WO2022168916A1 - 粘着剤組成物、粘着シート、粘着剤組成物の製造方法、および水または水蒸気の存在を検知する方法 - Google Patents
粘着剤組成物、粘着シート、粘着剤組成物の製造方法、および水または水蒸気の存在を検知する方法 Download PDFInfo
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- WO2022168916A1 WO2022168916A1 PCT/JP2022/004266 JP2022004266W WO2022168916A1 WO 2022168916 A1 WO2022168916 A1 WO 2022168916A1 JP 2022004266 W JP2022004266 W JP 2022004266W WO 2022168916 A1 WO2022168916 A1 WO 2022168916A1
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- WIPO (PCT)
- Prior art keywords
- sensitive adhesive
- pressure
- meth
- adhesive composition
- acrylate
- Prior art date
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Images
Classifications
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- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
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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
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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
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- C09J133/08—Homopolymers or copolymers of acrylic acid esters
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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
- C09J201/00—Adhesives based on unspecified macromolecular compounds
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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
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- C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C09J7/385—Acrylic polymers
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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
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- G01N31/222—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using chemical indicators for investigating moisture content
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- C—CHEMISTRY; METALLURGY
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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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
- 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
- C09J2301/302—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 the adhesive being pressure-sensitive, i.e. tacky at temperatures inferior to 30°C
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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
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
- C09J2301/408—Additional features of adhesives in the form of films or foils characterized by the presence of essential components additives as essential feature of the adhesive layer
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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
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/50—Additional features of adhesives in the form of films or foils characterized by process specific features
Definitions
- the present invention relates to an adhesive composition, an adhesive sheet, a method for producing an adhesive composition, and a method for detecting the presence of water or water vapor.
- tapes that detect water are known, such as tapes for diapers and submersion detection tapes for smartphones and mobile phones, by applying a material that changes color with water to the base material of the tape.
- Patent Document 1 a wetness detection sheet that changes color when it gets wet and can detect water leakage is also known.
- the water wet detection sheet of Patent Document 1 does not even aim to prevent water leakage.
- an object of the present invention is to provide a pressure-sensitive adhesive composition having a water-stopping function and a water-detecting function by imparting a water-discoloring function to the pressure-sensitive adhesive itself instead of the base material.
- the present invention is as follows.
- An adhesive composition comprising a base polymer and a material discolored by water or steam.
- 2. The pressure-sensitive adhesive composition according to 1 above, further comprising a polar solvent.
- 3. The pressure-sensitive adhesive composition according to 2 above, wherein the polar solvent contains at least one of alcohol, ketone, and an aromatic compound containing a nitrogen atom in the molecule.
- 4. The pressure-sensitive adhesive composition according to any one of 1 to 3 above, wherein the base polymer comprises an acrylic polymer. 5.
- a pressure-sensitive adhesive sheet comprising a pressure-sensitive adhesive layer comprising the pressure-sensitive adhesive composition according to any one of 1 to 6 above.
- 8. The pressure-sensitive adhesive sheet according to 7 above, wherein the pressure-sensitive adhesive layer is provided on a substrate.
- 9. The pressure-sensitive adhesive sheet according to 7 or 8 above, which is used for detecting leakage of water or steam from an assumed leakage location. 10.
- a method for producing a pressure-sensitive adhesive composition comprising a base polymer and a material discolored by water or steam, dissolving a water or steam discoloring material in a polar solvent; and adding the water or steam discoloring material dissolved in the polar solvent to a base polymer solution;
- a method for producing an adhesive composition comprising: 11.
- the adhesive composition of one embodiment of the present invention has a water discoloration function. Therefore, by attaching a pressure-sensitive adhesive sheet using the pressure-sensitive adhesive composition of the present embodiment to a location where water leakage is expected, it is possible to prevent leakage of water or steam from the location and easily detect the occurrence. can do. Thus, according to the pressure-sensitive adhesive composition of the present embodiment, it is possible to exhibit both the water stop function and the water detection function at the same time.
- FIG. 1 is an example of a schematic cross-sectional view of an adhesive layer according to an embodiment of the present invention.
- FIG. 2 is an example of a schematic cross-sectional view of an adhesive sheet according to an embodiment of the present invention.
- FIG. 3 is an example of a schematic cross-sectional view of an adhesive sheet according to an embodiment of the present invention.
- a to B indicating a range means “A or more and B or less”. Further, in this specification, "weight” and “mass”, “weight %” and “mass %”, and “parts by weight” and “parts by mass” are treated as synonyms.
- the term "adhesive" refers to a soft solid (viscoelastic) state in a temperature range around room temperature, which can be easily adhered to an adherend by pressure.
- the pressure-sensitive adhesive referred to herein generally has a complex tensile modulus E * (1 Hz) ⁇ 10 7 dyne/cm 2 (typically a material having the above properties at 25° C.).
- a pressure-sensitive adhesive composition according to one embodiment of the present invention is characterized by containing a base polymer and a material discolored by water or steam.
- the base polymer constituting the pressure-sensitive adhesive composition is not particularly limited, and known polymers used for pressure-sensitive adhesives can be used.
- acrylic polymers examples include acrylic polymers, rubber polymers, vinyl alkyl ether polymers, silicone polymers, polyester polymers, polyamide polymers, urethane polymers, fluorine polymers, and epoxy polymers.
- acrylic polymers and rubber polymers are preferable from the point of adhesiveness. Further, from the viewpoint that the change in appearance when discolored is remarkable, an acrylic polymer having high transparency is more preferable.
- Such polymers may be used singly or in combination of two or more.
- the adhesive composition of one embodiment of the present invention may contain an acrylic polymer as a base polymer.
- the pressure-sensitive adhesive composition may be an acrylic pressure-sensitive adhesive composition containing an acrylic polymer as a main component.
- the acrylic pressure-sensitive adhesive composition has excellent transparency.
- the pressure-sensitive adhesive composition of one embodiment of the present invention includes, for example, 40% by weight or more of (meth)acrylic acid alkyl ester having a linear or branched alkyl group having 1 to 20 carbon atoms at the ester end.
- a base polymer it is preferable to use an acrylic polymer composed of monomer components in a ratio of
- (meth)acrylic acid alkyl ester having an alkyl group having X or more and Y or less carbon atoms at the ester end may be referred to as "(meth)acrylic acid CXY alkyl ester".
- the ratio of the (meth)acrylic acid C 1-20 alkyl ester in the total monomer components of the acrylic polymer is more than 50% by weight. It may be 55% by weight or more, 60% by weight or more, or 70% by weight or more. For the same reason, the proportion of the (meth)acrylic acid C 1-20 alkyl ester in the monomer component may be, for example, 99.9% by weight or less, 99.5% by weight or less, or 99% by weight or less. good.
- the ratio of the C 1-20 (meth)acrylic acid alkyl ester to the total monomer components of the acrylic polymer according to another aspect may be, for example, 98% by weight or less, from the viewpoint of improving the cohesiveness of the pressure-sensitive adhesive layer. It may be 95% by weight or less, 85% by weight or less (for example, less than 80% by weight), 70% by weight or less, or 60% by weight or less.
- (meth)acrylic acid C 1-20 alkyl esters include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, isopropyl (meth)acrylate, ( meth) n-butyl acrylate, isobutyl (meth) acrylate, s-butyl (meth) acrylate, t-butyl (meth) acrylate, pentyl (meth) acrylate, isopentyl (meth) acrylate, (meth) hexyl acrylate, heptyl (meth)acrylate, octyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, isooctyl (meth)acrylate, nonyl (meth)acrylate, isononyl (meth)acrylate, (meth)acrylate ) Decyl acrylate, isodecy
- At least (meth)acrylic acid C 4-20 alkyl ester it is preferable to use at least (meth)acrylic acid C 4-18 alkyl ester.
- n-butyl acrylate (BA) and 2-ethylhexyl acrylate (2EHA) as the monomer component.
- (meth)acrylic acid C 4-20 alkyl esters that can be preferably used include isononyl acrylate, n-butyl methacrylate (BMA), 2-ethylhexyl methacrylate (2EHMA), isostearyl acrylate (iSTA ) and the like.
- the monomer component constituting the acrylic polymer may contain a (meth)acrylic acid C 4-18 alkyl ester in a proportion of 40% by weight or more.
- the proportion of the (meth)acrylic acid C 4-18 alkyl ester in the monomer component may be, for example, 50% by weight or more, 60% by weight or more, or 65% by weight or more.
- a monomer component containing a (meth)acrylic acid C 6-18 alkyl ester in a ratio equal to or higher than any of the above lower limits may be used.
- the proportion of the (meth)acrylic acid C4-18 alkyl ester in the monomer component is usually suitably 99.5% by weight or less, and 95% by weight. % or less, 85 wt % or less, or 75 wt % or less. It may be a monomer component containing a (meth)acrylic acid C 6-18 alkyl ester in a proportion not higher than any of the above upper limits.
- the monomer component constituting the acrylic polymer contains (meth)acrylic acid alkyl ester and, if necessary, other monomers (copolymerizable monomers) copolymerizable with (meth)acrylic acid alkyl ester. good too.
- a monomer having a polar group such as a carboxy group, a hydroxyl group, or a nitrogen atom-containing ring, or a homopolymer having a relatively high glass transition temperature (for example, 10° C. or higher) is preferably used.
- a monomer having a polar group can be useful for introducing a cross-linking point into the acrylic polymer and increasing the cohesive strength of the pressure-sensitive adhesive.
- the copolymerizable monomers may be used singly or in combination of two or more.
- Non-limiting specific examples of copolymerizable monomers include the following.
- Carboxy group-containing monomers for example, acrylic acid, methacrylic acid, carboxyethyl acrylate, carboxypentyl acrylate, itaconic acid, maleic acid, fumaric acid, crotonic acid, isocrotonic acid, and the like.
- Acid anhydride group-containing monomers for example, maleic anhydride, itaconic anhydride.
- Hydroxyl group-containing monomers for example, 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, (meth)acrylic 4-hydroxybutyl acid, 6-hydroxyhexyl (meth)acrylate, 8-hydroxyoctyl (meth)acrylate, 10-hydroxydecyl (meth)acrylate, 12-hydroxylauryl (meth)acrylate, (4-hydroxy hydroxyalkyl (meth)acrylates such as methylcyclohexyl)methyl (meth)acrylate;
- Monomers containing sulfonic or phosphoric acid groups for example, styrenesulfonic acid, allylsulfonic acid, sodium vinylsulfonate, 2-(meth)acrylamido-2-methylpropanesulfonic acid, (meth)acrylamidopropanesulfonic acid, sulfo propyl (meth)acrylate, (meth)acryloyloxynaphthalenesulfonic acid, 2-hydroxyethyl acryloyl phosphate and the like.
- Epoxy group-containing monomers For example, epoxy group-containing acrylates such as glycidyl (meth)acrylate and 2-ethylglycidyl (meth)acrylate, allyl glycidyl ether, glycidyl ether (meth)acrylate, and the like.
- Cyano group-containing monomers for example, acrylonitrile, methacrylonitrile, and the like.
- Isocyanate group-containing monomers for example, 2-isocyanatoethyl (meth)acrylate and the like.
- Amido group-containing monomers for example, (meth)acrylamide; N,N-dimethyl(meth)acrylamide, N,N-diethyl(meth)acrylamide, N,N-dipropyl(meth)acrylamide, N,N-diisopropyl(meth) N,N-dialkyl(meth)acrylamides such as acrylamide, N,N-di(n-butyl)(meth)acrylamide, N,N-di(t-butyl)(meth)acrylamide; N-ethyl(meth)acrylamide , N-isopropyl (meth)acrylamide, N-butyl (meth)acrylamide, N-alkyl (meth)acrylamide such as Nn-butyl (meth)acrylamide; N-vinylcarboxylic acid amides such as N-vinylacetamide; monomers having a hydroxyl group and an amide group, such as N-(2-hydroxyethyl)
- Amino group-containing monomers for example, aminoethyl (meth)acrylate, N,N-dimethylaminoethyl (meth)acrylate, t-butylaminoethyl (meth)acrylate.
- Epoxy group-containing monomers for example, glycidyl (meth)acrylate, methylglycidyl (meth)acrylate, allyl glycidyl ether.
