WO2024203233A1 - 粘着シートの製造方法 - Google Patents
粘着シートの製造方法 Download PDFInfo
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- WO2024203233A1 WO2024203233A1 PCT/JP2024/009358 JP2024009358W WO2024203233A1 WO 2024203233 A1 WO2024203233 A1 WO 2024203233A1 JP 2024009358 W JP2024009358 W JP 2024009358W WO 2024203233 A1 WO2024203233 A1 WO 2024203233A1
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- polyester
- sensitive adhesive
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- acrylate
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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
- 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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L51/003—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
- C08L75/04—Polyurethanes
- C08L75/14—Polyurethanes having carbon-to-carbon unsaturated bonds
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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
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
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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
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/08—Macromolecular additives
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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
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
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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
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
Definitions
- the present invention relates to a method for producing an adhesive sheet.
- Adhesives have been used in various technical fields for a long time. In addition to acrylic adhesives, polyester adhesives are also being considered for use as such adhesives from the perspective of optimizing adhesive strength, etc.
- One way to reduce the environmental impact is to reduce the amount of solvent used.
- the base polymer e.g., polyester resin
- This can lead to poor coating properties, partly due to the low molecular weight of the base polymer.
- the present invention has been made to solve the above-mentioned problems of the conventional art, and its purpose is to provide a method for producing an adhesive sheet containing a polyester-based adhesive that can contribute to reducing the environmental load, and that can form an adhesive layer while preventing poor coating of the polyester-based adhesive.
- a method for producing a pressure-sensitive adhesive sheet includes a coating step of coating a substrate with a polyester-based pressure-sensitive adhesive to form a coating layer, a primary curing step of curing the coating layer with active energy rays to form a primary cured layer, and a secondary curing step of further curing the primary cured layer by heating after the primary curing step, wherein the polyester-based pressure-sensitive adhesive includes a polyester-based resin, a crosslinking agent, an acrylic resin composition, and a photoreaction initiator, and the acrylic resin composition includes an acrylic resin and a monomer component constituting the acrylic resin.
- the polyester-based pressure-sensitive adhesive may further contain a polyfunctional acrylic monomer.
- the polyester-based pressure-sensitive adhesive may be substantially free of an organic solvent.
- the content of the photoreaction initiator may be 0.001 parts by weight or more per 100 parts by weight of the polyester resin.
- the polyester-based pressure-sensitive adhesive may further contain a crosslinking catalyst.
- the heating temperature in the secondary curing step may be 90° C. to 150° C.
- the present invention provides a method for producing an adhesive sheet containing a polyester-based adhesive that can contribute to reducing the environmental impact, and can form an adhesive layer while preventing poor coating of the polyester-based adhesive.
- FIG. 1A and 1B are schematic cross-sectional views of a pressure-sensitive adhesive sheet produced by a pressure-sensitive adhesive sheet producing method according to one embodiment of the present invention.
- A. Manufacturing Method of Pressure-Sensitive Adhesive Sheet includes a coating step of coating a polyester-based pressure-sensitive adhesive on a substrate to form a coating layer, a primary curing step of curing the coating layer with active energy rays to form a primary cured layer, and a secondary curing step of further curing the primary cured layer by heating after the primary curing step.
- polyester-based adhesive contains a polyester resin, a crosslinking agent, an acrylic resin composition, and a photoinitiator.
- the acrylic resin composition contains an acrylic resin and a monomer component constituting the acrylic resin.
- the present invention is advantageous in that it can prevent coating defects as described above while using a polyester resin with a low molecular weight.
- a polyester resin with a low molecular weight By using a polyester resin with a low molecular weight, the amount of organic solvent added can be reduced, resulting in a polyester adhesive with a low environmental impact.
- the polyester-based adhesive is substantially free of organic solvents.
- a polyester-based adhesive with low environmental impact can be provided.
- the concept of “substantially free of organic solvents" may include aspects in which a small amount of organic solvent inevitably present in the raw materials or unintentionally mixed in during production is included.
- the amount of unintentionally included organic solvent is preferably 3 parts by weight or less per 100 parts by weight of the polyester-based adhesive, preferably 1 part by weight or less, more preferably 0.5 parts by weight or less, and particularly preferably 0.1 parts by weight or less.
- coating defects such as so-called repelling may occur when the adhesive is applied to a substrate (such as a release liner) and cured by heating. In the present invention, however, such coating defects can be prevented by performing primary curing as described above.
- the viscosity of the polyester-based adhesive at 25°C is preferably 2 Pa ⁇ s to 80 Pa ⁇ s, more preferably 4 Pa ⁇ s to 60 Pa ⁇ s, and even more preferably 5 Pa ⁇ s to 50 Pa ⁇ s. Within this range, a polyester-based adhesive with excellent coatability can be obtained.
- viscosity refers to the viscosity at 0.1 to 1000 (1/s) measured using a rheometer.
- the polyester resin is obtained by reacting a polycarboxylic acid component with a polyhydric alcohol component.
- the polycarboxylic acid component includes one or more compounds selected from polycarboxylic acids having two or more carboxyl groups in one molecule and their derivatives.
- the polyhydric alcohol component includes one or more compounds selected from polyhydric alcohols having two or more hydroxyl groups in one molecule.
- the polyester resin is a biopolyester resin.
- a biopolyester resin refers to a polyester resin in which at least one of the polyvalent carboxylic acid component and the polyhydric alcohol component is derived from a plant.
- polyvalent carboxylic acid examples include aliphatic or alicyclic dibasic acids. Specific examples include adipic acid, azelaic acid, dimer acid, sebacic acid, 1,4-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, 1,2-cyclohexanedicarboxylic acid, 4-methyl-1,2-cyclohexanedicarboxylic acid, dodecenylsuccinic anhydride, fumaric acid, succinic acid, dodecanedioic acid, hexahydrophthalic anhydride, tetrahydrophthalic anhydride, maleic acid, maleic anhydride, itaconic acid, and citraconic acid.
- adipic acid azelaic acid, dimer acid, sebacic acid
- 1,4-cyclohexanedicarboxylic acid 1,3-cyclohexanedicarboxylic acid
- Aromatic dibasic acids may also be used. Specific examples of aromatic dibasic acids include terephthalic acid, isophthalic acid, orthophthalic acid, 1,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 4,4'-diphenyldicarboxylic acid, 2,2'-diphenyldicarboxylic acid, and 4,4'-diphenyletherdicarboxylic acid.
- Examples of the polyvalent carboxylic acid derivatives that can be used include anhydrides and alkyl esters of the above carboxylic acids (e.g., monoesters, diesters, etc., preferably monoalcohols having 1 to 3 carbon atoms).
- a polycarboxylic acid derived from a plant is used.
- polycarboxylic acids derived from a plant include dimer acid, sebacic acid, succinic acid, and glutaric acid.
- dimer acid refers to a dicarboxylic acid having a structure in which an unsaturated fatty acid is dimerized.
- a dicarboxylic acid having 36 carbon atoms and a structure in which an unsaturated fatty acid having 18 carbon atoms (oleic acid, linoleic acid, linolenic acid, etc.) is dimerized is a typical example of the dimer acid.
- the content of the plant-derived polycarboxylic acid relative to the total polycarboxylic acids in the polycarboxylic acid component is preferably 10 mol% or more, preferably 50 mol% or more, more preferably 75 mol% or more, even more preferably 90 mol% or more, and most preferably 100 mol%.
- polyhydric alcohol examples include aliphatic or alicyclic diols. Specific 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, and 1,10-decanediol.
- a polyhydric alcohol derived from a plant is used.
- examples of polyhydric alcohol derived from a plant include dimer diol, 1,3-propanediol, 1,4-butanediol, ethylene glycol, and polyoxytetramethylene glycol.
- dimer diol refers to a diol having a structure in which the carboxyl group in a dicarboxylic acid formed by dimerization of an unsaturated fatty acid is converted to a hydroxyl group (hydrogenated).
