WO2016052276A1 - タッチパネル用粘着剤組成物、粘着シート、ならびに積層体 - Google Patents
タッチパネル用粘着剤組成物、粘着シート、ならびに積層体 Download PDFInfo
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- WO2016052276A1 WO2016052276A1 PCT/JP2015/076766 JP2015076766W WO2016052276A1 WO 2016052276 A1 WO2016052276 A1 WO 2016052276A1 JP 2015076766 W JP2015076766 W JP 2015076766W WO 2016052276 A1 WO2016052276 A1 WO 2016052276A1
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- 0 **(C(*(*)C(*1**=[N+][O-])=O)=O)C1=O Chemical compound **(C(*(*)C(*1**=[N+][O-])=O)=O)C1=O 0.000 description 2
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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
- C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
-
- 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
-
- 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
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2457/00—Electrical equipment
- B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
- B32B2457/208—Touch screens
Definitions
- the present invention relates to an adhesive composition for a touch panel, an adhesive sheet, and a laminate.
- a touch panel is often used in a severe environment (for example, in a high temperature and / or high humidity environment) such as in a car or outdoors, various types of touch panel units included in the touch panel are used.
- the adhesive that bonds the members is also required to exhibit stable characteristics even under severe conditions.
- the touch panel unit which is a laminate of various members, is disposed on the outermost surface of the screen, high transparency is required, and the adhesive layer included in the touch panel unit is exposed to moisture from the outside. Foaming is likely to occur. Moreover, foaming may occur in the pressure-sensitive adhesive layer due to gas such as water vapor or carbon dioxide generated from various members constituting the touch panel unit.
- the conductive film forming the wiring and the adhesive may be in direct contact. For this reason, the pressure-sensitive adhesive is required not to change the characteristics of the conductive film.
- the conductive film is generally formed of a metal or metal oxide such as indium tin oxide (ITO) or antimony tin oxide (ATO), corrosion occurs due to contact between the conductive film and the acid.
- ITO indium tin oxide
- ATO antimony tin oxide
- the known pressure-sensitive adhesive composition suppresses foaming under severe heat and humidity conditions while satisfying the requirements of high adhesive strength, high transparency, and properties that do not corrode conductive films (conductive film non-corrosive). Was very difficult.
- the present invention provides a pressure-sensitive adhesive composition for a touch panel, a pressure-sensitive adhesive sheet, and a laminate, which can suppress foaming under wet heat conditions, have excellent adhesive strength, durability, and transparency, and have non-corrosive properties for conductive films. provide.
- the present inventors can foam even under pressure and humidity conditions by using a specific cross-linking agent, even if it is a pressure-sensitive adhesive composition containing an acrylic polymer that does not substantially contain an acidic group. It was found that a pressure-sensitive adhesive composition excellent in transparency, adhesive strength, durability, and conductive film non-corrosiveness can be obtained.
- the pressure-sensitive adhesive composition for a touch panel includes (A) an acrylic polymer having a weight average molecular weight of 100,000 or more and less than 800,000 and containing substantially no acidic group, and (B) the following general formula: (1) or a crosslinking agent represented by the following general formula (2), wherein the (A) acrylic polymer comprises (a1) (meth) acrylic acid alkyl ester and (a2) hydroxyl group-containing monomer. It is a copolymer of monomer components to be included, and includes 0.04 parts by mass or more and 10 parts by mass or less of the (B) crosslinking agent with respect to 100 parts by mass of the (A) acrylic polymer.
- R 1A, R 1B, R 1C is independently a group containing a group represented by the group and / or the following general formula represented by the following general formula (3) (4), R 2A , R 2B and R 2C are groups represented by — (CH 2 ) 6 —.
- R 1A, R 1B, R 1C is independently a group containing a group represented by the group and / or the following general formula represented by the following general formula (3) (4), R 2A , R 2B , R 2C , R 3A , R 3B , R 3C , R 3D , R 3E , R 3F are groups represented by — (CH 2 ) 6 —.
- the monomer component includes (a1) (meth) acrylic acid alkyl ester of 45% by mass to 99% by mass and (a2) a hydroxyl group-containing monomer. 1% by mass or more and 40% by mass or less, and monomers other than the components (a1) and (a2), each having one olefinic double bond in the molecule 0% by mass or more and 15% by mass % Or less.
- the adhesive sheet for touch panels which concerns on 1 aspect of this invention has the adhesive composition for touch panels in any one of said 1 thru
- the laminated body which concerns on 1 aspect of this invention is a 1st base material, a 2nd base material, and the adhesive layer obtained from the adhesive composition for touchscreens in any one of said 1 thru
- the first base material and the second base material are bonded together via the pressure-sensitive adhesive layer, and the first base material and the second base material are each made of glass or resin. Including.
- the (A) acrylic polymer and the (B) cross-linking agent are included, and the (A) acrylic polymer is (a1) (meta A copolymer of a monomer component containing an acrylic acid alkyl ester and (a2) a hydroxyl group-containing monomer, and 0.04 parts of the crosslinking agent (B) is added to 100 parts by weight of the acrylic polymer (A).
- the (A) acrylic polymer is (a1) (meta A copolymer of a monomer component containing an acrylic acid alkyl ester and (a2) a hydroxyl group-containing monomer, and 0.04 parts of the crosslinking agent (B) is added to 100 parts by weight of the acrylic polymer (A).
- the pressure-sensitive adhesive sheet is obtained from the pressure-sensitive adhesive composition for touch panels according to the above 1 to 3, foaming under wet heat conditions is suppressed, and excellent in transparency, adhesive strength, durability, and conductive film non-corrosiveness. ing.
- the pressure-sensitive adhesive layer is excellent in elasticity due to the structure of the (B) crosslinking agent. ing. Thereby, this adhesive layer can escape the gas which arises from a 1st base material and a 2nd base material, and can suppress generation
- FIG. 1 is a cross-sectional view schematically showing a laminate according to an embodiment of the present invention.
- parts means “parts by mass” and “%” means “mass%” unless otherwise specified.
- the touch panel adhesive composition according to an embodiment of the present invention has a weight average molecular weight of 100,000 to less than 800,000. And an acrylic polymer (A) substantially free of acidic groups (hereinafter sometimes simply referred to as “component (A)”), and the following general formula (1) or the following general formula (2) And a cross-linking agent (B) represented by the formula (hereinafter sometimes simply referred to as “component (B)”).
- R 1A, R 1B, R 1C is independently a group containing a group represented by the group and / or the following general formula represented by the following general formula (3) (4), R 2A , R 2B and R 2C are groups represented by — (CH 2 ) 6 —.