- N-vinyl-2-pyrrolidone N-methylvinylpyrrolidone, N-vinylpyridine, N-vinylpiperidone, N-vinylpyrimidine, N-vinylpiperazine, N-vinylpyrazine, N- Vinylpyrrole, N-vinylimidazole, N-vinyloxazole, N-(meth)acryloyl-2-pyrrolidone, N-(meth)acryloylpiperidine, N-(meth)acryloylpyrrolidine, N-vinylmorpholine, N-vinyl-3 -morpholinone, N-vinyl-2-caprolactam, N-vinyl-1,3-oxazin-2-one, N-vinyl-3,5-morpholinedione, N-vinylpyrazole, N-vinylisoxazole, N-vinyl thiazole, N-
- Monomers having a succinimide skeleton for example, N-(meth)acryloyloxymethylenesuccinimide, N-(meth)acryloyl-6-oxyhexamethylenesuccinimide, N-(meth)acryloyl-8-oxyhexamethylenesuccinimide and the like.
- Maleimides for example, N-cyclohexylmaleimide, N-isopropylmaleimide, N-laurylmaleimide, N-phenylmaleimide and the like.
- itaconimides for example, N-methylitaconimide, N-ethylitaconimide, N-butylitaconimide, N-octylitaconimide, N-2-ethylhexylitaconimide, N-cyclohexylitaconimide, N-laurylitaconimide and the like.
- Aminoalkyl (meth)acrylates for example, aminoethyl (meth)acrylate, N,N-dimethylaminoethyl (meth)acrylate, N,N-diethylaminoethyl (meth)acrylate, t (meth)acrylate - butylaminoethyl.
- Alkoxy group-containing monomers for example, 2-methoxyethyl (meth)acrylate, 3-methoxypropyl (meth)acrylate, 2-ethoxyethyl (meth)acrylate, propoxyethyl (meth)acrylate, (meth)acrylic acid Alkoxyalkyl (meth)acrylates (alkoxyalkyl (meth)acrylates) such as butoxyethyl and ethoxypropyl (meth)acrylate; methoxyethylene glycol (meth)acrylate, methoxypolyethylene glycol (meth)acrylate, (meth)acrylate alkoxyalkylene glycol (meth)acrylates (for example, alkoxypolyalkylene glycol (meth)acrylates) such as methoxypolypropylene glycol acrylate;
- Alkoxysilyl group-containing monomers such as 3-(meth)acryloxypropyltrimethoxysilane, 3-(meth)acryloxypropyltriethoxysilane, 3-(meth)acryloxypropylmethyldimethoxysilane, 3-(meth)acryloxy alkoxysilyl group-containing (meth)acrylates such as propylmethyldiethoxysilane; alkoxysilyl group-containing vinyl compounds such as vinyltrimethoxysilane and vinyltriethoxysilane;
- Vinyl esters For example, vinyl acetate, vinyl propionate, etc.
- Vinyl ethers For example, vinyl alkyl ethers such as methyl vinyl ether and ethyl vinyl ether.
- Aromatic vinyl compounds for example, styrene, ⁇ -methylstyrene, vinyltoluene, etc.
- Olefins For example, ethylene, butadiene, isoprene, isobutylene, etc.
- (Meth)acrylic acid esters having an alicyclic hydrocarbon group for example, cyclopentyl (meth)acrylate, cyclohexyl (meth)acrylate, isobornyl (meth)acrylate, dicyclopentanyl (meth)acrylate, adamantyl (meth)acrylate, etc. alicyclic hydrocarbon group-containing (meth)acrylate.
- (Meth)acrylic acid esters having an aromatic hydrocarbon group for example, aromatic hydrocarbon group-containing (meth)acrylates such as phenyl (meth)acrylate, phenoxyethyl (meth)acrylate, and benzyl (meth)acrylate.
- aromatic hydrocarbon group-containing (meth)acrylates such as phenyl (meth)acrylate, phenoxyethyl (meth)acrylate, and benzyl (meth)acrylate.
- heterocycle-containing (meth)acrylates such as tetrahydrofurfuryl (meth)acrylate, halogen atom-containing (meth)acrylates such as vinyl chloride and fluorine atom-containing (meth)acrylates, silicon atom-containing such as silicone (meth)acrylates (meth)acrylates, (meth)acrylic acid esters obtained from terpene compound derivative alcohols, and the like.
- the amount used is not particularly limited, but it is usually appropriate to use 0.01% by weight or more of the total monomer components.
- the amount of the copolymerizable monomer used may be 0.1% by weight or more, or 0.5% by weight or more of the total monomer components. From the viewpoint of facilitating the balance of adhesive properties, the amount of the copolymerizable monomer to be used is generally 50% by weight or less, preferably 40% by weight or less, of the total monomer components.
- the monomer component that constitutes the acrylic polymer may contain a nitrogen atom-containing monomer.
- a nitrogen atom-containing monomer is a monomer having a nitrogen atom-containing ring.
- the monomer having a nitrogen atom-containing ring those exemplified above can be used, and examples thereof include N-vinyl cyclic amides represented by the following general formula (1).
- R 1 is a divalent organic group, specifically -(CH 2 ) n -.
- n is an integer from 2 to 7 (preferably 2, 3 or 4).
- N-vinyl-2-pyrrolidone can be preferably employed.
- Another suitable example of a monomer having a nitrogen atom is (meth)acrylamide.
- the amount of the nitrogen atom-containing monomer is not particularly limited, and is, for example, 1% by weight or more, 3% by weight or more, 5% by weight or more, or 7% by weight or more of the total monomer components. can do.
- the amount of the monomer having a nitrogen atom used may be 10% by weight or more, 15% by weight or more, or 20% by weight or more of the total monomer components.
- the amount of the monomer having a nitrogen atom used is, for example, 40% by weight or less of the entire monomer component, and may be 35% by weight or less, 30% by weight or less, or 25% by weight or less. good too.
- the amount of the nitrogen atom-containing monomer used may be, for example, 20% by weight or less, or 15% by weight or less, of the total monomer components.
- the monomer component that constitutes the acrylic polymer may contain a hydroxyl group-containing monomer.
- a hydroxyl group-containing monomer By using a hydroxyl group-containing monomer, the degree of cohesion and cross-linking (for example, cross-linking with an isocyanate-based cross-linking agent) of the pressure-sensitive adhesive can be adjusted favorably.
- the amount used when using a hydroxyl group-containing monomer is not particularly limited, and may be, for example, 0.01% by weight or more, 0.1% by weight or more, or 0.5% by weight or more of the total monomer components. It may be 1% by weight or more, 5% by weight or more, or 10% by weight or more.
- the amount of the hydroxyl group-containing monomer used is, for example, 40% by weight or less of the total monomer components, and 30% by weight or less. may be 25% by weight or less, or 20% by weight or less.
- the amount of the hydroxyl group-containing monomer used may be, for example, 15% by weight or less, 10% by weight or less, or 5% by weight or less of the total monomer components.
- the monomer component of the acrylic polymer may or may not contain the alkoxyalkyl (meth)acrylates and alkoxypolyalkyleneglycol (meth)acrylates exemplified above. .
- the proportion of alkoxyalkyl (meth)acrylate in the monomer components of the acrylic polymer is less than 20% by weight, and the proportion of alkoxypolyalkyleneglycol (meth)acrylate is less than 20% by weight. is.
- the pressure-sensitive adhesive layer can be easily formed into a sheet without problems such as gelation.
- the solid content concentration of the monomer mixture can be maintained within a predetermined range to obtain a desired high molecular weight substance (for example, a weight average molecular weight (Mw) of more than 30 ⁇ 10 4 , typically Mw of 40 ⁇ 10 4 ). above) can be preferably polymerized.
- the proportion of alkoxyalkyl (meth)acrylate in the monomer component is preferably less than 10% by weight, more preferably less than 3% by weight, and even more preferably less than 1% by weight.
- the monomer component is Substantially free of alkoxyalkyl (meth)acrylate (content 0-0.3% by weight).
- the proportion of alkoxypolyalkylene glycol (meth)acrylate in the monomer component is preferably less than 10% by weight, more preferably less than 3% by weight, and even more preferably less than 1% by weight.
- the monomer component does not substantially contain alkoxypolyalkylene glycol (meth)acrylate (content 0 to 0.3% by weight).
- the total ratio of alkoxyalkyl (meth)acrylate and alkoxypolyalkyleneglycol (meth)acrylate is limited to less than 20% by weight from the viewpoint of suppressing gelation. .
- the total proportion of the alkoxyalkyl (meth)acrylate and alkoxypolyalkylene glycol (meth)acrylate is more preferably less than 10% by weight, still more preferably less than 3% by weight, and particularly preferably less than 1% by weight.
- the monomer component substantially does not contain alkoxyalkyl (meth)acrylates and alkoxypolyalkyleneglycol (meth)acrylates (content of 0 to 0.3% by weight).
- the monomer component of the acrylic polymer according to this aspect may or may not contain an alkoxy group-containing monomer at a rate of less than 20% by weight.
- the amount of the alkoxy group-containing monomer in the monomer component is preferably less than 10% by weight, more preferably less than 3% by weight, and still more preferably less than 1% by weight.
- the monomer component is an alkoxy group Substantially free of contained monomers (content of 0 to 0.3% by weight).
- the proportion of the carboxy group-containing monomer in the monomer component of the acrylic polymer may be, for example, 2% by weight or less, 1% by weight or less, or 0.5% by weight or less (e.g., 0.1% by weight or less). % by weight).
- Carboxy group-containing monomers may not be substantially used as the monomer component of the acrylic polymer.
- substantially no carboxy group-containing monomer is used means that no carboxy group-containing monomer is used at least intentionally.
- An acrylic polymer having such a composition tends to have high water resistance and reliability, and can have metal corrosion prevention properties for adherends containing metal.
- the monomer component of the acrylic polymer has a limited proportion of hydrophilic monomers.
- the "hydrophilic monomer” in the present specification includes a carboxy group-containing monomer, an acid anhydride group-containing monomer, a hydroxyl group-containing monomer, a monomer having a nitrogen atom (typically, an amide group-containing monomer such as (meth)acrylamide).
- monomers, nitrogen atom-containing ring-containing monomers such as N-vinyl-2-pyrrolidone
- alkoxy group-containing monomers typically alkoxyalkyl (meth)acrylates and alkoxypolyalkyleneglycol (meth)acrylates
- the proportion of the hydrophilic monomer in the monomer components of the acrylic polymer is preferably 32% by weight or less, and may be, for example, 30% by weight or less, or may be 28% by weight or less.
- the proportion of the hydrophilic monomer in the monomer component of the acrylic polymer may be 1% by weight or more, 10% by weight or more, or 20% by weight or more. may be
- the monomer component that constitutes the acrylic polymer may contain an alicyclic hydrocarbon group-containing (meth)acrylate.
- alicyclic hydrocarbon group-containing (meth)acrylate those exemplified above can be used, and for example, cyclohexyl acrylate and isobornyl acrylate can be preferably employed.
- the amount used when using an alicyclic hydrocarbon group-containing (meth)acrylate is not particularly limited, and can be, for example, 1% by weight or more, 3% by weight or more, or 5% by weight or more of the total monomer components.
- the amount of the alicyclic hydrocarbon group-containing (meth)acrylate used may be 10% by weight or more, or may be 15% by weight or more of the total monomer components.
- the upper limit of the amount of the alicyclic hydrocarbon group-containing (meth)acrylate used is suitably about 40% by weight or less, and may be, for example, 30% by weight or less, or 25% by weight or less (e.g., 15% by weight). % or less, or even 10% by weight or less).
- the composition of the monomer components constituting the acrylic polymer can be set so that the glass transition temperature Tg obtained from the Fox formula based on the composition of the monomer components is -75°C or higher and 10°C or lower.
- the Tg is suitably 0° C. or less, preferably ⁇ 10° C. or less, or ⁇ 20° C. or less or ⁇ 30° C. from the viewpoint of cohesiveness, impact resistance, or the like. It may be below.
- the above Tg may be, for example, -60°C or higher, -50°C or higher, -45°C or higher, or -40°C or higher.
- Tg is the glass transition temperature of the copolymer (unit: K)
- Wi is the weight fraction of the monomer i in the copolymer (copolymerization ratio based on weight)
- Tgi is the content of the monomer i. It represents the glass transition temperature (unit: K) of a homopolymer.
- the glass transition temperature of the homopolymer used to calculate the Tg the value described in the publicly known document shall be used.
- the monomers listed below the following values are used as the glass transition temperatures of the homopolymers of the monomers.
- a reaction vessel equipped with a thermometer, a stirrer, a nitrogen inlet tube and a reflux condenser. It is put in and stirred for 1 hour while nitrogen gas is circulated. After oxygen is removed from the polymerization system in this manner, the temperature is raised to 63° C. and the reaction is allowed to proceed for 10 hours.