- a diol having 36 carbon atoms which corresponds to a dimer of an unsaturated fatty acid having 18 carbon atoms (oleic acid, linoleic acid, linolenic acid, etc.), is a typical example included in the above dimer diol.
- the content of the plant-derived polyhydric alcohol is preferably 50 mol% or more, more preferably 75 mol% or more, even more preferably 90 mol% or more, and most preferably 100 mol% based on the total polyhydric alcohol in the polyhydric alcohol component.
- the polyester resin can be obtained by polycondensation of a polycarboxylic acid component and a polyhydric alcohol component. More specifically, the polyester resin can be produced (synthesized) by proceeding with a condensation reaction between a carboxyl group of the polycarboxylic acid component and a hydroxyl group of the polyhydric alcohol component while removing water (condensed water) produced by the condensation reaction from the reaction system.
- Methods for removing the condensed water from the reaction system include a method of blowing an inert gas into the reaction system and removing the condensed water together with the inert gas from the reaction system, and a method of distilling off the condensed water from the reaction system under reduced pressure (reduced pressure method).
- the reduced pressure method can be preferably used because it is suitable for improving productivity by making it easy to shorten the polymerization time.
- the reaction conditions such as the reaction temperature when carrying out the condensation reaction and the degree of vacuum (pressure in the reaction system) when a vacuum method is adopted, can be any appropriate condition.
- the reaction temperature is, for example, 180°C to 260°C, and preferably 200°C to 220°C.
- the degree of vacuum is, for example, 10 kPa or less, preferably 0.1 kPa to 10 kPa, and more preferably 0.1 kPa to 4 kPa.
- any suitable polymerization catalyst may be used in the condensation reaction.
- the polymerization catalyst include titanium-based catalysts such as tetraisopropyl titanate and tetrabutyl titanate, antimony-based catalysts such as antimony trioxide, germanium-based catalysts such as germanium dioxide, and catalysts such as zinc acetate, manganese acetate, and dibutyltin oxide. These catalysts may be used alone or in combination of two or more. Among these, antimony trioxide, tetrabutyl titanate, germanium dioxide, and zinc acetate are preferably used.
- the amount of the polymerization catalyst may be any appropriate amount.
- the amount of the catalyst is preferably 0.001 mol% to 5 mol%, more preferably 0.01 mol% to 3 mol%, and even more preferably 0.1 mol% to 2 mol%, based on the total amount of the polyvalent carboxylic acid component and the polyhydric alcohol component.
- the polyester resin can be synthesized without using an organic solvent.
- the content of the polyester resin is preferably 60 parts by weight or more, more preferably 70 parts by weight or more, and even more preferably 80 parts by weight or more, per 100 parts by weight of the polyester adhesive.
- the weight average molecular weight of the polyester resin is preferably 0.2 ⁇ 10 4 to 2.0 ⁇ 10 4. Within this range, a polyester adhesive that can exhibit appropriate adhesive strength without containing a solvent can be preferably prepared.
- the weight average molecular weight of the polyester resin is more preferably 0.25 ⁇ 10 4 to 1.5 ⁇ 10 4 , and even more preferably 0.3 ⁇ 10 4 to 1.0 ⁇ 10 4. Within this range, the above-mentioned effects become significant.
- the weight average molecular weight refers to a value measured by gel permeation chromatography (GPC) in terms of polystyrene.
- the polyester-based pressure-sensitive adhesive contains a crosslinking agent.
- an isocyanate-based crosslinking agent and/or an epoxy-based crosslinking agent is used as the crosslinking agent.
- the content of the crosslinking agent is 3 parts by weight or more relative to 100 parts by weight of the polyester-based resin.
- the above-mentioned isocyanate-based crosslinking agents are compounds having an isocyanate group, and specific examples thereof include lower aliphatic polyisocyanates such as butylene diisocyanate and hexamethylene diisocyanate; alicyclic isocyanates such as cyclopentylene diisocyanate, cyclohexylene diisocyanate and isophorone diisocyanate; aromatic isocyanates such as 2,4-tolylene diisocyanate, 4,4'-diphenylmethane diisocyanate and xylylene diisocyanate; isocyanate adducts such as trimethylolpropane/tolylene diisocyanate trimer adduct (manufactured by Nippon Polyurethane Industry Co., Ltd., product name "Coronate L”), trimethylolpropane/hexamethylene diisocyanate trimer adduct (manufactured by Nippon Polyure
- the content of the isocyanate-based crosslinking agent can be set to any appropriate amount depending on the desired adhesive strength, and is preferably 3 to 30 parts by weight, and more preferably 10 to 20 parts by weight, per 100 parts by weight of the polyester-based resin.
- the above epoxy crosslinking agent is a compound having an epoxy group, and specific examples thereof include N,N,N',N'-tetraglycidyl-m-xylylenediamine, diglycidylaniline, 1,3-bis(N,N-glycidylaminomethyl)cyclohexane (manufactured by Mitsubishi Gas Chemical Company, product name "Tetrad C”), 1,6-hexanediol diglycidyl ether (manufactured by Kyoeisha Chemical Company, product name "Epolight 1600"), neopentyl glycol diglycidyl ether (manufactured by Kyoeisha Chemical Company, product name "Epolight 1500NP”), ethylene glycol diglycidyl ether (manufactured by Kyoeisha Chemical Company, product name "Epolight 40E”), propylene glycol diglycidyl ether (manufactured by Kyoeisha Chemical Company, product name "Epol
- Suitable epoxy resins include glycidyl ether (manufactured by Nippon Oil & Fats Corporation, trade name "Epiol P-200”), sorbitol polyglycidyl ether (manufactured by Nagase ChemteX Corporation, trade name "Denacol EX-611"), glycerol polyglycidyl ether (manufactured by Nagase ChemteX Corporation, trade name "Denacol EX-314”), pentaerythritol polyglycidyl ether, polyglycerol polyglycidyl ether (manufactured by Nagase ChemteX Corporation, trade name "Denacol EX-512”), sorbitan polyglycidyl ether, trimethylolpropane polyglycidyl ether, adipic acid diglycidyl ester, o-phthalic acid diglycidyl ester, trigly
- the content of the epoxy-based crosslinking agent can be set to any appropriate amount depending on the desired adhesive strength, and is typically 0.01 to 10 parts by weight, and more preferably 3 to 5 parts by weight, per 100 parts by weight of the polyester-based resin.
- the acrylic resin composition contains an acrylic resin and a monomer component constituting the acrylic resin.
- the polymerization rate of the polymer is less than 100% (e.g., 5% to 10%). Therefore, the acrylic resin composition may further contain a monomer component (raw material) constituting the remaining acrylic resin.
- the acrylic resin composition further contains a polyfunctional acrylic monomer.
- the acrylic resin composition can be prepared, for example, by adding a polyfunctional acrylic monomer to a mixture of an acrylic resin and a monomer remaining after polymerization of the acrylic resin (a monomer component (raw material) that constitutes the acrylic resin).
- the polyfunctional acrylic monomer is different from the monomer component that constitutes the acrylic resin.
- the viscosity of the acrylic resin composition is, for example, 10 Pa ⁇ s to 20 Pa ⁇ s.
- the acrylic resin is, for example, a polymer of a monomer raw material that contains an alkyl (meth)acrylate as a main monomer and a sub-monomer that is copolymerizable with the main monomer.
- the main monomer refers to a component that accounts for more than 50% by weight of the monomer composition in the monomer raw material.
- the content of the main monomer is preferably 60 parts by weight to 100 parts by weight, and more preferably 70 parts by weight to 99.5 parts by weight, relative to 100 parts by weight of the total amount of monomers in the monomer raw material.
- alkyl(meth)acrylate for example, a compound represented by the following formula (1) can be suitably used.
- CH 2 C(R 1 )COOR 2 (1)
- R 1 in the above formula (1) is a hydrogen atom or a methyl group.
- R 2 is a branched or linear alkyl group having 1 to 20 carbon atoms (hereinafter, such a range of carbon atoms may be expressed as "C1-20").
