
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- WO2011049114A1 WO2011049114A1 PCT/JP2010/068455 JP2010068455W WO2011049114A1 WO 2011049114 A1 WO2011049114 A1 WO 2011049114A1 JP 2010068455 W JP2010068455 W JP 2010068455W WO 2011049114 A1 WO2011049114 A1 WO 2011049114A1
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- Prior art keywords
- sensitive adhesive
- polyester
- pressure
- acid
- double
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
- C09J175/06—Polyurethanes from polyesters
-
- 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
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
- C08G18/4205—Polycondensates having carboxylic or carbonic ester groups in the main chain containing cyclic groups
- C08G18/423—Polycondensates having carboxylic or carbonic ester groups in the main chain containing cyclic groups containing cycloaliphatic groups
- C08G18/4233—Polycondensates having carboxylic or carbonic ester groups in the main chain containing cyclic groups containing cycloaliphatic groups derived from polymerised higher fatty acids or alcohols
-
- 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
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
- C08G18/4266—Polycondensates having carboxylic or carbonic ester groups in the main chain prepared from hydroxycarboxylic acids and/or lactones
- C08G18/428—Lactides
-
- 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
- C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
- C08G63/60—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from the reaction of a mixture of hydroxy carboxylic acids, polycarboxylic acids and polyhydroxy compounds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J167/00—Adhesives based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Adhesives based on derivatives of such polymers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/10—Adhesives in the form of films or foils without carriers
-
- 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
- C08G2170/00—Compositions for adhesives
- C08G2170/40—Compositions for pressure-sensitive adhesives
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
- C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2467/00—Presence of polyester
Definitions
- the present invention relates to a double-sided pressure-sensitive adhesive sheet.
- Patent Documents 1 and 2 Conventionally, when bonding optical members such as lenses (glass lenses, plastic lenses, etc.), prisms, reflectors, compensation plates, polarizing plates, etc., double-sided adhesive sheets and films using acrylic adhesives have been used. Many have been used (Patent Documents 1 and 2).
- acrylic adhesives and the like have been mainly used as the adhesive material used for the double-sided adhesive sheet and the like, and the adhesive has been manufactured using fossil resources (petroleum etc.).
- an object of the present invention is to provide a double-sided pressure-sensitive adhesive sheet that uses plant-derived materials, is gentle to the global environment, can reduce adherend selectivity, and exhibits stable adhesion to the adherend.
- the double-sided pressure-sensitive adhesive sheet of the present invention is a pressure-sensitive adhesive formed from a polyester-based pressure-sensitive adhesive composition containing at least a polyester containing a lactic acid unit, a dibasic acid unit, and a glycol unit, a tackifier resin, and a crosslinking agent.
- a double-sided PSA sheet comprising a layer, wherein the dibasic acid unit contains dimer acid, and the polyester has a glass transition temperature when measured at a heating rate of 20 ° C./min using a differential scanning calorimeter.
- the weight average molecular weight is 20,000 to 200,000
- the hydroxyl value of the polyester is 1 to 60 mgKOH / g
- 10 parts of tackifying resin is added to 100 parts by weight of the polyester.
- the gel fraction of the pressure-sensitive adhesive layer is 50-90% by weight.
- the polyester contains 10 to 50 mol% of the lactic acid unit, contains 50 to 90 mol% of components other than the lactic acid unit, and a molar ratio of the dibasic acid unit to the glycol unit. Is preferably 1: 0.8 to 1: 1.2.
- the dibasic acid unit preferably further contains an aliphatic dibasic acid other than dimer acid.
- the polyester contains a trifunctional or higher carboxylic acid and / or polyol as a component other than the lactic acid unit, dibasic acid unit, and glycol unit, and the degree of dispersion of the polyester (Mw / Mn) is preferably 2.5 to 10.0.
- the acid value of the polyester is preferably 5 mgKOH / g or less.
- the cross-linking agent is preferably a polyvalent isocyanurate.
- the tackifier resin is preferably obtained from a plant-derived raw material.
- the present invention uses, for a double-sided pressure-sensitive adhesive sheet, a polyester-based pressure-sensitive adhesive composition in which a specific polyester using plant-derived raw materials such as lactic acid or dibasic acid is blended with a crosslinking agent or a specific amount of tackifying resin.
- a polyester-based pressure-sensitive adhesive composition in which a specific polyester using plant-derived raw materials such as lactic acid or dibasic acid is blended with a crosslinking agent or a specific amount of tackifying resin.
- the polyester used for the double-sided pressure-sensitive adhesive sheet of the present invention contains at least a lactic acid unit, a dibasic acid unit, and a glycol unit. In addition, it does not specifically limit as a synthesis method of polyester, A well-known polymerization method can be used.
- the double-sided PSA sheet referred to in the present invention is not limited to a sheet shape, and includes a film shape and a tape shape.
- the lactic acid unit is not particularly limited, and examples thereof include L-lactide, D-lactide, DL-lactide, meso-lactide, L-lactic acid, D-lactic acid and DL-lactic acid.
- DL-lactide is preferable from the viewpoint of the efficiency of the polymerization reaction and the solubility in a solvent. By copolymerizing these lactic acid units, a polyester having desired properties can be obtained.
- the lactic acid unit can be used alone or in combination of two or more.
- the lactic acid unit is preferably contained in the polyester component in an amount of 10 to 50 mol%, more preferably 15 to 45 mol%. If it is less than 10 mol%, the elastic modulus of the pressure-sensitive adhesive layer using the polyester is lowered, and the pressure-sensitive adhesive properties of the pressure-sensitive adhesive may change over time. On the other hand, if it exceeds 50 mol%, the glass transition temperature (Tg) of the polyester is increased, which may cause a decrease in adhesive properties, which is not preferable.
- Tg glass transition temperature
- the components other than the lactic acid unit are preferably contained in the polyester component in an amount of 50 to 90 mol%, and more preferably 55 to 85 mol%. If it is less than 50 mol%, the adhesive properties of the pressure-sensitive adhesive using the polyester will be reduced, and if it exceeds 90 mol%, the cohesive force of the pressure-sensitive adhesive using the polyester will be reduced. The adhesive (adhesive) force with a support or the like may decrease, which is not preferable.
- the dibasic acid unit contains dimer acid. Further, as the dimer acid unit, hydrogenated dimer acid may be used. By copolymerizing these dibasic acid units, a polyester having excellent adhesive properties can be obtained.
- the dibasic acid unit can be used alone or in combination of two or more.
- the dibasic acid unit preferably contains an aliphatic dibasic acid other than the dimer acid.
- an aliphatic dibasic acid other than dimer acid By copolymerizing an aliphatic dibasic acid other than dimer acid, the compatibility of dimer acid and lactic acid can be improved, and it can be expected to improve solvent solubility.
- the aliphatic dibasic acid is not particularly limited, and examples thereof include polyvalent carboxylic acids, alkyl esters thereof, and acid anhydrides.
- polyvalent carboxylic acid examples include adipic acid, azelaic acid, sebacic acid, 1,4-cyclohexanedicarboxylic acid, 4-methyl-1,2-cyclohexanedicarboxylic acid, dodecenyl succinic anhydride, fumaric acid, succinic acid, dodecanedioic acid
- aliphatic and alicyclic dicarboxylic acids such as hexahydrophthalic anhydride, tetrahydrophthalic anhydride, maleic acid, maleic anhydride, itaconic acid, citraconic acid and the like can be mentioned, and sebacic acid is particularly preferable because it is obtained from plants. These can be used alone or in combination of two or more.
- an aromatic dibasic acid can be used as long as the properties of the polyester used in the double-sided pressure-sensitive adhesive sheet of the present invention are not impaired.
- the aromatic dibasic acid is not particularly limited.
- the glycol unit is not particularly limited, and for example, an aliphatic glycol can be used.
- an aliphatic glycol By using an aliphatic glycol, it is possible to increase the molecular weight of the polyester, and it is possible to improve the adhesive properties and durability of the adhesive using the polyester.