- R 1A, R 1B, R 1C is independently a group containing a group represented by the group and / or the following general formula represented by the following general formula (3) (4), R 2A , R 2B , R 2C , R 3A , R 3B , R 3C , R 3D , R 3E , R 3F are groups represented by — (CH 2 ) 6 —.
- Component (A) includes (a1) (meth) acrylic acid alkyl ester (hereinafter sometimes simply referred to as “(a1) component”) and (a2) a hydroxyl group-containing monomer (hereinafter referred to as “a1”). It may be simply described as “component (a2)”). It is preferable that the component (a1) and the component (a2) do not have an acidic group.
- the “acrylic polymer” means at least one selected from acrylic acid, acrylic acid salt, acrylic acid ester, methacrylic acid, methacrylic acid salt, and methacrylic acid ester in a structural unit of 50% by mass or more. Refers to the polymer containing.
- a component does not contain an acidic group substantially.
- the component (A) does not have an acidic group means that in the monomer component, the content of the monomer having an acidic group is 0.5% by mass or less (preferably 0). Mass%), and preferably means that no monomer having an acidic group is artificially blended in the monomer component. More specifically, when the component (A) does not have an acidic group, the acid value of the component (A) is usually 0.5 mg / KOH or less.
- a component can prevent the corrosion of the electrically conductive film contained in a touchscreen by not containing an acidic group substantially.
- the “acidic group” in the present invention is not limited, and examples thereof include a carboxyl group, a sulfoxyl group, and a cyano group.
- the content of the component (A) in the pressure-sensitive adhesive composition (solid content excluding the solvent) according to this embodiment is 90 parts by mass or more and 99.9 parts by mass with respect to 100 parts by mass of the pressure-sensitive adhesive composition according to this embodiment. Part or less.
- the monomer component is (a1) from the viewpoint that the elasticity under wet heat conditions can be more reliably maintained and foaming under wet heat conditions can be further suppressed.
- the total amount of the (a1) component and the (a2) component in the monomer component is preferably 85% by mass or more and 100% by mass or less.
- the monomer component is a monomer other than the component (a1) and the component (a2), and has 0% by mass to 15% by mass of a monomer having one olefinic double bond in the molecule. The following may further be included.
- the suppression of foaming under wet heat conditions means that, for example, in a car, outdoors, a sauna, a bath, etc. under high temperature and / or high humidity conditions It means having durability in use.
- the pressure-sensitive adhesive layer obtained from the pressure-sensitive adhesive composition according to this embodiment is used under wet heat conditions. It is useful in that foaming is suppressed and it has adhesive strength, durability, transparency, and non-corrosiveness to the conductive film.
- a component can contribute to the adhesive force of the adhesive composition which concerns on this embodiment.
- the component (a1) can be represented by, for example, the following formula (5).
- R 1 represents a hydrogen atom or a methyl group
- R 2 represents an alkyl group or an aralkyl group.
- the alkyl group represented by R 2 may be linear or branched, for example, an alkyl group having 1 to 18 carbon atoms (for example, a methyl group or an ethyl group).
- the “aralkyl group” refers to an alkyl group in which one of the hydrogen atoms of the alkyl group is substituted with an aryl group.
- examples of the aralkyl group represented by R 2 include aralkyl groups having 1 to 18 carbon atoms (for example, benzyl group (phenylmethyl group), phenethyl group (phenylethyl group)). It is done.
- a component can be used 1 type or in combination of 2 or more types. Among these, since the monomer component can better maintain the adhesive strength, one or more selected from 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate and n-butyl acrylate are contained in the monomer component. It is preferable to contain 99% by mass or less (preferably) 99% by mass or less.
- component (a2) A component can react with (B) component and can contribute to formation of a crosslinked structure. More specifically, the hydroxyl group contained in the component (a2) reacts with the isocyanate group in the component (B) to form a crosslinked structure.
- the component (a2) examples include 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, 4-hydroxybutyl acrylate, 4-hydroxybutyl methacrylate, 2-hydroxy-3 -Hydroxyl-containing (meth) acrylates such as 2-chloropropyl acrylate, 2-hydroxy-3-chloropropyl methacrylate, 2-hydroxy-3-phenoxypropyl acrylate, 2-hydroxy-3-phenoxypropyl methacrylate, etc. Of these, one or a combination of two or more can be used. Among these, it is preferable to use a hydroxyl group-containing (meth) acrylic acid ester having 1 to 6 carbon atoms as the component (a2).
- Component (a3) The monomer component is a monomer other than the components (a1) and (a2), and has a single olefinic double bond in the molecule.
- a nitrogen-containing monomer hereinafter sometimes simply referred to as “component (a3)” may further contain 0% by mass to 7% by mass.
- the component (a3) examples include N, N-dimethylaminoethyl acrylate, N, N-dimethylaminoethyl methacrylate, N, N-diethylaminoethyl methacrylate, acrylamide, N, N-dimethylaminopropyl acrylamide, diacetone acrylamide, An acryloyl morpholine is mentioned, Among these, it can be used 1 type or in combination of 2 or more types. Among these, the component (a3) is more preferably acrylamide from the viewpoint of excellent efficiency for forming a crosslinked structure.
- the content of the component (a3) in the monomer component is 0% by mass.
- the content is preferably 5% by mass or less, more preferably 0.1% by mass or more, more preferably 0.2% by mass or more, and more preferably 4% by mass or less.
- the monomer component for obtaining the polymer as the component (A) is a monomer other than the components (a4), (a1), (a2) and (a3). Further, it may further contain 0% by mass or more and 10% by mass or less of a monomer having one olefinic double bond in the molecule (hereinafter sometimes simply referred to as “component (a4)”).
- component (a4) 100 mass%. That is, the component (A) can be a copolymer of monomer components including the component (a1), the component (a2), and the component (a3) and / or the component (a4) as necessary.
- the component (a4) examples include vinyl acetate, styrene, acrylonitrile, macromonomers having a radical polymerizable vinyl group at the monomer terminal obtained by polymerizing a vinyl group, carboxyl groups such as (meth) acrylic acid, itaconic acid, maleic acid, and the like. And the like.
- the content of the component (a4) in the monomer component is 0% by mass or more and 0.2% by mass or less in order to adjust the acid value of the component (A) to prevent corrosion of the conductive film. preferable.
- the Tg of the component (A) is ⁇ 80 ° C. or higher and 20 ° C. or lower from the viewpoint of more reliably achieving good adhesion and durability and reducing light leakage.
- the temperature is preferably ⁇ 80 ° C. or higher and 0 ° C. or lower.
- the Tg of the component (A) is a value calculated by the following formula (6) (FOX formula).