- This test sample is punched out into a disk shape with a diameter of 7.9 mm, sandwiched between parallel plates, and subjected to shear strain at a frequency of 1 Hz using a viscoelasticity tester (ARES, manufactured by Rheometrics Co., Ltd.) while applying a temperature range of -70 to 150 ° C. , the viscoelasticity is measured in shear mode at a heating rate of 5° C./min, and the peak top temperature of tan ⁇ is defined as the Tg of the homopolymer.
- ARES viscoelasticity tester
- the acrylic polymer according to this aspect is not particularly limited, it preferably has an SP value of 23.0 (MJ/m 3 ) 1/2 or less.
- the above SP value is more preferably 21.0 (MJ/m 3 ) 1/2 or less (for example, 20.0 (MJ/m 3 ) 1/2 or less).
- the lower limit of the SP value is not particularly limited. Yes, preferably 18.0 (MJ/m 3 ) 1/2 or more.
- An acrylic polymer having the above SP value can be obtained by appropriately determining the monomer composition based on the common technical knowledge of those skilled in the art.
- the above pressure-sensitive adhesive composition contains the monomer component having the composition as described above in the form of a polymer, an unpolymer (that is, a form in which the polymerizable functional group is unreacted), or a mixture thereof.
- the pressure-sensitive adhesive composition includes a water-dispersed pressure-sensitive adhesive composition in which the pressure-sensitive adhesive (adhesive component) is dispersed in water, a solvent-based pressure-sensitive adhesive composition in which the pressure-sensitive adhesive is contained in an organic solvent, and a An active energy ray-curable adhesive composition prepared to form an adhesive by curing with an active energy ray, a hot-melt adhesive that is coated in a heat-melted state and forms an adhesive when cooled to around room temperature It can be in various forms such as compositions.
- the pressure-sensitive adhesive composition according to a preferred embodiment is a solvent-based pressure-sensitive adhesive composition.
- thermal polymerization initiator or radical photopolymerization initiator may be used depending on the polymerization method, polymerization mode, and the like.
- Such polymerization initiators can be used singly or in combination of two or more.
- thermal polymerization initiator is not particularly limited, for example, an azo polymerization initiator, a peroxide initiator, a redox initiator obtained by combining a peroxide and a reducing agent, and a substituted ethane initiator. etc. can be used.
- 2,2′-azobisisobutyronitrile AIBN
- 2,2′-azobis(2-methylpropionamidine) disulfate 2,2′-azobis(2-amidinopropane ) dihydrochloride
- 2,2′-azobis[2-(5-methyl-2-imidazolin-2-yl)propane]dihydrochloride 2,2′-azobis(N,N′-dimethyleneisobutyramidine)
- 2 2′-azobis[N-(2-carboxyethyl)-2-methylpropionamidine]hydrate
- azo initiators such as hydrate
- persulfates such as potassium persulfate and ammonium persulfate
- benzoyl peroxide t-butyl Peroxide-based initiators such as hydroperoxides, hydrogen peroxide; substituted ethane-based initiators such as phenyl-substituted ethane; e.g.
- Redox initiators such as; Thermal polymerization can be preferably carried out at a temperature of, for example, about 20 to 100°C (typically 40 to 80°C).
- the photoradical polymerization initiator is not particularly limited, but examples include 1-[4-(2-hydroxyethoxy)-phenyl]-2-hydroxy-2-methyl-1-propan-1-one, 1-hydroxy-cyclohexyl-phenyl-ketone, benzophenone, 2,2-dimethoxy-1,2-diphenylethan-1-one, 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide, 2,4,6-trimethyl Benzoyl-phenylethoxy-phosphine oxide, 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)-butanone-1,2-hydroxy-2-methyl-1-phenyl-propan-1-one, 2 -methyl-1-(4-methylthiophenyl)-2-morpholinopropan-1-one, benzoin methyl ether, benzoin ethyl ether, benzoin isobutyl ether, benzoin isopropyl ether, bis(2,4,6-
- the amount of such a thermal polymerization initiator or radical photopolymerization initiator to be used is not particularly limited and can be a normal amount to be used according to the polymerization method, polymerization mode, and the like.
- about 0.001 to 5 parts by weight (typically about 0.01 to 2 parts by weight, for example about 0.01 to 1 part by weight) of a polymerization initiator is used with respect to 100 parts by weight of the monomer to be polymerized. be able to.
- chain transfer agents which can also be understood as molecular weight modifiers or polymerization degree modifiers
- chain transfer agents which can also be understood as molecular weight modifiers or polymerization degree modifiers
- Mercaptans such as n-dodecylmercaptan, t-dodecylmercaptan, thioglycolic acid and ⁇ -thioglycerol can be used as chain transfer agents.
- non-sulfur chain transfer agent a chain transfer agent that does not contain sulfur atoms
- non-sulfur chain transfer agent include anilines such as N,N-dimethylaniline and N,N-diethylaniline; terpenoids such as ⁇ -pinene and terpinolene; ⁇ -methylstyrene and ⁇ -methylstyrene dimer.
- styrenes such as dibenzylideneacetone, cinnamyl alcohol, compounds having a benzylidenyl group such as cinnamylaldehyde; hydroquinones such as hydroquinone and naphthohydroquinone; quinones such as benzoquinone and naphthoquinone; 2,3-dimethyl-2-butene , olefins such as 1,5-cyclooctadiene; alcohols such as phenol, benzyl alcohol and allyl alcohol; benzyl hydrogens such as diphenylbenzene and triphenylbenzene;
- the chain transfer agent can be used singly or in combination of two or more.
- the amount used can be, for example, about 0.01 to 1 part by mass with respect to 100 parts by mass of the monomer component.
- the technology according to this aspect can also be preferably practiced in an aspect that does not use a chain transfer agent.
- the molecular weight of the acrylic polymer obtained by appropriately adopting the various polymerization methods described above is not particularly limited, and can be set within an appropriate range according to the required performance.
- the weight-average molecular weight (Mw) of the acrylic polymer is usually about 10 ⁇ 10 4 or more (for example, 20 ⁇ 10 4 or more), and from the viewpoint of balancing cohesive strength and adhesive strength in a well-balanced manner, more than 30 ⁇ 10 4 It is appropriate to
- the acrylic polymer according to one aspect is preferably 40 ⁇ 10 4 or more (typically about 50 ⁇ 10 4 or more, for example about 55 ⁇ 10 4 or more) from the viewpoint of obtaining good adhesion reliability even in a high-temperature environment. ).
- gelation can be suppressed by designing the monomer composition, so that a high molecular weight substance within the above range can be obtained with good productivity by setting an appropriate solid content concentration.
- the upper limit of Mw of the acrylic polymer can usually be approximately 500 ⁇ 10 4 or less (for example, approximately 150 ⁇ 10 4 or less).
- the above Mw may be approximately 75 ⁇ 10 4 or less.
- Mw refers to a value converted to standard polystyrene obtained by gel permeation chromatography (GPC).
- GPC gel permeation chromatography
- model name "HLC-8320GPC” column: TSKgelGMH-H(S), manufactured by Tosoh Corporation
- the above Mw can be the Mw of the acrylic polymer in either the pressure-sensitive adhesive composition or the pressure-sensitive adhesive layer.
- the adhesive composition according to some embodiments may be an active energy ray-curable adhesive composition.
- active energy rays here include light such as ultraviolet rays, visible rays, and infrared rays, and radiation such as ⁇ rays, ⁇ rays, ⁇ rays, electron beams, neutron rays, and X rays.
- Energy rays having energy capable of causing chemical reactions such as reactions, cross-linking reactions, decomposition of initiators, etc. can be mentioned.
- a suitable example of an active energy ray-curable adhesive composition is a photocurable adhesive composition.
- a photocurable pressure-sensitive adhesive composition has the advantage that even a thick pressure-sensitive adhesive layer can be easily formed. Among them, an ultraviolet curable pressure-sensitive adhesive composition is preferred.
- the photocurable pressure-sensitive adhesive composition contains at least part of the monomer components of the composition (may be part of the types of monomers or part of the amount). It is contained in the form of a polymer.
- the polymerization method for forming the polymer is not particularly limited, and conventionally known various polymerization methods can be appropriately employed.
- thermal polymerization such as solution polymerization, emulsion polymerization, bulk polymerization (typically performed in the presence of a thermal polymerization initiator); photopolymerization performed by irradiating light such as ultraviolet rays (typically, conducted in the presence of a photoradical polymerization initiator); radiation polymerization conducted by irradiating radiation such as ⁇ -rays and ⁇ -rays; Among them, photopolymerization is preferred.
- a photocurable pressure-sensitive adhesive composition contains a partially polymerized monomer component.
- a partial polymer is typically a mixture of a polymer derived from the monomer component and an unreacted monomer, and preferably presents a syrup (viscous liquid).
- the partial polymer having such properties is sometimes referred to as "monomer syrup” or simply “syrup”.
- the polymerization method for partially polymerizing the monomer components is not particularly limited, and various polymerization methods as described above can be appropriately selected and used.
- a photopolymerization method can be preferably employed from the viewpoint of efficiency and convenience. According to photopolymerization, the polymerization conversion rate of the monomer component (monomer conversion) can be easily controlled by the polymerization conditions such as the irradiation amount of light (light amount).
- the polymerization conversion rate of the monomer mixture in the partially polymerized product is not particularly limited.
- the polymerization conversion rate can be, for example, about 70% by weight or less, preferably about 60% by weight or less.
- the polymerization conversion rate is usually about 50% by weight or less, and about 40% by weight or less (for example, about 35% by weight). % by weight or less) is preferred.
- the lower limit of the polymerization conversion rate is not particularly limited, it is typically about 1% by weight or more, and usually about 5% by weight or more is suitable.
- a pressure-sensitive adhesive composition containing a partially polymerized product of a monomer component can be obtained, for example, by partially polymerizing a monomer mixture containing all of the monomer components used in the preparation of the pressure-sensitive adhesive composition by an appropriate polymerization method (e.g., photopolymerization method).
- an appropriate polymerization method e.g., photopolymerization method
- the pressure-sensitive adhesive composition containing a partial polymer of monomer components is a partial polymer or a complete polymer of a monomer mixture containing a part of the monomer components used in the preparation of the pressure-sensitive adhesive composition, and the remaining monomers. It may be a mixture with a component or a partial polymer thereof.
- the term "completely polymerized product" means that the polymerization conversion rate is over 95% by weight.
- the pressure-sensitive adhesive composition of one embodiment of the present invention contains a material discolored by water or steam (hereinafter also referred to as a water-discolored material).
- a water-discolored material a material discolored by water or steam
- the type of water-discoloring material is not limited as long as it discolors with water or steam.
- color means that the color is changed by water or steam, and the color disappears by water or steam, the color appears by water or steam, and the original color is restored by water or steam.
- a concept that involves changing to a different color is a concept that involves changing to a different color.
- the water-discoloring material according to this aspect preferably contains a transition metal compound capable of coordinating water molecules.
- the transition metal compound undergoes a color change when water is coordinated (hydration reaction) to change the energy of the d-orbital of the metal, thereby changing the absorption spectrum of visible light. Since such a hydration reaction is a reversible reaction, it can be reused by drying after the hydration reaction.
- transition metal compounds that can coordinate water molecules include cobalt chloride, copper sulfate, and copper chloride.
- Cobalt chloride changes from blue to reddish pink by coordinating water molecules
- copper sulfate changes from white to blue by coordinating water molecules
- copper chloride changes from yellow to coordinating water molecules. turns blue-green.
- cobalt chloride is preferable because it has high compatibility with the base polymer, especially the acrylic polymer, and it can be easily distinguished by visual observation because of the remarkable change in the color spectrum.
- the water-discoloring material according to this aspect may be used singly or in combination of two or more.
- the water discoloration material according to this aspect is preferably 0.5 to 100 parts by mass, more preferably 1 to 80 parts by mass, and 3 to 70 parts by mass per 100 parts by mass of the base polymer. is more preferable, and 10 to 50 parts by mass is more preferable. Within the above range, discoloration due to the water-discoloring material can be conspicuously observed.
- the water-discoloring material in order to uniformly mix the water-discoloring material in the composition, the water-discoloring material is dissolved in a polar solvent and mixed with the base polymer described above. is preferred. That is, the pressure-sensitive adhesive composition of one embodiment of the present invention preferably contains a polar solvent.
- the polar solvent preferably contains at least one of alcohols, ketones, and aromatic compounds containing a nitrogen atom in the molecule.
- alcohol examples include ethanol and methanol.
