WO2022255132A1 - Layered body and display device - Google Patents
Layered body and display device Download PDFInfo
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- WO2022255132A1 WO2022255132A1 PCT/JP2022/020998 JP2022020998W WO2022255132A1 WO 2022255132 A1 WO2022255132 A1 WO 2022255132A1 JP 2022020998 W JP2022020998 W JP 2022020998W WO 2022255132 A1 WO2022255132 A1 WO 2022255132A1
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- WIPO (PCT)
- Prior art keywords
- layer
- meth
- pressure
- adhesive layer
- sensitive adhesive
- Prior art date
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- 125000004079 stearyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
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Images
Classifications
-
- 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
-
- 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
- B32B7/02—Physical, chemical or physicochemical properties
- B32B7/023—Optical 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
- 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
- C09J201/00—Adhesives based on unspecified macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
- C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C09J7/385—Acrylic polymers
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
-
- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/42—Polarizing, birefringent, filtering
-
- 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
Definitions
- the present invention relates to a laminate and a display device including the same.
- Patent Documents 1 to 3 In a flexible display having a bendable display panel, it is known to adjust the stress relaxation properties of the adhesive layer contained in the laminate used for the display panel in order to achieve good bendability (for example, Patent Documents 1 to 3).
- the present invention provides a laminate and a display device including the laminate that can suppress the occurrence of air bubbles or adhesive removal in the adhesive layer even when repeatedly bent under high temperature conditions so that the back layer side is inside. for the purpose of providing
- the present invention provides the following laminate and display device. [1] having a front layer, a first adhesive layer, a polarizing plate including at least a linear polarizing layer, a second adhesive layer, and a back layer in this order, When tan ⁇ at a temperature of 60 ° C. of the first pressure-sensitive adhesive layer is D1 and tan ⁇ at a temperature of 60 ° C. of the second pressure-sensitive adhesive layer is D2, the relationship of the following formulas (1) and (2) is satisfied. body. D1 ⁇ D2 (1) 0.2 ⁇ D2 ⁇ 1.0 (2) [2] The laminate according to [1], wherein the second pressure-sensitive adhesive layer has a thickness of 15 ⁇ m or more and 50 ⁇ m or less.
- the second pressure-sensitive adhesive layer is formed from a pressure-sensitive adhesive composition containing a (meth)acrylic polymer, The laminate according to any one of [1] to [4], wherein the (meth)acrylic polymer contains a structural unit derived from a (meth)acrylic acid alkyl ester having an alkyl group having 1 to 24 carbon atoms. body.
- ADVANTAGE OF THE INVENTION it is possible to provide a laminate that can suppress the occurrence of air bubbles or pressure-sensitive adhesive removal in the pressure-sensitive adhesive layer even when repeatedly bent so that the back layer side faces inward under high-temperature conditions. .
- FIG. 4 is a schematic cross-sectional view schematically showing a layered product according to another embodiment of the present invention.
- (a) and (b) are schematic diagrams for explaining a bending test method.
- Laminate 1 and 2 are schematic cross-sectional views schematically showing an example of the laminate of the present embodiment.
- Laminates 1 and 2 have a front layer 11, a first adhesive layer 21, a polarizing plate 30, a second adhesive layer 22, and a back layer 15 in this order.
- the front layer 11 is a layer provided on the viewing side of the polarizing plate 30
- the back layer 15 is a layer provided on the side opposite to the viewing side of the polarizing plate 30 .
- the first pressure-sensitive adhesive layer 21 is preferably in direct contact with the front layer 11 and the polarizing plate 30 .
- the second adhesive layer 22 is preferably in direct contact with the polarizing plate 30 and the back layer 15 .
- the polarizing plate 30 includes at least a linear polarizing layer 31, and may be a linear polarizing plate or a circular polarizing plate as described later.
- the laminates 1 and 2 can be applied to a display device (flexible display) that can be bent or wound, as described later.
- Laminated bodies 1 and 2 are particularly excellent in flexibility when bent so that the back layer 15 side faces inward.
- D1 and D2 of the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer at a temperature of 60°C are G'1 and G'2, respectively, the storage elastic moduli of the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer at a temperature of 60°C.
- the loss elastic moduli of the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer at a temperature of 60° C. are G′′1 and G′′2, respectively, the values are represented by the following equations.
- D1 G"1/G'1
- D2 G"2/G'2
- the above G'1, G'2, G''1, and G''2 can be measured by the method described in Examples below, and D1 and D2 can be obtained from these measured values.
- the D2 may be 0.25 or more, 0.30 or more, 0.35 or more, 0.90 or less, or 0.80 or less. , 0.60 or less, or 0.50 or less.
- D2 of the second pressure-sensitive adhesive layer 22 is the type and amount of the polymer contained in the pressure-sensitive adhesive composition forming the second pressure-sensitive adhesive layer 22, the weight average molecular weight of the polymer, and the type of monomer used to form the polymer. and amount, and the type and amount of the polymerization initiator and additive contained in the pressure-sensitive adhesive composition.
- D1 may be 0.10 or more, 0.20 or more, 0.23 or more, 0.30 or more, or 0.35 or more. may be less than 1.00, may be 0.80 or less, or may be 0.60 or less.
- D1 of the first pressure-sensitive adhesive layer 21 is the type and amount of the polymer contained in the pressure-sensitive adhesive composition forming the first pressure-sensitive adhesive layer 21, the weight average molecular weight of the polymer, and the type of monomer used to form the polymer. and amount, and the type and amount of the polymerization initiator and additive contained in the pressure-sensitive adhesive composition.
- the first adhesive layer 21 and the second adhesive layer 22 exhibit excellent stress relaxation under high temperature conditions. can do.
- the bending radius of the second adhesive layer 22 is smaller than the bending radius of the first adhesive layer 21, so the second adhesive layer 22 is considered to require greater stress relaxation than the first pressure-sensitive adhesive layer 21 . Therefore, when the laminates 1 and 2 are bent so that the back layer 15 side faces inward under high temperature conditions, air bubbles or adhesive leakage (adhesive It is possible to obtain the laminates 1 and 2 having excellent high-temperature flexibility that can suppress the occurrence of agent loss.
- the thickness of the second adhesive layer 22 may be 5 ⁇ m or more, 10 ⁇ m or more, 15 ⁇ m or more, 80 ⁇ m or less, or 50 ⁇ m or less. It may be 40 ⁇ m or less.
- the thickness of the second adhesive layer 22 is preferably 15 ⁇ m or more and 50 ⁇ m or less.
- the thickness of the first adhesive layer 21 may be 10 ⁇ m or more, 20 ⁇ m or more, 25 ⁇ m or more, 50 ⁇ m or less, or 40 ⁇ m or less. It may be 30 ⁇ m or less.
- the thickness of the first pressure-sensitive adhesive layer 21 is not limited to this range, and may be, for example, more than 50 ⁇ m or 80 ⁇ m or less.
- the thickness of the first adhesive layer 21 is preferably the same as the thickness of the second adhesive layer 22 or smaller than the thickness of the second adhesive layer 22 .
- the thickness of the second pressure-sensitive adhesive layer 22 satisfies the above range, it becomes easier to obtain the laminates 1 and 2 that are excellent in high-temperature flexibility, normal-temperature flexibility, and high-temperature durability.
- Excellent room temperature bendability means that when the back layer 15 side is bent to the inside under room temperature conditions, air bubbles or adhesive removal occurs in the first adhesive layer 21 and/or the second adhesive layer 22. It means that it is excellent in being able to suppress what is done.
- excellent in high-temperature durability means that the laminated bodies 1 and 2 are excellent in being able to suppress appearance defects such as floating, peeling, and foaming under high-temperature conditions.
- the thickness of the laminates 1 and 2 is preferably 100 ⁇ m or more, may be 150 ⁇ m or more, may be 2000 ⁇ m or less, may be 1000 ⁇ m or less, or may be 500 ⁇ m or less. , is preferably 250 ⁇ m or less, and may be 200 ⁇ m or less.
- the first pressure-sensitive adhesive layer 21 and the second pressure-sensitive adhesive layer 22 are preferably formed from a pressure-sensitive adhesive composition containing a (meth)acrylic polymer.
- the composition of the pressure-sensitive adhesive composition forming the first pressure-sensitive adhesive layer 21 and the composition of the pressure-sensitive adhesive composition forming the second pressure-sensitive adhesive layer 22 are usually different.
- (meth)acrylic polymer represents at least one selected from the group consisting of acrylic polymers and methacrylic polymers. The same applies to other terms with "(meta)" attached.
- the glass transition temperature of the first adhesive layer 21 and the glass transition temperature of the second adhesive layer 22 may each independently be ⁇ 40° C. or less, ⁇ 50° C. or less, or ⁇ 55. ° C. or lower, may be -60 ° C. or lower, and is usually -80 ° C. or higher.
- the first pressure-sensitive adhesive layer 21 and/or the second pressure-sensitive adhesive layer 22 have a glass transition temperature within the above range, the laminates 1 and 2 having excellent high-temperature flexibility, room-temperature flexibility, and high-temperature durability can be obtained. easy to obtain.