- Tg A represents the glass transition temperature (K) of the component (A)
- Tg a1 , Tg a2 , Tg a3 , and Tg a4 are the constituent monomers (a1), (a2), (a3)
- the glass transition temperature (Tg (K)) of the homopolymer prepared from (a4) is shown, and W a1 , W a2 , W a3 , and W a4 are respectively contained in the component (A), the component (a1), (The weight fraction of (a2) component, (a3) component, (a4) component is shown.)
- Tg A is calculated as an absolute temperature (K) by the above equation (6), it is converted to a Celsius temperature (° C.) as necessary.
- the glass transition temperatures of homopolymers prepared from typical monomers are shown in Table 1 below. More specifically, for example, Polymer Handbook 4th Edition (Polymer Handbook Fourth Edition, Wiley-Interscience, 1999) It is described in.
- the component (A) has a weight average molecular weight (Mw) of 50,000 or more and 750,000 or less from the viewpoint that good adhesiveness and durability can be achieved more reliably. Is preferably 100,000 or more, more preferably 150,000 or more, on the other hand, preferably 600,000 or less, more preferably 500,000 or less, and 400,000 or less. More preferably.
- the weight average molecular weight of the component (A) is obtained by using GPC (gel permeation chromatography) and calculating the weight average molecular weight (Mw) in terms of standard polystyrene under the following conditions.
- ⁇ GPC measurement conditions Measuring device: HLC-8120GPC (manufactured by Tosoh Corporation) GPC column configuration: The following five columns (all manufactured by Tosoh Corporation) (1) TSK-GEL HXL-H (guard column) (2) TSK-GEL G7000HXL (3) TSK-GEL GMHXL (4) TSK-GEL GMHXL (5) TSK-GEL G2500HXL Diluted with tetrahydrofuran so that the sample concentration is 1.0 mg / cm 3 Mobile phase solvent: Tetrahydrofuran Flow rate: 1.0 cm 3 / min Column temperature: 40 ° C.
- the crosslinking agent as the (B) component is a crosslinking agent represented by the general formula (1) or the general formula (2). ,including.
- the above general formula (1) or general formula (2) is used.
- x is more preferably an integer of 2 or more and 10 or less (more preferably an integer of 4 or more and 8 or less).
- M is more preferably an integer of 1 to 10, more preferably an integer of 1 to 6.
- y is an integer of 2 or more and 10 or less. More preferably, it is an integer of 4 to 8, more preferably n is an integer of 1 or more and 10 or less, and further preferably an integer of 1 or less and 6 or less.
- R 1A , R 1B , and R 1C may be the same, different, or a plurality of combinations.
- the component (B) is an isocyanate-based crosslinking agent, and more specifically, the component (B) is a skeleton derived from trimethylolpropane as represented by the general formula (1) or the general formula (2) ( — (O—CH 2 —) 3 —C—CH 2 CH 3 ) and an isocyanate (—N ⁇ C ⁇ O) group.
- the component (B) has, for example, a crosslinking degree (the number of isocyanate groups contained in one molecule of the component (B)) of 1 or more and 9 or less. It is preferable that the degree of crosslinking is 3 or more and 6 or less.
- the component (B) can be obtained, for example, by condensing trimethylolpropane and an acid halide (or ester or carboxylic acid) having an isocyanate group.
- the molecular weight of the component (B) is preferably 500 or more and 10,000 or less, and preferably 2,000 or more and 7,000 or less, from the viewpoint of further improving the elasticity. More preferred.
- the pressure-sensitive adhesive composition according to this embodiment includes the component (B), the group represented by the general formula (3) and / or the general formula (4) included in the component (B).
- ) A linear structure adjacent to a skeleton derived from trimethylolpropane (represented as R 1A , R 1B , R 1C in the general formula (1) and the general formula (2)).
- the component (B) reacts with a functional group such as water and hydroxyl groups to generate a gas generated from the pressure-sensitive adhesive layer (for example, carbon dioxide, water vapor, monomer, secondary agent).
- a functional group such as water and hydroxyl groups to generate a gas generated from the pressure-sensitive adhesive layer (for example, carbon dioxide, water vapor, monomer, secondary agent).
- the pressure-sensitive adhesive layer obtained from the pressure-sensitive adhesive composition according to the present embodiment can suppress gas generated from the base material and generates less gas from the pressure-sensitive adhesive layer itself. Under foaming can be suppressed.
- the content of the component (B) in the pressure-sensitive adhesive composition according to the present embodiment is 100 masses of the component (A) according to the present embodiment from the viewpoint of suppressing foaming and enhancing the adhesive strength and durability. It is preferably 0.04 parts by mass or more and 10 parts by mass or less, more preferably 0.05 parts by mass or more and 10 parts by mass or less, further preferably 0.06 parts by mass or more, and 0.07 parts by mass relative to parts. The amount is particularly preferably at least 2 parts by mass, while it is preferably at most 2 parts by mass.
- a commercially available crosslinking agent can be used as the component (B).
- component (B) A commercially available crosslinking agent can be used as component (B).
- D-94 distributed component: Soken Chemical Co., Ltd.
- E405-70B distributed component: Asahi Kasei Co., Ltd.
- MFA-75B distributed component: Asahi Kasei Co., Ltd.
- the foaming can be suppressed because of its high elasticity.
- or 3 described in the Example mentioned later can be mentioned, for example.
- the adhesive composition which concerns on this embodiment can further contain components other than (A) component and (B) component as needed.
- the pressure-sensitive adhesive composition according to the present embodiment includes (C) a silane coupling agent (hereinafter sometimes simply referred to as “component (C)”), as long as the effects of the present invention are not impaired.
- component (C) a silane coupling agent
- An ionic compound (hereinafter sometimes simply referred to as “component (D)”), an antioxidant, an ultraviolet absorber, a tackifier, a plasticizer, and the like may be blended.
- Component (C) is, for example, a polymerizable unsaturated group-containing silicon compound such as vinyltrimethoxysilane, vinyltriethoxysilane, and methacryloxypropyltrimethoxysilane; 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyl Silicon compounds having an epoxy structure such as methyldimethoxysilane and 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane; 3-aminopropyltrimethoxysilane, N- (2-aminoethyl) 3-aminopropyltrimethoxysilane And amino group-containing silicon compounds such as N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane; and 3-chloropropyltrimethoxysilane; oligomer-type silane coupling agents, etc.
- content of (C) component is 0.01 mass part or more and 0.5 mass part with respect to 100 mass parts of (A) component. It is preferable that it is 0.05 mass part or more and 0.3 mass part or less.