- R 2 is preferably a branched or linear C1-14 alkyl group, more preferably a branched or linear C4-14 alkyl group, and even more preferably a branched or linear C4-8 alkyl group.
- alkyl (meth)acrylates include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, s-butyl (meth)acrylate, pentyl (meth)acrylate, isopentyl (meth)acrylate, hexyl (meth)acrylate, heptyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, octyl (meth)acrylate, and isooctyl (meth)acrylate.
- alkyl (meth)acrylate examples include butyl (meth)acrylate, nonyl (meth)acrylate, isononyl (meth)acrylate, decyl (meth)acrylate, isodecyl (meth)acrylate, undecyl (meth)acrylate, lauryl (meth)acrylate, tridecyl (meth)acrylate, tetradecyl (meth)acrylate, pentadecyl (meth)acrylate, hexadecyl (meth)acrylate, heptadecyl (meth)acrylate, octadecyl (meth)acrylate, nonadecyl (meth)acrylate, and eicosyl (meth)acrylate.
- alkyl (meth)acrylates can be used alone or in combination of two or more.
- the secondary monomer having copolymerizability with the main monomer alkyl (meth)acrylate can be useful for introducing crosslinking points into the acrylic polymer and for increasing the cohesive strength of the acrylic polymer.
- the secondary monomer for example, the following functional group-containing monomer components can be used alone or in combination of two or more.
- Carboxy group-containing monomers for example, ethylenically unsaturated monocarboxylic acids such as acrylic acid (AA), methacrylic acid (MAA), crotonic acid, etc.; ethylenically unsaturated dicarboxylic acids such as maleic acid, itaconic acid, citraconic acid, etc., and their anhydrides (maleic anhydride, itaconic anhydride, etc.); Hydroxyl group-containing monomers: for example, hydroxyalkyl (meth)acrylates such as 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, and 2-hydroxybutyl (meth)acrylate; unsaturated alcohols such as vinyl alcohol and allyl alcohol; ether compounds such as 2-hydroxyethyl vinyl ether, 4-hydroxybutyl vinyl ether, and diethylene glycol monovinyl ether; Amino group-containing monomers: for example, aminoethyl
- the content of the structural units derived from the functional group-containing monomer is preferably 0.01 to 40 parts by weight, and more preferably 0.03 to 20 parts by weight, relative to 100 parts by weight of the total amount of monomers in the monomer raw material.
- copolymerization components other than the functional group-containing monomers described above can be used.
- copolymerization components include vinyl ester monomers such as vinyl acetate and vinyl propionate; aromatic vinyl compounds such as styrene, substituted styrenes ( ⁇ -methylstyrene, etc.), and vinyl toluene; cycloalkyl (meth)acrylates such as cyclohexyl (meth)acrylate, cyclopentyl di(meth)acrylate, and isobornyl (meth)acrylate; aromatic ring-containing (meth)acrylates such as aryl (meth)acrylates (e.g., phenyl (meth)acrylate), aryloxyalkyl (meth)acrylates (e.g., phenoxyethyl (meth)acrylate), and arylalkyl (meth)acrylates (e.g., benzyl (meth)acrylate); olefin monomers such as
- the copolymerization components other than these secondary monomers can be used alone or in combination of two or more.
- the amount of such other copolymerization components is, for example, 0.1 to 20 parts by weight per 100 parts by weight of the total amount of monomers in the monomer raw material.
- the polyfunctional acrylic monomer may be, for example, an acrylic monomer having at least two polymerizable functional groups (typically radically polymerizable functional groups) having an unsaturated double bond, such as a (meth)acryloyl group or a vinyl group.
- a polyfunctional acrylic monomer By using a polyfunctional acrylic monomer, the cohesive strength of the adhesive layer can be increased.
- polyfunctional acrylic monomers include ethylene glycol di(meth)acrylate, propylene glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, polypropylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate, pentaerythritol di(meth)acrylate, pentaerythritol tri(meth)acrylate, dipentaerythritol hexa(meth)acrylate, 1,2-ethylene glycol di(meth)acrylate, 1,4-butanediol.
- polyhydric alcohol and (meth)acrylic acid ester examples include allyl di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, 1,9-nonanediol di(meth)acrylate, 1,12-dodecanediol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, and tetramethylolmethane tri(meth)acrylate; allyl (meth)acrylate, vinyl (meth)acrylate, divinylbenzene, epoxy acrylate, polyester acrylate, and urethane acrylate.
- preferred examples include trimethylolpropane tri(meth)acrylate, 1,6-hexanediol di(meth)acrylate, 1,9-nonanediol di(meth)acrylate, and dipentaerythritol hexa(meth)acrylate. Of these, preferred examples include dipentaerythritol hexa(meth)acrylate.
- the polyfunctional acrylic monomers can be used alone or in combination of two or more. From the standpoint of reactivity, etc., polyfunctional acrylic monomers having two or more acryloyl groups are usually preferred.
- the amount of polyfunctional acrylic monomer used is preferably 0.001 to 2 parts by weight, more preferably 0.01 to 1 part by weight, and even more preferably 0.05 to 0.5 parts by weight, per 100 parts by weight of the acrylic resin composition. If the amount is within this range, a primary cured layer with a preferred viscosity can be formed, and as a result, the effects of the present invention become more pronounced.
- the content of the acrylic resin composition is preferably 1 to 30 parts by weight, more preferably 2 to 20 parts by weight, and even more preferably 3 to 10 parts by weight, relative to 100 parts by weight of the polyester resin. Within such a range, a primary cured layer with a preferred viscosity can be formed, and as a result, the effects of the present invention become more pronounced. In one embodiment, the content of the acrylic resin composition is 20 parts by weight or less relative to 100 parts by weight of the polyester resin.
- photoreaction initiator Any suitable initiator can be used as the photoreaction initiator.
- the photoreaction initiator include ⁇ -ketol compounds such as 4-(2-hydroxyethoxy)phenyl(2-hydroxy-2-propyl)ketone, ⁇ -hydroxy- ⁇ , ⁇ '-dimethylacetophenone, 2-methyl-2-hydroxypropiophenone, and 1-hydroxycyclohexylphenylketone; acetophenone compounds such as methoxyacetophenone, 2,2-dimethoxy-2-phenylacetophenone, 2,2-diethoxyacetophenone, and 2-methyl-1-[4-(methylthio)-phenyl]-2-morpholinopropane-1; benzoin ether compounds such as benzoin ethyl ether, benzoin isopropyl ether, and anisoin methyl ether; and ketal compounds such as benzyl dimethyl ketal.
- ⁇ -ketol compounds such as 4-(2-hydroxyethoxy)phenyl(
- aromatic sulfonyl chloride compounds such as 2-naphthalenesulfonyl chloride; photoactive oxime compounds such as 1-phenone-1,1-propanedione-2-(o-ethoxycarbonyl)oxime; benzophenone compounds such as benzophenone, benzoylbenzoic acid, and 3,3'-dimethyl-4-methoxybenzophenone; thioxanthone compounds such as thioxanthone, 2-chlorothioxanthone, 2-methylthioxanthone, 2,4-dimethylthioxanthone, isopropylthioxanthone, 2,4-dichlorothioxanthone, 2,4-diethylthioxanthone, and 2,4-diisopropylthioxanthone; camphorquinone; halogenated ketones; acylphosphinoxides; acylphosphonates, etc.
- the content of the photoreaction initiator is preferably 0.001 parts by weight or more, more preferably 0.002 parts by weight or more, and even more preferably 0.005 parts by weight or more, per 100 parts by weight of polyester resin.
- the polyester-based adhesive may further contain any suitable additive as necessary.
- additives include tackifiers, plasticizers (e.g., trimellitic acid ester-based plasticizers, pyromellitic acid ester-based plasticizers, etc.), pigments, dyes, fillers, antioxidants, conductive materials, antistatic agents, UV absorbers, light stabilizers, release regulators, softeners, surfactants, flame retardants, antioxidants, etc.