- the glass transition temperature of the first adhesive layer 21 and the glass transition temperature of the second adhesive layer 22 may be the same or different.
- the glass transition temperatures of the first pressure-sensitive adhesive layer 21 and the second pressure-sensitive adhesive layer 22 are adjusted by, for example, the type and amount of the polymer contained in the pressure-sensitive adhesive composition, the type and amount of the monomer used to form the polymer, and the like. can do.
- the glass transition temperature can be measured by the method described in Examples below.
- the gel fraction of the first adhesive layer 21 and the gel fraction of the second adhesive layer 22 may each independently be 40% or more, preferably 45% or more, and 50% or more. may be 60% or more, may be 90% or less, preferably 85% or less, may be 80% or less, or may be 75% or less good.
- the gel fraction of the first adhesive layer 21 and the gel fraction of the second adhesive layer 22 may be the same or different.
- the gel fraction of the first pressure-sensitive adhesive layer 21 and the second pressure-sensitive adhesive layer 22 is, for example, the amount of structural units derived from a monomer having a reactive functional group described later in the (meth)acrylic polymer described above, the pressure-sensitive adhesive It can be adjusted by the amount of the cross-linking agent contained in the composition.
- the gel fraction can be measured by the method described in Examples below.
- the (meth)acrylic polymer contained in the pressure-sensitive adhesive composition preferably contains a structural unit derived from a (meth)acrylic acid alkyl ester (monomer) having an alkyl group having 1 to 24 carbon atoms.
- the (meth)acrylic polymer more preferably contains structural units derived from a (meth)acrylic acid alkyl ester having an alkyl group having 20 or more and 24 or less carbon atoms.
- Alkyl groups may be linear or branched.
- first pressure-sensitive adhesive layer 21 and / or the second pressure-sensitive adhesive layer 22 By forming the first pressure-sensitive adhesive layer 21 and / or the second pressure-sensitive adhesive layer 22 using the pressure-sensitive adhesive composition containing the above-described structural units, the above-described high-temperature flexibility, room temperature flexibility, and high-temperature durability are excellent. Laminates 1 and 2 are easily obtained.
- Examples of (meth)acrylic acid alkyl esters having an alkyl group include butyl (meth)acrylate, isobutyl (meth)acrylate, t-butyl (meth)acrylate, methyl (meth)acrylate, and (meth)acrylic acid.
- the (meth)acrylic acid alkyl ester may be used alone or in combination of two or more.
- the content of the structural unit derived from the (meth)acrylic acid alkyl ester having the alkyl group relative to all the structural units of the (meth)acrylic polymer is preferably 50% by mass or more, and even if it is 60% by mass or more. It may be 70% by mass or more, 95% by mass or less, 90% by mass or less, or 85% by mass or less.
- the (meth)acrylic polymer is a (meth)acrylic acid alkyl ester having a homopolymer glass transition temperature of ⁇ 40° C. or less (hereinafter referred to as “low Tg (sometimes referred to as "monomer”.), and the (meth)acrylic acid alkyl ester whose homopolymer glass transition temperature exceeds 0 ° C. (hereinafter sometimes referred to as "high Tg monomer").
- first pressure-sensitive adhesive layer 21 and/or the second pressure-sensitive adhesive layer 22 using a pressure-sensitive adhesive composition containing such a (meth)acrylic polymer, the above-described high-temperature flexibility, normal-temperature flexibility, and It becomes easy to obtain laminates 1 and 2 having excellent high-temperature durability.
- 1 type(s) or 2 or more types may be used for a low Tg monomer and a high Tg monomer, respectively.
- the literature value such as POLYMER HANDBOOK (Wiley-Interscience) can be adopted.
- the (meth)acrylic polymer is further derived from a (meth)acrylic acid alkyl ester (hereinafter sometimes referred to as "medium Tg monomer”) whose homopolymer glass transition temperature is above -40 ° C. and 0 ° C. or less. It may contain structural units. One or more medium Tg monomers may be used.
- the glass transition temperature of the low Tg monomer may be -45°C or lower, or -50°C or lower.
- the content of structural units derived from low Tg monomers relative to all structural units of the acrylic polymer is, for example, 10% by mass or more, may be 30% by mass or more, or may be 50% by mass or more. Also, it may be 90% by mass or less, 85% by mass or less, or 80% by mass or less.
- the glass transition temperature of the high Tg monomer may be 10° C. or higher, 30° C. or higher, 50° C. or higher, 120° C. or lower, or 100° C. or lower. or 80° C. or lower.
- (Meth) content of the structural unit derived from the high Tg monomer relative to all structural units of the acrylic polymer is, for example, 5% by mass or more, may be 8% by mass or more, or may be 10% by mass or more Also, it may be 30% by mass or less, 25% by mass or less, or 20% by mass or less.
- the (meth)acrylic polymer may contain a structural unit derived from a monomer having a reactive functional group.
- the reactive functional group includes a functional group capable of forming a covalent bond by reacting with another functional group by exposure to active energy rays, heat treatment, or heat treatment with water.
- the heat-moisture treatment is a treatment of contacting with water or steam in a high-temperature environment (for example, a temperature of 85° C.), and may be a humidification treatment in a high-temperature environment.
- Examples of reactive functional groups include hydroxyl groups, carboxyl groups, amino groups, epoxy groups, and amide groups.
- 2-hydroxyethyl (meth)acrylate 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 3-hydroxybutyl (meth)acrylate, (Meth) 4-hydroxybutyl acrylate, 2-(2-hydroxyethoxy) ethyl (meth) acrylate, 2- or 3-chloro-2-hydroxypropyl (meth) acrylate, diethylene glycol mono (meth) acrylate, etc.
- (meth) acrylate having a hydroxyl group Ethylenically unsaturated carboxylic acids such as (meth)acrylic acid, crotonic acid, maleic acid, itaconic acid, citraconic acid, ⁇ -carboxyethyl (meth)acrylate; (Meth)acrylates having an amino group such as aminoethyl (meth)acrylate, n-butylaminoethyl (meth)acrylate, dimethylaminopropyl (meth)acrylate, and N,N-dimethylaminoethyl (meth)acrylate ; (Meth)acrylates having an epoxy group such as (3,4-epoxycyclohexyl)methyl (meth)acrylate and glycidyl (meth)acrylate; (meth)acrylamide, N,N-dimethyl(meth)acrylamide, N-methylol(meth)acrylamide having an amide group (meth)acrylate; (meth)acryloy
- the content of structural units derived from a monomer having a reactive functional group with respect to all structural units of the (meth)acrylic polymer is preferably 2% by mass or less, and may be less than 2% by mass. % or less.
- the (meth)acrylic polymer may not contain a structural unit derived from a monomer having a reactive functional group.
- the (meth)acrylic polymer may contain a monofunctional (meth)acrylic monomer having an alkoxy group, a caprolactone (meth)acrylic monomer, and the like.
- Examples of the alkoxy group possessed by the monofunctional (meth)acrylic monomer include methoxy group, ethoxy group, n-propoxy group, isopropoxy group, n-butoxy group, sec-butoxy group and tert-butoxy group.
- Examples of monofunctional (meth)acrylic monomers having an alkoxy group include ethoxyethoxyethyl acrylate (EOEOEA) and nonylphenol EO-modified acrylate [NP(EO)8A].
- the above monofunctional (meth)acrylic monomers may be used alone or in combination of two or more.
- the content of structural units derived from the monofunctional (meth)acrylic monomer relative to all structural units of the (meth)acrylic polymer is preferably 3% by mass or more, and may be 5% by mass or more. , may be 10% by mass or more, may be 20% by mass or more, may be 50% by mass or less, may be 45% by mass or less, or may be 40% by mass or less good too.
- caprolactone (meth)acrylic monomers examples include caprolactone acrylate.
- the content of structural units derived from caprolactone (meth)acrylic monomers relative to all structural units of the (meth)acrylic polymer may be 0.1% by mass or more, or may be 1% by mass or more, Moreover, it may be 30% by mass or less, or may be 20% by mass or less.
- the (meth)acrylic polymer is obtained by mixing the above-described monomers, adding a polymerization initiator, etc., and polymerizing the monomers.
- the polymerization method is not particularly limited, known polymerization methods such as solution polymerization, bulk polymerization, emulsion polymerization, and photopolymerization can be used.
- the (meth)acrylic polymer may be a random copolymer, block copolymer, or graft copolymer.
- the polymerization initiator may be selected according to the polymerization method, and examples thereof include cationic polymerization initiators and radical polymerization initiators.
- a photopolymerization initiator such as benzyl dimethyl ketal, 1-hydroxycyclohexylphenyl ketone, and 4-(2-hydroxyethoxy)phenyl(2-hydroxy-2-propyl)ketone. can be used.
- the weight average molecular weight (Mw) of the (meth)acrylic polymer is preferably 600,000 or more, may be 700,000 or more, may be 900,000 or more, and may be 2,000,000 or less. , may be 1.8 million or less, preferably 1.5 million or less.