- aliphatic glycol examples include ethylene glycol, 1,2-propylene glycol, 1,3-propanediol, 2-methyl-1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 3-methyl-1,5-pentanediol, neopentyl glycol, diethylene glycol, dipropylene glycol, 2,2,4-trimethyl- 1,5-pentanediol, 2-ethyl-2-butylpropanediol, 1,9-nonanediol, 2-methyloctanediol, 1,10-decanediol, 1,4-cyclohexanedimethanol, 1,2-cyclohexane Dimethanol, etc., especially 1,3-propanediol is obtained from plants Masu
- a glycol unit other than the aliphatic glycol may be used in combination, for example, an ethylene oxide adduct and a propylene oxide adduct of bisphenol A, Examples thereof include ethylene oxide adduct and propylene oxide adduct of hydrogenated bisphenol A, polytetramethylene glycol, polypropylene glycol, polyethylene glycol, polycarbonate glycol and the like. These can be used alone or in combination of two or more.
- the molar ratio of the dibasic acid unit to the glycol unit is preferably 1: 0.8 to 1: 1.2, and more preferably 1: 0.9 to 1: 1.1.
- the molar ratio is lower than 1: 0.8 (the content ratio of glycol units is low)
- the acid value increases or the molecular weight decreases, and the ratio is higher than 1: 1.2 (the content ratio of glycol units is In the case of high)
- the molecular weight tends to be low or the adhesive property tends to be low, which is not preferable.
- the polyester further contains a tri- or higher functional carboxylic acid and / or polyol as a component other than the lactic acid unit, dibasic acid unit, and glycol unit, and the dispersity (Mw / Mn) of the polyester is It is preferably 2.5 to 10.0, more preferably 2.5 to 9.5. When the dispersity is within the above range, it is effective in improving the adhesive force and preventing the transfer of the adhesive to the adherend.
- Mw is a weight average molecular weight and Mn represents a number average molecular weight.
- the tri- or higher functional carboxylic acid is not particularly limited, and examples thereof include trimellitic acid, pyromellitic acid, benzophenone tetracarboxylic acid, biphenyl tetracarboxylic acid, ethylene glycol bis (anhydrotrimellitate), and glycerol tris. (Anhydro trimellitate) and the like.
- examples of the tri- or higher functional polyol include glycerin, trimethylolpropane, pentaerythritol, and polyglycerin.
- the tri- or higher functional carboxylic acid and / or polyol is preferably 0.01 to 10 mol%, more preferably 0.1 to 5 mol% in the polyester component from the viewpoint of reactivity.
- glycolic acid and lactones can be copolymerized (used) as long as the properties of the polyester used in the double-sided pressure-sensitive adhesive sheet of the present invention are not impaired. It is also possible to modify the molecular ends by adding or polymerizing lactones. Further, after polymerization of other components, it is also possible to add and polymerize an acid anhydride to modify the molecular terminal to a carboxyl group. These can be used alone or in combination of two or more.
- the polyester has a glass transition temperature (Tg) of ⁇ 70 to ⁇ 20 ° C., preferably ⁇ 60 to ⁇ 40 ° C. when measured with a differential scanning calorimeter at a heating rate of 20 ° C./min. . If Tg is less than ⁇ 70 ° C., the holding power may be lowered, and if it exceeds ⁇ 20 ° C., the pressure-sensitive adhesive property at room temperature of the pressure-sensitive adhesive using the polyester may be lowered.
- Tg glass transition temperature
- the weight average molecular weight of the polyester is 20,000 to 200,000, preferably 50,000 to 150,000.
- the weight average molecular weight is less than 20,000, it may cause a decrease in the adhesive strength of the pressure-sensitive adhesive using the polyester.
- it exceeds 200,000 it may cause a decrease in cohesive force or a decrease in holding power, which is not preferable.
- the polyester has a hydroxyl value of 1 to 60 mgKOH / g, preferably 2 to 40 mgKOH / g, and particularly preferably 3 to 20 mgKOH / g.
- the hydroxyl value is less than 1 mg KOH / g, the reactivity with the cross-linking agent is deteriorated, which causes a decrease in cohesive strength of the pressure-sensitive adhesive using the polyester.
- it exceeds 60 mgKOH / g there exists a possibility that water resistance may fall, and it is not preferable.
- the acid value of the polyester is preferably 5 mgKOH / g or less, more preferably 0.1 to 3 mgKOH / g. When the acid value exceeds 5 mgKOH / g, hydrolysis is accelerated and durability may be lowered, which is not preferable.
- the polyester-based pressure-sensitive adhesive composition used for the double-sided pressure-sensitive adhesive sheet of the present invention comprises a branched polyester oligomer (ii) having a hydroxyl value of 100 to 1000 mg KOH / g with respect to 50 to 100 parts by weight of the polyester (polyester (i)).
- the cohesive force is improved and effective.
- the hydroxyl value is less than 100 mgKOH / g
- the curing accelerating effect is insufficient, and when it exceeds 1000 mgKOH / g, the solubility in a general-purpose organic solvent may be deteriorated.
- the addition amount of the branched polyester oligomer (ii) is less than 1 part by weight, the curing accelerating effect becomes insufficient, and when it exceeds 50 parts by weight, the adhesive property may be impaired, which is not preferable.
- the polyester composition means a polyester alone (when only the polyester is used and no branched polyester oligomer is used), or a mixture of the polyester and the branched polyester oligomer.
- the pressure-sensitive adhesive composition means a composition in which an additive such as a crosslinking agent is blended with the polyester composition.
- the branched polyester oligomer (ii) has a branch in the structure, has good solubility in an organic solvent, and is relatively inexpensive in terms of economy.
- the number average molecular weight of the branched polyester oligomer (ii) is preferably 1000 to 8000, more preferably 1000 to 6000. If it is less than 1000, the adherend may be contaminated, and if it exceeds 8000, the reactivity with the crosslinking agent may be lowered, which is not preferable.
- the structure of the branched polyester oligomer (ii) is not particularly limited.
- the branched polyester oligomer (ii) preferably has a structure having a main skeleton obtained by polycondensation reaction or polyaddition reaction of an ABx type compound.
- the ABx type compound means a compound having both different functional groups A and B (organic groups).
- the ABx-type compound is a compound having a functional group that does not cause intramolecular condensation or intramolecular addition reaction but can cause intermolecular condensation or intermolecular addition reaction. Particularly preferably, those having an ester bond in the main skeleton are preferable.
- different functional groups include compounds in which the functional group A is a carboxyl group or a derivative group thereof, the functional group B is a hydroxyl group or a derivative group thereof, It is.
- ABx type compound examples include 2,2-dimethylolpropionic acid, 2,2-dimethylolbutanoic acid, 5- (2-hydroxyethoxy) isophthalic acid, 5-acetoxyisophthalic acid, and 3,5-bis.
- (2-hydroxyethoxy) benzoic acid 3,5-bis (2-hydroxyethoxy) benzoic acid methyl ester, 4,4- (4′-hydroxyphenyl) pentanoic acid, 5-hydroxycyclohexane-1,3-dicarboxylic acid
- Examples include 1,3-dihydroxy-5-carboxycyclohexane, 5- (2-hydroxyethoxy) cyclohexane-1,3-dicarboxylic acid, 1,3- (2-hydroxyethoxy) -5-carboxycyclohexane, and the like.
- 2,2-dimethylolpropionic acid and 2,2-dimethylolbutanoic acid are preferably used from the viewpoint of the versatility of the starting compound and the simplicity of the polymerization reaction step.
- the branched polyester oligomer (ii) since the branched polyester oligomer (ii) has an ester bond, it is excellent in compatibility with the polyester (i), and the transparency of these reactants (crosslinked products) tends to be increased, which is effective. .
- the branched polyester oligomer (ii) made of an aliphatic monomer is preferred because it tends to be more compatible.
- the branched polyester oligomer (ii) can be synthesized by reacting the ABx type compound alone in the presence of a condensation reaction catalyst, and can also be synthesized using a polyvalent hydroxyl group-containing compound or a polyvalent carboxylic acid. Alternatively, a compound having both a hydroxyl group and a carboxyl group can be used as a branch point of the branched polyester oligomer (ii).
- polyhydric hydroxyl group-containing compound examples include various general-purpose glycol compounds and trifunctional or higher functional hydroxyl group-containing compounds such as trimethylolpropane, pentaerythritol, and dipentaerythritol.