- the pressure-sensitive adhesive composition according to this embodiment may contain (D) an ionic compound.
- the component (D) include an ionic compound that is composed of an anion and a cation and is liquid or solid at 25 ° C., specifically, an alkali metal salt, an ionic liquid (liquid at 25 ° C. Shape), surfactants and the like.
- Content of (D) component in the adhesive composition which concerns on this embodiment can be 0.01 mass part or more and 3 mass parts or less with respect to 100 mass parts of (A) component which concerns on this embodiment, It is preferably 0.05 parts by mass or more and 2.5 parts by mass or less.
- the polymerization method of component (A) is not particularly limited and can be polymerized by known methods such as solution polymerization, emulsion polymerization, suspension polymerization, etc. In producing the pressure-sensitive adhesive composition of the present invention using a mixture of coalesces, it is preferable to perform polymerization by solution polymerization from the viewpoint that the treatment process is relatively simple and can be performed in a short time.
- solution polymerization generally, a predetermined organic solvent, each monomer, a polymerization initiator, a chain transfer agent used as necessary, and the like are charged in a polymerization tank, under a nitrogen stream or a reflux temperature of the organic solvent, The reaction is carried out by heating for several hours with stirring.
- the organic solvent include aromatic hydrocarbons such as benzene, toluene, ethylbenzene, n-propylbenzene, tert-butylbenzene, o-xylene, m-xylene, p-xylene, tetralin, decalin, aromatic naphtha;
- aromatic hydrocarbons such as benzene, toluene, ethylbenzene, n-propylbenzene, tert-butylbenzene, o-xylene, m-xylene, p-xylene, tetralin, decalin, aromatic naphtha
- aliphatic or alicyclic hydrocarbons such as n-hexane, n-heptane, n-octane, isooctane, n-decane, dipentene, petroleum spirit, petroleum naphtha, turpentine oil;
- Esters such
- organic solvents for polymerization in the polymerization of the component (A), it is preferable to use an organic solvent that hardly causes chain transfer during the polymerization reaction, for example, esters and ketones.
- an organic solvent that hardly causes chain transfer during the polymerization reaction for example, esters and ketones.
- use of ethyl acetate, methyl ethyl ketone, acetone or the like is preferable.
- organic peroxides and azo compounds that can be used in ordinary solution polymerization.
- organic peroxides include tert-butyl hydroperoxide, cumene hydroperoxide, dicumyl peroxide, benzoyl peroxide, lauroyl peroxide, caproyl peroxide, diisopropyl peroxydicarbonate, di- 2-ethylhexyl peroxydicarbonate, tert-butyl peroxybivalate, 2,2-bis (4,4-di-tert-butylperoxycyclohexyl) propane, 2,2-bis (4,4-di-tert) -Amylperoxycyclohexyl) propane, 2,2-bis (4,4-di-tert-octylperoxycyclohexyl) propane, 2,2-bis (4,4-di- ⁇ -cumylperoxycyclohexyl) propane, 2,2-bis (4,4-bis(,4-bis(,4-di-
- Examples of the azo compound include 2,2′-azobis-isobuty Examples include rhonitrile, 2,2′-azobis-2,4-dimethylvaleronitrile, 2,2′-azobis-4-methoxy-2,4-dimethylvaleronitrile, and the like.
- polymerization initiators that do not cause a graft reaction during the polymerization reaction of component (A) are preferable, and azo polymerization initiators are particularly preferable.
- the amount used is usually 0.01 parts by mass or more and 2 parts by mass or less, preferably 0.1 parts by mass or more and 1.0 parts by mass or less, with respect to 100 parts by mass of the total amount of monomers.
- the component (A) contained in the pressure-sensitive adhesive composition of the present invention it is normal not to use a chain transfer agent, but as long as it does not impair the object and effect of the present invention. It is possible to use.
- chain transfer agents examples include cyanoacetic acid; alkyl esters having 1 to 8 carbon atoms of cyanoacetic acid; bromoacetic acid; alkyl esters having 1 to 8 carbon atoms of bromoacetic acid; anthracene and phenanthrene.
- Aromatic compounds such as p-nitroaniline, nitrobenzene, dinitrobenzene, p-nitrobenzoic acid, p-nitrophenol, p-nitrotoluene; benzoquinone, 2, Benzoquinone derivatives such as 3,5,6-tetramethyl-p-benzoquinone; borane derivatives such as tributylborane; carbon tetrabromide, carbon tetrachloride, 1,1,2,2-tetrabromoethane, tribromoethylene, Trichlorethylene, bromotrichloromethane, tribromometa Halogenated hydrocarbons such as 3-chloro-1-propene; aldehydes such as chloral and furaldehyde; alkyl mercaptans having 1 to 18 carbon atoms; aromatic mercaptans such as thiophenol and toluene mercaptan; mercaptoacetic acid And alkyl esters of mercaptoacetic acid having
- the polymerization temperature of the component (A) is generally about 30 ° C. or higher and 180 ° C. or lower, preferably 40 ° C. or higher and 150 ° C. or lower, more preferably 50 ° C. or higher and 90 ° C. or lower.
- an unreacted monomer is contained in a polymer obtained by a solution polymerization method or the like, it can be purified by a reprecipitation method using methanol or the like in order to remove the monomer.
- the adhesive composition which concerns on this embodiment is normally prepared by mixing the said (A) component and (B) component and arbitrary components as needed simultaneously or in arbitrary orders. .
- (B) component is added to the solution containing (A) component after the completion of polymerization.
- the component (A) is prepared by bulk polymerization, uniform mixing becomes difficult after the completion of the polymerization. Therefore, it is preferable to add and mix the component (B) during the polymerization.
- the pressure-sensitive adhesive composition according to this embodiment can be suitably used as an adhesive for touch panels. According to the pressure-sensitive adhesive composition according to the present embodiment, when it exhibits excellent durability under wet heat conditions and is used for adhesion to an adherend that is a base material (for example, glass or resin), Foaming in the pressure-sensitive adhesive layer can be suppressed under wet heat conditions.
- the first cause is a gas generated in the base material bonded to the pressure-sensitive adhesive layer.
- the second cause is a gas caused by components constituting the pressure-sensitive adhesive layer.
- the gas from the base material which is the first cause, is a gas generated from an organic material (resin) such as polycarbonate, polymethyl methacrylate, or polyimide.
- organic material such as polycarbonate, polymethyl methacrylate, or polyimide.
- polycarbonate is known to generate outgas (CO 2 ) under high temperature conditions as a material property. Further, polycarbonate easily allows water vapor (H 2 O) to pass through, and the permeation of water vapor is particularly remarkable under high temperature conditions. These gases may cause foaming in the pressure-sensitive adhesive layer bonded to the polycarbonate. In the case of polymethyl methacrylate, water vapor and unreacted monomers may be generated as gas.