- the weight average molecular weight (Mw) can be measured by the method described in Examples below.
- the adhesive composition contains one or more of the above (meth)acrylic polymers, and may further contain a (meth)acrylic compound and a polymerization initiator.
- the content of the (meth)acrylic polymer relative to the solid content of the pressure-sensitive adhesive composition is, for example, 50% by mass or more, may be 60% by mass or more, may be 65% by mass or more, or may be 70% by mass. 95% by mass or less, 90% by mass or less, 85% by mass or less, or 80% by mass or less.
- the (meth)acrylic compound As the (meth)acrylic compound, the above-described (meth)acrylic acid alkyl ester having an alkyl group having 1 to 24 carbon atoms, and the above-described monofunctional (meth)acrylic monomer having an alkoxy group. mentioned.
- the content of the (meth)acrylic compound relative to the solid content of the pressure-sensitive adhesive composition is, for example, 10% by mass or more, may be 15% by mass or more, may be 20% by mass or more, and may be 25% by mass. 50% by mass or less, 40% by mass or less, or 30% by mass or less.
- the (meth)acrylic acid alkyl ester having an alkyl group is preferably a (meth)acrylic acid alkyl ester having an alkyl group having from 9 to 15 carbon atoms, such as lauryl (meth)acrylate and (meth)acrylic acid. At least one of tridecyl acids is preferred.
- the content of the (meth)acrylic acid alkyl ester relative to the solid content of the pressure-sensitive adhesive composition is, for example, 5% by mass or more, may be 10% by mass or more, or may be 25% by mass or less. , 20% by mass or less, or 15% by mass or less.
- the monofunctional (meth)acrylic monomer having an alkoxy group is preferably ethoxyethoxyethyl acrylate.
- the content of the monofunctional (meth)acrylic monomer relative to the solid content of the pressure-sensitive adhesive composition is, for example, 0.1% by mass or more, may be 1% by mass or more, and may be 25% by mass or less. 20% by mass or less, 15% by mass or less, or 10% by mass or less.
- Polymerization initiators contained in the adhesive composition include photopolymerization initiators and thermal polymerization initiators. 1 type(s) or 2 or more types can be used for a polymerization initiator.
- the content of the polymerization initiator with respect to the solid content of the adhesive composition is, for example, 0.1% by mass or more, may be 1% by mass or more, or may be 10% by mass or less, and may be 5% by mass. % or less.
- photopolymerization initiators examples include benzyl dimethyl ketal, 1-hydroxycyclohexylphenyl ketone, and 4-(2-hydroxyethoxy)phenyl(2-hydroxy-2-propyl)ketone.
- Thermal polymerization initiators include azo compounds, organic peroxides, inorganic peroxides, and the like.
- azo compounds include 2,2′-azobisisobutyronitrile, 2,2′-azobis(2-methylbutyronitrile), 1,1′-azobis(cyclohexane 1-carbonitrile), 2 ,2'-azobis(2,4-dimethylvaleronitrile), 2,2'-azobis(2,4-dimethyl-4-methoxyvaleronitrile), dimethyl 2,2'-azobis(2-methylpropionate) , 4,4′-azobis(4-cyanovaleric acid), 2,2′-azobis(2-hydroxymethylpropionitrile), 2,2′-azobis[2-(2-imidazolin-2-yl) propane] and the like.
- organic peroxides examples include benzoyl peroxide, t-butylperbenzoate, cumene hydroperoxide, diisopropylperoxydicarbonate, di-n-propylperoxydicarbonate, di(2-ethoxyethyl)peroxy dicarbonate, t-butylperoxyneodecanoate, t-butylperoxybivalate, (3,5,5-trimethylhexanoyl)peroxide, dipropionylperoxide, diacetylperoxide and the like.
- inorganic peroxides examples include potassium persulfate, ammonium persulfate, and hydrogen peroxide.
- the adhesive composition contains antistatic agents such as cross-linking agents, silane coupling agents, cross-linking catalysts, weather stabilizers, tackifiers, plasticizers, softeners, dyes, pigments, inorganic fillers, light-scattering fine particles, and ionic compounds. It may contain additives such as
- cross-linking agents examples include isocyanate cross-linking agents, epoxy cross-linking agents, amine cross-linking agents, melamine cross-linking agents, aziridine cross-linking agents, hydrazine cross-linking agents, aldehyde cross-linking agents, oxazoline cross-linking agents, and metal alkoxide cross-linking agents. , metal chelate cross-linking agents, metal salt cross-linking agents, ammonium salt cross-linking agents, and the like.
- Silane coupling agents include organic silicon compounds having at least one alkoxysilyl group in the molecule.
- Silane coupling agents are, for example, Silicon compounds containing polymerizable unsaturated groups such as vinyltrimethoxysilane, vinyltriethoxysilane, methacryloxypropyltrimethoxysilane; Silicon compounds having an epoxy structure such as 3-glycidoxypropyltrimethoxysilane and 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane; Mercapto group-containing silicon compounds such as 3-mercaptopropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, 3-mercaptopropyldimethoxymethylsilane; Amino group-containing silicon compounds such as 3-aminopropyltrimethoxysilane, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, N-(2-aminoethy
- the adhesive composition can be prepared by mixing a (meth)acrylic polymer, a (meth)acrylic compound, a polymerization initiator, additives, and the like.
- the adhesive composition can form the first adhesive layer 21 or the second adhesive layer 22 by applying the adhesive composition itself or an organic solvent diluted solution of the adhesive composition on a substrate and drying it.
- Examples of methods for applying the adhesive composition or its organic solvent diluted solution include bar coating, knife coating, roll coating, blade coating, die coating, gravure coating and the like.
- the first pressure-sensitive adhesive layer 21 or the second pressure-sensitive adhesive layer 22 may be formed by subjecting the pressure-sensitive adhesive composition applied on the substrate to irradiation treatment with active energy rays, heat treatment, or the like.
- active energy rays include ultraviolet rays and electron beams, and ultraviolet rays are preferred.
- the front layer 11 may be a front plate that constitutes the outermost surface on the viewing side of the display device when the laminates 1 and 2 are applied to the display device, and includes a base layer and a first adhesive layer 21. It may be a substrate layer of a protective film. A protective film is usually provided so as to be peelable from the polarizing plate 30 .
- the front layer 11 may have a single layer structure or a multilayer structure.
- the thickness of the front layer 11 may be, for example, 10 ⁇ m or more, 20 ⁇ m or more, 30 ⁇ m or more, 500 ⁇ m or less, or 200 ⁇ m or less, It may be 100 ⁇ m or less.
- the front layer 11 is a front plate
- the front layer 11 is a resin plate (for example, a resin plate, a resin film, etc.) or a glass plate (for example, a glass plate, a glass film, etc.).
- the plate-like body made of resin is not limited as long as it can transmit light.
- Examples of the resin constituting the resin plate-like body such as a resin film include triacetyl cellulose, acetyl cellulose butyrate, ethylene-vinyl acetate copolymer, propionyl cellulose, butyryl cellulose, acetyl propionyl cellulose, polyester, polystyrene, Polyamide, polyetherimide, poly(meth)acrylic, polyimide, polyethersulfone, polysulfone, polyethylene, polypropylene, polymethylpentene, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, polyvinyl acetal, polyetherketone, polyetheretherketone , polyether sulfone, polymethyl methacrylate, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polyamideimide, and other polymers. These polymers can be used alone or in combination of two or more. From the viewpoint of improving strength and transparency,
- the resin plate-shaped body may be a resin film having a hard coat layer from the viewpoint of hardness.
- the hard coat layer may be formed on one side of the resin film, or may be formed on both sides. By providing the hard coat layer, hardness and scratch resistance can be improved.
- the hard coat layer is, for example, a cured layer of an ultraviolet curable resin.
- UV-curable resins include (meth)acrylic resins such as monofunctional (meth)acrylic resins, polyfunctional (meth)acrylic resins, and polyfunctional (meth)acrylic resins having a dendrimer structure. ) acrylic resins; silicone resins; polyester resins; urethane resins; amide resins;
- the hard coat layer may contain additives in order to improve strength.
- the additive is not particularly limited, and may be inorganic fine particles, organic fine particles, or a mixture thereof.
- Tempered glass for displays is preferably used for the glass plate.
- a front plate having excellent mechanical strength and surface hardness can be constructed.
- the base layer may be a resin film.
- the resin film can be formed, for example, from a thermoplastic resin used for forming a protective film to be described later.
- the tensile modulus of elasticity of the front layer 11 at a temperature of 60°C is preferably 2 GPa or more and 10 GPa or less, more preferably 3 GPa or more and 9 GPa or less, and still more preferably 4 GPa or more and 8 GPa or less.
- the tensile modulus can be measured at a temperature of 60° C. using a tensile tester (AG-1S, manufactured by Shimadzu Corporation).
- the polarizing plate 30 may include at least a linear polarizing layer.
- the polarizing plate 30 may be a linear polarizing plate (FIG. 1) or a circular polarizing plate (FIG. 2).