- examples of the polyvalent carboxylic acid include trifunctional or higher functional carboxylic acid compounds such as various dibasic acids, trimellitic acid, pyromellitic acid, and benzophenone tetracarboxylic acid.
- examples of the compound having both a hydroxyl group and a carboxyl group include glycolic acid, hydroxypivalic acid, 3-hydroxy-2-methylpropionic acid, lactic acid, glyceric acid, malic acid, and citric acid.
- the branching point of the branched polyester oligomer (ii) in addition to a polyhydric hydroxyl group-containing compound, a polyvalent carboxylic acid, or a compound having both a hydroxyl group and a carboxyl group, it can be obtained directly by a condensation reaction of a dibasic acid and a glycol compound.
- a linear (linear) polyester oligomer, a polyfunctional hydroxyl group-containing compound having three or more functional groups, or a branched polyester oligomer (iii) containing a specific functional group obtained by copolymerizing a polyvalent carboxylic acid can also be used.
- linear (linear) polyester oligomer that can be the branching point or the branched polyester oligomer (iii) containing a specific functional group
- various general dibasic acids, glycol compounds, trifunctional or higher polyvalent Carboxylic acid and polyhydric alcohol compounds can be used.
- dibasic acid examples include aliphatic dibasic acids such as succinic acid, adipic acid, azelaic acid, sebacic acid, and dodecanoic acid, terephthalic acid, isophthalic acid, orthophthalic acid, 1,2-naphthalenedicarboxylic acid, 1,6 -Aromatic dibasic acids such as naphthalenedicarboxylic acid, alicyclic dibasic acids such as 1,2-cyclohexanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, 4-methyl-1,2-cyclohexanedicarboxylic acid, etc. Can be mentioned.
- aliphatic dibasic acids such as succinic acid, adipic acid, azelaic acid, sebacic acid, and dodecanoic acid
- terephthalic acid isophthalic acid, orthophthalic acid, 1,2-naphthalenedicarboxylic acid, 1,6 -Aromatic dibasic acids such
- terephthalic acid, isophthalic acid, orthophthalic acid, 1,2-naphthalenedicarboxylic acid, and 1,6-naphthalenedicarboxylic acid are preferred from the viewpoint of heat resistance, and terephthalic acid, 1,2-naphthalenedicarboxylic acid, 1 1,6-Naphthalenedicarboxylic acid is particularly preferred.
- glycol compound examples include ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 1,2-butylene glycol, 1,3-butylene glycol, 2,3-butylene glycol, and 1,4-butylene glycol.
- examples of the trifunctional or higher polyhydric carboxylic acid and polyhydric hydroxyl group-containing compound include trimellitic acid, pyromellitic acid, benzophenone tetracarboxylic acid, glycerin, trimethylolpropane, pentaerythritol and the like.
- a method for removing water generated by the polymerization (condensation) reaction a method of azeotropic dehydration using toluene or xylene, an inert gas is blown into the reaction system, and water generated together with the inert gas, Examples thereof include a method of discharging monoalcohol out of the reaction system and a method of distilling under reduced pressure.
- polymerization catalyst used in the polymerization (condensation) reaction those used for normal polyester polymerization catalysts can be used, and are not particularly limited.
- titanium-based, tin-based, antimony-based Various metal compounds such as zinc and germanium, and strong acid compounds such as p-toluenesulfonic acid and sulfuric acid can be used.
- a long-chain hydrocarbon group having 6 or more carbon atoms into the terminal group of the branched polyester oligomer.
- a method of introducing a hydrocarbon group having 6 or more carbon atoms an addition reaction or a condensation reaction is performed on the terminal carboxyl group or hydroxyl group of a branched polyester oligomer obtained by previously synthesizing a compound having a hydrocarbon group having 6 or more carbon atoms. The method etc. are mentioned.
- Examples of such compounds include monoalcohols having a long chain alkyl group such as hexanol, octanol, decyl alcohol, undecyl alcohol, dodecyl alcohol, octanoic acid, decanoic acid, dodecanoic acid, myristic acid, palmitic acid, stearic acid. And monocarboxylic acids or methyl ester derivatives having a long-chain alkyl or alkenyl group such as oleic acid having an unsaturated group.
- a suitable catalyst such as triphenylphosphine.
- the compound having a hydrocarbon group include an anhydride compound, and specifically, dodecenyl succinic anhydride and octadecyl succinic anhydride.
- Examples of the compound having a glycidyl group include various aryl glycidyl ethers such as phenyl glycidyl ether, polyethylene glycol monogolicidyl ether, polypropylene glycol monoglycidyl ether, polytetramethylene glycol monoglycidyl ether, alkyl, alkenyl, There may be mentioned monoglycidyl ethers such as alkynyl glycidyl ether.
- the total hydroxyl value of the entire polyester composition is preferably 1 to 200 mgKOH / g, more preferably 5 to 100 mgKOH / g. If the total hydroxyl value is less than 1 mgKOH / g, the curing accelerating effect may be insufficient, and if it exceeds 200 mgKOH / g, the adhesive properties may be impaired.
- the polyester-based pressure-sensitive adhesive composition is manufactured from plant-derived raw materials.
- plant-derived raw materials are biodegradable and are said to be so-called carbon neutral, and are environmentally friendly and environmentally friendly pressure-sensitive adhesives can be obtained.
- the degree of biomass is preferably 70% or more, more preferably 80% or more.
- the degree of biomass (%) means a value obtained by calculating the ratio of the plant-derived use raw material from the weight of the plant-derived use raw material with respect to the total weight of the use raw material constituting the polyester-based pressure-sensitive adhesive composition.
- Examples of plant-derived materials include dimer acid and sebacic acid for dibasic acid components, lactic acid and the like for lactic acid components, and 1,3-propylene glycol and the like for glycol (diol) components.
- the polyester-based pressure-sensitive adhesive composition used for the double-sided pressure-sensitive adhesive sheet of the present invention contains at least a polyester containing a lactic acid unit, a dibasic acid unit, and a glycol unit, a tackifier resin, and a crosslinking agent.
- a pressure-sensitive adhesive layer can be formed by crosslinking reaction of the pressure-sensitive adhesive composition containing the cross-linking agent.
- the crosslinking agent is not particularly limited, and conventionally known crosslinking agents can be used.
- polyvalent isocyanurate, polyfunctional isocyanate, polyfunctional melamine compound, polyfunctional epoxy compound, polyfunctional Oxazoline compounds, polyfunctional aziridine compounds, metal chelate compounds, etc. can be used, especially from the viewpoint of obtaining transparency of the pressure-sensitive adhesive layer and high gel fraction, polyisocyanate and polyfunctional isocyanate It is a preferred embodiment to use a compound.
- polyvalent isocyanurate examples include hexamethylene diisocyanate polyisocyanurate. By using these, it is possible to achieve the purpose of obtaining transparency and a high gel fraction of the obtained pressure-sensitive adhesive layer, which is effective.
- Commercially available products of the polyvalent isocyanurates can also be used. Specifically, trade names “Duranate TPA-100” (manufactured by Asahi Kasei Chemicals), trade names “Coronate HK”, “Coronate HX”, “Coronate 2096”. (Nippon Polyurethane Industry Co., Ltd.). These can be used alone or in combination of two or more.
- the polyfunctional isocyanate compound is preferably a compound having at least two or more isocyanate groups in the molecule, and more preferably three or more (when the branched polyester oligomer (ii) is blended). 2 may be 2 or more.), And is not particularly limited, and specific examples include aliphatic polyisocyanates, alicyclic polyisocyanates, and aromatic polyisocyanates. These can be used alone or in combination of two or more.
- aliphatic polyisocyanates examples include 1,2-ethylene diisocyanate, 1,2-tetramethylene diisocyanate, 1,3-tetramethylene diisocyanate, tetramethylene diisocyanate such as 1,4-tetramethylene diisocyanate, Hexamethylene diisocyanates such as 2-hexamethylene diisocyanate, 1,3-hexamethylene diisocyanate, 1,4-hexamethylene diisocyanate, 1,5-hexamethylene diisocyanate, 1,6-hexamethylene diisocyanate, 2,5-hexamethylene diisocyanate 2-methyl-1,5-pentane diisocyanate, 3-methyl-1,5-pentane diisocyanate, lysine diisocyanate and the like.