- the gas resulting from the components constituting the pressure-sensitive adhesive layer, which is the second cause, is a gas generated by the reaction of the components contained in the pressure-sensitive adhesive composition.
- a gas generated by the reaction of the components contained in the pressure-sensitive adhesive composition For example, in an isocyanate-based crosslinking agent, an isocyanate group and water may react to generate carbon dioxide.
- the anti-foaming characteristic which is one effect of the adhesive composition which concerns on this embodiment is based on the following mechanism of action.
- the pressure-sensitive adhesive composition according to the present embodiment when used to provide a pressure-sensitive adhesive layer on the surface of the base material, the pressure-sensitive adhesive composition has the component (B), whereby the above-mentioned general components contained in the component (B) As a result of increased elasticity due to the group represented by the formula (1) and / or the group represented by the general formula (2), gas generated from the substrate can be suppressed. Moreover, in the adhesive composition which concerns on this embodiment, there are few gas produced by reaction with (B) component.
- the adhesive layer for bonding the member which comprises a touch panel using the adhesive composition which concerns on this embodiment is formed, foaming of this adhesive layer can be suppressed, and this adhesive Since the layer is excellent in adhesive strength and durability (wet heat durability), when the members constituting the touch panel are bonded together using the pressure-sensitive adhesive layer, peeling hardly occurs. Furthermore, since the pressure-sensitive adhesive composition according to this embodiment does not contain an acid component, the conductive film is non-corrosive.
- Adhesive sheet which concerns on another one Embodiment of this invention has an adhesive layer containing the adhesive composition for touchscreens which concerns on the said embodiment on the single side
- the pressure-sensitive adhesive layer is coated on the pressure-sensitive adhesive sheet by applying the pressure-sensitive adhesive composition on a support with a gravure coater, Mayer bar coater, air knife coater, roll coater, or the like.
- the applied pressure-sensitive adhesive composition may be formed by drying and crosslinking by room temperature or heating, or may be formed by providing a pressure-sensitive adhesive layer on a release film and transferring it to an adherend.
- the thickness of the pressure-sensitive adhesive sheet is usually about 10 ⁇ m or more and 1000 ⁇ m or less, preferably about 25 ⁇ m or more and 500 ⁇ m or less.
- the support is, for example, an organic polymer such as polycarbonate, polymethyl methacrylate, polyethylene terephthalate (PET) or the like, triacetyl cellulose (TAC), polysulfone, polyimide, polystyrene, polytetrafluoroethylene, polyethylene, or polyvinyl chloride. , And glass.
- organic polymer such as polycarbonate, polymethyl methacrylate, polyethylene terephthalate (PET) or the like, triacetyl cellulose (TAC), polysulfone, polyimide, polystyrene, polytetrafluoroethylene, polyethylene, or polyvinyl chloride.
- TAC triacetyl cellulose
- the adherend is a glass with a conductive film layer or a resin film with a conductive film, polycarbonate, polyester such as polymethyl methacrylate, polyethylene terephthalate (PET), triacetyl cellulose (TAC), polysulfone, polyimide, polystyrene, polytetrafluoroethylene. , Organic polymers such as polyethylene and polyvinyl chloride, and glass.
- the thickness of the support or adherend is not particularly limited, but in the case of an organic polymer, for example, it is preferably 12 ⁇ m or more and 75 ⁇ m or less.
- the said base material may have any form of a single layer and a multilayer.
- the substrate surface may be subjected to known and conventional surface treatments such as physical treatment such as corona discharge treatment and plasma treatment, and chemical treatment such as undercoating treatment. In the case of glass, it is preferably 25 ⁇ m or more and 2000 ⁇ m or less.
- Laminated body The laminated body 100 which concerns on one Embodiment of this invention contains the 1st base material 20, the 2nd base material 30, and the adhesive layer 10, as FIG. 1 shows, 1st The base material 20 and the second base material 30 are bonded to each other via the pressure-sensitive adhesive layer 10.
- the laminated body which concerns on this embodiment is the process of bonding a 1st base material and a 2nd base material through the adhesive layer obtained from the adhesive composition for touchscreens as described in the said embodiment.
- the first adhesive 20 (adhesive layer 10) obtained from the adhesive composition for a touch panel according to the above embodiment is attached to the first substrate 20 or the second substrate 30, so that the first Between the base material 20 and the second base material 30. That is, after the surface of the pressure-sensitive adhesive layer 10 is attached to the surface of either the first base material 20 or the second base material 30, the other surface (back surface) of the pressure-sensitive adhesive layer 10 is set to the second surface.
- the first base material 20 and the second base material 30 can be bonded together by the pressure-sensitive adhesive layer 10 by being attached to the other surface of the base material 30 or the first base material 20.
- the first base material 10 and the second base material 20 can each contain glass or resin.
- the first substrate 10 may include glass
- the second substrate 20 may include a resin.
- Examples of the resin constituting the first base material 10 and / or the second base material 20 include the organic polymers exemplified above as the support. Due to the addition of heat, these resins may generate water contained in the resin, gas generated by decomposition of the resin, and gas derived from monomers and by-products that are raw materials of the resin. .
- the pressure-sensitive adhesive layer 10 is obtained from the pressure-sensitive adhesive composition according to this embodiment, and has high elasticity, and therefore suppresses gas generated from the first base material 20 and / or the second base material 30. it can.
- the laminated body 100 which concerns on this embodiment originates in the elasticity of the adhesive layer 10 because the 1st base material 20 and the 2nd base material 30 are bonded together through the adhesive layer 10.
- FIG. In addition to the fact that the pressure-sensitive adhesive layer 10 can suppress the gas generated from the first base material 20 and / or the second base material 30, there is little gas generated from the pressure-sensitive adhesive layer 10 itself. For this reason, foaming in the pressure-sensitive adhesive layer 10 is suppressed. Therefore, since the first base material 20 and the second base material 30 are bonded to each other by the pressure-sensitive adhesive layer 10 that is excellent in transparency and adhesive strength, Peeling is unlikely to occur.
- component (A) (acrylic polymers A to E).
- the acid values of acrylic polymers A and C to F were all 0 mg / KOH.
- the acid value of the acrylic polymer G was 4 mg / KOH.
- a pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer having a thickness of 50 ⁇ m was obtained by applying the solution of the pressure-sensitive adhesive composition onto the surface of the release-treated polyester film and drying it.