- the linear polarizing plate has a protective film 32 on one side or both sides of the linear polarizing layer 31 .
- the protective film 32 can be provided on one side or both sides of the linear polarizing layer 31 via a bonding layer (adhesive layer or adhesive layer).
- the linear polarizing plate preferably has a protective film 32 at least on the front layer 11 side of the linear polarizing layer 31 .
- the circularly polarizing plate has a linear polarizing layer 31 and a first retardation layer 33 (retardation layer) in order from the front layer 11 side.
- the circularly polarizing plate may have a linearly polarizing plate having a protective film 32 on one side or both sides of the linearly polarizing layer 31 and the first retardation layer 33 .
- the first retardation layer 33 is a ⁇ /4 retardation layer, and may be a ⁇ /4 retardation layer with reverse wavelength dispersion.
- the circularly polarizing plate may have a second retardation layer 34 in addition to the first retardation layer 33 .
- the second retardation layer 34 may be provided between the linear polarizing layer 31 and the first retardation layer 33, and may be provided between the first retardation layer 33 and the back layer 15 as shown in FIG. may be
- the second retardation layer 34 is preferably a ⁇ /2 retardation layer or a positive C layer.
- the first retardation layer 33 and the second retardation layer 34 may be laminated via a bonding layer 38 (adhesive layer or adhesive layer).
- the linearly polarizing plate may have a protective film 32 on one side of the linearly polarizing layer 31 .
- the first retardation layer 33 or the second retardation layer 34 is provided via the bonding layer (adhesive layer or pressure-sensitive adhesive layer) 37. good too.
- the linearly polarizing layer has a property of transmitting linearly polarized light having a plane of vibration perpendicular to the absorption axis when non-polarized light is incident thereon.
- the linear polarizing layer may be a polyvinyl alcohol-based resin film (hereinafter sometimes referred to as "PVA-based film”) in which iodine is adsorbed and oriented, and has a composition containing a compound having absorption anisotropy and liquid crystallinity. It may be a film containing a liquid crystalline polarizing layer formed by applying a substance to a substrate film.
- the compound having absorption anisotropy and liquid crystallinity may be a mixture of a dye having absorption anisotropy and a compound having liquid crystallinity, or may be a dye having absorption anisotropy and liquid crystallinity.
- the linear polarizing layer which is a PVA-based film
- a PVA-based film such as a polyvinyl alcohol film, a partially formalized polyvinyl alcohol film, an ethylene-vinyl acetate copolymer-based partially saponified film, to a dyeing treatment with iodine and a stretching treatment. and the like.
- the PVA-based film having iodine adsorbed and oriented by the dyeing treatment may be treated with an aqueous boric acid solution, followed by a washing step of washing off the aqueous boric acid solution.
- a known method can be adopted for each step.
- Polyvinyl alcohol-based resin (hereinafter sometimes referred to as "PVA-based resin”) can be produced by saponifying polyvinyl acetate-based resin.
- the polyvinyl acetate-based resin may be polyvinyl acetate, which is a homopolymer of vinyl acetate, or may be a copolymer of vinyl acetate and another monomer that can be copolymerized with vinyl acetate.
- Other monomers copolymerizable with vinyl acetate include, for example, unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and acrylamides having an ammonium group.
- the saponification degree of the PVA-based resin is usually about 85 to 100 mol%, preferably 98 mol% or more.
- the PVA-based resin may be modified, and for example, polyvinyl formal or polyvinyl acetal modified with aldehydes may be used.
- the average degree of polymerization of the PVA-based resin is usually about 1,000 to 10,000, preferably about 1,500 to 5,000.
- the degree of saponification and average degree of polymerization of the PVA-based resin can be obtained according to JIS K 6726 (1994). If the average degree of polymerization is less than 1,000, it is difficult to obtain desirable polarizing performance, and if it exceeds 10,000, film workability may be poor.
- a method for producing a linear polarizing layer involves preparing a base film, applying a solution of a resin such as a PVA-based resin on the base film, and performing drying or the like to remove the solvent. may include a step of forming a resin layer on the substrate.
- a primer layer can be formed in advance on the surface of the substrate film on which the resin layer is formed.
- the base film a film using a resin material described as a thermoplastic resin used for forming a protective film, which will be described later, can be used. Examples of the material for the primer layer include a resin obtained by cross-linking the hydrophilic resin used for the linear polarizing layer.
- the amount of solvent such as moisture in the resin layer is adjusted as necessary, then the base film and the resin layer are uniaxially stretched, and then the resin layer is dyed with iodine to adsorb and align iodine on the resin layer. .
- the resin layer in which iodine is adsorbed and oriented is treated with an aqueous boric acid solution, followed by a washing step of washing off the aqueous boric acid solution.
- a resin layer in which iodine is adsorbed and oriented that is, a PVA-based film to be a linear polarizing layer is produced.
- a known method can be adopted for each step.
- the amount of boric acid in the boric acid-containing aqueous solution for treating the PVA-based film or resin layer in which iodine is adsorbed and oriented is usually about 2 to 15 parts by mass, preferably 5 to 12 parts by mass, per 100 parts by mass of water.
- This boric acid-containing aqueous solution preferably contains potassium iodide.
- the amount of potassium iodide in the boric acid-containing aqueous solution is usually about 0.1 to 15 parts by mass, preferably about 5 to 12 parts by mass, per 100 parts by mass of water.
- the immersion time in the boric acid-containing aqueous solution is usually about 60 to 1,200 seconds, preferably about 150 to 600 seconds, more preferably about 200 to 400 seconds.
- the temperature of the boric acid-containing aqueous solution is usually 50°C or higher, preferably 50 to 85°C, more preferably 60 to 80°C.
- Uniaxial stretching of the PVA-based film, the substrate film and the resin layer may be performed before dyeing, during dyeing, or during boric acid treatment after dyeing. Uniaxial stretching may be performed in each of a plurality of stages.
- the PVA-based film, the base film and the resin layer may be uniaxially stretched in the MD direction (film transport direction). You may stretch
- the PVA-based film, the base film and the resin layer may be uniaxially stretched in the TD direction (the direction perpendicular to the film transport direction), in which case a so-called tenter method can be used.
- the stretching may be dry stretching in which the film is stretched in the atmosphere, or may be wet stretching in which the PVA-based film or resin layer is swollen with a solvent and then stretched.
- the draw ratio is 4 times or more, preferably 5 times or more, and particularly preferably 5.5 times or more. Although there is no particular upper limit for the draw ratio, it is preferably 8 times or less from the viewpoint of suppressing breakage and the like.
- a linear polarizing layer produced by a manufacturing method using a base film can be obtained by peeling off the base film after laminating a protective film. According to this method, the thickness of the linear polarizing layer can be further reduced.
- the thickness of the linear polarizing layer which is a PVA-based film, is preferably 1 ⁇ m or more, may be 2 ⁇ m or more, or may be 5 ⁇ m or more, and is preferably 30 ⁇ m or less, and 15 ⁇ m or less. is more preferable, and may be 10 ⁇ m or less, or may be 8 ⁇ m or less.
- a film containing a liquid crystalline polarizing layer is obtained by coating a base film with a composition containing a dye having liquid crystallinity and absorption anisotropy, or a composition containing a dye having absorption anisotropy and a polymerizable liquid crystal.
- a linear polarizing layer obtained by Examples of the base film include a film using a resin material described as a thermoplastic resin used for forming a protective film described later.
- Examples of the film containing a liquid crystalline polarizing layer include the polarizing layer described in JP-A-2013-33249.
- the total thickness of the substrate film and the linearly polarizing layer formed as described above is preferably as small as possible. It is 5 ⁇ m or less, more preferably 0.5 to 3 ⁇ m.
- thermoplastic resins include cellulose resins such as triacetyl cellulose; polyester resins such as polyethylene terephthalate and polyethylene naphthalate; polyethersulfone resins; polysulfone resins; polycarbonate resins; polyamide resins such as nylon and aromatic polyamides; Resin; polyolefin resin such as polyethylene, polypropylene, ethylene/propylene copolymer; cyclic polyolefin resin having cyclo-type and norbornene structure (also referred to as norbornene-based resin); (meth)acrylic resin; polyarylate resin; polystyrene resin; polyvinyl alcohol Resins, as well as mixtures thereof, may be mentioned.
- the protective film may have antireflection properties, antiglare properties, hard coat properties, etc. (Hereinafter, a protective film having such properties may be referred to as a "functional protective film.”).
- a protective film having such properties may be referred to as a "functional protective film.”
- one surface of the linear polarizing plate may be provided with a surface functional layer such as an antireflection layer, an antiglare layer, or a hard coat layer.
- the surface functional layer is preferably provided so as to be in direct contact with the protective film.
- the surface functional layer is preferably provided on the opposite side of the protective film from the linearly polarizing layer side.
- the thickness of the protective film is preferably 3 ⁇ m or more, more preferably 5 ⁇ m or more, and preferably 50 ⁇ m or less, more preferably 30 ⁇ m or less.