- alicyclic polyisocyanates examples include isophorone diisocyanate, 1,2-cyclohexyl diisocyanate, 1,3-cyclohexyl diisocyanate, cyclohexyl diisocyanate such as 1,4-cyclohexyl diisocyanate, 1,2-cyclopentyl diisocyanate, cyclopentyl diisocyanate such as 1,3-cyclopentyl diisocyanate, hydrogenated xylylene diisocyanate, hydrogen Examples include added tolylene diisocyanate, hydrogenated diphenylmethane diisocyanate, hydrogenated tetramethylxylene diisocyanate, and 4,4′-dicyclohexylmethane diisocyanate.
- aromatic polyisocyanates examples include 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 4,4′-diphenylmethane diisocyanate, 2,4′-diphenylmethane diisocyanate, and 2, 2′-diphenylmethane diisocyanate.
- polyfunctional isocyanate compound dimers and trimers of the aliphatic polyisocyanates, alicyclic polyisocyanates, aromatic polyisocyanates, and araliphatic polyisocyanates can be used, Specifically, diphenylmethane diisocyanate dimer and trimer, reaction product of trimethylolpropane and tolylene diisocyanate, reaction product of trimethylolpropane and hexamethylene diisocyanate, polymethylene polyphenyl isocyanate, polyether Polymers such as polyisocyanate and polyester polyisocyanate are listed.
- polyfunctional isocyanate compound Commercially available products can also be used as the polyfunctional isocyanate compound.
- trimer adduct of trimethylolpropane and tolylene diisocyanate the trade name “Coronate L” (manufactured by Nippon Polyurethane Industry Co., Ltd.)
- trimer adduct of trimethylolpropane and hexamethylene diisocyanate trade name “Coronate HL” (manufactured by Nippon Polyurethane Industry Co., Ltd.) and the like can be mentioned.
- polyfunctional melamine compound examples include methylated methylol melamine and butylated hexamethylol melamine
- polyfunctional epoxy compound examples include diglycidyl aniline and glycerin diglycidyl ether. These can be used alone or in combination of two or more.
- the type and addition amount of the crosslinking agent are not particularly limited, but as the pressure-sensitive adhesive sheet used for heat-peeling, it is preferably blended so that the gel fraction of the formed pressure-sensitive adhesive layer is 50 to 90% by weight. Is blended so as to be 60 to 80% by weight. When the gel fraction is less than 50% by weight, the heat resistance tends to be reduced due to insufficient cohesive force. On the other hand, when the gel fraction exceeds 90% by weight, the adhesive strength is low, and it is difficult to fix. Absent. In order to reduce the adherend selectivity, it is important to adjust the addition amount of the tackifying resin to be blended in the pressure-sensitive adhesive composition together with the gel fraction of the pressure-sensitive adhesive layer.
- the addition amount of the said crosslinking agent it is 0.001 with respect to 100 weight part of polyester compositions (when only polyester is used and it does not use branched polyester oligomer), for example. Is preferably 20 parts by weight, more preferably 0.001 to 10 parts by weight. If the amount added is less than 0.001 part by weight, the cohesive force may not be improved when the pressure-sensitive adhesive layer is used. If the amount exceeds 20 parts by weight, the resulting pressure-sensitive adhesive layer has sufficient adhesion. Since force cannot be obtained and the adhesive strength may decrease, it is not preferable.
- a catalyst can be appropriately used in order to efficiently adjust the gel fraction of the pressure-sensitive adhesive layer used in the double-sided pressure-sensitive adhesive sheet of the present invention.
- the catalyst include tetra-n-butyl titanate, tetraisopropyl titanate, butyl tin oxide, dioctyl tin diurarate and the like.
- the addition amount of the catalyst is not particularly limited, but is preferably 0.01 to 1 part by weight with respect to 100 parts by weight of the polyester composition (polyester or a mixture of polyester and branched polyester oligomer).
- the amount is preferably 0.05 to 0.5 parts by weight. If the addition amount is less than 0.01 parts by weight, the effect of catalyst addition may not be obtained, and if it exceeds 1 part by weight, the shelf life may be significantly shortened, and the coating stability may be reduced. It is not preferable.
- a pressure-sensitive adhesive composition having a desired characteristic can be obtained.
- the tackifying resin is not particularly limited, and conventionally known ones can be used.
- terpene-based tackifying resin phenol-based tackifying resin, rosin-based tackifying resin, aliphatic petroleum Resin, aromatic petroleum resin, copolymer petroleum resin, alicyclic petroleum resin, xylene resin, epoxy tackifier resin, polyamide tackifier resin, ketone tackifier resin, elastomer tackifier resin, etc.
- a rosin-based or terpene-based tackifier resin produced from plant-derived raw materials. These can be used alone or in combination of two or more.
- terpene-based tackifier resins examples include terpene resins, terpene phenol resins, and aromatic-modified terpene resins. Specific examples include ⁇ -pinene polymers, ⁇ -pinene polymers, dipentene polymers, and the like. A terpene resin modified with phenol, aromatic, hydrogenation, or hydrocarbon can be used.
- phenolic tackifier resin specifically, condensates of various phenols such as phenol, m-cresol, 3,5-xylenol, p-alkylphenol, resorcin, and formaldehyde can be used. Furthermore, resole obtained by addition reaction of the phenols and formaldehyde under an alkali catalyst, novolak, unmodified or modified rosin obtained by condensation reaction of the phenols and formaldehyde under an acid catalyst, and these A rosin-modified phenol resin obtained by adding phenol to an rosin such as a derivative in the presence of an acid catalyst and subjecting it to thermal polymerization can be used.
- rosin-based tackifying resin examples include rosin resin, polymerized rosin resin, hydrogenated rosin resin, rosin ester resin, hydrogenated rosin ester resin, rosin phenol resin, and the like.
- rosin resin polymerized rosin resin
- hydrogenated rosin resin rosin ester resin
- hydrogenated rosin ester resin rosin phenol resin
- rosin phenol resin examples include rosin resin, polymerized rosin resin, hydrogenated rosin resin, rosin ester resin, hydrogenated rosin ester resin, rosin phenol resin, and the like.
- gum rosin wood rosin
- tall oil An unmodified rosin such as rosin (raw rosin), a hydrogenated, disproportionated, polymerized, or other chemically modified modified rosin, or a derivative thereof can be used.
- the amount of the tackifying resin added is preferably 10 to 70 parts by weight, more preferably 20 parts per 100 parts by weight of the polyester composition (the polyester or a mixture of the polyester and the branched polyester oligomer). It is ⁇ 65 parts by weight, particularly preferably 20 to 60 parts by weight. If the addition amount is less than 10 parts by weight, the desired adhesive strength may not be obtained, and the pot life effect may not be exhibited. On the other hand, if the addition amount exceeds 70 parts by weight, the crosslinking based on the contained crosslinking agent. The effect becomes insufficient, and the compatibility with the polymer component (polyester composition) is also poor, causing problems such as a decrease in adhesive strength, which is not preferable.
- the amount of the tackifying resin is adjusted, but if the amount of the tackifying resin is large, the holding power is reduced, so to suppress this, It is necessary to adjust the gel fraction of the pressure-sensitive adhesive layer to be high. However, since the adhesive force is reduced by adjusting the gel fraction to be high, in the present invention, it is important to adjust the addition amount of the tackifier resin and the gel fraction to balance them. .
- the properties of the pressure-sensitive adhesive layer (pressure-sensitive adhesive) used in the double-sided pressure-sensitive adhesive sheet of the present invention are not impaired, ultraviolet absorbers, light stabilizers, release modifiers, plasticizers, softeners, fillers, pigments and dyes
- Common additives such as coloring agents such as anti-aging agents and surfactants can be used.
- the pressure-sensitive adhesive layer is formed of the polyester-based pressure-sensitive adhesive composition.
- the polyester-based pressure-sensitive adhesive composition it is possible to obtain a pressure-sensitive adhesive layer that is friendly to the global environment and excellent in pressure-sensitive adhesive properties.
- the storage elastic modulus of the pressure-sensitive adhesive layer is preferably 1 ⁇ 10 4 to 1 ⁇ 10 7 Pa when measured under a condition of a frequency of 1 Hz at 23 ° C. using a dynamic viscoelasticity measuring device, More preferably, it is 1 ⁇ 10 5 to 1 ⁇ 10 6 Pa.