- the polyester-based adhesive may further contain other resins such as acrylic resins, natural rubber resins, synthetic rubber resins, and silicone resins.
- the polyester-based adhesive contains a crosslinking catalyst.
- the crosslinking catalyst include metal complex compounds such as aluminum triacetylacetonate, iron triacetylacetonate, manganese tetraacetylacetonate, nickel tetraacetylacetonate, chromium hexaacetylacetonate, titanium tetraacetylacetonate, and cobalt tetraacetylacetonate; metal alkoxides such as aluminum ethoxide, aluminum propoxide, aluminum butoxide, titanium ethoxide, titanium propoxide, and titanium butoxide; metal salt compounds such as sodium acetate, tin octylate, lead octylate, cobalt octylate, zinc octylate, calcium octylate, lead naphthenate, cobalt naphthenate, dibutyltin dioctate, dibutyltin d
- Examples of such compounds include acidic compounds such as toluenesulfonic acid, trichloroacetic acid, phosphoric acid, monoalkyl phosphoric acid, dialkyl phosphoric acid, phosphoric acid ester of ⁇ -hydroxyethyl (meth)acrylate, monoalkyl phosphorous acid, and dialkyl phosphorous acid; acids such as p-toluenesulfonic acid, phthalic anhydride, benzoic acid, benzenesulfonic acid, dodecylbenzenesulfonic acid, formic acid, acetic acid, itaconic acid, oxalic acid, and maleic acid, as well as their ammonium salts, lower amine salts, and polyvalent metal salts; organic metal compounds such as sodium hydroxide, lithium chloride, diethylzinc, and tetra(n-butoxy)titanium; and amines such as dicyclohexylamine, triethylamine,
- the content of the crosslinking catalyst is preferably 0.01 to 1 part by weight, more preferably 0.05 to 0.8 parts by weight, and even more preferably 0.08 to 0.5 parts by weight, per 100 parts by weight of the polyester resin. If the content is within this range, a polyester adhesive that prevents coating defects can be obtained.
- the polyester-based adhesive contains a surfactant.
- a surfactant By adding a surfactant, the surface tension of the polyester-based adhesive can be adjusted to a desired value, resulting in a polyester-based adhesive with excellent coatability.
- the polyester-based adhesive contains inorganic particles.
- the inorganic particles may be inorganic particles that can impart thixotropy to the polyester-based adhesive.
- the inorganic particles include inorganic particles such as silica, titanium dioxide, bentonite, zinc oxide, talc, kaolin, mica, vermiculite, magnesium carbonate, calcium carbonate, aluminum silicate, barium silicate, calcium silicate, magnesium silicate, strontium silicate, metal tungstate, magnesium, zeolite, barium sulfate, calcined calcium sulfate, calcium phosphate, fluorapatite, hydroxyapatite, and metal soap.
- Composite particles obtained by coating particles with metal oxides or the like, and modified particles whose particle surfaces have been treated with compounds or the like may also be used.
- silica particles are preferably used, and fumed silica is more preferably used.
- the content of the inorganic particles is preferably 1 to 30 parts by weight, more preferably 3 to 20 parts by weight, and even more preferably 3 to 10 parts by weight, per 100 parts by weight of polyester resin. If the content is within this range, a polyester adhesive that prevents coating defects can be obtained.
- the method for producing a polyester-based pressure-sensitive adhesive includes mixing a polyester-based resin, a crosslinking agent, an acrylic resin, a monomer component used in polymerization of the acrylic resin (a monomer component constituting the acrylic resin), other components added as necessary (e.g., a polyfunctional acrylic monomer), and a photoreaction initiator to prepare a mixture, and the mixture is characterized in that it is substantially free of organic matter.
- the polyester resin used in the above production method is the polyester resin described in the above section A.
- the polyester resin may have a weight average molecular weight of 0.2 ⁇ 10 4 to 2.0 ⁇ 10 4 , and instead of such a polyester resin, a polyester resin having a molecular weight outside this range may be used as long as the effects of the present invention are obtained.
- the crosslinking agent, acrylic resin, polyfunctional acrylic monomer, and photoinitiator may be those described above.
- the mixture may further contain an additive (e.g., a crosslinking catalyst) as described above.
- the substrate may be made of any suitable material.
- the substrate for example, in addition to plastic film and plastic sheet, various sheet-like materials such as paper, cloth, nonwoven fabric, metal foil, or plastic laminates thereof, and laminates of plastics themselves can be used.
- plastic films and plastic sheets are most preferable from the viewpoint of handling and cost.
- the material of the plastic film can be selected as necessary from the viewpoint of strength, heat resistance, and the like.
- olefin-based resins having ⁇ -olefin as a monomer component such as polyethylene (PE), polypropylene (PP), ethylene-propylene copolymer, and ethylene-vinyl acetate copolymer (EVA); polyesters such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and polybutylene terephthalate (PBT); polyvinyl chloride (PVC); polyphenylene sulfide (PPS); amide-based resins such as polyamide (nylon) and fully aromatic polyamide (aramid); polyether ether ketone (PEEK), polyimide, polyetherimide, polystyrene, and acrylic resins can be mentioned.
- PE polyethylene
- PP polypropylene
- EVA ethylene-vinyl acetate copolymer
- PET polyethylene terephthalate
- PEN polyethylene naphthalate
- PBT polybutylene terephthalate
- the plastic film may be any of an unstretched film, a uniaxially oriented film, and a biaxially oriented film. These films may be laminated films consisting of two or more film layers, or from the viewpoint of handling, a film containing a lubricant such as inert particles may be appropriately added.
- the substrate can function as a release liner.
- the substrate may or may not be an element of the adhesive sheet. That is, the adhesive sheet may be composed of only an adhesive layer, or may include an adhesive layer and a substrate. An adhesive sheet composed of only an adhesive layer can be obtained by forming the adhesive layer and then peeling off the substrate.
- the thickness of the substrate is preferably 200 ⁇ m or less, more preferably 1 ⁇ m to 200 ⁇ m, even more preferably 5 ⁇ m to 200 ⁇ m, particularly preferably 10 ⁇ m to 200 ⁇ m, particularly preferably 20 ⁇ m to 200 ⁇ m, and most preferably 30 ⁇ m to 200 ⁇ m.
- the light transmittance of the substrate at a wavelength of 365 nm is preferably 50% or more, more preferably 80% or more, and more preferably 90% or more.
- the upper limit of the light transmittance is, for example, 98% (preferably 100%).
- the substrate may be surface-treated.
- surface treatments include corona treatment, chromate treatment, ozone exposure, flame exposure, high-voltage shock exposure, ionizing radiation treatment, and coating with a primer.
- any appropriate method can be used as a method for coating the polyester-based pressure-sensitive adhesive.
- Examples of the method for coating the polyester-based pressure-sensitive adhesive include coating methods using a die coater, a comma coater, a gravure coater, etc.
- the thickness of the coating layer is preferably 5 ⁇ m to 100 ⁇ m, more preferably 8 ⁇ m to 50 ⁇ m, and even more preferably 10 ⁇ m to 30 ⁇ m.
- the coating layer is cured with active energy rays to form a primary cured layer.
- this step promotes polymerization of the remaining monomer components in the coating layer, i.e., the "monomer components constituting the acrylic resin".
- the primary curing step produces a polymer of the acrylic resin and the polyfunctional acrylic monomer.
- active energy rays examples include gamma rays, ultraviolet rays, visible light, infrared rays (heat rays), radio waves, alpha rays, beta rays, electron beams, plasma flows, ionizing rays, and particle beams.
- ultraviolet rays are preferred.
- the irradiation with active energy rays is ultraviolet light (using a high-pressure mercury lamp with a wavelength centered at 365 nm) with an integrated light amount of 500 mJ/cm 2 to 3000 mJ/cm 2 (preferably 800 mJ/cm 2 to 2500 mJ/cm 2 ).