- the first retardation layer and the second retardation layer may be a stretched film, and includes a cured product layer of a polymerizable liquid crystal compound. However, it is preferably a cured product layer.
- the retardation layer is a stretched film
- a conventionally known stretched film can be used, and a retardation imparted by uniaxially or biaxially stretching a resin film can be used.
- resin films include cellulose films such as triacetyl cellulose and diacetyl cellulose, polyester films such as polyethylene terephthalate, polyethylene isophthalate and polybutylene terephthalate, acrylic resin films such as polymethyl (meth) acrylate and polyethyl (meth) acrylate, and polycarbonate films. , polyethersulfone film, polysulfone film, polyimide film, polyolefin film, polynorbornene film, etc., but not limited to these.
- the thickness of the retardation layer is usually 5 ⁇ m or more and 200 ⁇ m or less, preferably 10 ⁇ m or more and 80 ⁇ m or less, and more preferably 40 ⁇ m or less.
- a known polymerizable liquid crystal compound can be used as the polymerizable liquid crystal compound.
- a polymerizable liquid crystal compound is a compound having at least one polymerizable group and having liquid crystallinity.
- the type of polymerizable liquid crystal compound is not particularly limited, and rod-like liquid crystal compounds, discotic liquid crystal compounds, and mixtures thereof can be used.
- a cured product layer formed by polymerizing a polymerizable liquid crystal compound develops retardation by curing in a state in which the polymerizable liquid crystal compound is oriented in a suitable direction.
- the optical axis of the polymerizable liquid crystal compound coincides with the long axis direction of the polymerizable liquid crystal compound.
- the optical axis of the polymerizable liquid crystal compound exists in a direction orthogonal to the discotic surface of the polymerizable liquid crystal compound.
- the rod-like polymerizable liquid crystal compound for example, those described in JP-A-11-513019 (claim 1 etc.) can be preferably used.
- JP-A-2007-108732 paragraphs [0020] to [0067], etc.
- JP-A-2010-244038 paragraphs [0013] to [0108], etc.
- the polymerizable group possessed by the polymerizable liquid crystal compound means a group involved in the polymerization reaction, and is preferably a photopolymerizable group.
- a photopolymerizable group is a group that can participate in a polymerization reaction by an active radical generated from a photopolymerization initiator, an acid, or the like.
- Examples of the polymerizable group include vinyl group, vinyloxy group, 1-chlorovinyl group, isopropenyl group, 4-vinylphenyl group, (meth)acryloyloxy group, oxiranyl group, oxetanyl group, styryl group and allyl group. .
- the liquid crystallinity of the polymerizable liquid crystal compound may be either thermotropic liquid crystal or lyotropic liquid crystal, and thermotropic liquid crystal may be classified into nematic liquid crystal or smectic liquid crystal according to the degree of order.
- at least one type preferably has two or more polymerizable groups in the molecule.
- the retardation layer may contain an orientation layer.
- the orientation layer has an orientation regulating force that orients the polymerizable liquid crystal compound in a desired direction.
- the alignment layer may be a vertical alignment layer in which the molecular axis of the polymerizable liquid crystal compound is vertically aligned with respect to the plane direction of the laminate, and the molecular axis of the polymerizable liquid crystal compound is aligned horizontally with respect to the plane direction of the laminate. It may be a horizontally aligned layer or an inclined alignment layer in which the molecular axis of the polymerizable liquid crystal compound is tilted with respect to the planar direction of the laminate.
- the alignment layers may be the same as each other or different from each other.
- the alignment layer has a solvent resistance that does not dissolve when a composition for forming a liquid crystal layer containing a polymerizable liquid crystal compound is applied, etc., and has heat resistance to heat treatment for removing the solvent and aligning the polymerizable liquid crystal compound. things are preferred.
- the alignment layer include an alignment polymer layer formed of an alignment polymer, a photo-alignment polymer layer formed of a photo-alignment polymer, and a groove alignment layer having an uneven pattern or a plurality of grooves on the layer surface. can be done.
- the cured product layer is formed by applying a composition for forming a retardation layer containing a polymerizable liquid crystal compound and a solvent, and various additives as necessary, onto the alignment layer to form a coating film, and solidifying the coating film.
- a cured product layer of the polymerizable liquid crystal compound can be formed.
- the composition may be applied onto a substrate film to form a coating film, and the coating film may be stretched together with the substrate film to form a cured product layer.
- the composition may contain a polymerization initiator, a reactive additive, a leveling agent, a polymerization inhibitor, etc., in addition to the polymerizable liquid crystal compound and solvent described above.
- solvent, polymerization initiator, reactive additive, leveling agent, polymerization inhibitor, etc. known ones can be appropriately used.
- a film made of a resin material can be used, for example, a film made of the resin material described as the thermoplastic resin used for forming the protective film.
- the thickness of the base film is not particularly limited, it is generally preferably 1 to 300 ⁇ m or less, more preferably 20 to 200 ⁇ m, more preferably 30 to 120 ⁇ m from the viewpoint of workability such as strength and handleability. is more preferred.
- the base film may be incorporated in the laminate together with the cured layer of the polymerizable liquid crystal compound, and the base film is peeled off to remove only the cured layer of the polymerizable liquid crystal compound, or the cured layer and the orientation Layers may be incorporated into laminates.
- the back layer may be a separator, or may be a back plate, which is a member arranged on the opposite side of the viewing side of the display device.
- the back plate is, for example, a touch sensor panel, a display element, a combination thereof, or the like.
- the thickness of the back layer may be, for example, 5 ⁇ m or more, 10 ⁇ m or more, 30 ⁇ m or more, 50 ⁇ m or more, 2000 ⁇ m or less, or 1000 ⁇ m. It may be less than or equal to 500 ⁇ m or less.
- the separator When the back layer is a separator, the separator is releasably provided on the second pressure-sensitive adhesive layer and covers and protects the surface of the second pressure-sensitive adhesive layer.
- the separator has a substrate layer and a release treatment layer.
- the base layer may be a resin film.
- the resin film can be formed, for example, from the thermoplastic resin used for forming the protective film described above.
- the release treatment layer may be any known release treatment layer, and examples thereof include a layer formed by coating a base material layer with a release agent such as a fluorine compound or a silicone compound.
- the touch sensor panel can detect the position touched by the user's finger or the like.
- the touch sensor panel included in the back layer can be, for example, a touch sensor panel of resistive film type, capacitive coupling type, optical sensor type, ultrasonic wave type, electromagnetic induction coupling type, surface acoustic wave type, or the like.
- the display element is not particularly limited, but is preferably an organic EL display element.
- An organic EL display element can have, for example, a light-emitting layer and electrodes.
- the tensile modulus of elasticity of the back layer at a temperature of 60°C is preferably 2 GPa or more and 10 GPa or less, more preferably 3 GPa or more and 9 GPa or less, and still more preferably 4 GPa or more and 8 GPa or less.
- the tensile modulus of elasticity of the back layer is preferably higher than that of the front layer.
- the tensile modulus can be measured at a temperature of 60° C. using a tensile tester (AG-1S, manufactured by Shimadzu Corporation).
- the lamination layer is a pressure-sensitive adhesive layer or an adhesive layer.
- the bonding layer is an adhesive layer, it is an adhesive layer formed using an adhesive.
- a pressure-sensitive adhesive exhibits adhesiveness when it is attached to an adherend, and is a so-called pressure-sensitive adhesive.
- the pressure-sensitive adhesive may be the pressure-sensitive adhesive composition described above, or a known pressure-sensitive adhesive having excellent optical transparency can be used.
- Known pressure-sensitive adhesives that can be used include, for example, pressure-sensitive adhesives containing base polymers such as acrylic polymers, urethane polymers, silicone polymers, and polyvinyl ethers.
- the adhesive may be an active energy ray-curable adhesive, a thermosetting adhesive, or the like.
- a pressure-sensitive adhesive containing an acrylic resin as a base polymer which is excellent in transparency, adhesive strength, removability (reworkability), weather resistance, heat resistance, etc.
- the pressure-sensitive adhesive layer is preferably composed of a pressure-sensitive adhesive containing a (meth)acrylic resin, a cross-linking agent, and a silane coupling agent, and may contain other components.
- the thickness of the adhesive layer is not particularly limited, but is preferably 5 ⁇ m or more, may be 10 ⁇ m or more, may be 15 ⁇ m or more, may be 20 ⁇ m or more, or may be 25 ⁇ m or more, It is usually 300 ⁇ m or less, may be 250 ⁇ m or less, may be 100 ⁇ m or less, or may be 50 ⁇ m or less.
- the adhesive layer can be formed by curing the curable component in the adhesive composition.
- the adhesive composition for forming the adhesive layer include adhesives other than pressure-sensitive adhesives (adhesives), such as water-based adhesives and active energy ray-curable adhesives.
- water-based adhesives include adhesives in which polyvinyl alcohol resin is dissolved or dispersed in water.
- the method of drying when a water-based adhesive is used is not particularly limited. For example, a method of drying using a hot air dryer or an infrared ray dryer can be employed.