- the storage elastic modulus is less than 1 ⁇ 10 4 Pa, there arises a problem that the cohesive force and holding force of the pressure-sensitive adhesive layer are reduced.
- the storage elastic modulus exceeds 1 ⁇ 10 7 Pa, the pressure-sensitive adhesive layer becomes hard, The problem that power decreases is undesirable.
- the thickness of the pressure-sensitive adhesive layer can be appropriately selected. For example, it is preferably about 5 to 1000 ⁇ m, more preferably 20 to 500 ⁇ m, and particularly preferably about 30 to 200 ⁇ m. If the thickness of the pressure-sensitive adhesive layer is less than 5 ⁇ m, it may be difficult to obtain sufficient adhesive force and may be easily peeled off. If the thickness exceeds 1000 ⁇ m, the adhesive force may increase with time and may be difficult to peel off. It is not preferable. In addition, as an adhesive layer, any form of a single layer and a laminated body may be sufficient.
- the pressure-sensitive adhesive layer can be a double-sided pressure-sensitive adhesive sheet (pressure-sensitive adhesive layer single layer, substrate-less), and the pressure-sensitive adhesive layer is disposed on both sides of a support, It is also possible to use a double-sided pressure-sensitive adhesive sheet. In addition, if it has the range which does not impair the characteristic as a double-sided adhesive sheet of this invention, even if it has an intermediate
- the support is not particularly limited, and conventionally known ones can be used, and various supports (substrates) such as plastic films, porous materials such as paper and nonwoven fabric can be used. .
- various supports such as plastic films, porous materials such as paper and nonwoven fabric can be used.
- a plastic film when using as a surface protection use, it is a preferable aspect to use a plastic film from viewpoints, such as durability.
- the plastic film include polyethylene, polypropylene, poly-1-butene, poly-4-methyl-1-pentene, ethylene / propylene copolymer, ethylene / 1-butene copolymer, and ethylene / vinyl acetate copolymer.
- Polyolefin film such as coalescence, ethylene / ethyl acrylate copolymer, ethylene / vinyl alcohol copolymer, polyester film such as polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, polyacrylate film, polystyrene film, nylon 6, Examples thereof include polyamide films such as nylon 6,6 and partially aromatic polyamide, polyvinyl chloride film, polyvinylidene chloride film, and polycarbonate film.
- the support body which consists of polylactic acid, a cellulose, etc. which are obtained from a plant-derived raw material is used suitably.
- various additives used for ordinary adhesive tape substrates such as ultraviolet absorbers, light stabilizers, antioxidants, fillers, pigments and dyes are used. can do.
- the deformability such as the elongation may be controlled by a stretching process or the like.
- the surface of the support (base material) has a conventional surface treatment, for example, in order to enhance adhesion with various pressure-sensitive adhesive layers (including pressure-sensitive adhesive layers containing thermally expandable fine particles and a surfactant).
- Oxidation treatment by chemical or physical methods such as chromic acid treatment, ozone exposure, flame exposure, high-voltage impact exposure, ionizing radiation treatment, etc. may be applied, even if coating treatment with primer is applied Good.
- a coating treatment with a release agent such as a silicone resin or a fluorine resin may be performed.
- the thickness of the support (base material) can be appropriately selected according to the material and form thereof, but is preferably about 1 to 1000 ⁇ m, more preferably about 1 to 500 ⁇ m, and more The thickness is preferably 3 to 300 ⁇ m, and particularly preferably 5 to 250 ⁇ m. If it is not within the above range, workability and workability are lowered, which is not preferable.
- the method for forming the pressure-sensitive adhesive layer is not particularly limited.
- a pressure-sensitive adhesive composition (a pressure-sensitive adhesive composition solution obtained by dissolving a pressure-sensitive adhesive composition or a hot melt) is used as the support (base material).
- a support made of a thermoplastic resin a method of co-extrusion molding of the pressure-sensitive adhesive layer by two layers or multiple layers by an inflation method or a T-die method can be used.
- a conventionally known method can be adopted.
- roll coating, gravure coating, reverse roll coating, roll brush coating, air knife coating, spray coating examples include extrusion coating with a die coater.
- the release liner is not particularly limited, and a conventionally known release liner can be appropriately used.
- a substrate having a release coat layer formed on at least one surface of a release liner substrate can be used.
- the release liner substrate may be in any form of a single layer or a plurality of layers.
- the base material for the release liner various thin leaf bodies such as a plastic film, paper, foam, and metal foil can be used, and a plastic film is particularly preferable.
- the raw material for the plastic film include polyesters such as polyethylene terephthalate, polyolefins such as polypropylene and ethylene-propylene copolymers, and thermoplastic resins such as polyvinyl chloride.
- the thickness of the release liner substrate can be appropriately selected according to the purpose.
- the release coat layer is not particularly limited and conventionally known ones can be used.
- a coat layer made of an appropriate release agent such as a silicone-based, long-chain alkyl-based, or fluorine-based one may be provided. it can.
- the double-sided pressure-sensitive adhesive sheet of the present invention preferably has an adhesive strength at 23 ° C. with respect to a stainless steel plate, an acrylic plate or the like at a peel angle of 180 ° (for example, SUS adhesive strength or acrylic plate adhesive strength) of 9 N / 20 mm or more. More preferably, it is 20 N / 20 mm or more. If the adhesive strength is less than 9 N / 20 mm, the adhesive strength to the adherend (stainless steel plate, acrylic plate, etc.) is not sufficient, and there is a possibility that problems such as peeling during use may occur.
- a support (base material) is bonded to one pressure-sensitive adhesive surface of the pressure-sensitive adhesive layer used for the double-sided pressure-sensitive adhesive sheet (pressure-sensitive adhesive layer single layer), and the other
- the deviation distance of the bakelite plate is 2.5 mm. Or less, and more preferably 1.0 mm or less. If the displacement distance (holding force) exceeds 2.5 mm, the fixing property may be insufficient with respect to the adherend, which is not preferable.
- the double-sided pressure-sensitive adhesive sheet of the present invention has reduced adherend selectivity and exhibits excellent adhesive properties with respect to various adherends, as a conventionally well-known double-sided pressure-sensitive adhesive sheet (tape, film, roll body, etc.) It can be used widely, and it can be used particularly preferably in the application of a double-sided pressure-sensitive adhesive sheet that is re-peeled and incinerated after use because it has a small load on the global environment even if discarded after use. .
- the present invention will be described in more detail with reference to examples of the present invention.
- “parts” in the examples means “parts by weight”.
- the contents of the blending and the evaluation results are shown in Tables 1 and 2.
- combination of the polyester of Table 1 it describes in mol%
- the compounding quantity in Table 2 it has described in the weight part.
- the pressure-sensitive adhesive sheet used in Examples and the like means a pressure-sensitive adhesive layer, and a state where a polyethylene terephthalate film subjected to a release treatment is attached to both surfaces of the pressure-sensitive adhesive surface (peeled to a pressure-sensitive adhesive layer single layer). It means a double-sided separator attached state in which the treated film is attached.
- polyester A (Preparation of polyester A) In a reaction vessel equipped with a stirrer, a thermometer, and an outflow cooler, 86 parts of dimer acid, 10 parts of sebacic acid, 30 parts of 1,3-propylene glycol, 0.4 part of trimethylolpropane, and 50 parts of DL-lactide In addition, 0.014 part of tetrabutyl titanate as a polymerization catalyst and 0.014 part of tin octylate were blended, heated to 250 ° C. over 5 hours under normal pressure of nitrogen atmosphere, and then reacted for 1 hour. The distilled water was removed out of the system, and an esterification reaction was performed.
- Example 1 After 100 parts of polyester A was dissolved in a mixed solvent of 75 parts of methyl ethyl ketone (MEK) and 75 parts of ethyl acetate, 2 parts of polyisocyanurate (manufactured by Asahi Kasei Chemicals Co., Ltd., TPA-100), a tackifying resin (Rika) 20 parts of Finetech Tokushima Co., Ltd., Spaintta PCJ) was blended, and the polyethylene terephthalate film (A) (manufactured by Toray Industries, Inc.) was peel-treated so that the thickness of this mixture after drying was 100 ⁇ m (adhesive layer single layer).