- the surface of the coating layer opposite the substrate is covered with an ultraviolet-transmitting film (cover release film), and then active energy rays are irradiated. In this way, curing is preferably promoted and coating defects are prevented.
- the light transmittance of the ultraviolet-transmitting film at a wavelength of 365 nm is preferably 50% or more, preferably 80% or more, and more preferably 90% or more.
- the upper limit of the light transmittance is, for example, 98% (preferably 100%).
- the thickness of the primary hardened layer is preferably 5 ⁇ m to 100 ⁇ m, more preferably 8 ⁇ m to 50 ⁇ m, and even more preferably 10 ⁇ m to 30 ⁇ m.
- a predetermined time is allowed to pass before the secondary curing step is carried out.
- damage to the cured layer when peeling off the ultraviolet-transmitting film can be prevented by carrying out secondary curing after a predetermined time has passed.
- the time between the formation of the primary cured layer and the secondary curing step is, for example, 3 to 48 hours, and preferably 5 to 12 hours.
- the primary cured layer is further cured by heating.
- a pressure-sensitive adhesive layer is formed by the secondary curing by heating.
- the heating temperature is, for example, 80°C to 160°C, and preferably 90°C to 150°C.
- the heating time is, for example, 0.5 minutes to 5 minutes, and more preferably 1 minute to 3 minutes.
- the coating in the primary curing step, is covered with a UV-transmittable film, then exposed to active energy rays, and the film is peeled off before the heating is carried out. This significantly prevents coating defects.
- a pressure-sensitive adhesive sheet in one embodiment, includes a pressure-sensitive adhesive layer formed from the polyester-based pressure-sensitive adhesive.
- Figure 1 is a schematic cross-sectional view of a pressure-sensitive adhesive sheet according to one embodiment of the present invention.
- the pressure-sensitive adhesive sheet 100 may be composed of only a pressure-sensitive adhesive layer 10 as shown in Figure 1(a), or may be composed of a substrate 20 and a pressure-sensitive adhesive layer 10 disposed on at least one side of the substrate 20 as shown in Figure 1(b).
- the thickness of the adhesive sheet is preferably 3 ⁇ m to 300 ⁇ m, more preferably 5 ⁇ m to 150 ⁇ m, and even more preferably 10 ⁇ m to 100 ⁇ m.
- the adhesive strength at 23°C when the adhesive layer of the adhesive sheet is attached to a SUS304 plate is not particularly limited and can be adjusted to an appropriate range depending on the purpose and use.
- the initial adhesive strength may be, for example, 0.5 N/20 mm or more, or 0.8 N/20 mm or more.
- An adhesive sheet exhibiting an initial adhesive strength of a predetermined value or more can adhere well to an adherend.
- the initial adhesive strength is preferably 1.0 N/20 mm or more, more preferably 1.5 N/20 mm or more, even more preferably 2.0 N/20 mm or more, may be 2.5 N/20 mm or more, may be 3.0 N/20 mm or more, may be 3.5 N/20 mm or more, 4.0 N/20 mm or more, or may be 4.5 N/20 mm or more.
- the upper limit of the initial adhesive strength is not particularly limited, and may be, for example, less than 30 N/20 mm, and from the viewpoint of making it easier to balance with other properties, may be 25 N/20 mm or less, 20 N/20 mm or less, or 15 N/20 mm or less.
- the adhesive strength refers to the adhesive strength measured by a method conforming to JIS Z 0237:2009 (lamination conditions: 1 round trip with a 2 kg roller, peel speed (tensile speed): 300 mm/min, peel angle 180°).
- the gel fraction of the above-mentioned adhesive layer is preferably 50% to 95%, more preferably 60% to 90%, and even more preferably 70% to 80%. If it is within such a range, it is possible to obtain an adhesive layer with excellent coatability and adhesiveness.
- the method for measuring the gel fraction is as follows.
- the pressure-sensitive adhesive layer is wrapped in a tetrafluoroethylene sheet and tied with a kite string (referred to as a "sample"), which is placed in a 50 ml container filled with toluene and allowed to stand for 7 days at 23° C. Thereafter, the sample (after toluene treatment) is taken out of the container and transferred to an aluminum cup, and dried in a dryer at 130° C. for 2 hours to remove the toluene, after which the weight is measured and this weight is taken as the post-immersion weight (X).
- the glass transition temperature (Tg) of the adhesive layer is preferably -100°C to 0°C, more preferably -70°C to -10°C, and even more preferably -60°C to -20°C. Within these ranges, an adhesive layer with excellent coatability and adhesive properties can be obtained.
- the Tg can be determined as the temperature corresponding to the peak top of the loss modulus G" in dynamic viscoelasticity measurement performed at a frequency of 1 Hz.
- the thickness of the adhesive layer is preferably 5 ⁇ m to 200 ⁇ m, and more preferably 10 ⁇ m to 100 ⁇ m.
- Viscosity The viscosity of the polyester-based pressure-sensitive adhesive was measured under the following conditions. Measurement device: HAAKE rheometer Cone plate: diameter 35 mm, 1°, made of titanium Shear rate: 0.1 to 1000 1/s Temperature: 25°C Gap: 0.025um
- Polyester Resin A-1 had a weight average molecular weight Mw of 4,400 and a viscosity of 10 Pa ⁇ s.
- the amounts of the dicarboxylic acid component and the diol component used were such that the hydroxyl groups contained in the diol component were 1.8 mol per 1.0 mol of the carboxyl groups contained in the dicarboxylic acid component.
- Example 1 A pressure-sensitive adhesive containing 100 parts by weight of polyester resin A-1, 5 parts by weight of acrylic resin composition B-1 containing acrylic resin, 0.01 parts by weight of dipentaerythritol hexaacrylate (DPHA), 12 parts by weight of diisocyanate (trade name "Duranate D101", manufactured by Asahi Kasei) as a crosslinking agent, 8 parts by weight of polyisocyanate (trade name "Coronate HX", manufactured by Tosoh), and 0.1 parts by weight of titanium tetraacetylacetonate as a catalyst was applied to the release-treated surface of a substrate (silicone release liner, manufactured by Mitsubishi Chemical Corporation, trade name "MRF38”) to a thickness of 20 ⁇ m, and a cover release film was attached to the surface of the coating layer to obtain a laminate.
- DPHA dipentaerythritol hexaacrylate
- Duranate D101 manufactured by Asahi Kasei
- Polyisocyanate
- This laminate was irradiated with ultraviolet light from the substrate side under conditions of illuminance: 2.5 mW/cm 2 and cumulative light quantity 2000 mJ/cm 2 , and the coating layer was photocured to form a primary cured layer, and a primary cured sheet was obtained.
- This primary cured sheet was left to stand at room temperature for 5 hours, then heated at 130° C. for 3 minutes, and then left in an atmosphere at 50° C. for 3 days to obtain a pressure-sensitive adhesive sheet. The coatability of the obtained pressure-sensitive adhesive sheet was evaluated. The results are shown in Table 1.
- Example 2 A pressure-sensitive adhesive sheet was obtained in the same manner as in Example 1, except that the standing time of the primary cured sheet was changed to 8 hours. The coatability of the obtained pressure-sensitive adhesive sheet was evaluated. The results are shown in Table 1.
- Polyester resin A-1 100 parts by weight, acrylic resin composition (composition B-1: 5 parts by weight containing acrylic resin, dipentaerythritol hexaacrylate (DPHA): 0.01 parts by weight), diisocyanate (trade name "Duranate D101", manufactured by Asahi Kasei) 12 parts by weight as a crosslinking agent, polyisocyanate (trade name "Coronate HX", manufactured by Tosoh) 8 parts by weight, titanium tetraacetylacetonate 0.1 parts by weight as a catalyst were mixed with the adhesive, which was applied to the release-treated surface of the substrate (silicone release liner, manufactured by Mitsubishi Chemical Corporation, trade name "MRF38”) to a thickness of 20 ⁇ m, and a cover release film was attached to the surface of the coating layer to obtain a laminate.