- ketones examples include acetone and the like.
- Aromatic compounds containing a nitrogen atom in the molecule include, for example, quinoline and benzonitrile.
- the polar solvent is preferably alcohol.
- the pressure-sensitive adhesive composition of one embodiment of the present invention contains a polar solvent, it preferably contains 1 mass ppm or more of the polar solvent relative to the pressure-sensitive adhesive composition, more preferably 3 mass ppm or more, It is more preferable to contain 5 mass ppm or more, and it is particularly preferable to contain 10 mass ppm or more.
- the pressure-sensitive adhesive composition of one embodiment of the present invention may contain a peel strength increasing agent.
- the release force increasing agent has a function of increasing the release force of the adhesive sheet from the adherend after the surface (adhesive surface) of the adhesive layer formed from the adhesive composition is attached to the adherend. can be appropriately selected and used.
- a known silane coupling agent can be used as the peel strength increasing agent.
- the release strength increasing agent is preferably contained in the adhesive composition (and thus the adhesive layer) in free form. Typically, it is preferred that the peel strength increasing agent does not chemically bond with other constituents that may be contained in the pressure-sensitive adhesive composition (and thus the pressure-sensitive adhesive layer).
- the release force increasing agent contained in the pressure-sensitive adhesive composition in such a form can effectively contribute to the improvement of the release force.
- a silane coupling agent is typically a compound containing a functional group X and a functional group Y in one molecule, wherein the functional group X is an alkoxysilyl group.
- the alkoxysilyl group is a functional group having at least one alkoxy group on the silicon atom.
- the silanol groups generated by hydrolysis of the alkoxy groups react with the hydroxyl groups on the adherend surface, thereby It is possible to increase the peel strength of the pressure-sensitive adhesive sheet from the adherend.
- the alkoxysilyl group is hydrolyzed to generate a silanol group that reacts with the hydroxyl group on the surface of the adherend. Therefore, the alkoxysilyl group is a precursor of the group that reacts with the hydroxyl group.
- the alkoxy group that constitutes the alkoxysilyl group is typically a methoxy group or an ethoxy group. Methoxy groups, which are more hydrolyzable, are usually preferred.
- the alkoxysilyl group may be a trialkoxysilyl group or a dialkoxysilyl group.
- a silane coupling agent having a trialkoxysilyl group can be preferably employed in some embodiments from the viewpoint of increasing the peel strength increasing effect.
- Functional group Y is, for example, an epoxy group, an amino group, an isocyanate group (which may constitute an isocyanurate), an acetoacetyl group, a (meth)acryloyl group, a mercapto group, a vinyl group, a halogenated alkyl group, or the like.
- silane coupling agents having such a functional group Y include, for example, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 2-( Epoxy group-containing silane coupling agents such as 3,4-epoxycyclohexyl)ethyltrimethoxysilane; -aminoethyl) 3-aminopropylmethyldimethoxysilane and other amino group-containing silane coupling agents; for example, 3-isocyanatopropyltriethoxysilane, tris(trimethoxysilylpropyl)isocyanurate and other isocyanate group-containing silane coupling agents; acetoacetyl group-containing silane coupling agents such as acetoacetyl group-containing trimethoxysilane; acryloyl group-containing silane coupling agents; vinyl group-containing silane coupling
- silane coupling agent one having a functional group Y that reacts with the functional group y contained in the adhesive layer can be used.
- a combination of a carboxyl group as the functional group y and a silane coupling agent having an epoxy group as the functional group Y can be mentioned.
- other combinations include a combination of an amino group and an epoxy group, a combination of a hydroxyl group and an epoxy group, a combination of a carboxy group and an amino group, a combination of an isocyanate group and an amino group, and a combination of a sulfo group and an amino group.
- a combination etc. are mentioned.
- the pressure-sensitive adhesive composition contains a silane from the viewpoint of maintaining the release force increasing agent in a free state in the pressure-sensitive adhesive composition, thereby facilitating migration of the release force increasing agent to the surface. It may not have a functional group y (eg, carboxyl group) that reacts with the functional group Y (eg, epoxy group) of the coupling agent.
- a functional group y eg, carboxyl group
- Y eg, epoxy group
- the molecular weight (chemical formula weight) of the silane coupling agent is not particularly limited, and can be about 120-1000, for example. Generally, a silane coupling agent having a molecular weight of 180 or more, 200 or more, or 220 or more is preferable from the viewpoint of ease of adjustment of the reworkable period and mobility to the adhesive surface.
- a silane coupling agent having a molecular weight of 800 or less, 600 or less, 400 or less, or 300 or less is preferred.
- a silane coupling agent having a molecular weight of 200 or more and 300 or less can be preferably used.
- the value of the molecular weight of the silane coupling agent a value calculated based on the structural formula of the silane coupling agent is used. Alternatively, the manufacturer's nominal value may be used.
- the amount of the peel strength increasing agent (for example, silane coupling agent) contained in the pressure-sensitive adhesive composition of one embodiment of the present invention can be set so as to obtain the desired effect, and is not particularly limited.
- the amount of the release force increasing agent can be, for example, 0.005 parts by mass or more per 100 parts by mass of the base polymer contained in the adhesive composition.
- the content of the release force increasing agent per 100 parts by mass of the base polymer is usually suitably 0.05 parts by mass or more, 0.10 parts by mass or more, 0.20 parts by mass or more, or 0.30 parts by mass. It can be more than part.
- the content of the release force increasing agent per 100 parts by mass of the base polymer in the pressure-sensitive adhesive composition may be, for example, 5 parts by mass or less, 3 parts by mass or less, or 1 part by mass. parts or less, or 0.7 parts by mass or less (for example, 0.5 parts by mass or less).
- the pressure-sensitive adhesive composition of one embodiment of the present invention may optionally contain a cross-linking agent mainly for the purpose of cross-linking within the pressure-sensitive adhesive layer or cross-linking between the pressure-sensitive adhesive layer and its adjacent surface.
- the type of the cross-linking agent is not particularly limited, and is selected from conventionally known cross-linking agents so that the cross-linking agent exhibits an appropriate cross-linking function in the pressure-sensitive adhesive layer according to, for example, the composition of the pressure-sensitive adhesive composition. be able to.
- Cross-linking agents that can be used include isocyanate cross-linking agents, epoxy cross-linking agents, oxazoline cross-linking agents, aziridine cross-linking agents, carbodiimide cross-linking agents, melamine cross-linking agents, urea cross-linking agents, metal alkoxide cross-linking agents, metal Examples include chelate-based cross-linking agents, metal salt-based cross-linking agents, hydrazine-based cross-linking agents, amine-based cross-linking agents, and the like. These can be used individually by 1 type or in combination of 2 or more types.
- a bifunctional or higher polyfunctional isocyanate compound can be used.
- aromatic isocyanates such as tolylene diisocyanate, xylylene diisocyanate, polymethylene polyphenyl diisocyanate, tris(p-isocyanatophenyl)thiophosphate, diphenylmethane diisocyanate; alicyclic isocyanates such as isophorone diisocyanate; aliphatic isocyanates such as hexamethylene diisocyanate group isocyanate; and the like.
- epoxy-based cross-linking agent those having two or more epoxy groups in one molecule can be used without particular limitation.
- An epoxy-based cross-linking agent having 3 to 5 epoxy groups in one molecule is preferred.
- epoxy-based cross-linking agents include N,N,N',N'-tetraglycidyl-m-xylenediamine, 1,3-bis(N,N-diglycidylaminomethyl)cyclohexane, and 1,6-hexane.
- epoxy-based cross-linking agents include products manufactured by Mitsubishi Gas Chemical Co., Ltd. under the trade names of "TETRAD-X” and “TETRAD-C”, DIC under the trade name of "Epiclon CR-5L”, and products manufactured by Nagase ChemteX Corporation. name “Denacol EX-512", product name “TEPIC-G” manufactured by Nissan Chemical Industries, Ltd., and the like.
- oxazoline-based cross-linking agent one having one or more oxazoline groups in one molecule can be used without particular limitation.
- aziridine-based cross-linking agents examples include trimethylolpropane tris [3-(1-aziridinyl) propionate], trimethylol propane tris [3-(1-(2-methyl) aziridinyl propionate)], and the like. be done.
- carbodiimide-based cross-linking agent a low-molecular-weight compound or a high-molecular-weight compound having two or more carbodiimide groups can be used.
- peroxides may be used as cross-linking agents.
- Peroxides include di(2-ethylhexyl)peroxydicarbonate, di(4-t-butylcyclohexyl)peroxydicarbonate, di-sec-butylperoxydicarbonate, t-butyl peroxyneodecanoate. , t-hexyl peroxypivalate, t-butyl peroxypivalate, dilauroyl peroxide, di-n-octanoyl peroxide, 1,1,3,3-tetramethylbutyl peroxyisobutyrate, di benzoyl peroxide and the like.
- di(4-t-butylcyclohexyl)peroxydicarbonate di(4-t-butylcyclohexyl)peroxydicarbonate, dilauroyl peroxide, dibenzoyl peroxide and the like are mentioned as peroxides that are particularly excellent in cross-linking reaction efficiency.
- a peroxide when used as the polymerization initiator, it is also possible to use the remaining peroxide that has not been used in the polymerization reaction for the cross-linking reaction. In that case, the residual amount of the peroxide is quantified, and if the ratio of the peroxide is less than the predetermined amount, the peroxide may be added as necessary so as to obtain the predetermined amount.
- Peroxide can be quantified by the method described in Japanese Patent No. 4971517.
- the content of the cross-linking agent (the total amount when two or more cross-linking agents are included) is not particularly limited. From the viewpoint of realizing a pressure-sensitive adhesive that exerts adhesive properties such as adhesive strength and cohesive strength in a well-balanced manner, the content of the cross-linking agent is usually about 5 parts by mass with respect to 100 parts by mass of the base polymer contained in the pressure-sensitive adhesive composition. parts or less, preferably about 0.001 to 5 parts by mass, more preferably about 0.001 to 4 parts by mass, and about 0.001 to 3 parts by mass. is more preferred. Alternatively, it may be a pressure-sensitive adhesive composition that does not contain a cross-linking agent as described above.
- the pressure-sensitive adhesive composition may be substantially free of cross-linking agents such as isocyanate-based cross-linking agents.
- the pressure-sensitive adhesive composition substantially does not contain a cross-linking agent (typically an isocyanate-based cross-linking agent) means that the amount of the cross-linking agent is less than 0.05 parts by mass (for example, 0.05 part by mass) relative to 100 parts by mass of the base polymer. 01 parts by mass).
- a cross-linking catalyst may be used to promote the cross-linking reaction more effectively.
- cross-linking catalysts include metallic cross-linking catalysts such as tetra-n-butyl titanate, tetraisopropyl titanate, Nasem ferric iron, butyltin oxide, and dioctyltin dilaurate (dioctyltin dilaurate).
- metallic cross-linking catalysts such as tetra-n-butyl titanate, tetraisopropyl titanate, Nasem ferric iron, butyltin oxide, and dioctyltin dilaurate (dioctyltin dilaurate).
- tin-based cross-linking catalysts such as dioctyltin dilaurate (dioctyltin dilaurate) are preferred.
- the amount of cross-linking catalyst used is not particularly limited.
- the amount of the crosslinking catalyst used relative to 100 parts by mass of the base polymer in the pressure-sensitive adhesive composition may be, for example, about 0.0001 part by mass or more and 1 part by mass or less, or may be 0.001 part by mass or more and 0.1 part by mass or less. , 0.005 parts by mass or more and 0.5 parts by mass or less.
- a multifunctional monomer may be used in the adhesive composition (and thus the adhesive layer) as necessary.
- a polyfunctional monomer can be useful for purposes such as adjusting cohesive strength when used in place of the above-described cross-linking agent or in combination with the cross-linking agent.
- a polyfunctional monomer can be preferably used in a pressure-sensitive adhesive layer formed from a photocurable pressure-sensitive adhesive composition.
- polyfunctional 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, ethylene glycol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, 1,12-dodecane Diol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, tetramethylolmethane tri(meth)acrylate, allyl (meth)acrylate, vinyl (meth)acrylate, divinylbenzene, epoxy acrylate, polyester acrylate, urethane acrylate,
- trimethylolpropane tri(meth)acrylate, 1,6-hexanediol di(meth)acrylate, and dipentaerythritol hexa(meth)acrylate can be preferably used.
- a polyfunctional monomer can be used individually by 1 type or in combination of 2 or more types.