- MEK methyl ethyl ketone
- TPA-100 tackifying resin
- Rika Finetech Tokushima Co., Ltd., Ricatta PCJ
- Lumirror 25S-10 25 ⁇ m thick
- the pressure-sensitive adhesive surface was bonded to the peel-treated surface of the peeled polyethylene terephthalate film (B) (Toray Industries, Lumirror 25S-10, thickness 25 ⁇ m). And left for 5 days (aging) to obtain an adhesive sheet.
- B peeled polyethylene terephthalate film
- Example 2 As a cross-linking agent, the same as Example 1 except that 8 parts of polyisocyanurate (Asahi Kasei Chemicals, TPA-100) was blended, and 60 parts of tackifier resin (Rika Finetech Tokushima, Ricutta PCJ) was blended. In this way, an adhesive sheet was obtained.
- polyisocyanurate Asahi Kasei Chemicals, TPA-100
- tackifier resin Rosa Finetech Tokushima, Ricutta PCJ
- Example 3 As a cross-linking agent, the same as Example 1 except that 4 parts of polyisocyanurate (Asahi Kasei Chemicals Corp., TPA-100) was blended and 50 parts of tackifier resin (Rika Finetech Tokushima Corp., Ricutta PCJ) was blended. In this way, an adhesive sheet was obtained.
- polyisocyanurate Asahi Kasei Chemicals Corp., TPA-100
- tackifier resin Rosika Finetech Tokushima Corp., Ricutta PCJ
- a polyester composition comprising 100 parts of polyester A and 8 parts of branched polyester oligomer (hyperbranched polymer Boltorn H40, hydroxyl value 490 mgKOH / g, weight average molecular weight 5100) is mixed in a mixed solvent of 75 parts of methyl ethyl ketone (MEK) and 75 parts of ethyl acetate.
- MEK methyl ethyl ketone
- a pressure-sensitive adhesive sheet was obtained in the same manner as in Example 1 except that 6 parts of polyisocyanurate (manufactured by Asahi Kasei Chemicals Co., Ltd., TPA-100) was added as a crosslinking agent.
- Example 1 A pressure-sensitive adhesive sheet was obtained in the same manner as in Example 1 except that 1.5 parts of polyisocyanurate (manufactured by Asahi Kasei Chemicals Corporation, TPA-100) was added as a crosslinking agent.
- polyisocyanurate manufactured by Asahi Kasei Chemicals Corporation, TPA-100
- Example 2 A pressure-sensitive adhesive sheet was obtained in the same manner as in Example 2 except that 0.1 part of dioctyltin diuralylate (manufactured by Tokyo Fine Chemicals Co., Ltd., “Environator OL-1”) was added as a crosslinking reaction catalyst.
- Example 4 A pressure-sensitive adhesive sheet was obtained in the same manner as in Example 2 except that 80 parts of a tackifier resin (Rika Finetech Tokushima Co., Ltd., Ricutter PCJ) was blended.
- polyester A 100 parts of polyester B, 60 parts of tackifier resin (Rika Finetech Tokushima, Jamaicatta PCJ), 2 polyisocyanurates (Asahi Kasei Chemicals, TPA-100) as a cross-linking agent
- tackifier resin Rosahi Kasei Chemicals, TPA-100
- 2 polyisocyanurates Asahi Kasei Chemicals, TPA-100
- a pressure-sensitive adhesive sheet was obtained in the same manner as in Example 1, except that 0.1 part of dioctyltin diuralylate (manufactured by Tokyo Fine Chemical Co., Ltd., ENBILATOR OL-1) was blended as a crosslinking reaction catalyst. .
- the blending contents and evaluation results of the polyester are shown in Table 1, and the blending contents and evaluation results of the pressure-sensitive adhesive sheet using the polyester are shown in Table 2.
- Polyester composition Polyester was dissolved in chloroform D, and the composition of the polyester was analyzed by 1 H-NMR analysis using a nuclear magnetic resonance analyzer (NMR) 400-MR manufactured by Varian.
- NMR nuclear magnetic resonance analyzer
- the number average molecular weight (Mn) and the weight average molecular weight (Mw) are polyethylene obtained by subjecting a polyester composition (polyester or a mixture of polyester and a branched polyester oligomer) to a thickness of 100 ⁇ m after drying. It was applied onto a terephthalate (PET) film and dried at 120 ° C. for 2 hours to remove the solvent. This dried product was peeled from the PET castle and used as a measurement piece. 0.01 g of the measurement piece was weighed, added to 10 g of tetrahydrofuran (THF), and left to dissolve for 24 hours.
- THF tetrahydrofuran
- Glass transition temperature of polyester A differential scanning calorimeter (device name: DSC-220, manufactured by Seiko Instruments Inc.) was used. As measurement conditions, 5 mg of a measurement sample was placed in an aluminum pan, temperature conditions: ⁇ 120 to 150 ° C., temperature increase rate: 20 ° C. The glass transition temperature (Tg: ° C.) was measured.
- a phenolphthalein indicator was added thereto and titrated with a 1.00N (normal) aqueous sodium hydroxide solution.
- the hydroxyl value (mgKOH / g) was computed by subtracting the measurement result of the blank (sample is not included) measured separately.
- Biomass degree 100 ⁇ (weight of plant-derived raw material used) / (total weight of raw material used)
- the polyethylene terephthalate (PET) film A that has been subjected to the release treatment is peeled off from the pressure-sensitive adhesive sheets of Examples and Comparative Examples, and the polyethylene terephthalate (PET) film that has not been subjected to the release treatment (Lumirror 25S-10, manufactured by Toray Industries, Inc.) , A thickness of 25 ⁇ m), cut into a length of 100 mm and a width (width) of 20 mm, and then peeled off the polyethylene terephthalate (PET) film B subjected to the above-described peeling treatment, and a stainless steel plate (Nikal Shoko Co., Ltd.) Manufactured, BA304, thickness 0.5 mm) was pasted by reciprocating a 2 kg roller once to make a test sample.
- a stainless steel plate Nikal Shoko Co., Ltd.
- the test sample was subjected to a 180 ° peel adhesive strength (adhesive strength) (N / 20 mm) with a tensile compression tester (TG-1kN, manufactured by Minebea Co., Ltd.) and a tensile speed: 300 mm / min. , Temperature: 23 ⁇ 2 ° C., humidity: 65 ⁇ 5% RH, the adhesive force when peeling the PET film and the pressure-sensitive adhesive layer not subjected to the peeling treatment from the stainless steel plate is 1 surface (the PET The adhesive strength of the film (A) surface side was a stainless steel plate). Moreover, the said PET film (B) surface side was made into the adhesive force of the adhesive force 2 surface at the time of measuring as a stainless steel plate.
- a test sample was prepared and evaluated in the same manner as the SUS adhesive strength except that an acrylic plate (manufactured by Mitsubishi Rayon Co., Acrylite, thickness 2 mm) was used instead of the stainless steel plate.
- a PET film (Toray Co., Ltd., Lumirror 25S-10, thickness 25 ⁇ m) that has not been peeled off on one side of a double-sided PSA sheet (adhesive layer alone) with a thickness of 100 ⁇ m is moved back and forth once with a 2 kg pressure roller.
- a bakelite plate (thickness 1 mm) is mounted on the surface of the pressure-sensitive adhesive layer opposite to the PET film so that the adhesion area is 10 mm ⁇ 20 mm, and the roller is reciprocated once at 2 kg pressure.
- bonded (bonded) to obtain a test sample.
- the test sample was allowed to stand in an atmosphere of 23 ° C. for 24 hours, then further left at 40 ° C. for 1 hour, and then subjected to a load of 500 g and the deviation distance (mm) when left at 40 ° C. for 1 hour. It was measured.
- the gel fraction value of the pressure-sensitive adhesive layer is included in the desired range, and the adhesive strength and holding force for SUS and the like are also included in the desired range. It was confirmed that the adhesive properties were good.
- the degree of biomass was as high as 89 to 97% by weight, confirming that it was easy to substitute for plant-derived materials that are kind to the global environment and are so-called carbon neutral.