- Active energy ray-curable adhesives include, for example, solvent-free active energy ray-curable adhesives containing curable compounds that are cured by irradiation with active energy rays such as ultraviolet rays, visible light, electron beams, and X-rays. mentioned. Adhesion between layers can be improved by using a non-solvent active energy ray-curable adhesive.
- the active energy ray-curable adhesive preferably contains either one or both of a cationic polymerizable curable compound and a radically polymerizable curable compound because it exhibits good adhesiveness.
- the active energy ray-curable adhesive can further contain a cationic polymerization initiator such as a photocationic polymerization initiator or a radical polymerization initiator for initiating the curing reaction of the curable compound.
- the thickness is preferably 0.1 ⁇ m or more, and may be 0.5 ⁇ m or more, and preferably 10 ⁇ m or less, and may be 5 ⁇ m or less. .
- the display device includes laminates 1 and 2 .
- the display device is preferably a flexible display that can be bent so that the back layer 15 is on the inside.
- the term "bendable" means that the laminates 1 and 2 can be bent without generating air bubbles or pressure-sensitive adhesive removal, with the number of times of bending being less than 100,000 in a high-temperature bending test described later.
- the front layer 11 is preferably the front panel
- the back layer 15 preferably includes at least one of the touch sensor panel and the display element.
- the display device is not particularly limited, it is preferably an organic EL display device.
- the display device may be a mobile terminal such as a smartphone or tablet, a television, a digital photo frame, an electronic signboard, a measuring instrument or instruments, an office device, a medical device, a computing device, or the like.
- the thickness was measured using a contact-type film thickness measuring device (“ZC-101” manufactured by Nikon Corporation).
- the separator was peeled off from the adhesive sheet described below to obtain an adhesive layer.
- the glass transition temperature of the obtained pressure-sensitive adhesive layer was measured using a differential scanning calorimeter (DSC) "EXSTAR DSC6000" manufactured by SII Nanotechnology Co., Ltd. under a nitrogen atmosphere, measuring temperature range -80 to 50 ° C., increasing. Measurement was performed under the condition of a temperature rate of 10°C/min.
- the pressure-sensitive adhesive layer wrapped in the polyester mesh was immersed in ethyl acetate at room temperature (23° C.) for 72 hours, and a sample was taken out (hereinafter, the taken out sample is referred to as a “sample after immersion”. ).
- FIGS. 3(a) and 3(b) are diagrams schematically showing the method of the high-temperature flexibility test.
- a bending device STS-VRT-500 manufactured by Science Town
- the test piece 100 was placed on stages 501 and 502 so that the back layer side faced upward (FIG. 3(a)).
- Two stages 501 and 502 were arranged with a gap C1, and the test piece 100 was fixed and arranged so that the center in the width direction was positioned at the center of the gap C1 (FIG. 3(a)).
- the stages 501 and 502 are swingable, and initially the two stages 501 and 502 form the same plane.
- the two stages 501 and 502 are rotated upward by 90 degrees with the positions P1 and P2 as the centers of the rotation axes, and the two stages 501 and 502 are closed ( FIG. 3(b)), the action of opening the stages 501 and 502 again is defined as one bending.
- the weight average molecular weight Mw of the (meth)acrylic polymer was measured by using four columns of "TSK gel XL” manufactured by Tosoh Corporation and "Shodex GPC KF-802" manufactured by Showa Denko Co., Ltd. as columns in the GPC apparatus. A total of 5 tubes were connected in series, and tetrahydrofuran was used as the eluent, the sample concentration was 5 mg/mL, the sample introduction amount was 100 ⁇ L, the temperature was 40° C., and the flow rate was 1 mL/min. . The conditions for obtaining the GPC emission curve were the same.
- TDA tridecyl acrylate (glass transition temperature: -55°C)
- IDA isodecyl acrylate (glass transition temperature: -60°C)
- EOEOEA ethoxyethoxyethyl acrylate (glass transition temperature: -56°C)
- CA caprolactone acrylate (glass transition temperature: -40°C)
- 2-EHA 2-ethylhexyl acrylate (glass transition temperature: -70°C)
- BA n-butyl acrylate (glass transition temperature: -55 ° C.)
- 2-HEA 2-hydroxyethyl acrylate (glass transition temperature: -15 ° C.)
- LA Lauryl acrylate (glass transition temperature: 15°C)
- DCA docosyl acrylate MMA: methyl methacrylate (glass transition temperature: 105°C)
- I-651 benzyl dimethyl ketal
- I-184 1-hydroxycyclohexyl phenyl
- the UV irradiation was performed so that the integrated light amount was 400 mJ/cm 2 and the illuminance was 1.8 mW/cm 2 (UVV standard).
- the adhesive layers of the obtained adhesive sheets (1) to (10) were measured for tan ⁇ at a thickness temperature of 60° C., storage elastic modulus G′, thickness, glass transition temperature Tg, and gel fraction. Table 3 shows the results.
- a front plate was prepared by forming a hard coat layer (10 ⁇ m thick) on one side of a resin film (polyimide resin film, thickness 40 ⁇ m).
- the hard coat layer was a layer formed from a composition containing a dendrimer compound having a polyfunctional acrylic group at its end.
- a linear polarizing plate having a layer structure of protective film/adhesive layer/linear polarizing layer obtained by laminating a protective film (cycloolefin resin film, thickness 18 ⁇ m) and a linear polarizing layer (thickness 8 ⁇ m) using a water-based adhesive. got
- a retardation laminate was obtained in which the first retardation layer (thickness 3 ⁇ m), the adhesive layer (thickness 1 ⁇ m), and the second retardation layer (thickness 2 ⁇ m) were laminated in this order.
- the first retardation layer was a ⁇ /4 retardation layer and a cured layer of a polymerizable liquid crystal compound.
- the adhesive layer was a cured product layer of an epoxy adhesive, which is a photocurable adhesive composition.
- the second retardation layer was a positive C layer and a cured layer of a polymerizable liquid crystal compound.
- the linear polarizing layer side of the linear polarizing plate obtained above and the first retardation layer side of the retardation laminate are bonded using an adhesive layer (acrylic adhesive, thickness 5 ⁇ m) to form a polarizing plate.
- a circularly polarizing plate was obtained.
- the layer structure of the circularly polarizing plate was linearly polarizing plate (protective film/adhesive layer/linearly polarizing layer)/retardation laminate (first retardation layer/adhesive layer/second retardation layer).
- laminates (1) to (12) The resin film side of the front layer obtained above and the linear polarizing plate side of the circular polarizing plate are bonded using the first adhesive layer shown in Tables 4 and 5, and the retardation laminate side of the circular polarizing plate A second pressure-sensitive adhesive layer and a separator shown in Tables 4 and 5 were laminated on the above to prepare laminates (1) to (12).
- the layer structure of laminates (1) to (12) is front layer (hard coat layer/resin film)/first adhesive layer/linear polarizing plate (protective film/adhesive layer/linear polarizing layer)/retardation laminate. It was a body (first retardation layer/adhesive layer/second retardation layer)/second pressure-sensitive adhesive layer/separator.
- the obtained laminates (1) to (10) were subjected to a high temperature flexibility test, a room temperature flexibility test, and a high temperature durability test. The results are shown in Tables 4 and 5.
- 1,2 laminate 11 front layer, 15 back layer, 21 first adhesive layer, 22 second adhesive layer, 30 polarizing plate, 31 linear polarizing layer, 32 protective film, 33 first retardation layer (retardation layer), 34 second retardation layer, 37, 38 bonding layer, 100 test piece, 501, 502 stage.
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Abstract
Description
〔1〕 前面層、第1粘着剤層、少なくとも直線偏光層を含む偏光板、第2粘着剤層、及び背面層をこの順に有し、
前記第1粘着剤層の温度60℃におけるtanδをD1とし、前記第2粘着剤層の温度60℃におけるtanδをD2とするとき、下記式(1)及び式(2)の関係を満たす、積層体。
D1<D2 (1)
0.2≦D2≦1.0 (2)
〔2〕 前記第2粘着剤層の厚みは、15μm以上50μm以下である、〔1〕に記載の積層体。
〔3〕 前記第2粘着剤層のガラス転移温度は、-55℃以下である、〔1〕又は〔2〕に記載の積層体。
〔4〕 前記第2粘着剤層のゲル分率は、45%以上85%以下である、〔1〕~〔3〕のいずれかに記載の積層体。
〔5〕 前記第2粘着剤層は、(メタ)アクリル系ポリマーを含む粘着剤組成物から形成され、
前記(メタ)アクリル系ポリマーは、炭素数が1以上24以下のアルキル基を有する(メタ)アクリル酸アルキルエステルに由来する構成単位を含む、〔1〕~〔4〕のいずれかに記載の積層体。
〔6〕 前記(メタ)アクリル系ポリマーは、炭素数が20以上24以下のアルキル基を有する(メタ)アクリル酸アルキルエステルに由来する構成単位を含む、〔5〕に記載の積層体。
〔7〕 前記(メタ)アクリル系ポリマーを構成する全構成単位に対する反応性官能基を有するモノマーに由来する構成単位の含有量は、2質量%以下である、〔5〕又は〔6〕に記載の積層体。
〔8〕 前記偏光板は、前記前面層側から順に、前記直線偏光層及び位相差層を有する円偏光板である、〔1〕~〔7〕のいずれかに記載の積層体。
〔9〕 前記背面層は、前記第2粘着剤層側から順に、離型処理層及び基材層を有するセパレータである、〔1〕~〔8〕のいずれかに記載の積層体。
〔10〕 〔1〕~〔8〕のいずれかに記載の積層体を含む、表示装置。
〔11〕 前記背面層が内側となるように屈曲可能である、〔10〕に記載の表示装置。 The present invention provides the following laminate and display device.