- the amount of the polyfunctional monomer used varies depending on its molecular weight, the number of functional groups, etc., but it is usually appropriate to use it in the range of about 0.01 to 3.0 parts by mass with respect to 100 parts by mass of the base polymer. be.
- the amount of the polyfunctional monomer used relative to 100 parts by mass of the base polymer may be, for example, 0.02 parts by mass or more, may be 0.1 parts by mass or more, or may be 0.5 parts by mass. parts or more, 1.0 parts by mass or more, or 2.0 parts by mass or more.
- the amount of the polyfunctional monomer used relative to 100 parts by weight of the base polymer is, for example, 10 parts by weight or less. 5.0 parts by mass or less, or 3.0 parts by mass or less.
- the pressure-sensitive adhesive composition (and thus the pressure-sensitive adhesive layer) of one embodiment of the present invention has improved cohesive strength and adhesion to a surface adjacent to the pressure-sensitive adhesive layer (for example, it may be the surface of a substrate). From the viewpoint of improvement, etc., an acrylic oligomer can be contained.
- the acrylic oligomer it is preferable to use a polymer whose Tg is higher than that of the acrylic polymer.
- the Tg of the acrylic oligomer is not particularly limited, and may be, for example, about 20°C or higher and 300°C or lower.
- the Tg may be, for example, about 30° C. or higher, about 40° C. or higher, about 60° C. or higher, about 80° C. or higher, or about 100° C. or higher.
- the Tg of the acrylic oligomer increases, the effect of improving the cohesion tends to increase.
- the Tg of the acrylic oligomer may be, for example, about 250° C. or less, even about 200° C. or less, about 180° C. or less, or about 150° C. or less. good.
- the Tg of the acrylic oligomer is a value calculated based on the Fox formula, like the Tg of the acrylic polymer corresponding to the composition of the monomer component.
- the Mw of the acrylic oligomer can typically be about 1000 or more and less than about 30000, preferably about 1500 or more and about 10000 or less, more preferably about 2000 or more and about 5000 or less. When Mw is within the above range, the effect of improving cohesiveness and adhesiveness with adjacent surfaces tends to be favorably exhibited.
- the Mw of the acrylic oligomer can be measured by gel permeation chromatography (GPC) and calculated as a value converted to standard polystyrene. Specifically, measurement is performed using HPLC8020 manufactured by Tosoh Corporation, using TSKgelGMH-H(20) ⁇ 2 columns, and using tetrahydrofuran as a solvent at a flow rate of about 0.5 mL/min.
- GPC gel permeation chromatography
- the monomer component constituting the acrylic oligomer various (meth)acrylic acid C 1-20 alkyl esters described above; various alicyclic hydrocarbon group-containing (meth)acrylates described above; Hydrogen group-containing (meth)acrylates; (meth)acrylates obtained from terpene compound derivative alcohols; and other (meth)acrylate monomers can be mentioned. These can be used individually by 1 type or in combination of 2 or more types.
- Acrylic oligomers include alkyl (meth)acrylates having branched alkyl groups such as isobutyl (meth)acrylate and t-butyl (meth)acrylate; alicyclic hydrocarbon group-containing (meth)acrylates and aromatic hydrocarbons From the viewpoint of improving adhesiveness, it is preferable to contain an acrylic monomer having a relatively bulky structure, such as a group-containing (meth)acrylate, as a monomer unit.
- a monomer having a saturated hydrocarbon group at the ester end is preferable because it is less likely to cause polymerization inhibition.
- Alkyl (meth)acrylates and saturated alicyclic hydrocarbon group-containing (meth)acrylates in which the group has a branched structure can be preferably used.
- the ratio of the (meth)acrylate monomer to the total monomer components constituting the acrylic oligomer is typically more than 50% by weight, preferably 60% by weight or more, more preferably 70% by weight or more (e.g., 80% by weight). or more, and further 90% by weight or more).
- the acrylic oligomer has a monomer composition consisting essentially of one or more (meth)acrylate monomers.
- the monomer component contains an alicyclic hydrocarbon group-containing (meth)acrylate and a (meth)acrylic acid C 1-20 alkyl ester
- the weight ratio thereof is not particularly limited, for example 10/90 to 90/10. range, 20/80 to 80/20 range, 70/30 to 30/70 range, and the like.
- Examples of functional group-containing monomers include monomers having a nitrogen atom-containing heterocyclic ring such as N-vinyl-2-pyrrolidone and N-acryloylmorpholine; amino group-containing monomers such as N,N-dimethylaminoethyl (meth)acrylate; amide group-containing monomers such as N-diethyl(meth)acrylamide; carboxy group-containing monomers such as AA and MAA; hydroxyl group-containing monomers such as 2-hydroxyethyl(meth)acrylate;
- the ratio of the functional group-containing monomer to all monomer components constituting the acrylic oligomer can be, for example, 1% by weight or more, 2% by weight or more, or 3% by weight or more, and For example, it can be 15% by weight or less, 10% by weight or less, or 7% by weight or less.
- Suitable acrylic oligomers include, for example, dicyclopentanyl methacrylate (DCPMA), cyclohexyl methacrylate (CHMA), isobornyl methacrylate (IBXMA), isobornyl acrylate (IBXA), dicyclopentanyl acrylate (DCPA),
- DCPMA dicyclopentanyl methacrylate
- CHMA cyclohexyl methacrylate
- IBXMA isobornyl methacrylate
- IBXA dicyclopentanyl acrylate
- DCPA dicyclopentanyl acrylate
- ADMA 1-adamantyl methacrylate
- ADA 1-adamantyl acrylate
- copolymers of DCPMA and MMA copolymers of DCPMA and IBXMA, copolymers of ADA and methyl methacrylate (MMA) copolymers of CHMA and isobutyl methacrylate (IBMA); copolymers
- An acrylic oligomer can be formed by polymerizing its constituent monomer components.
- the polymerization method and polymerization mode are not particularly limited, and conventionally known various polymerization methods (eg, solution polymerization, emulsion polymerization, bulk polymerization, photopolymerization, radiation polymerization, etc.) can be employed in an appropriate mode.
- the types of polymerization initiators e.g., azo polymerization initiators
- the amount of polymerization initiator and optionally used chain transfer agent For example, the amount of mercaptans) is appropriately set based on common technical knowledge so as to achieve a desired molecular weight, so detailed description is omitted.
- the content thereof can be, for example, 0.01 parts by mass or more with respect to 100 parts by mass of the base polymer. 05 parts by mass or more, 0.1 parts by mass or more, or 0.2 parts by mass or more.
- the content of the acrylic oligomer is usually less than 50 parts by mass, preferably less than 30 parts by mass, and more preferably 25 parts by mass or less. and may be 10 parts by mass or less, 5 parts by mass or less, or 1 part by mass or less.
- the pressure-sensitive adhesive composition of one embodiment of the present invention may optionally include a tackifying resin (e.g., rosin-based, petroleum-based, terpene-based, phenol-based, ketone-based, etc.) adhesives as long as the effects of the present invention are not impaired. imparting resin), viscosity modifiers (e.g. thickeners), leveling agents, plasticizers, fillers, colorants such as pigments and dyes, stabilizers, preservatives, antioxidants, etc.
- Various other additives may be included as other optional ingredients. As for such various additives, conventionally known ones can be used in a conventional manner, and since they do not particularly characterize the present invention, detailed description thereof will be omitted.
- the content of the above-mentioned tackifying resin in the pressure-sensitive adhesive composition is 100 parts by mass of the base polymer.
- it can be less than 10 parts by mass, or even less than 5 parts by mass.
- the content of the tackifying resin may be less than 1 part by mass (for example, less than 0.5 parts by mass) or less than 0.1 parts by mass (0 parts by mass or more and less than 0.1 parts by mass).
- the pressure-sensitive adhesive composition may be free of tackifying resins.
- the pressure-sensitive adhesive composition of one embodiment of the present invention preferably has a limited amount of components other than the base polymer in the pressure-sensitive adhesive composition.
- the amount of components other than the base polymer in the pressure-sensitive adhesive composition is usually about 30% by weight or less, suitably about 15% by weight or less, preferably about 12% by weight. or less (for example, approximately 10% by weight or less).
- the amount of components other than the base polymer in the pressure-sensitive adhesive composition according to one aspect may be approximately 5% by weight or less, may be approximately 3% by weight or less, or may be approximately 1.5% by weight or less (for example, approximately 1% by weight or less).
- a composition in which the amounts of components other than the base polymer are thus limited can be preferably employed for the pressure-sensitive adhesive composition according to this aspect.
- a method for producing a pressure-sensitive adhesive composition according to one embodiment of the present invention includes the steps of dissolving a material discolored by water or steam in a polar solvent; adding to the base polymer solution.
- Polar solvents include those mentioned above.
- a water discoloring material dissolved in a polar solvent is added to the base polymer solution, and the two are mixed.
- a base polymer solution for example, a base polymer solution prepared by solution polymerization can be used.
- the base polymer solution preferably contains a polar solvent as a polymerization solvent, and more preferably contains a non-hydrocarbon organic solvent such as ethyl acetate.
- the non-hydrocarbon organic solvent means an organic solvent that is not a hydrocarbon organic solvent.
- a polar solvent, particularly a non-hydrocarbon organic solvent has high compatibility with the polar solvent in which the water-discoloring material is dissolved, so that the water-discoloring material can be uniformly mixed in the resulting pressure-sensitive adhesive composition.
- alcohols, ketones, or aromatic compounds containing a nitrogen atom in the molecule are compatible with polar solvents, especially non-hydrocarbon organic solvents such as ethyl acetate, as polar solvents that dissolve water discoloration materials. high. Therefore, it is more preferable to use an alcohol, a ketone, or an aromatic compound containing a nitrogen atom in the molecule as the polar solvent for dissolving the water discoloring material, and it is even more preferable to use an alcohol.
- the pressure-sensitive adhesive layer of one embodiment of the present invention is formed from the pressure-sensitive adhesive composition.
- FIG. 1 shows a schematic cross-sectional view of one structural example of the pressure-sensitive adhesive layer of one embodiment of the present invention.
- the adhesive layer may be a cured layer of an adhesive composition. That is, the pressure-sensitive adhesive layer can be formed by applying (for example, applying) the pressure-sensitive adhesive composition to a suitable surface and then appropriately performing a curing treatment. When two or more curing treatments (drying, cross-linking, polymerization, etc.) are carried out, these can be carried out simultaneously or in multiple stages.
- a final copolymerization reaction is typically performed as the curing treatment. That is, the partial polymer is subjected to a further copolymerization reaction to form a complete polymer.
- a photocurable pressure-sensitive adhesive composition light irradiation is carried out. Curing treatments such as cross-linking and drying may be performed as necessary.
- the composition is dried. It is preferable to perform photocuring after curing.
- a pressure-sensitive adhesive composition using a complete polymer is typically subjected to drying (heat drying), cross-linking, etc. as necessary as the above curing treatment.
- drying heat drying
- photocuring is preferably performed after drying the composition.
- "after drying the composition” may be after bonding the below-described pressure-sensitive adhesive sheet obtained through the drying to an adherend.
- the pressure-sensitive adhesive sheet described later can be used in a mode in which it is attached to the adherend by a technique including photocuring after being attached to the adherend.
- a pressure-sensitive adhesive layer with a multi-layer structure of two or more layers can be produced by pasting together pre-formed pressure-sensitive adhesive layers.
- the pressure-sensitive adhesive composition may be applied onto a previously formed first pressure-sensitive adhesive layer, and the pressure-sensitive adhesive composition may be cured to form the second pressure-sensitive adhesive layer.
- the photo-curable pressure-sensitive adhesive layer is a part of the multilayer structure. It may be a layer (eg, one layer) or all layers.
- Application of the pressure-sensitive adhesive composition can be carried out using a conventional coater such as a gravure roll coater, a reverse roll coater, a kiss roll coater, a dip roll coater, a bar coater, a knife coater, and a spray coater.
- a conventional coater such as a gravure roll coater, a reverse roll coater, a kiss roll coater, a dip roll coater, a bar coater, a knife coater, and a spray coater.
- a direct method of forming a pressure-sensitive adhesive layer by directly applying a pressure-sensitive adhesive composition to the substrate may be used as a method of providing the pressure-sensitive adhesive layer on the substrate.
- a transfer method of transferring the pressure-sensitive adhesive layer formed on the release surface to the substrate may be used.