- acrylic resin composition composition B-1: 5 parts by weight containing acrylic resin, dipentaerythritol hexaacrylate (DPHA): 0.01 parts by weight
- This laminate was irradiated with ultraviolet light from the substrate side under conditions of illuminance: 2.5 mW/cm 2 and cumulative light amount 2000 mJ/cm 2 , and the adhesive layer was photocured to form a primary cured layer, and a primary cured sheet was obtained.
- This primary cured sheet was left to stand at room temperature for 5 hours, the cover release film was peeled off, and the sheet was heated at 130° C. for 1 minute and then allowed to stand in an atmosphere at 50° C. for 3 days to prepare a pressure sensitive adhesive sheet.
- Example 4 A pressure-sensitive adhesive sheet was obtained in the same manner as in Example 3, except that the time for leaving the primary cured sheet was 8 hours. The coatability of the obtained pressure-sensitive adhesive sheet was evaluated. The results are shown in Table 1.
- Polyester resin A-1 100 parts by weight of a pressure-sensitive adhesive composition containing 12 parts by weight of diisocyanate (trade name "Duranate D101", manufactured by Asahi Kasei) as a crosslinking agent, 8 parts by weight of polyisocyanate (trade name "Coronate HX", manufactured by Tosoh), and 0.1 parts by weight of titanium tetraacetylacetonate as a catalyst was applied to the release-treated surface of a polyethylene terephthalate (PET) film that had been subjected to a release treatment so that the thickness after drying was 20 ⁇ m, and the film was heated at 130° C. for 1 minute and then left in an atmosphere of 50° C. for 3 days to obtain a pressure-sensitive adhesive sheet. The coatability of the obtained pressure-sensitive adhesive sheet was evaluated. The results are shown in Table 1.
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Abstract
Description
[2]上記[1]に記載の粘着シートの製造方法において、上記ポリエステル系粘着剤が、多官能アクリル系モノマーをさらに含んでいてもよい。
[3]上記[1]または[2]に記載の粘着シートの製造方法において、ポリエステル系粘着剤が、有機溶媒を実質的に含有していなくてもよい。
[4]上記[1]から[3]のいずれかに記載の粘着シートの製造法において、光反応開始剤の含有割合が、ポリエステル系樹脂100重量部に対して、0.001重量部以上であってもよい。
[5]上記[1]から[4]のいずれかに記載の粘着シートの製造方法において、上記ポリエステル系粘着剤は、架橋触媒をさらに含んでいてもよい。
[6]上記[1]から[5]のいずれかに記載の粘着シートの製造方法において、上記二次硬化工程における加熱温度が、90℃~150℃であってもよい。
本発明の実施形態による粘着シート製造方法は、ポリエステル系粘着剤を基材に塗布して塗布層を形成する塗布工程と、該塗布層を活性エネルギー線により硬化させて一次硬化層を形成する一次硬化工程と、該一次硬化工程の後、加熱により一次硬化層をさらに硬化させる二次硬化工程とを含む。
B-1.ポリエステル系粘着剤
上記ポリエステル系粘着剤は、ポリエステル系樹脂と、架橋剤と、アクリル系樹脂組成物と、光反応開始剤とを含む。アクリル系樹脂組成物は、アクリル系樹脂と、アクリル系樹脂を構成するモノマー成分とを含む。
代表的には、ポリエステル系樹脂は、多価カルボン酸成分と、多価アルコール成分との反応により得られる。多価カルボン酸成分は、一分子中に二個以上のカルボキシル基を有する多価カルボン酸およびその誘導体から選択される一種または二種以上の化合物を含む。また、多価アルコール成分は、一分子中に二個以上の水酸基を有する多価アルコールから選択される一種または二種以上の化合物を含む。
上記のとおり、ポリエステル系粘着剤は、架橋剤を含む。1つの実施形態においては、架橋剤としては、イソシアネート系架橋剤および/またはエポキシ系架橋剤が用いられる。1つの実施形態において、架橋剤の含有割合は、ポリエステル系樹脂100重量部に対して、3重量部以上である。
上記のとおり、アクリル系樹脂組成物は、アクリル系樹脂とアクリル系樹脂を構成するモノマー成分とを含む。アクリル系樹脂組成物中、重合物の重合率は100%未満(例えば、5%~10%)である。したがって、アクリル系樹脂組成物は、残存したアクリル系樹脂を構成するモノマー成分(原料)をさらに含み得る。
CH2=C(R1)COOR2 (1)
ここで、上記式(1)中のR1は水素原子またはメチル基である。また、R2は炭素原子数が1~20の分岐状もしくは直鎖状のアルキル基(以下、このような炭素原子数の範囲を「C1-20」と表すことがある)である。R2は、好ましくは分岐状もしくは直鎖状のC1-14アルキル基であり、より好ましくは分岐状もしくは直鎖状のC4-14アルキル基であり、さらに好ましくは分岐状もしくは直鎖状のC4-8アルキル基である。
カルボキシ基含有モノマー:例えばアクリル酸(AA)、メタクリル酸(MAA)、クロトン酸等のエチレン性不飽和モノカルボン酸;マレイン酸、イタコン酸、シトラコン酸等のエチレン性不飽和ジカルボン酸およびその無水物(無水マレイン酸、無水イタコン酸等);
水酸基含有モノマー:例えば2-ヒドロキシエチル(メタ)アクリレート、2-ヒドロキシプロピル(メタ)アクリレート、3-ヒドロキシプロピル(メタ)アクリレート、2-ヒドロキシブチル(メタ)アクリレート等のヒドロキシアルキル(メタ)アクリレート類;ビニルアルコール、アリルアルコール等の不飽和アルコール類;2-ヒドロキシエチルビニルエーテル、4-ヒドロキシブチルビニルエーテル、ジエチレングルコールモノビニルエーテル等のエーテル系化合物;
アミノ基含有モノマー:例えばアミノエチル(メタ)アクリレート、N,N-ジメチルアミノエチル(メタ)アクリレート、t-ブチルアミノエチル(メタ)アクリレート;
エポキシ基含有モノマー:例えばグリシジル(メタ)アクリレート、メチルグリシジル(メタ)アクリレート、アリルグリシジルエーテル;
シアノ基含有モノマー:例えばアクリロニトリル、メタクリロニトリル;
ケト基含有モノマー:例えばジアセトン(メタ)アクリルアミド、ジアセトン(メタ)アクリレート、ビニルメチルケトン、ビニルエチルケトン、アリルアセトアセテート、ビニルアセトアセテート;