- This pressure-sensitive adhesive sheet was aged in a dark place at 23 ° C./50% RH for 7 days, and then attached to one side of a 100 ⁇ m-thick polyethylene terephthalate film to obtain a pressure-sensitive adhesive sheet for evaluation.
- crosslinking agents 1 to 3 were used as the component (B).
- Each of the crosslinking agents 1 to 5 has a structure represented by the following structural formulas (7) to (11).
- the weight average molecular weight (MW) of the crosslinking agent 1 is about 4,000
- the weight average molecular weight (MW) of the crosslinking agent 2 is about 3,700, for example
- the weight average molecular weight (MW) of the crosslinking agent 3 is For example, about 4,000.
- Crosslinking agent 1 [Crosslinking agent 1] (7) (In the formula, l is 1 or more and 10 or less, m is 1 or more and 10 or less, and n is 1 or more and 10 or less.)
- Crosslinking agent 3 (9) (In the formula, l is 1 or more and 10 or less, m is 1 or more and 10 or less, and n is 1 or more and 10 or less.)
- the adhesive sheet for evaluation obtained in 4.2 above is cut into 50 mm ⁇ 60 mm, the release sheet on one side is peeled off, and is attached to each adherend described in Table 3, with a roller weighing 2 kg. Three reciprocating pressures were applied. After pressure bonding, autoclaving was performed at 50 ° C. ⁇ 5 atm for 20 minutes. Next, after standing at room temperature for 1 hour, after standing in an environment of 85 ° C./85% RH for 24 hours and standing at 23 ° C./50% RH for 1 hour, the presence or absence of foaming of the adhesive layer was visually confirmed. .
- the criteria for evaluation are as follows.
- each of the pressure-sensitive adhesive compositions of Examples 1 to 9 and Comparative Examples 1 to 7 was placed on a polyethylene terephthalate film (hereinafter referred to as separator) having a thickness of 38 ⁇ m. And coated at 90 ° C. for 3 minutes to form a coating film having a dry film thickness of 50 ⁇ m. A separator was further bonded to the surface of the coating film opposite to the surface of the polyethylene terephthalate film, and an adhesive sheet for evaluation having a 50 ⁇ m thick adhesive layer sandwiched between two separators was obtained.
- separator polyethylene terephthalate film
- the separator on one side of the pressure-sensitive adhesive sheet for evaluation obtained by the method described in this column is peeled off and bonded to a 1.0 mm-thick slide glass, and the separator on the other side of the pressure-sensitive adhesive sheet is peeled off.
- the haze of only the pressure-sensitive adhesive layer was measured using a haze meter HM-150 (Murakami Color Research Laboratory).
- AA acrylic acid AM: acrylamide
- BA n-butyl acrylate
- 2EHA 2-ethylhexyl acrylate
- 2EHMA 2-ethylhexyl methacrylate
- MA methyl acrylate
- HEA 2-hydroxyethyl acrylate
- HEMA 2-hydroxyethyl methacrylate
- ISTA isostearyl acrylate
- compositions of Examples 1 to 9 are represented by the crosslinking agent 1 or 2 represented by the general formula (1) as the component (B) or the general formula (2). It can be understood that the inclusion of the cross-linking agent 3 can suppress foaming under wet heat conditions, and can realize high adhesive strength and excellent durability and transparency.
- the compositions of Comparative Examples 1 to 6 include both the crosslinking agent represented by the general formula (1) and the crosslinking agent represented by the general formula (2) as the component (B). (That is, the crosslinking agent 4 and the crosslinking agent 5 used in Comparative Examples 1 to 6 do not have the structure represented by the general formula (1) or the general formula (2)). It can be understood that it could not be reduced.