[1] having a front layer, a first adhesive layer, a polarizing plate including at least a linear polarizing layer, a second adhesive layer, and a back layer in this order,
When tan δ at a temperature of 60 ° C. of the first pressure-sensitive adhesive layer is D1 and tan δ at a temperature of 60 ° C. of the second pressure-sensitive adhesive layer is D2, the relationship of the following formulas (1) and (2) is satisfied. body.
D1<D2 (1)
0.2≤D2≤1.0 (2)
[2] The laminate according to [1], wherein the second pressure-sensitive adhesive layer has a thickness of 15 μm or more and 50 μm or less.
[3] The laminate according to [1] or [2], wherein the glass transition temperature of the second adhesive layer is -55°C or lower.
[4] The laminate according to any one of [1] to [3], wherein the second pressure-sensitive adhesive layer has a gel fraction of 45% or more and 85% or less.
[5] The second pressure-sensitive adhesive layer is formed from a pressure-sensitive adhesive composition containing a (meth)acrylic polymer,
The laminate according to any one of [1] to [4], wherein the (meth)acrylic polymer contains a structural unit derived from a (meth)acrylic acid alkyl ester having an alkyl group having 1 to 24 carbon atoms. body.
[6] The laminate according to [5], wherein the (meth)acrylic polymer includes a structural unit derived from a (meth)acrylic acid alkyl ester having an alkyl group having 20 to 24 carbon atoms.
[7] The content of structural units derived from a monomer having a reactive functional group with respect to all structural units constituting the (meth)acrylic polymer is 2% by mass or less, according to [5] or [6] laminate.
[8] The laminate according to any one of [1] to [7], wherein the polarizing plate is a circularly polarizing plate having the linear polarizing layer and the retardation layer in order from the front layer side.
[9] The laminate according to any one of [1] to [8], wherein the back layer is a separator having a release treatment layer and a substrate layer in order from the second pressure-sensitive adhesive layer side.
[10] A display device comprising the laminate according to any one of [1] to [8].
[11] The display device of [10], wherein the back layer is bendable so as to face inside.
図1及び図2は、本実施形態の積層体の一例を模式的に示す概略断面図である。積層体1,2は、前面層11、第1粘着剤層21、偏光板30、第2粘着剤層22、及び背面層15をこの順に有する。前面層11は、偏光板30の視認側に設けられる層であり、背面層15は、偏光板30の視認側とは反対側に設けられる層である。積層体1,2において、第1粘着剤層21は、前面層11及び偏光板30に直接接していることが好ましい。第2粘着剤層22は、偏光板30及び背面層15に直接接していることが好ましい。偏光板30は、少なくとも直線偏光層31を含み、後述するように直線偏光板であってもよく、円偏光板であってもよい。 (Laminate)
1 and 2 are schematic cross-sectional views schematically showing an example of the laminate of the present embodiment.
D1<D2 (1)
0.2≦D2≦1.0 (2) In the
D1<D2 (1)
0.2≤D2≤1.0 (2)
D1=G”1/G’1
D2=G”2/G’2
上記G’1、G’2、G”1、及びG”2は、後述する実施例に記載の方法によって測定することができ、これらの測定値からD1及びD2を求めることができる。 D1 and D2 of the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer at a temperature of 60°C are G'1 and G'2, respectively, the storage elastic moduli of the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer at a temperature of 60°C. When the loss elastic moduli of the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer at a temperature of 60° C. are G″1 and G″2, respectively, the values are represented by the following equations.
D1=G"1/G'1
D2=G"2/G'2
The above G'1, G'2, G''1, and G''2 can be measured by the method described in Examples below, and D1 and D2 can be obtained from these measured values.
第1粘着剤層21及び第2粘着剤層22は、(メタ)アクリル系ポリマーを含む粘着剤組成物から形成されることが好ましい。第1粘着剤層21を形成する粘着剤組成物の組成と、第2粘着剤層22を形成する粘着剤組成物の組成とは通常異なる。本明細書において「(メタ)アクリル系ポリマー」とは、アクリル系ポリマー及びメタクリル系ポリマーよりなる群から選ばれる少なくとも1種を表す。その他の「(メタ)」を付した用語においても同様である。 (First adhesive layer, second adhesive layer)
The first pressure-
粘着剤組成物に含まれる(メタ)アクリル系ポリマーは、炭素数が1以上24以下のアルキル基を有する(メタ)アクリル酸アルキルエステル(モノマー)に由来する構成単位を含むことが好ましい。(メタ)アクリル系ポリマーは、炭素数が20以上24以下のアルキル基を有する(メタ)アクリル酸アルキルエステルに由来する構成単位を含むことがより好ましい。アルキル基は、直鎖状であってもよく、分岐鎖状であってもよい。上記構成単位を含む粘着剤組成物を用いて第1粘着剤層21及び/又は第2粘着剤層22を形成することにより、上記した高温屈曲性、常温屈曲性、及び高温耐久性に優れた積層体1,2が得られやすくなる。 (Adhesive composition)
The (meth)acrylic polymer contained in the pressure-sensitive adhesive composition preferably contains a structural unit derived from a (meth)acrylic acid alkyl ester (monomer) having an alkyl group having 1 to 24 carbon atoms. The (meth)acrylic polymer more preferably contains structural units derived from a (meth)acrylic acid alkyl ester having an alkyl group having 20 or more and 24 or less carbon atoms. Alkyl groups may be linear or branched. By forming the first pressure-
(メタ)アクリル酸2-ヒドロキシエチル、(メタ)アクリル酸2-ヒドロキシプロピル、(メタ)アクリル酸3-ヒドロキシプロピル、(メタ)アクリル酸2-ヒドロキシブチル、(メタ)アクリル酸3-ヒドロキシブチル、(メタ)アクリル酸4-ヒドロキシブチル、(メタ)アクリル酸2-(2-ヒドロキシエトキシ)エチル、(メタ)アクリル酸2-又は3-クロロ-2-ヒドロキシプロピル、ジエチレングリコールモノ(メタ)アクリレート等の水酸基を有する(メタ)アクリレート;
(メタ)アクリル酸、クロトン酸、マレイン酸、イタコン酸、シトラコン酸、β-カルボキシエチル(メタ)アクリレート等のエチレン性不飽和カルボン酸;
(メタ)アクリル酸アミノエチル、(メタ)アクリル酸n-ブチルアミノエチル、(メタ)アクリル酸ジメチルアミノプロピル、(メタ)アクリル酸N,N-ジメチルアミノエチル等のアミノ基を有する(メタ)アクリレート;
(メタ)アクリル酸(3,4-エポキシシクロヘキシル)メチル、(メタ)アクリル酸グリシジル等のエポキシ基を有する(メタ)アクリレート;
(メタ)アクリルアミド、N,N-ジメチル(メタ)アクリルアミド、N-メチロール(メタ)アクリルアミド等のアミド基を有する(メタ)アクリレート;
(メタ)アクリロイルモルホリン、ビニルカプロラクタム、N-ビニル-2-ピロリドン、ビニルピリジン、テトラヒドロフルフリル(メタ)アクリレート等の複素環基を有するモノマー;
等が挙げられる。反応性官能基を有するモノマーは、1種のみを単独で用いてもよく、2種以上を併用してもよい。 As a monomer having a reactive functional group,
2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 3-hydroxybutyl (meth)acrylate, (Meth) 4-hydroxybutyl acrylate, 2-(2-hydroxyethoxy) ethyl (meth) acrylate, 2- or 3-chloro-2-hydroxypropyl (meth) acrylate, diethylene glycol mono (meth) acrylate, etc. (meth) acrylate having a hydroxyl group;
Ethylenically unsaturated carboxylic acids such as (meth)acrylic acid, crotonic acid, maleic acid, itaconic acid, citraconic acid, β-carboxyethyl (meth)acrylate;
(Meth)acrylates having an amino group such as aminoethyl (meth)acrylate, n-butylaminoethyl (meth)acrylate, dimethylaminopropyl (meth)acrylate, and N,N-dimethylaminoethyl (meth)acrylate ;
(Meth)acrylates having an epoxy group such as (3,4-epoxycyclohexyl)methyl (meth)acrylate and glycidyl (meth)acrylate;
(meth)acrylamide, N,N-dimethyl(meth)acrylamide, N-methylol(meth)acrylamide having an amide group (meth)acrylate;
(meth)acryloylmorpholine, vinylcaprolactam, N-vinyl-2-pyrrolidone, vinylpyridine, monomers having a heterocyclic group such as tetrahydrofurfuryl (meth)acrylate;
etc. Monomers having a reactive functional group may be used alone or in combination of two or more.