窒素原子含有環を有するモノマー:例えばN-ビニル-2-ピロリドン、N-メチルビニルピロリドン、N-ビニルピリジン、N-ビニルピペリドン、N-ビニルピリミジン、N-ビニルピペラジン、N-ビニルピラジン、N-ビニルピロール、N-ビニルイミダゾール、N-ビニルオキサゾール、N-ビニルモルホリン、N-ビニルカプロラクタム、N-(メタ)アクリロイルモルホリン;
アルコキシシリル基含有モノマー:例えば3-(メタ)アクリロキシプロピルトリメトキシシラン、3-(メタ)アクリロキシプロピルトリエトキシシラン、3-(メタ)アクリロキシプロピルメチルジメトキシシラン、3-(メタ)アクリロキシプロピルメチルジエトキシシラン;
イソシアネート基含有モノマー:(メタ)アクリロイルイソシアネート、2-(メタ)アクリロイルオキシエチルイソシアネート、m-イソプロペニル-α,α-ジメチルベンジルイソシアネート。
光反応開始剤としては、任意の適切な開始剤を用いることができる。光反応開始剤としては、例えば、4-(2-ヒドロキシエトキシ)フェニル(2-ヒドロキシ-2-プロピル)ケトン、α-ヒドロキシ-α,α’-ジメチルアセトフェノン、2-メチル-2-ヒドロキシプロピオフェノン、1-ヒドロキシシクロヘキシルフェニルケトン等のα-ケトール系化合物;メトキシアセトフェノン、2,2-ジメトキシ-2-フェニルアセトフェノン、2,2-ジエトキシアセトフェノン、2-メチル-1-[4-(メチルチオ)-フェニル]-2-モルホリノプロパン-1等のアセトフェノン系化合物;ベンゾインエチルエーテル、ベンゾインイソプロピルエーテル、アニソインメチルエーテル等のベンゾインエーテル系化合物;ベンジルジメチルケタール等のケタール系化合物;2-ナフタレンスルホニルクロリド等の芳香族スルホニルクロリド系化合物;1-フェノン-1,1―プロパンジオン-2-(o-エトキシカルボニル)オキシム等の光活性オキシム系化合物;ベンゾフェノン、ベンゾイル安息香酸、3,3’-ジメチル-4-メトキシベンゾフェノン等のベンゾフェノン系化合物;チオキサンソン、2-クロロチオキサンソン、2-メチルチオキサンソン、2,4-ジメチルチオキサンソン、イソプロピルチオキサンソン、2,4-ジクロロチオキサンソン、2,4-ジエチルチオキサンソン、2,4-ジイソプロピルチオキサンソン等のチオキサンソン系化合物;カンファーキノン;ハロゲン化ケトン;アシルホスフィノキシド;アシルホスフォナート等が挙げられる。光反応開始剤の使用量は、任意の適切な量に設定され得る。
上記ポリエステル系粘着剤は、必要に応じて、任意の適切な、添加剤をさらに含み得る。添加剤としては、例えば、粘着付与剤、可塑剤(例えば、トリメリット酸エステル系可塑剤、ピロメリット酸エステル系可塑剤等)、顔料、染料、充填剤、老化防止剤、導電材、帯電防止剤、紫外線吸収剤、光安定剤、剥離調整剤、軟化剤、界面活性剤、難燃剤、酸化防止剤等が挙げられる。また、アクリル系樹脂、天然ゴム系樹脂、合成ゴム系樹脂、シリコーン系樹脂等のその他の樹脂をさらに含んでいてもよい。
1つの実施形態においては、ポリエステル系粘着剤の製造方法は、ポリエステル系樹脂と、架橋剤と、アクリル系樹脂と、当該アクリル系樹脂の重合に用いたモノマー成分(アクリル系樹脂を構成するモノマー成分)と、必要に応じて添加されるその他の成分(例えば、多官能アクリル系モノマー)と、光反応開始剤とを混合して混合物を調製することを含み、当該混合物が有機物を実質的に含まないことを特徴とする。
上記基材は、任意の適切な材料から構成され得る。基材は、例えば、プラスチックフィルム、プラスチックシートの他、紙、布、不織布、金属箔、あるいはそれらのプラスチックラミネート体、プラスチック同士の積層体など、様々なシート状物を用いることが可能である。中でも、取り扱い性やコストの観点から、プラスチックフィルムやプラスチックシート(以下、プラスチックフィルムという)が最も好ましい。プラスチックフィルムの素材としては、強度、耐熱性などの観点から、必要に応じて選択できる。例えば、ポリエチレン(PE)、ポリプロピレン(PP)、エチレン-プロピレン共重合体、エチレン-酢酸ビニル共重合体(EVA)等のα-オレフィンをモノマー成分とするオレフィン系樹脂;ポリエチレンテレフタレート(PET)、ポリエチレンナフタレート(PEN)、ポリブチレンテレフタレート(PBT)等のポリエステル;ポリ塩化ビニル(PVC);ポリフェニレンスルフィド(PPS);ポリアミド(ナイロン)、全芳香族ポリアミド(アラミド)等のアミド系樹脂;ポリエーテルエーテルケトン(PEEK)、ポリイミド、ポリエーテルイミド、ポリスチレン、アクリル樹脂などが挙げられる。これらの素材は単独で又は2種以上組み合わせて使用することができる。また、プラスチックフィルムとしては、未延伸フィルム、1軸配向フィルム、2軸配向フィルムのいずれを用いてもよい。また、これらのフィルムは2層以上のフィルム層からなる積層フィルムでもよいし、取り扱い性の観点から、適宜、不活性粒子などの滑剤を添加したフィルムを用いてもよい。
ポリエステル系粘着剤の塗布方法としては、任意の適切な方法を用いることができる。ポリエステル系粘着剤の塗布方法としては、例えば、ダイコーター、コンマコーター、グラビアコーター等を用いた塗布方法が挙げられる。
上記のとおり、塗布層を活性エネルギー線により硬化させて一次硬化層を形成する。1つの実施形態においては、当該工程により、塗布層中の残存モノマー成分、すなわち「アクリル系樹脂を構成するモノマー成分」の重合が進む。また、ポリエステル系粘着剤が、上記多官能アクリル系モノマーを含む場合、一次硬化工程により、アクリル系樹脂と多官能アクリル系モノマーとの重合物が生成される。
上記のとおり、二次硬化工程、加熱により一次硬化層をさらに硬化させる。加熱による二次硬化により、粘着剤層が形成される。
1つの実施形態においては、上記ポリエステル系粘着剤から形成された粘着剤層を備える粘着シートが提供される。図1は、本発明の1つの実施形態による粘着シートの概略断面図である。上記粘着シート100は、図1(a)に示すように、粘着剤層10のみから構成されていてもよく、図1(b)に示すように、基材20と基材20の少なくとも片側に配置された粘着剤層10とから構成されていてもよい。
粘着剤層を約0.1g採取し、平均孔径0.2umの多孔質テトラフルオロエチレンシート(商品名「NTF1122」、日東電工株式会社製)に包んだ後、凧糸で縛り、その際の重量を測定し、該重量を浸漬前重量(Z)とした。なお、該浸漬前重量は、粘着剤層(上記で採取した粘着剤層)と、テトラフルオロエチレンシートと、凧糸の総重量である。また、テトラフルオロエチレンシートと凧糸との合計重量も測定しておき、該重量を包袋重量(Y)とする。
次に、粘着剤層をテトラフルオロエチレンシートで包み凧糸で縛ったもの(「サンプル」と称する)を、トルエンで満たした50ml容器に入れ、23℃にて7日間静置する。その後、容器からサンプル(トルエン処理後)を取り出してアルミニウム製カップに移し、130℃で2時間、乾燥機中で乾燥してトルエンを除去した後、重量を測定し、該重量を浸漬後重量(X)とする。
下記の式からゲル分率を算出する。
ゲル分率[%(重量%)]=(X-Y)/(Z-Y)×100
試料(ポリエステル系樹脂)を0.2wt%のテトラヒドロフラン(THF)溶液に調製し、室温で20時間放置した。その後、0.45μmメンブレンフィルターにてろ過し、ろ液についてGPC測定を行った。
分析装置:Waters製、Alliance
カラム:東ソー製、G7000HXL + GMHXL + GMHXL
カラム温度:40℃
溶離液:THF
流速:0.8mL/min
注入量:100uL
検出器:示差屈折計(RI)
標準試料:Agilent製、ポリスチレン(PS)
ポリエステル系粘着剤の粘度を、下記の条件にて測定した。
測定装置:HAAKE製レオメーター
コーンプレート:直径35mm、1°、チタン製
せん断速度:0.1~1000 1/s
温度:25℃
ギャップ:0.025um
実施例および比較例で得られた粘着シートの外観より、塗工性を評価した。
〇:ハジキなし
×:ハジキあり
実施例および比較例における1次硬化後の粘着シートのカバー離型フィルムを剥離した際の粘着シートの外観より、泣き別れを評価した。
○:泣き別れなし
×:泣き別れあり
攪拌機、温度計、流出用冷却機を装備した反応系内に、ジカルボン酸成分としてビス-2-ヒドロキシエチルテレフタレート(TCI製)1mol、ジオール成分としてダイマージオール(商品名「プリポール2033」、分子量534、クローダジャパン社製)1.4mol、ポリテトラメチレンエーテルグリコール(商品名「BioPTMG650」、分子量650)0.4mol、触媒としてテトラブチルチタネート0.025wt%を仕込み、3kPaに減圧し、210℃で4時間縮合重合を行い、ポリエステル樹脂A-1を得た。