- Comparative Example 1 since the addition amount of the crosslinking agent is small, the gel fraction of the pressure-sensitive adhesive layer cannot obtain a desired value, and cohesive failure occurs at the time of measuring the adhesive strength against SUS, etc. It was confirmed that the holding power was inferior to that of the test sample, the test sample itself dropped, and a stable adhesive force could not be obtained.
- Comparative Example 2 the crosslinking reaction proceeds too much due to the addition of a crosslinking reaction catalyst, etc., the gel fraction of the pressure-sensitive adhesive layer exceeds the desired range, and the adhesive strength against SUS, etc., becomes smaller and stable adhesive strength. It was confirmed that was not obtained. In Comparative Example 3, no tackifying resin is contained.
- Comparative Example 4 the amount of tackifying resin added is larger than a predetermined amount, so that the adhesive strength against SUS or the like is reduced. Also, it was confirmed that the holding power was inferior, the test sample itself dropped, and a stable adhesive force could not be obtained.
- Comparative Example 5 since a polyester not using a dibasic acid was used, the adhesive strength against SUS or the like showed a very small value, the holding power was inferior, the test sample itself dropped, and stable adhesion. It was confirmed that power could not be obtained. Furthermore, the biomass degree was as small as 67% by weight, and it was not possible to substitute for a plant-derived material that is carbon neutral.
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Abstract
Description
1,2-シクロヘキシルジイソシアネート、1,3-シクロヘキシルジイソシアネート、1,4-シクロヘキシルジイソシアネートなどのシクロヘキシルジイソシアネート、1,2-シクロペンチルジイソシアネート、1,3-シクロペンチルジイソシアネートなどのシクロペンチルジイソシアネート、水素添加キシリレンジイソシアネート、水素添加トリレンジイソシアネート、水素添加ジフェニルメタンジイソシアネート、水素添加テトラメチルキシレンジイソシアネート、4,4’-ジシクヘキシルメタンジイソシアネートなどが挙げられる。
本発明の両面粘着シートは、23℃におけるステンレス板や、アクリル板等に対する剥離角度180°での粘着力(対SUS粘着力や、対アクリル板粘着力など)が、9N/20mm以上が好ましく、より好ましくは、20N/20mm以上である。前記粘着力が9N/20mm未満であると、被着体(ステンレス板や、アクリル板等)に対する粘着力が十分ではなく、使用中に剥離するなどの不具合が生じる恐れがあり、好ましくない。
また、本発明の両面粘着シートの保持力としては、前記両面粘着シート(粘着剤層単層)に用いられる粘着剤層の一方の粘着面に、支持体(基材)を貼り合せ、もう一方の粘着面に接着面積が10mm×20mmになるようにベークライト板を貼り合せた状態で、500gの荷重をかけて、40℃×1時間放置した際の、前記ベークライト板のズレ距離が2.5mm以下であることが好ましく、より好ましくは、1.0mm以下である。前記ズレ距離(保持力)が2.5mmを超えると、被着体に対して、固定性に欠ける恐れがあり、好ましくない。
撹拌機、温度計、流出用冷却機を装備した反応缶内に、ダイマー酸86部、セバシン酸10部、1,3-プロピレングリコール30部、トリメチロールプロパン0.4部、DL-ラクチド50部、及び重合触媒であるテトラブチルチタネートを0.014部、オクチル酸錫を0.014部配合し、窒素雰囲気の常圧下で、5時間かけて250℃まで昇温させた後、1時間反応させ、留出する水を系外に除去し、エステル化反応を行った。更に、30分かけて、10mmHgまで減圧し、250℃で30分間、初期重合を行った。更に、1mmHgまで30分間かけて減圧し、250℃で、後期重合を行い、ポリエステルAを得た。配合及び評価結果を表1に示した。
撹拌機、温度計、流出用冷却機を装備した反応缶内に、L-ラクチド22部、DL-ラクチド15部、ε-カプロラクトン54部、エチレングリコール0.2部、及び重合触媒であるオクチル酸錫を0.026部配合し、窒素雰囲気の常圧下で、1時間かけて180℃まで昇温させた後、3時間反応させ、留出する水を系外に除去し、エステル化反応を行った。更に、10分かけて、1mmHgまで減圧し、180℃で30分間かけて減圧し、残留ラクチドの除去を行い、ポリエステルBを得た。配合及び評価結果を表1に示した。
ポリエステルA100部を、メチルエチルケトン(MEK)75部と酢酸エチル75部の混合溶媒に溶解した後、架橋剤として、多価イソシアヌレート(旭化成ケミカルズ社製、TPA-100)2部、粘着付与樹脂(理化ファインテック徳島社製、リカッタPCJ)20部を配合し、この混合物を乾燥後の厚みが100μm(粘着剤層単層)になるように、剥離処理したポリエチレンテレフタレートフィルム(A)(東レ社製、ルミラー25S-10、厚さ25μm)上に塗布し、100℃で3分間乾燥させた。その後、粘着剤層の粘着面の保護のため、剥離処理したポリエチレンテレフタレートフィルム(B)(東レ社製、ルミラー25S-10、厚さ25μm)の剥離処理面に粘着面を貼り合わせ、更に50℃で5日間放置(エージング)し、粘着シートを得た。
架橋剤として、多価イソシアヌレート(旭化成ケミカルズ社製、TPA-100)8部配合し、粘着付与樹脂(理化ファインテック徳島社製、リカッタPCJ)を60部配合した以外は、実施例1と同様の方法で、粘着シートを得た。
架橋剤として、多価イソシアヌレート(旭化成ケミカルズ社製、TPA-100)4部配合し、粘着付与樹脂(理化ファインテック徳島社製、リカッタPCJ)を50部配合した以外は、実施例1と同様の方法で、粘着シートを得た。
ポリエステルA100部と分岐型ポリエステルオリゴマー(ハイパーブランチポリマー Boltorn H40、水酸基価490mgKOH/g、重量平均分子量5100)8部からなるポリエステル組成物を、メチルエチルケトン(MEK)75部と酢酸エチル75部の混合溶媒に溶解した後、架橋剤として、多価イソシアヌレート(旭化成ケミカルズ社製、TPA-100)6部を配合した以外は、実施例1と同様の方法で、粘着シートを得た。
架橋剤として、多価イソシアヌレート(旭化成ケミカルズ社製、TPA-100)1.5部配合した以外は、実施例1と同様の方法で、粘着シートを得た。
架橋反応触媒として、ジオクチルスズジウラリレート(東京ファインケミカル社製社製、エンビライザーOL-1)を0.1部配合した以外は、実施例2と同様の方法で、粘着シートを得た。
粘着付与樹脂を配合しなかった以外は、実施例1と同様の方法で、粘着シートを得た。
粘着付与樹脂(理化ファインテック徳島社製、リカッタPCJ)を80部配合した以外は、実施例2と同様の方法で、粘着シートを得た。
ポリエステルAの代わりに、ポリエステルBを100部、粘着付与樹脂(理化ファインテック徳島社製、リカッタPCJ)を60部、架橋剤として、多価イソシアヌレート(旭化成ケミカルズ社製、TPA-100)を2部、架橋反応触媒として、ジオクチルスズジウラリレート(東京ファインケミカル社製社製、エンビライザーOL-1)を0.1部配合した以外は、実施例1と同様の方法で、粘着シートを得た。
ポリエステルをクロロホルムDに溶解し、ヴァリアン社製核磁気共鳴分析計(NMR)400-MRを用いて、1H-NMR分析を行うことにより、ポリエステルの組成を解析した。