- the comparative example 2 is an example which affixed the adhesive sheet for evaluation to the base material (polycarbonate), it can be understood that the adhesive layer using the adhesive composition containing the crosslinking agent 4 has low adhesive force. .
- the composition of the comparative example 7 contains the polymer G which has an acidic group, it can be understood that it is inferior to electrically conductive film non-corrosiveness.
- Example 1 to 9 in addition to the components (A) and (B), 1 part by mass of the component (C) and 0.1 part by mass of the component (D) were further blended to obtain a pressure-sensitive adhesive composition.
- the pressure-sensitive adhesive sheet was prepared using the pressure-sensitive adhesive composition, the pressure-sensitive adhesive sheet thus obtained was suppressed from foaming under wet heat conditions, and had high adhesive strength and excellent performance. Durability and transparency.
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Abstract
Description
(式中、R1A,R1B,R1Cは独立して、下記一般式(3)で表される基および/または下記一般式(4)で表される基を含む基であり、R2A,R2B,R2Cは、-(CH2)6-で表される基である。)
(式中、R1A,R1B,R1Cは独立して、下記一般式(3)で表される基および/または下記一般式(4)で表される基を含む基であり、R2A,R2B,R2C,R3A,R3B,R3C,R3D,R3E,R3Fは、-(CH2)6-で表される基である。)
本発明の一実施形態に係るタッチパネル用粘着剤組成物(以下、単に「粘着剤組成物」と記載する場合もある。)は、重量平均分子量が10万以上80万未満であり、酸性基を実質的に含有しないアクリル系ポリマー(A)(以下、単に「(A)成分」と記載する場合もある。)と、下記一般式(1)または下記一般式(2)で表される架橋剤(B)(以下、単に「(B)成分」と記載する場合もある。)と、を含む。
(式中、R1A,R1B,R1Cは独立して、下記一般式(3)で表される基および/または下記一般式(4)で表される基を含む基であり、R2A,R2B,R2Cは、-(CH2)6-で表される基である。)
(式中、R1A,R1B,R1Cは独立して、下記一般式(3)で表される基および/または下記一般式(4)で表される基を含む基であり、R2A,R2B,R2C,R3A,R3B,R3C,R3D,R3E,R3Fは、-(CH2)6-で表される基である。)
(A)成分は、(a1)(メタ)アクリル酸アルキルエステル(以下、単に「(a1)成分」と記載する場合もある。)および(a2)水酸基含有単量体(以下、単に「(a2)成分」と記載する場合もある。)を含む単量体成分の共重合体である。(a1)成分および(a2)成分は、酸性基を有さないことが好ましい。
(a1)成分は、本実施形態に係る粘着剤組成物の粘着力に寄与することができる。(a1)成分は、例えば、下記の式(5)で表されることができる。
(a2)成分は、(B)成分と反応して架橋構造の形成に寄与することができる。より具体的には、(a2)成分に含まれる水酸基が(B)成分中のイソシアネート基と反応することにより、架橋構造を形成することができる。
前記単量体成分は、(a1)成分および(a2)成分以外の単量体であって、分子内に1個のオレフィン性二重結合を有する単量体として、(a3)窒素含有単量体(以下、単に「(a3)成分」と記載する場合もある。)0質量%以上7質量%以下をさらに含むことができる。
また、(A)成分である重合体を得るための前記単量体成分は、(a4)(a1)成分、(a2)成分および(a3)成分以外の単量体であって、分子内に1個のオレフィン性二重結合を有する単量体(以下、単に「(a4)成分」と記載する場合もある。)0質量%以上10質量%以下をさらに含むことができる。なお、本明細書において、(a1)成分+(a2)成分+(a3)成分+(a4)成分=100質量%である。すなわち、(A)成分は、(a1)成分、(a2)成分、必要に応じて(a3)成分および/または(a4)成分を含む単量体成分の共重合体であることができる。
本実施形態に係る粘着剤組成物では、良好な接着性および耐久性ならびに光漏れの低減をより確実に達成できる観点から、(A)成分のTgは-80℃以上20℃以下であることが好ましく、-80℃以上0℃以下であることがより好ましい。なお、本発明において、(A)成分のTgは、下記式(6)(FOXの式)により算出された値である。
(式中、TgAは、(A)成分のガラス転移温度(K)を示し、Tga1,Tga2,Tga3,Tga4はそれぞれ、構成モノマー(a1),(a2),(a3),(a4)から調製されたホモポリマーのガラス転移温度(Tg(K))を示し、Wa1,Wa2,Wa3,Wa4はそれぞれ、(A)成分中に含まれる、(a1)成分,(a2)成分,(a3)成分,(a4)成分の重量分率を示す。)
また、本実施形態に係る粘着剤組成物において、良好な接着性および耐久性をより確実に達成できる観点から、(A)成分は、重量平均分子量(Mw)が5万以上75万以下であることが好ましく、10万以上であることがより好ましく、15万以上であることがさらに好ましく、一方、60万以下であることが好ましく、50万以下であることがより好ましく、40万以下であることがさらに好ましい。ここで、(A)成分の重量平均分子量は、GPC(ゲルパーミエーションクロマトグラフィー)を用い、下記の条件で標準ポリスチレン換算による重量平均分子量(Mw)を求めたものである。
測定装置:HLC-8120GPC(東ソー社製)
GPCカラム構成:以下の5連カラム(すべて東ソー社製)
(1)TSK-GEL HXL-H(ガードカラム)
(2)TSK-GEL G7000HXL
(3)TSK-GEL GMHXL
(4)TSK-GEL GMHXL
(5)TSK-GEL G2500HXL
サンプル濃度:1.0mg/cm3となるように、テトラヒドロフランで希釈
移動相溶媒:テトラヒドロフラン
流量:1.0cm3/分
カラム温度:40℃
上述したように、本実施形態に係る粘着剤組成物において、(B)成分である架橋剤は、上記一般式(1)または上記一般式(2)で表される架橋剤と、を含む。
1.3.1.(C)シランカップリング剤
本実施形態に係る粘着剤組成物は、必要に応じて、(A)成分および(B)成分以外の成分をさらに含むことができる。例えば、本実施形態に係る粘着剤組成物には、本発明の効果を損なわない範囲で、(C)シランカップリング剤(以下、単に「(C)成分」と記載することもある。)、(D)イオン性化合物(以下、単に「(D)成分」と記載する場合もある。)、酸化防止剤、紫外線吸収剤、粘着付与剤、可塑剤等が配合されていても良い。
また、本実施形態に係る粘着剤組成物は、(D)イオン性化合物を含んでいてもよい。(D)成分としては、例えば、アニオンとカチオンとからなる、25℃で液体状、または固体状のイオン性化合物が挙げられ、具体的には、アルカリ金属塩、イオン性液体(25℃で液体状)、界面活性剤等が挙げられる。
(A)成分の重合方法は、特に制限されるものではなく、溶液重合、乳化重合、懸濁重合などの公知の方法により重合できるが、重合により得られた共重合体の混合物を用いて、本発明の粘着剤組成物を製造するにあたり、処理工程が比較的簡単でかつ短時間で行える観点から、溶液重合により重合することが好ましい。