- the thickness of the adhesive layer is not particularly limited, and can be, for example, about 3 ⁇ m to 2000 ⁇ m. From the viewpoint of adhesion to the adherend such as step conformability, in some embodiments, the thickness of the pressure-sensitive adhesive layer may be, for example, 5 ⁇ m or more, suitably 10 ⁇ m or more, preferably 15 ⁇ m or more, or more. It is preferably 25 ⁇ m or more. The thickness of the pressure-sensitive adhesive layer may be 50 ⁇ m or more, more than 50 ⁇ m, 70 ⁇ m or more, 100 ⁇ m or more, or 120 ⁇ m or more.
- the thickness of the pressure-sensitive adhesive layer is preferably 5 ⁇ m or more, more preferably 10 ⁇ m or more, and 20 ⁇ m or more. More preferably, 50 ⁇ m or more is particularly preferable. Moreover, it may be 70 ⁇ m or more, 100 ⁇ m or more, or 120 ⁇ m or more.
- the thickness of the adhesive layer may be, for example, 1000 ⁇ m or less, 700 ⁇ m or less, or 500 ⁇ m or less. , 300 ⁇ m or less, 200 ⁇ m or less, or 170 ⁇ m or less.
- the technique according to this aspect can also be suitably implemented in the form of an adhesive sheet described later, in which the thickness of the adhesive layer is 130 ⁇ m or less, 90 ⁇ m or less, or 60 ⁇ m or less (for example, 40 ⁇ m or less).
- the thickness of the pressure-sensitive adhesive layer refers to the thickness of the pressure-sensitive adhesive layer from the pressure-sensitive adhesive surface that is attached to the adherend to the surface opposite to the pressure-sensitive adhesive surface. refers to the thickness of
- a pressure-sensitive adhesive sheet of one embodiment of the present invention has the pressure-sensitive adhesive layer. Since the pressure-sensitive adhesive sheet of the present embodiment is sheet-like and can be applied to locations where water leakage is expected, it has good workability compared to pastes, adhesives, and the like.
- the pressure-sensitive adhesive sheet of the present embodiment may be a pressure-sensitive adhesive sheet with a substrate having a pressure-sensitive adhesive layer on one or both sides of a sheet-shaped substrate (support), and the pressure-sensitive adhesive layer is held by a release sheet. It may be a substrate-less pressure-sensitive adhesive sheet such as
- the concept of the adhesive sheet as used herein can include what is called an adhesive tape, an adhesive label, an adhesive film, and the like.
- the pressure-sensitive adhesive layer is typically formed continuously, but is not limited to such a form.
- the pressure-sensitive adhesive layer is formed in a regular or random pattern such as dots or stripes.
- the pressure-sensitive adhesive sheet of the present embodiment may be roll-shaped or sheet-shaped. Alternatively, it may be a pressure-sensitive adhesive sheet processed into various shapes.
- a pressure-sensitive adhesive sheet may be a pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer on a substrate. That is, it may be in the form of a substrate-attached pressure-sensitive adhesive sheet containing a substrate bonded to the other back surface of the pressure-sensitive adhesive layer.
- FIG. 2 shows a schematic cross-sectional view of a configuration example in which an adhesive layer is formed on one side of a substrate in the adhesive sheet of one embodiment of the present invention.
- the adhesive sheet 20 shown in FIG. 2 includes a substrate 22 and an adhesive layer 21 formed on one side of the substrate.
- FIG. 3 shows a schematic cross-sectional view of a configuration example in which pressure-sensitive adhesive layers are formed on both sides of a base material.
- the adhesive sheet 30 shown in FIG. 3 includes a substrate 32 and a first adhesive layer 31 a and a second adhesive layer 31 b formed on both sides of the substrate 32 .
- the material of the base material is not particularly limited, and can be appropriately selected according to the usage of the adhesive sheet.
- substrates that can be used include polyolefin films mainly composed of polyolefins such as polypropylene and ethylene-propylene copolymers, polyester films mainly composed of polyesters such as polyethylene terephthalate and polybutylene terephthalate, Plastic films such as polyvinyl chloride films containing polyvinyl chloride as the main component; Foam sheets made of foams such as polyurethane foam, polyethylene foam, polychloroprene foam; Synthetic fibers such as polyester and vinylon, semi-synthetic fibers such as acetate, etc.) Woven fabric and non-woven fabric by single or blended spinning; Paper such as Japanese paper, fine paper, kraft paper, crepe paper; Aluminum foil, copper metal foil such as foil; A base material having a structure in which these are combined may be used.
- Examples of such a composite structure base material include a base material having a structure in which a metal foil and the plastic film are laminated, and a plastic sheet reinforced with inorganic fibers such as glass cloth.
- the substrate used for the pressure-sensitive adhesive sheet of one embodiment of the present invention is preferably a substrate that does not discolor due to water or steam. Because the base material does not discolor due to water or steam, when the adhesive sheet is attached to the location where water leakage is assumed, there is no risk of discoloration of the base material due to water or steam generated from other than the location where water leakage is assumed. , it is possible to accurately detect the leakage of water or steam from the assumed leakage location.
- the base material is preferably a material with high transparency from the viewpoint that the change in appearance when discolored is remarkable.
- the support film may be a porous film such as a foam film or a non-woven fabric sheet, or may be a non-porous film, in which a porous layer and a non-porous layer are laminated. It may be a structured film.
- the support film one containing a resin film that can independently maintain its shape (self-supporting or independent) as a base film can be preferably used.
- resin film means a non-porous structure, typically a voidless resin film that does not contain air bubbles. Therefore, the resin film is a concept that is distinguished from foam films and nonwoven fabrics.
- the resin film may have a single-layer structure or a multilayer structure of two or more layers (for example, a three-layer structure).
- Examples of the resin material constituting the resin film include polyester, polyolefin, polycycloolefin derived from a monomer having an alicyclic structure such as norbornene structure, nylon 6, nylon 66, and polyamide (PA) such as partially aromatic polyamide.
- polyester polyolefin
- nylon 6, nylon 66 polyamide
- PA polyamide
- polyimide polyimide
- PAI polyamideimide
- PEEK polyetheretherketone
- PES polyethersulfone
- PPS polyphenylene sulfide
- PC polycarbonate
- PU ethylene-vinyl acetate copolymer
- EVA ethylene-vinyl acetate copolymer
- polystyrene polyvinyl chloride, polyvinylidene chloride, fluororesins such as polytetrafluoroethylene (PTFE), acrylic resins such as polymethyl methacrylate, cellulose polymers such as diacetyl cellulose and triacetyl cellulose, vinyl butyral polymers , an arylate-based polymer, a polyoxymethylene-based polymer, an epoxy-based polymer, and the like can be used.
- the resin film may be formed using a resin material containing only one of such resins, or may be formed using a resin material in which two or more of these resins are blended. good too.
- the resin film may be unstretched or may be stretched (for example, uniaxially stretched or biaxially stretched).
- Preferable examples of the resin material that constitutes the resin film include polyester-based resin, PPS resin and polyolefin-based resin.
- the polyester-based resin refers to a resin containing polyester at a rate exceeding 50% by weight.
- PPS resin refers to a resin containing PPS in a proportion exceeding 50% by weight
- polyolefin resin refers to a resin containing polyolefin in a proportion exceeding 50% by weight
- polyester-based resin a polyester-based resin containing polyester obtained by polycondensation of a dicarboxylic acid and a diol as a main component is typically used.
- polyester resins include polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), polybutylene naphthalate, and the like.
- polyolefin-based resin one type of polyolefin can be used alone, or two or more types of polyolefin can be used in combination.
- the polyolefin may be, for example, an ⁇ -olefin homopolymer, a copolymer of two or more ⁇ -olefins, a copolymer of one or more ⁇ -olefins and other vinyl monomers, and the like.
- PE polyethylene
- PP polypropylene
- PP poly-1-butene
- EPR ethylene-propylene rubber
- ethylene-propylene- Examples include butene copolymers, ethylene-butene copolymers, ethylene-vinyl alcohol copolymers, ethylene-ethyl acrylate copolymers, and the like.
- polyolefin resin films include unstretched polypropylene (CPP) film, biaxially stretched polypropylene (OPP) film, low density polyethylene (LDPE) film, linear low density polyethylene (LLDPE) film, and medium density polyethylene (MDPE) film.
- CPP unstretched polypropylene
- OPP biaxially stretched polypropylene
- LDPE low density polyethylene
- LLDPE linear low density polyethylene
- MDPE medium density polyethylene
- HDPE high-density polyethylene
- PE polyethylene
- PE polyethylene
- PE polyethylene
- PE polyethylene
- PE polyethylene
- PE polypropylene
- PE polyethylene
- PET film, PEN film, PPS film and PEEK film are preferred examples from the viewpoint of strength.
- a preferred example is a PET film from the viewpoint of availability, dimensional stability, optical properties, and the like.
- additives such as light stabilizers, antioxidants, antistatic agents, colorants (dyes, pigments, etc.), fillers, slip agents, antiblocking agents, etc.
- the blending amount of the additive is not particularly limited, and can be appropriately set according to the use of the pressure-sensitive adhesive sheet.
- the method of manufacturing the resin film is not particularly limited.
- conventionally known general resin film forming methods such as extrusion molding, inflation molding, T-die casting, and calendar roll molding can be appropriately employed.
- the base material may be substantially composed of such a resin film.
- the substrate may contain an auxiliary layer in addition to the resin film.
- the auxiliary layers include optical property adjusting layers (e.g., antireflection layers), printed layers and laminate layers for imparting desired appearance to substrates or pressure-sensitive adhesive sheets, antistatic layers, undercoat layers, and release layers. and other surface treatment layers.
- the base material may be an optical member to be described later.
- the thickness of the base material is not particularly limited, and can be selected according to the purpose and mode of use of the adhesive sheet.
- the thickness of the substrate may be, for example, 1000 ⁇ m or less, 500 ⁇ m or less, 100 ⁇ m or less, 70 ⁇ m or less, 50 ⁇ m or less, 25 ⁇ m or less, 10 ⁇ m or less, or 5 ⁇ m or less.
- the thickness of the substrate may be, for example, 2 ⁇ m or more, and may be more than 5 ⁇ m or more than 10 ⁇ m. In some aspects, the thickness of the substrate can be, for example, 20 ⁇ m or greater, 35 ⁇ m or greater, or 55 ⁇ m or greater.
- the surface of the substrate that is to be bonded to the adhesive layer may be subjected to corona discharge treatment, plasma treatment, ultraviolet irradiation treatment, acid treatment, alkali treatment, primer application, and antistatic treatment, if necessary.
- a conventionally known surface treatment such as the above may be applied.
- Such a surface treatment can be a treatment for improving the adhesion between the substrate and the adhesive layer, in other words, the anchoring property of the adhesive layer to the substrate.
- composition of the primer is not particularly limited, and can be appropriately selected from known ones.
- the thickness of the undercoat layer is not particularly limited, it is usually suitably about 0.01 ⁇ m to 1 ⁇ m, preferably about 0.1 ⁇ m to 1 ⁇ m.
- the surface of the substrate opposite to the side to be bonded to the pressure-sensitive adhesive layer (hereinafter also referred to as the back surface) may be subjected to peeling treatment, adhesion or stickiness improvement treatment, antistatic treatment, etc. as necessary.
- a conventionally known surface treatment may be applied.
- the unwinding force of the pressure-sensitive adhesive sheet wound into a roll can be reduced by surface-treating the back surface of the substrate with a release agent.
- release agents examples include silicone-based release agents, long-chain alkyl-based release agents, olefin-based release agents, fluorine-based release agents, fatty acid amide-based release agents, molybdenum sulfide, and silica powder. .
- the pressure-sensitive adhesive layer may be protected by a release liner (separator, release film) until use.
- release liner a conventional release paper or the like can be used, and is not particularly limited. etc. can be used.
- substrates having a release treatment layer include plastic films and papers surface-treated with release agents such as silicone, long-chain alkyl, fluorine, and molybdenum sulfide.
- fluorine-based polymers for low-adhesive substrates made of fluorine-based polymers include polytetrafluoroethylene, polychlorotrifluoroethylene, polyvinyl fluoride, polyvinylidene fluoride, tetrafluoroethylene-hexafluoropropylene copolymer, chloro A fluoroethylene/vinylidene fluoride copolymer and the like can be mentioned.
- non-polar polymers for low-adhesive substrates made of non-polar polymers include olefin-based resins (eg, polyethylene, polypropylene, etc.).
- the release liner can be formed by a known or commonly used method. Also, the thickness of the release liner is not particularly limited.