このポリエステル樹脂A-1は、重量平均分子量Mwが4,400、粘度が10Pa・sであった。なお、上記のジカルボン酸成分とジオール成分との使用量は、ジカルボン酸成分に含まれるカルボキシル基1.0モルに対して、ジオール成分に含まれる水酸基が1.8モルとなる割合であった。
アクリル酸ヘプチル(HpA):99重量部、アクリル酸4-ヒドロキシブチル(4HBA):1重量部から構成されるモノマー混合物に、光反応開始剤として、1ーヒドロキシシクロヘキシルフェニルケトン(BASF製「イルガキュア184」):0.05重量部、および2,2ージメトキシー1,2ージフェニルエタンー1-オン(BASF製「イルガキュア651」):0.05重量部を添加した。この組成物に紫外線を照射して、室温における粘度が約20Pa・sとなるまで予備重合を行い、重合率が約7%のアクリル樹脂を含む組成物B-1を得た。
ポリエステル樹脂A-1:100重量部に対し、アクリル系樹脂組成物(アクリル樹脂を含む組成物B-1:5重量部、ジペンタエリスリトールヘキサアクリレート(DPHA):0.01重量部)、架橋剤としてジイソシアネート(商品名「デュラネートD101」、旭化成製)12重量部、ポリイソシアネート(商品名「コロネートHX」、東ソー製)8重量部、触媒としてチタンテトラアセチルアセトネート0.1重量部を配合した粘着剤を、基材(シリコーン系剥離ライナー、三菱ケミカル社製、商品名「MRF38」)の剥離処理面に、厚さが20μmとなるように塗布し、塗布層の表面にカバー離型フィルムを貼り合わせて積層体を得た。この積層体に、基材側から、照度:2.5mW/cm2、積算光量2000mJ/cm2の条件で紫外線照射を行い、塗布層を光硬化して一次硬化層を形成し、一次硬化シートを得た。この一次硬化シートを室温で5時間静置したのち、130℃で3分加熱後、50℃の雰囲気に3日間放置して、粘着シートを得た。得られた粘着シートの塗工性を評価した。結果を表1に示す。
一次硬化シートの静置時間を8時間としたこと以外は、実施例1と同様にして、粘着シートを得た。得られた粘着シートの塗工性を評価した。結果を表1に示す。
ポリエステル樹脂A-1:100重量部に対し、アクリル系樹脂組成物(アクリル樹脂を含む組成物B-1:5重量部、ジペンタエリスリトールヘキサアクリレート(DPHA):0.01重量部)、架橋剤としてジイソシアネート(商品名「デュラネートD101」、旭化成製)12重量部、ポリイソシアネート(商品名「コロネートHX」、東ソー製)8重量部、触媒としてチタンテトラアセチルアセトネート0.1重量部を配合した粘着剤を、基材(シリコーン系剥離ライナー、三菱ケミカル社製、商品名「MRF38」)の剥離処理面に、厚さが20μmとなるように塗布し、塗布層の表面にカバー離型フィルムを貼り合わせて積層体を得た。この積層体に、基材側から、照度:2.5mW/cm2、積算光量2000mJ/cm2の条件で紫外線照射を行い、粘着層を光硬化して一次硬化層を形成し、一次硬化シートを得た。この一次硬化シートを室温で5時間静置したのち、カバー離型フィルムを剥離して、130℃で1分加熱後、50℃の雰囲気に3日間放置して、粘着シートを作成した。
一次硬化シートの静置時間を8時間としたこと以外は、実施例3と同様にして、粘着シートを得た。得られた粘着シートの塗工性を評価した。結果を表1に示す。
ポリエステル樹脂A-1:100重量部に対し、架橋剤としてジイソシアネート(商品名「デュラネートD101」、旭化成製)12重量部、ポリイソシアネート(商品名「コロネートHX」、東ソー製)8重量部、触媒としてチタンテトラアセチルアセトネート0.1重量部を配合した粘着剤組成物を、剥離処理を施したポリエチレンテレフタレート(PET)フィルムの剥離処理面に、乾燥後の厚さが20μmとなるように塗布し、130℃で1分加熱後、50℃の雰囲気に3日間放置して、粘着シートを得た。得られた粘着シートの塗工性を評価した。結果を表1に示す。
20 基材
100 粘着シート
Claims (6)
- ポリエステル系粘着剤を基材に塗布して塗布層を形成する塗布工程と、
該塗布層を活性エネルギー線により硬化させて一次硬化層を形成する一次硬化工程と、
該一次硬化工程の後、加熱により一次硬化層をさらに硬化させる二次硬化工程とを含み、
該ポリエステル系粘着剤が、ポリエステル系樹脂と、架橋剤と、アクリル系樹脂組成物と、光反応開始剤とを含み、
該アクリル系樹脂組成物は、アクリル系樹脂と、アクリル系樹脂を構成するモノマー成分とを含む、
粘着シートの製造方法。 - 前記ポリエステル系粘着剤が、多官能アクリル系モノマーをさらに含む、請求項1に記載の粘着シートの製造方法。
- 前記ポリエステル系粘着剤が、有機溶媒を実質的に含有しない、請求項1に記載の粘着シートの製造方法。
- 前記光反応開始剤の含有割合が、ポリエステル系樹脂100重量部に対して、0.001重量部以上である、請求項1に記載の粘着シートの製造方法。
- 前記ポリエステル系粘着剤が、架橋触媒をさらに含む、請求項1に記載の粘着シートの製造方法。
- 前記二次硬化工程における加熱温度が、90℃~150℃である、請求項1に記載の粘着シートの製造方法。
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| JPH05194928A (ja) * | 1991-03-15 | 1993-08-03 | Toyo Ink Mfg Co Ltd | 光ディスク基板の貼り合わせ方法 |
| WO2011081163A1 (ja) * | 2009-12-28 | 2011-07-07 | 日東電工株式会社 | ポリエステル系粘着剤組成物 |
| JP2014169420A (ja) * | 2013-03-05 | 2014-09-18 | Nitto Denko Corp | 両面粘着テープ |
| JP2019006925A (ja) * | 2017-06-27 | 2019-01-17 | 東洋インキScホールディングス株式会社 | 感圧式接着剤及び接着フィルム |
| JP2019044024A (ja) * | 2017-08-30 | 2019-03-22 | リンテック株式会社 | 粘着シート、表示体および表示体の製造方法 |
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| JP2003238930A (ja) | 2002-02-18 | 2003-08-27 | Toyobo Co Ltd | 粘接着剤用樹脂組成物及びこれを用いた積層体 |
| JP7388054B2 (ja) | 2018-09-26 | 2023-11-29 | 三菱ケミカル株式会社 | ポリエステル系粘着剤組成物、ポリエステル系粘着剤及び粘着シート |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05194928A (ja) * | 1991-03-15 | 1993-08-03 | Toyo Ink Mfg Co Ltd | 光ディスク基板の貼り合わせ方法 |
| WO2011081163A1 (ja) * | 2009-12-28 | 2011-07-07 | 日東電工株式会社 | ポリエステル系粘着剤組成物 |
| JP2014169420A (ja) * | 2013-03-05 | 2014-09-18 | Nitto Denko Corp | 両面粘着テープ |
| JP2019006925A (ja) * | 2017-06-27 | 2019-01-17 | 東洋インキScホールディングス株式会社 | 感圧式接着剤及び接着フィルム |
| JP2019044024A (ja) * | 2017-08-30 | 2019-03-22 | リンテック株式会社 | 粘着シート、表示体および表示体の製造方法 |
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| WO2026115112A1 (de) * | 2024-11-29 | 2026-06-04 | Tesa Se | Haftklebmasse und deren herstellungsverfahren |
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