数平均分子量(Mn)及び重量平均分子量(Mw)は、ポリエステル組成物(ポリエステル、又は、ポリエステルと分岐型ポリエステルオリゴマーを混合したもの)を乾燥後の厚みが100μmになるように、剥離処理したポリエチレンテレフタレート(PET)フィルム上に塗布し、120℃×2時間乾燥させて溶媒を除去した。この乾燥物を、PET城から剥離し、これを測定片とした。測定片0.01gを秤量して、テトラヒドロフラン(THF)10gに添加し、24時間放置して溶解した。この溶液をゲル・パーミエイション・クロマトグラフィ(GPC)法を用い、標準ポリスチレンにより作成した検量線から、それぞれの分子量を測定した。
(測定条件)
装置名:東ソー社製、HLC-8220GPC
サンプル注入量:20μl
溶離液:THF
流量(流速):0.300ml/min
測定(カラム)温度:40℃
カラム:東ソー社製、G6000H6
カラムサイズ:7.5mmID×30.0cmL
検出器:示差屈折計(RI)
示差走査熱量計(装置名:DSC-220、セイコーインスツルメント社製)を用い、測定条件として、測定試料5mgをアルミパンに入れ、温度条件:-120~150℃、昇温速度:20℃/分にて測定し、ガラス転移温度(Tg:℃)を測定した。
250ml三角フラスコに試料として、ポリエステル又はポリエステル組成物を約0.5g採取し、重量を測定した。ついで、無水酢酸と無水ピリジンを1:10(質量比)に調整・混合した溶液20.00mlを採取し、前記三角フラスコに入れ、冷却器を取り付けて、20分間、攪拌しながら還流させた後、室温まで冷却した。更に、前記三角フラスコ内に冷却器を通じてアセトン20ml、蒸留水20mlを加えた。これにフェノールフタレイン指示薬を入れて、1.00N(規定)の水酸化ナトリウム水溶液により、滴定した。なお、別途測定したブランク(試料を含まない)の測定結果を差し引き、水酸基価(mgKOH/g)を算出した。
試料として、ポリエステル又はポリエステル組成物0.2gを20mlのクロロホルムに溶解し、指示薬としてフェノールフタレインを用いて、0.1N(規定)の水酸化カリウムエタノール溶液で滴定し、酸価(mgKOH/g)を算出した。
使用原料全体の重量に対する植物由来の使用原料の重量割合を算出したものを、バイオマス度(%)として、評価した。
バイオマス度(%)=100×(植物由来の使用原料の重量)/(使用原料全体の重量)
実施例及び比較例で得られた粘着シート(粘着剤層の厚さは50μm)を5cm×5cm角に切り出した。切り出したサンプルを、重さがわかっているテフロン(登録商標)シートで包み、重量を秤量し、トルエン中に23℃で7日間放置して、サンプル中のゾル分を抽出した。その後、120℃で2時間乾燥し、乾燥後の重量を秤量した。ゲル分率を下記の式にて算出した。
ゲル分率(%)=(乾燥後の重量-テフロンシート重量)/(乾燥前の重量-テフロンシート重量)×100
実施例及び比較例の粘着シートから、前記剥離処理を行ったポリエチレンテレフタレート(PET)フィルムAを剥離し、そこに剥離処理を施していないポリエチレンテレフタレート(PET)フィルム (東レ社製、ルミラー25S-10、厚さ25μm)を貼り合せ、これを縦100mm横(幅)20mmにカットし、続いて、前記剥離処理を行ったポリエチレンテレフタレート(PET)フィルムBを剥離し、そこにステンレス板(ニッカル商工社製、BA304、厚さ0.5mm)を、2kgローラを1往復させて、貼着し、試験用サンプルとした。前記試験用サンプルを、引張圧縮試験機(ミネベア社製、TG-1kN)にて、180°ピール接着力(粘着力)(N/20mm)を、引張速度:300mm/min.、温度:23±2℃、湿度:65±5%RHにて、前記ステンレス板から、前記剥離処理を施していないPETフィルム及び粘着剤層を剥離する際の粘着力を、1面(前記PETフィルム(A)面側を、ステンレス板とした場合)の粘着力とした。
また、前記PETフィルム(B)面側を、ステンレス板として、測定した場合の粘着力
2面の粘着力とした。
上記ステンレス板に代えて、アクリル板(三菱レイヨン社製、アクリライト、厚さ2mm)を使用した以外は、上記対SUS粘着力と同様の方法にて、試験用サンプルを作製し、評価した。
厚さが100μmの両面粘着シート(粘着剤層単独)の片面に、剥離処理を施していないPETフィルム(東レ社製、ルミラー25S-10、厚さ25μm)を、2kg圧でローラを1往復して貼り合せ(圧着して)、次いで、前記粘着剤層の前記PETフィルムと反対面に、接着面積が10mm×20mmになるようにベークライト板(厚さ1mm)を、2kg圧でローラを1往復して貼り合せて(圧着して)、試験用サンプルとした。この試験用サンプルを、23℃雰囲気下で24時間放置した後、更に40℃で1時間放置した後、500gの荷重をかけて、40℃×1時間放置した際の、ズレ距離(mm)を測定した。
Claims (7)
- 少なくとも、乳酸単位、二塩基酸単位、及びグリコール単位を含有するポリエステル、粘着付与樹脂、及び架橋剤を含有するポリエステル系粘着剤組成物より形成される粘着剤層を含む両面粘着シートであって、
前記二塩基酸単位が、ダイマー酸を含有し、
前記ポリエステルが、示差走査熱量計を用いて昇温速度20℃/分で測定した際のガラス転移温度が-70~-20℃であり、重量平均分子量が2万~20万であり、
前記ポリエステルの水酸基価が、1~60mgKOH/gであり、
前記ポリエステル100重量部に対して、粘着付与樹脂を10~70重量部含有し、
前記粘着剤層のゲル分率が、50~90重量%であることを特徴とする両面粘着シート。 - 前記ポリエステルが、前記乳酸単位を10~50モル%含有し、前記乳酸単位以外の成分を50~90モル%含有し、
前記二塩基酸単位とグリコール単位のモル比が、1:0.8~1:1.2であることを特徴とする請求項1記載の両面粘着シート。 - 更に、前記二塩基酸単位が、ダイマー酸以外の脂肪族二塩基酸を含有することを特徴とする請求項1又は2に記載の両面粘着シート。
- 前記ポリエステルが、前記乳酸単位、二塩基酸単位、及びグリコール単位以外の成分として、3官能以上のカルボン酸及び/又はポリオールを含有し、
前記ポリエステルの分散度(Mw/Mn)が、2.5~10.0であることを特徴とする請求項1~3のいずれかに記載の両面粘着シート。 - 前記ポリエステルの酸価が、5mgKOH/g以下であることを特徴とする請求項1~4のいずれかに記載の両面粘着シート。
- 前記架橋剤が、多価イソシアヌレートであることを特徴とする請求項1~5のいずれかに記載の両面粘着シート。
- 前記粘着付与樹脂が、植物由来の原料から得られるものであることを特徴とする請求項1~6のいずれかに記載の両面粘着シート。
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- 2010-10-20 EP EP10824963.2A patent/EP2492324A4/en not_active Withdrawn
- 2010-10-20 CN CN201080042578.3A patent/CN102575130B/zh active Active
- 2010-10-20 US US13/502,178 patent/US20120208955A1/en not_active Abandoned
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104080872A (zh) * | 2012-01-19 | 2014-10-01 | 琳得科株式会社 | 粘接片、以及带有粘接片的血袋及其制造方法 |
| WO2013137109A1 (ja) * | 2012-03-16 | 2013-09-19 | 日東電工株式会社 | 粘着剤組成物、及び、粘着シート |
| JP2013216874A (ja) * | 2012-03-16 | 2013-10-24 | Nitto Denko Corp | 粘着剤組成物、及び、粘着シート |
| CN104114660A (zh) * | 2012-03-16 | 2014-10-22 | 日东电工株式会社 | 粘合剂组合物以及粘合片 |
| CN104114660B (zh) * | 2012-03-16 | 2016-10-19 | 日东电工株式会社 | 粘合剂组合物以及粘合片 |
| US9902886B2 (en) | 2012-03-16 | 2018-02-27 | Nitto Denko Corporation | Pressure-sensitive adhesive composition and pressure-sensitive adhesive sheet |
| WO2021117826A1 (ja) * | 2019-12-13 | 2021-06-17 | Dic株式会社 | 粘着テープ |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2011088961A (ja) | 2011-05-06 |
| US20120208955A1 (en) | 2012-08-16 |
| JP5368249B2 (ja) | 2013-12-18 |
| CN102575130A (zh) | 2012-07-11 |
| EP2492324A4 (en) | 2014-10-01 |
| EP2492324A1 (en) | 2012-08-29 |
| CN102575130B (zh) | 2014-04-02 |
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