本実施形態に係る粘着剤組成物は、通常、前記(A)成分および(B)成分および必要に応じて任意成分を、同時にあるいは任意の順番で混合して調製される。また、(A)成分と(B)成分とを混合するにあたり、(A)成分を溶液重合により調製した場合は、重合完了後の(A)成分を含む溶液に(B)成分を添加してもよく、(A)成分を塊状重合により調製する場合は、重合完了後では均一混合が困難になるため、この重合の途中で(B)成分を添加して混合することが好ましい。
本実施形態に係る粘着剤組成物は、タッチパネル用の接着剤として好適に用いることができる。本実施形態に係る粘着剤組成物によれば、湿熱条件下で優れた耐久性を発揮し、かつ、基材(例えば、ガラスまたは樹脂)である被着体との接着に使用される場合、湿熱条件下において、該粘着剤層における発泡を抑えることができる。
本発明の別の一実施形態に係る粘着シート(粘着剤層)は、上記実施形態に係るタッチパネル用粘着剤組成物を含む粘着剤層を支持体の片面または両面に有する。
本発明の一実施形態に係る積層体100は、図1に示されるように、第1の基材20と、第2の基材30と、粘着剤層10と、を含み、第1の基材20と第2の基材30とが、粘着剤層10を介して貼り合されている。
以下、本発明を下記実施例に基づいて説明するが、本発明は実施例に限定されない。
4.1.1.ポリマーA、C~Gの調製
攪拌機、還流冷却器、温度計および窒素導入管を備えた反応装置に、下記表2に示す配合比率を有する単量体成分を仕込み、次に、酢酸エチルをモノマー濃度が50質量%になる配合量にて仕込んだ。次に、アゾビスイソブチロニトリル0.1質量部を加え、反応容器内の空気を窒素ガスで置換しながら撹拌を行い60℃に昇温した後、6時間反応させた。反応終了後、酢酸エチル(溶媒)で希釈して、(A)成分(アクリル系ポリマーA~E)の溶液を得た。なお、アクリル系ポリマーA、C~Fの酸価はいずれも0mg/KOHであった。アクリル系ポリマーGの酸価は4mg/KOHであった。
攪拌機、還流冷却器、温度計および窒素導入管を備えた反応装置に、下記表2に示す配合比率を有する単量体成分を仕込み、次に、酢酸エチルをモノマー濃度が40質量%になる配合量にて仕込んだ。次に、アゾビスイソブチロニトリル0.1質量部を加え、反応容器内の空気を窒素ガスで置換しながら撹拌を行い60℃に昇温した後、6時間反応させた。反応終了後、酢酸エチル(溶媒)で希釈して、(A)成分(アクリル系ポリマーB)の溶液を得た。なお、アクリル系ポリマーBの酸価は0mg/KOHであった。
上記4.1.で得られた(A)成分を用いて、下記表3の配合(表3では、各成分の配合量は、溶媒を除いた固形分中の割合を示す。)にて各成分を添加して、実施例1ないし9および比較例1ないし7の粘着剤組成物の溶液を得た。
4.3.1.180°剥離力(粘着力)
上記4.2で得られた評価用粘着シートを25mm×150mmに裁断して、片面の剥離シートを剥がし、これを表3に記載の各被着体に貼り付け、重さ2kgのローラーで3往復圧着させた。圧着後23℃×50%RH雰囲気下で20分間放置した後、試験片の短辺を引き剥がし速度300mm/分で180°方向に引っ張り、10回の測定値の平均値を剥離力とした。
上記4.2で得られた評価用粘着シートを50mm×60mmに裁断して、片側の剥離シートを剥がし、表3に記載の各被着体に貼り付け、重さ2kgのローラーで3往復圧着させた。圧着後、50℃×5atmで20分間オートクレーブ処理を行った。次いで、1時間室温で静置した後、85℃/85%RH環境下に24時間置き、23℃/50%RHで1時間静置した後、粘着剤層の発泡の有無を目視で確認した。評価の基準は以下の通りである。
○:目視では粘着剤層に気泡は確認できない。
×:目視にて大きな気泡が確認される。または、粘着剤層が支持体または被着体から浮いている。
10mm×100mmに裁断したITO蒸着PETフィルムに、上記4.2で得られた評価用粘着シートを10mm×60mmに裁断し、片側の剥離シートを剥がして貼り付け、50℃×5atmで20分間オートクレーブ処理を行った。次いで、1時間室温で静置した後、60℃でかつ90%RHの環境下に500時間置き、23℃でかつ湿度65%RHの条件下に1時間静置した後、ITO蒸着フィルムの抵抗値を測定し、あらかじめ測定しておいた試験前の抵抗値と比較し、試験前の抵抗値に対する抵抗値の変化率を求めた。なお、抵抗値の測定には、テスター(三和電気計器(株)製、デジタルマルチメーターPC510)を用いた。
○:試験前の抵抗値に対する抵抗値の変化率が115%未満
×:試験前の抵抗値に対する抵抗値の変化率が115%以上
脱泡処理の後、厚さ38μmの剥離処理されたポリエチレンテレフタレートフィルム(以下:セパレータ)上に、実施例1ないし9および比較例1ないし7の粘着剤組成物をそれぞれ、ドクターブレードを用いて塗布し、90℃で3分間乾燥して、乾燥膜厚50μmの塗膜を形成した。塗膜の前記ポリエチレンテレフタレートフィルムの貼付面とは反対の面に、セパレータをさらに貼り合わせ、2枚のセパレータに挟まれた厚さ50μmの粘着剤層を有する評価用粘着シートを得た。次に、本欄に記載の方法により得られた前記評価用粘着シートの片面のセパレータを剥離し、1.0mm厚のスライドガラスへ貼り合わせ、粘着シートのもう一方の面のセパレータを剥離して、ヘイズメーターHM-150(村上色彩技研研究所)を用いて、粘着剤層のみのヘイズを測定した。
AA:アクリル酸
AM:アクリルアミド
BA:n-ブチルアクリレート
2EHA:2-エチルヘキシルアクリレート
2EHMA:2-エチルヘキシルメタクリレート
MA:メチルアクリレート
HEA:2-ヒドロキシエチルアクリレート
HEMA:2-ヒドロキシエチルメタクリレート
ISTA:イソステアリルアクリレート
10 粘着剤層
20 第1の基材
30 第2の基材。
Claims (5)
- (A)重量平均分子量が10万以上80万未満であり、酸性基を実質的に含有しないアクリル系ポリマーと、
(B)下記一般式(1)または下記一般式(2)で表される架橋剤と、を含み、
前記(A)アクリル系ポリマーは、(a1)(メタ)アクリル酸アルキルエステルおよび(a2)水酸基含有単量体を含む単量体成分の共重合体であり、
前記(A)アクリル系ポリマー100質量部に対して前記(B)架橋剤を0.04質量部以上10質量部以下含む、タッチパネル用粘着剤組成物。
(式中、R1A,R1B,R1Cは独立して、下記一般式(3)で表される基および/または下記一般式(4)で表される基を含む基であり、R2A,R2B,R2Cは、-(CH2)6-で表される基である。)
(式中、R1A,R1B,R1Cは独立して、下記一般式(3)で表される基および/または下記一般式(4)で表される基を含む基であり、R2A,R2B,R2C,R3A,R3B,R3C,R3D,R3E,R3Fは、-(CH2)6-で表される基である。)
(式中、xは2以上10以下の整数であり、mは1以上10以下の整数である。)
(式中、Xは単結合または-O-を表し、yは2以上10以下の整数であり、nは1以上10以下の整数である。) - 前記単量体成分は、前記(a1)(メタ)アクリル酸アルキルエステル45質量%以上99質量%以下と、前記(a2)水酸基含有単量体1質量%以上40質量%以下と、(a1)成分および(a2)成分以外の単量体であって、分子内に1個のオレフィン性二重結合を有する単量体0質量%以上15質量%以下と、を含む、請求項1に記載のタッチパネル用粘着剤組成物。
- 前記単量体成分はさらに、前記(a1)成分および(a2)成分以外の単量体であって、分子内に1個のオレフィン性二重結合を有する単量体として、
(a3)窒素含有単量体0.1質量%以上7質量%以下と、
(a4)(a1)成分、(a2)成分および(a3)成分以外の単量体であって、分子内に1個のオレフィン性二重結合を有する単量体0質量%以上10質量%以下と、を含む(ここで、(a1)成分+(a2)成分+(a3)成分+(a4)成分=100質量%である。)、請求項2に記載のタッチパネル用粘着剤組成物。 - 請求項1ないし3のいずれか1項に記載のタッチパネル用粘着剤組成物を支持体の片面または両面に有する、粘着シート。
- 第1の基材と、
第2の基材と、
請求項1ないし3のいずれか1項に記載のタッチパネル用粘着剤組成物から得られる粘着剤層と、を含み、
前記第1の基材と前記第2の基材とが、前記粘着剤層を介して貼り合されており、
前記第1の基材および第2の基材はそれぞれ、ガラスまたは樹脂を含む、積層体。
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