- the peel strength of the adhesive sheet measured by the method of Examples described later may be, for example, 0.5 N/25 mm or more, and usually 1 N/25 mm or more. From the viewpoint of improving bonding reliability, the peel strength is preferably, for example, 2 N/25 mm or more, and more preferably 5 N/25 mm or more.
- the haze value of the adhesive sheet is suitably about 10% or less, and may be about 5% or less (for example, about 3% or less).
- the haze value is preferably 1.0% or less.
- Such highly transparent pressure-sensitive adhesive sheets are preferable in the present invention from the viewpoint that the change in appearance is remarkable when the sheet is discolored or colored.
- the haze value of the adhesive sheet may be less than 1.0%, less than 0.7%, or less than 0.5% (for example, 0 to 0.5%).
- haze values for the adhesive sheet can also be preferably applied to the haze value for the adhesive layer in the technology according to this embodiment.
- haze value refers to the ratio of diffuse transmitted light to the total transmitted light when the object to be measured is irradiated with visible light. Also called cloudiness value.
- Th is the haze value [%]
- Td is the scattered light transmittance
- Tt is the total light transmittance.
- a haze value can be measured using a haze meter according to a known method. The haze value can be adjusted, for example, by selecting the composition, thickness, etc. of the pressure-sensitive adhesive layer.
- the technology according to this aspect can be preferably used, for example, for electronic member applications, optical member applications, building member applications, and the like.
- a method for detecting the presence of water or steam is characterized by attaching the above-described pressure-sensitive adhesive sheet to an adherend and detecting the presence of water or steam at the attachment site.
- the above-mentioned pressure-sensitive adhesive sheet is attached so as to cover the expected water leakage location of the adherend, thereby detecting leakage of water or steam at the location where the adhesive sheet is attached.
- leakage of water or steam may be simply referred to as "leakage”.
- the adhesive sheet by attaching the adhesive sheet to a portion of the adherend where water leakage is assumed in advance, water leakage from the attached portion can be prevented (water stoppage), and water leakage can be prevented.
- water stoppage water leakage from the attached portion
- water leakage can be prevented.
- the presence or leakage of water or steam can be detected by coloring the adhesive layer of the adhesive sheet.
- the adherend is not particularly limited as long as it is expected to leak water, and includes various products.
- various products for example, automobiles, ships, aircraft, railroad vehicles, buildings, home appliances, electronic equipment, electrical products, water pipes and hoses, plumbing such as baths, toilets, and sinks, and their partial components (configurations in the process of being manufactured) including goods) and the like.
- the assumed water leakage location means a location where water leakage is expected or likely to occur in the adherend, for example, the joint between members in the adherend, the Examples include gaps (voids), defects during product design, damaged points during use, damaged/defective points due to aged deterioration, and the like.
- parts means parts by mass.
- Example 1 [Preparation of adhesive composition] 65 parts of n-butyl acrylate (BA), 15 parts of N-vinyl-2-pyrrolidone (NVP) and 4-hydroxybutyl acrylate were added as monomer components to a reaction vessel equipped with a cooling tube, a nitrogen inlet tube, a thermometer and a stirring device. 20 parts of (4HBA), 0.1 part of ⁇ -thioglycerol as a chain transfer agent, and 122 parts of ethyl acetate as a polymerization solvent were charged, and 0.2 parts of azobisisobutyronitrile (AIBN) was added as a thermal polymerization initiator.
- BA n-butyl acrylate
- NDP N-vinyl-2-pyrrolidone
- 4-hydroxybutyl acrylate 4-hydroxybutyl acrylate
- a solution containing acrylic polymer A was obtained by performing solution polymerization in a nitrogen atmosphere.
- an isocyanate cross-linking agent (trade name “Takenate D110N”, manufactured by Mitsui Chemicals, Inc.) is added to 100 parts of the acrylic polymer A, and dioctyltin dilaurate (manufactured by Tokyo Fine Chemicals Co., Ltd., Enbi) is added as a cross-linking catalyst.
- 0.01 part of Riser OL-1, 1% by weight ethyl acetate solution) and 5 parts of cobalt chloride dissolved in methanol were added, followed by defoaming to obtain an acrylic pressure-sensitive adhesive composition. .
- a polyethylene terephthalate film having a thickness of 38 ⁇ m and having one side treated with silicone for release manufactured by Mitsubishi Chemical Corporation, product name “MRE #38”;
- the coating layer was coated so that the release-treated surface of the second release liner was on the coating layer side to obtain a pressure-sensitive adhesive sheet of Example 1 having a thickness of the pressure-sensitive adhesive layer of 50 ⁇ m.
- Example 2 PSA compositions and PSA sheets of Examples 2 to 4 were obtained in the same manner as in Example 1, except that the amount of cobalt chloride added was changed as shown in Table 1.
- Comparative example 1 A pressure-sensitive adhesive composition and a pressure-sensitive adhesive sheet of Comparative Example 1 were obtained in the same manner as in Example 1, except that cobalt chloride was not used.
- Comparative example 2 A pressure-sensitive adhesive composition and a pressure-sensitive adhesive sheet of Comparative Example 2 were obtained in the same manner as in Comparative Example 1, except that a solution containing an acrylic polymer was prepared as follows. A reaction vessel equipped with a cooling tube, a nitrogen inlet tube, a thermometer and a stirring device is charged with 100 parts of n-butyl acrylate (BA) and 5 parts of acrylic acid (AA) as monomer components and 122 parts of toluene as a polymerization solvent, A solution containing acrylic polymer B was obtained by adding 0.2 part of azobisisobutyronitrile (AIBN) as a thermal polymerization initiator and carrying out solution polymerization in a nitrogen atmosphere.
- AIBN azobisisobutyronitrile
- ⁇ indicates that cobalt chloride dissolved in methanol was compatible with the base pressure-sensitive adhesive (acrylic polymer A), and x indicates that it was not compatible.
- Table 1 shows the results.
- the pressure-sensitive adhesive composition of the comparative example that does not contain cobalt chloride is indicated with "-".
- ⁇ Discoloration test A> One release liner (second release liner) of the resulting adhesive sheet was peeled off, and transferred to a 50 ⁇ m thick PET film (manufactured by Toray, Lumirror S10#50) as a substrate with a hand roller, and a sample of the adhesive tape was obtained. Obtained.
- the other release liner (first release liner) of the resulting adhesive tape sample was peeled off, and the adhesive layer was exposed and stored in an environment of 40°C and 92% RH for 5 minutes. Color change was evaluated visually. Those with discoloration were evaluated as ⁇ , and those without discoloration were evaluated as x. Table 1 shows the results.
- ⁇ Discoloration test B> One release liner (second release liner) of the resulting adhesive sheet was peeled off, and transferred to a 50 ⁇ m thick PET film (manufactured by Toray, Lumirror S10#50) as a substrate with a hand roller, and a sample of the adhesive tape was obtained. Obtained.
- the other release liner (first release liner) of the obtained adhesive tape sample was peeled off, and the through holes were covered with a 1 mm thick acrylic plate (manufactured by Mitsubishi Chemical, Acrylite) having through holes of 8 mm diameter.
- a tape was affixed, and 300 ⁇ L of water was applied to the through holes from the side of the acrylic plate to which the tape was not affixed. After 5 minutes, the color change of the pressure-sensitive adhesive layer was visually evaluated. Those with discoloration were evaluated as ⁇ , and those without discoloration were evaluated as x. Table 1 shows the results.
- the release liner on one side of the adhesive sheet sandwiched between the release liners on both sides was peeled off, and one side of the adhesive layer was exposed. kept. Then, within 1 minute after taking out from the storage environment, bonding to non-alkali glass and setting the sample to a UV-visible spectrophotometer were completed, and the transmission spectrum in the visible light region from 380 nm to 780 nm was measured. From the obtained transmission spectrum, the minimum light transmittance at a wavelength of 600 nm or more and 700 nm or less after discoloration test A was read. Table 1 shows the results.
- the minimum transmittance in the wavelength range before discoloration test A was 30% or less, and the minimum transmittance in the wavelength range after discoloration test A was 70% or more. was evaluated as ⁇ . Table 1 shows the results.
- the second release liner was peeled off from the resulting pressure-sensitive adhesive sheet, and a single-sided pressure-sensitive adhesive sheet was produced by laminating a corona-treated PET film having a thickness of 100 ⁇ m. This was cut into a size of 25 mm in width and 100 mm in length to prepare a test piece.
- the first release liner was peeled off from the test piece, and the exposed adhesive surface was applied to a glass plate (manufactured by Corning, Gorilla Glass 3) as an adherend with a 2 kg rubber roller. It was crimped by reciprocating once. This was autoclaved (50° C., 0.5 MPa, 15 minutes).
- the pressure-sensitive adhesive compositions of Examples had compatibility between the water-discoloring material (cobalt chloride) and the acrylic polymer, and that they discolored when exposed to water or steam.
- the pressure-sensitive adhesive compositions of Examples provided sufficient peel strength even when containing a water-discoloring material.
- the pressure-sensitive adhesive composition of the example was used, no water leakage was observed in both discoloration test A and discoloration test B, and it was confirmed that the pressure-sensitive adhesive composition had a waterproof function.
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Abstract
Description
2.さらに極性溶媒を含む、前記1に記載の粘着剤組成物。
3.前記極性溶媒が、アルコール、ケトン、および窒素原子を分子内に含む芳香族化合物の少なくとも1種を含む、前記2に記載の粘着剤組成物。
4.前記ベースポリマーがアクリル系ポリマーを含む、前記1~3のいずれか1に記載の粘着剤組成物。
5.前記水または水蒸気により変色する材料が、水分子が配位できる遷移金属化合物を含む、前記1~4のいずれか1に記載の粘着剤組成物。
6.前記水分子が配位できる遷移金属化合物が塩化コバルトである、前記5に記載の粘着剤組成物。
7.前記1~6のいずれか1に記載の粘着剤組成物からなる粘着剤層を備える粘着シート。
8.前記粘着剤層が基材上に備えられた、前記7に記載の粘着シート。
9.漏水想定箇所からの水または水蒸気の漏洩を検知するための、前記7または8に記載の粘着シート。
10.ベースポリマー、及び、水または水蒸気により変色する材料を含む、粘着剤組成物の製造方法であって、
極性溶媒に水または水蒸気により変色する材料を溶解させる工程、及び
前記極性溶媒に溶解させた前記水または水蒸気により変色する材料を、ベースポリマー溶液に添加する工程、
を含む、粘着剤組成物の製造方法。
11.前記7~9のいずれか1に記載の粘着シートを被着体に貼り付け、当該貼り付け箇所における水または水蒸気の存在を検知する方法。
本発明の一実施形態の粘着剤組成物は、ベースポリマー、及び、水または水蒸気により変色する材料を含有することを特徴とする。
本態様に係る粘着剤組成物において、粘着剤組成物を構成するベースポリマーとしては特に限定されず、粘着剤に用いられる公知のポリマーを用いることが可能である。
N-ブチルイタコンイミド、N-オクチルイタコンイミド、N-2-エチルへキシルイタコンイミド、N-シクロへキシルイタコンイミド、N-ラウリルイタコンイミド等。
1/Tg=Σ(Wi/Tgi)
n-ブチルアクリレート -55℃
イソステアリルアクリレート -18℃
メチルメタクリレート 105℃
メチルアクリレート 8℃
シクロヘキシルアクリレート 15℃
N-ビニル-2-ピロリドン 54℃
2-ヒドロキシエチルアクリレート -15℃
4-ヒドロキシブチルアクリレート -40℃
ジシクロペンタニルメタクリレート 175℃
イソボルニルアクリレート 94℃
アクリル酸 106℃
メタクリル酸 228℃
SP値δ=(Σ△e/Σ△v)1/2
(上式中、Δeは、25℃における各原子または原子団の蒸発エネルギー△eであり、Δvは、同温度における各原子または原子団のモル容積である。);にしたがって計算することができる。上記SP値を有するアクリル系ポリマーは、当業者の技術常識に基づき、適切にモノマー組成を決定することにより得ることができる。
本発明の一実施形態の粘着剤組成物は、水または水蒸気により変色する材料(以下、水変色材ともいう)を含む。水変色材は、水または水蒸気により変色するものであれば、その種類は限定されない。
本発明の一実施態様の粘着剤組成物は、剥離力上昇剤を含むものであり得る。上記剥離力上昇剤としては、上記粘着剤組成物から形成される粘着剤層の表面(粘着面)を被着体に貼り付けた後に、粘着シートの被着体からの剥離力を上昇させる機能を発揮し得る材料を、適宜選択して用いることができる。
本発明の一実施態様の粘着剤組成物は、主に粘着剤層内での架橋または粘着剤層とその隣接面との架橋を目的として、必要に応じて架橋剤を含有させることができる。
本発明の一実施態様の粘着剤組成物(ひいては粘着剤層)には、凝集力の向上や、粘着剤層に隣接する面(例えば、基材の表面等であり得る。)との接着性向上等の観点から、アクリル系オリゴマーを含有させることができる。
本発明の一実施態様の粘着剤組成物は、本発の効果が阻害されない範囲において、必要に応じ、粘着付与樹脂(例えば、ロジン系、石油系、テルペン系、フェノール系、ケトン系等の粘着付与樹脂)、粘度調整剤(例えば増粘剤)、レベリング剤、可塑剤、充填剤、顔料や染料等の着色剤、安定剤、防腐剤、老化防止剤等の粘着剤組成物の分野において一般的な各種の添加剤をその他の任意成分として含み得る。このような各種添加剤については、従来公知のものを常法により使用することができ、特に本発明を特徴づけるものではないので、詳細な説明は省略する。
本発明の一実施形態の粘着剤組成物の製造方法は、極性溶媒に水または水蒸気により変色する材料を溶解させる工程、及び、前記極性溶媒に溶解させた前記水または水蒸気により変色する材料を、ベースポリマー溶液に添加する工程、を含む。
本発明の一実施形態の粘着剤層は上記粘着剤組成物から形成される。図1に本発明の一実施形態の粘着剤層の一構成例の模式的な断面図を示す。
本発明の一実施形態の粘着シートは上記粘着剤層を有する。本実施形態の粘着シートは、シート状で漏水が想定される箇所に適用できるため、ペーストや接着剤等と比較して施工性が良好である。
いくつかの態様に係る粘着シートは、粘着剤層が基材上に備えられた粘着シートであり得る。すなわち粘着剤層の他方の背面に接合した基材を含む基材付き粘着シートの形態であり得る。
本実施形態の粘着シートにおいては、使用時まで上記粘着剤層がはく離ライナー(セパレータ、剥離フィルム)により保護されていてもよい。
Th[%]=Td/Tt×100
上記式において、Thはヘイズ値[%]であり、Tdは散乱光透過率、Ttは全光透過率である。ヘイズ値の測定は、ヘイズメータを用いて、公知の方法にしたがって行うことができる。ヘイズ値は、例えば、粘着剤層の組成や厚さ等の選択によって調節することができる。
本発明の一実施態様の水または水蒸気の存在を検知する方法は、上述の粘着シートを被着体に貼り付け、当該貼り付け箇所における水または水蒸気の存在を検知することを特徴とする。好ましくは、被着体の漏水想定箇所を覆うように上述の粘着シートを貼り付けることで、当該貼り付け箇所における水または水蒸気の漏洩を検知する。以下、水または水蒸気の漏洩を単に「漏水」と表記することもある。
[粘着剤組成物の作製]
冷却管、窒素導入管、温度計および撹拌装置を備えた反応容器に、モノマー成分としてn-ブチルアクリレート(BA)65部、N-ビニル-2-ピロリドン(NVP)15部、4-ヒドロキシブチルアクリレート(4HBA)20部と、連鎖移動剤としてα-チオグリセロール0.1部、重合溶媒として酢酸エチル122部を仕込み、熱重合開始剤としてアゾビスイソブチロニトリル(AIBN)0.2部を投入して窒素雰囲気下で溶液重合を行うことにより、アクリル系ポリマーAを含有する溶液を得た。
当該溶液に、アクリル系ポリマーA100部に対し、イソシアネート系架橋剤(商品名「タケネートD110N」、三井化学株式会社製)を1.2部、架橋触媒としてジラウリン酸ジオクチルスズ(東京ファインケミカル社製、エンビライザーOL-1、1重量%酢酸エチル溶液)を0.01部、さらに、メタノールに溶解させた塩化コバルトを5部添加し、その後、脱泡して、アクリル系の粘着剤組成物を得た。
得られたアクリル系の粘着剤組成物を、片面をシリコーンで剥離処理した厚み38μmのポリエチレンテレフタレートフィルム(三菱ケミカル株式会社製、製品名「MRF#38」;第1はく離ライナー)上に、乾燥時の厚みが50μmとなるようにアプリケーターを用いて塗布し、塗布層を形成した。
次いで、130℃の乾燥機に3分間入れて乾燥させ、乾燥機から取り出した後、片面をシリコーンで剥離処理した厚み38μmのポリエチレンテレフタレートフィルム(三菱ケミカル株式会社製、製品名「MRE#38」;第2はく離ライナー)の剥離処理面が上記塗布層側になるように塗布層を被覆して、粘着剤層の厚み50μmである実施例1の粘着シートを得た。
塩化コバルトの添加量を表1に示すように変更したことを除いては、実施例1と同様にして、実施例2~4の粘着剤組成物および粘着シートを得た。
塩化コバルトを使用しなかったことを除いては、実施例1と同様にして、比較例1の粘着剤組成物および粘着シートを得た。
アクリル系ポリマーを含有する溶液を以下のようにして調製したことを除いては、比較例1と同様にして、比較例2の粘着剤組成物および粘着シートを得た。
冷却管、窒素導入管、温度計および撹拌装置を備えた反応容器に、モノマー成分としてn-ブチルアクリレート(BA)100部、アクリル酸(AA)5部と、重合溶媒としてトルエン122部を仕込み、熱重合開始剤としてアゾビスイソブチロニトリル(AIBN)0.2部を投入して窒素雰囲気下で溶液重合を行うことにより、アクリル系ポリマーBを含有する溶液を得た。
実施例の粘着剤組成物において、メタノールに溶解させた塩化コバルトがベース粘着剤(アクリル系ポリマーA)に相溶したものは〇、相溶しなかったものを×とした。結果を表1に示す。なお、表1中、塩化コバルトを含有しない比較例の粘着剤組成物においては、「-」と表記した。
得られた粘着シートの一方のはく離ライナー(第2はく離ライナー)を剥がし、基材である厚さ50μmのPETフィルム(東レ製、ルミラーS10#50)にハンドローラーで転写し、粘着テープのサンプルを得た。得られた粘着テープのサンプルのもう一方のはく離ライナー(第1はく離ライナー)を剥がし、粘着剤層をむき出しにした状態で40℃92%RHの環境に保管し、5分後の粘着剤層の色変化を目視で評価した。変色したものは○、変色しなかったものは×とした。結果を表1に示す。
得られた粘着シートの一方のはく離ライナー(第2はく離ライナー)を剥がし、基材である厚さ50μmのPETフィルム(東レ製、ルミラーS10#50)にハンドローラーで転写し、粘着テープのサンプルを得た。得られた粘着テープのサンプルのもう一方のはく離ライナー(第1はく離ライナー)を剥がし、8mmφの貫通孔が開いた1mm厚のアクリル板(三菱ケミカル製、アクリライト)に貫通孔を覆うようにしてテープを貼り、アクリル板のテープを貼っていない面から貫通孔に水300μLを付着させ、5分後の粘着剤層の色変化を目視で評価した。変色したものは○、変色しなかったものは×とした。結果を表1に示す。
得られた粘着シートの片面のはく離ライナーを剥離して、粘着シートを無アルカリガラス板に貼り合わせた後、他方の面のはく離ライナーを剥離し、紫外-可視分光光度計(日立ハイテク製「U-4100」)により380nm~780nmの可視光域の透過スペクトルを測定した。得られた透過スペクトルから、変色試験A前の、波長600nm以上700nm以下における最小の光透過率を読み取った。結果を表1に示す。
得られた粘着シートから第2はく離ライナーを剥がし、コロナ処理された厚さ100μmのPETフィルムに貼り合わせて片面粘着シートを作製した。これを幅25mm、長さ100mmのサイズにカットして試験片を作製した。
23℃、50%RHの環境下において、上記試験片から第1はく離ライナーを剥がし、露出した粘着面を被着体としてのガラス板(コーニング社製、ゴリラガラス3)に、2kgのゴムローラーを一往復させて圧着した。これにオートクレーブ処理(50℃、0.5MPa、15分)を行った。
その後、23℃、50%RHの環境下において、引張試験機(ミネベア社製、万能引張圧縮試験機、装置名「引張圧縮試験機、TCM-1kNB」)を用いて、引張速度300mm/分、剥離角度180度の条件で試験片のガラス板からの剥離強度(180°剥離力)を測定した。測定は3回行い、それらの平均値を表1に示す。
また、実施例の粘着剤組成物は、水変色材を含有する場合であっても、十分な剥離強度が得られた。
また、実施例の粘着剤組成物を用いた場合、変色試験Aおよび変色試験Bのいずれの試験でも、水漏れは確認されず、止水機能を備えることを確認できた。
11、21 粘着剤層
22、32 基材
31a 第1粘着剤層
31b 第2粘着剤層
Claims (11)
- ベースポリマー、及び、水または水蒸気により変色する材料を含む、粘着剤組成物。
- さらに極性溶媒を含む、請求項1に記載の粘着剤組成物。
- 前記極性溶媒が、アルコール、ケトン、および窒素原子を分子内に含む芳香族化合物の少なくとも1種を含む、請求項2に記載の粘着剤組成物。
- 前記ベースポリマーがアクリル系ポリマーを含む、請求項1~3のいずれか1項に記載の粘着剤組成物。
- 前記水または水蒸気により変色する材料が、水分子が配位できる遷移金属化合物を含む、請求項1~4のいずれか1項に記載の粘着剤組成物。
- 前記水分子が配位できる遷移金属化合物が塩化コバルトである、請求項5に記載の粘着剤組成物。
- 請求項1~6のいずれか1項に記載の粘着剤組成物からなる粘着剤層を備える粘着シート。
- 前記粘着剤層が基材上に備えられた、請求項7に記載の粘着シート。
- 漏水想定箇所からの水または水蒸気の漏洩を検知するための、請求項7または8に記載の粘着シート。
- ベースポリマー、及び、水または水蒸気により変色する材料を含む、粘着剤組成物の製造方法であって、
極性溶媒に水または水蒸気により変色する材料を溶解させる工程、及び
前記極性溶媒に溶解させた前記水または水蒸気により変色する材料を、ベースポリマー溶液に添加する工程、
を含む、粘着剤組成物の製造方法。 - 請求項7~9のいずれか1項に記載の粘着シートを被着体に貼り付け、当該貼り付け箇所における水または水蒸気の存在を検知する方法。
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Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5837534U (ja) * | 1981-09-08 | 1983-03-11 | 株式会社東芝 | 水漏れ検出用テ−プ |
JPS6488129A (en) * | 1987-09-29 | 1989-04-03 | Nippon Oils & Fats Co Ltd | Sheet-like detecting material for inspecting leakage |
JPH05263050A (ja) * | 1992-03-23 | 1993-10-12 | New Oji Paper Co Ltd | 粘着テープまたはシート |
JPH0953056A (ja) * | 1995-08-09 | 1997-02-25 | Sekisui Chem Co Ltd | pH指示性粘着シート及びそれを用いた水浸透度の測定方法 |
US20180244959A1 (en) * | 2017-02-24 | 2018-08-30 | Boe Technology Group Co., Ltd. | Display panel, manufacturing method thereof and display device |
JP2019032312A (ja) * | 2017-08-08 | 2019-02-28 | 日東電工株式会社 | ガス検知エレメント |
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- 2022-02-03 WO PCT/JP2022/004266 patent/WO2022168916A1/ja active Application Filing
- 2022-02-08 TW TW111104470A patent/TW202242058A/zh unknown
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5837534U (ja) * | 1981-09-08 | 1983-03-11 | 株式会社東芝 | 水漏れ検出用テ−プ |
JPS6488129A (en) * | 1987-09-29 | 1989-04-03 | Nippon Oils & Fats Co Ltd | Sheet-like detecting material for inspecting leakage |
JPH05263050A (ja) * | 1992-03-23 | 1993-10-12 | New Oji Paper Co Ltd | 粘着テープまたはシート |
JPH0953056A (ja) * | 1995-08-09 | 1997-02-25 | Sekisui Chem Co Ltd | pH指示性粘着シート及びそれを用いた水浸透度の測定方法 |
US20180244959A1 (en) * | 2017-02-24 | 2018-08-30 | Boe Technology Group Co., Ltd. | Display panel, manufacturing method thereof and display device |
JP2019032312A (ja) * | 2017-08-08 | 2019-02-28 | 日東電工株式会社 | ガス検知エレメント |
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JPWO2022168916A1 (ja) | 2022-08-11 |
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