ビニルトリメトキシシラン、ビニルトリエトキシシラン、メタクリロキシプロピルトリメトキシシラン等の重合性不飽和基含有ケイ素化合物;
3-グリシドキシプロピルトリメトキシシラン、2-(3,4-エポキシシクロヘキシル)エチルトリメトキシシラン等のエポキシ構造を有するケイ素化合物;
3-メルカプトプロピルトリメトキシシラン、3-メルカプトプロピルトリエトキシシラン、3-メルカプトプロピルジメトキシメチルシラン等のメルカプト基含有ケイ素化合物;
3-アミノプロピルトリメトキシシラン、N-(2-アミノエチル)-3-アミノプロピルトリメトキシシラン、N-(2-アミノエチル)-3-アミノプロピルメチルジメトキシシラン等のアミノ基含有ケイ素化合物;
3-クロロプロピルトリメトキシシラン、3-イソシアネートプロピルトリエトキシシラン、あるいはこれらの少なくとも1つと、メチルトリエトキシシラン、エチルトリエトキシシラン、メチルトリメトキシシラン、エチルトリメトキシシラン等のアルキル基含有ケイ素化合物との縮合物
等が挙げられる。 Silane coupling agents include organic silicon compounds having at least one alkoxysilyl group in the molecule. Silane coupling agents are, for example,
Silicon compounds containing polymerizable unsaturated groups such as vinyltrimethoxysilane, vinyltriethoxysilane, methacryloxypropyltrimethoxysilane;
Silicon compounds having an epoxy structure such as 3-glycidoxypropyltrimethoxysilane and 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane;
Mercapto group-containing silicon compounds such as 3-mercaptopropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, 3-mercaptopropyldimethoxymethylsilane;
Amino group-containing silicon compounds such as 3-aminopropyltrimethoxysilane, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, N-(2-aminoethyl)-3-aminopropylmethyldimethoxysilane;
3-chloropropyltrimethoxysilane, 3-isocyanatopropyltriethoxysilane, or at least one of these, and an alkyl group-containing silicon compound such as methyltriethoxysilane, ethyltriethoxysilane, methyltrimethoxysilane, ethyltrimethoxysilane, etc. and condensates of.
前面層11は、積層体1,2を表示装置に適用した場合に表示装置の視認側の最表面を構成する前面板であってもよく、基材層と第1粘着剤層21とを含むプロテクトフィルムの基材層であってもよい。プロテクトフィルムは通常、偏光板30に対して剥離可能に設けられる。 (front layer)
The
偏光板30は、少なくとも直線偏光層を含むものであればよい。偏光板30は、直線偏光板であってもよく(図1)、円偏光板であってもよい(図2)。直線偏光板は、直線偏光層31の片面又は両面に保護フィルム32を有する。保護フィルム32は、直線偏光層31の片面又は両面に、貼合層(接着剤層又は粘着剤層)を介して設けることができる。直線偏光板は、図1及び図2に示すように、少なくとも直線偏光層31の前面層11側に保護フィルム32を有することが好ましい。 (Polarizer)
The
直線偏光層は、無偏光の光を入射させたとき、吸収軸に直交する振動面をもつ直線偏光を透過させる性質を有する。直線偏光層は、ヨウ素が吸着配向しているポリビニルアルコール系樹脂フィルム(以下、「PVA系フィルム」ということがある。)であってもよく、吸収異方性及び液晶性を有する化合物を含む組成物を基材フィルムに塗布して形成した液晶性の偏光層を含むフィルムであってもよい。吸収異方性及び液晶性を有する化合物は、吸収異方性を有する色素と液晶性を有する化合物との混合物であってもよく、吸収異方性及び液晶性を有する色素であってもよい。 (linear polarizing layer)
The linearly polarizing layer has a property of transmitting linearly polarized light having a plane of vibration perpendicular to the absorption axis when non-polarized light is incident thereon. The linear polarizing layer may be a polyvinyl alcohol-based resin film (hereinafter sometimes referred to as "PVA-based film") in which iodine is adsorbed and oriented, and has a composition containing a compound having absorption anisotropy and liquid crystallinity. It may be a film containing a liquid crystalline polarizing layer formed by applying a substance to a substrate film. The compound having absorption anisotropy and liquid crystallinity may be a mixture of a dye having absorption anisotropy and a compound having liquid crystallinity, or may be a dye having absorption anisotropy and liquid crystallinity.
保護フィルムとしては、例えば、透明性、機械的強度、熱安定性、水分遮断性、等方性、延伸性等に優れる熱可塑性樹脂から形成されたフィルムが用いられる。熱可塑性樹脂の具体例としては、トリアセチルセルロース等のセルロース樹脂;ポリエチレンテレフタレート、ポリエチレンナフタレート等のポリエステル樹脂;ポリエーテルスルホン樹脂;ポリスルホン樹脂;ポリカーボネート樹脂;ナイロンや芳香族ポリアミド等のポリアミド樹脂;ポリイミド樹脂;ポリエチレン、ポリプロピレン、エチレン・プロピレン共重合体等のポリオレフィン樹脂;シクロ系及びノルボルネン構造を有する環状ポリオレフィン樹脂(ノルボルネン系樹脂ともいう);(メタ)アクリル樹脂;ポリアリレート樹脂;ポリスチレン樹脂;ポリビニルアルコール樹脂、並びにこれらの混合物を挙げることができる。 (Protective film)
As the protective film, for example, a film formed from a thermoplastic resin that is excellent in transparency, mechanical strength, thermal stability, water barrier properties, isotropy, stretchability and the like is used. Specific examples of thermoplastic resins include cellulose resins such as triacetyl cellulose; polyester resins such as polyethylene terephthalate and polyethylene naphthalate; polyethersulfone resins; polysulfone resins; polycarbonate resins; polyamide resins such as nylon and aromatic polyamides; Resin; polyolefin resin such as polyethylene, polypropylene, ethylene/propylene copolymer; cyclic polyolefin resin having cyclo-type and norbornene structure (also referred to as norbornene-based resin); (meth)acrylic resin; polyarylate resin; polystyrene resin; polyvinyl alcohol Resins, as well as mixtures thereof, may be mentioned.
第1位相差層及び第2位相差層(以下、両者をまとめて「位相差層」ということがある。)は、延伸フィルムであってもよく、重合性液晶化合物の硬化物層を含むものであってもよいが、硬化物層であることが好ましい。 (First retardation layer, second retardation layer)
The first retardation layer and the second retardation layer (hereinafter both may be collectively referred to as "retardation layer".) may be a stretched film, and includes a cured product layer of a polymerizable liquid crystal compound. However, it is preferably a cured product layer.
背面層は、セパレータであってもよく、表示装置の視認側とは反対側に配置される部材である背面板であってもよい。背面板は、例えば、タッチセンサパネル、表示素子、及びこれらの組み合わせ等である。 (back layer)
The back layer may be a separator, or may be a back plate, which is a member arranged on the opposite side of the viewing side of the display device. The back plate is, for example, a touch sensor panel, a display element, a combination thereof, or the like.
貼合層は、粘着剤層又は接着剤層である。貼合層が粘着剤層である場合、粘着剤を用いて形成された粘着剤層である。粘着剤は、それ自体を被着体に貼り付けることで接着性を発現するものであり、いわゆる感圧型接着剤と称されるものである。粘着剤は、上記で説明した粘着剤組成物であってもよく、また、公知の光学的な透明性に優れる粘着剤を用いることができる。公知の粘着剤は、例えば、アクリルポリマー、ウレタンポリマー、シリコーンポリマー、ポリビニルエーテル等のベースポリマーを含有する粘着剤を用いることができる。また、粘着剤は、活性エネルギー線硬化型粘着剤、又は、熱硬化型粘着剤等であってもよい。これらの中でも、透明性、粘着力、再剥離性(リワーク性)、耐候性、耐熱性等に優れるアクリル樹脂をベースポリマーとした粘着剤が好適である。粘着剤層は、(メタ)アクリル樹脂、架橋剤、シランカップリング剤を含む粘着剤から構成されることが好ましく、その他の成分を含んでいてもよい。 (Lamination layer)
The lamination layer is a pressure-sensitive adhesive layer or an adhesive layer. When the bonding layer is an adhesive layer, it is an adhesive layer formed using an adhesive. A pressure-sensitive adhesive exhibits adhesiveness when it is attached to an adherend, and is a so-called pressure-sensitive adhesive. The pressure-sensitive adhesive may be the pressure-sensitive adhesive composition described above, or a known pressure-sensitive adhesive having excellent optical transparency can be used. Known pressure-sensitive adhesives that can be used include, for example, pressure-sensitive adhesives containing base polymers such as acrylic polymers, urethane polymers, silicone polymers, and polyvinyl ethers. Also, the adhesive may be an active energy ray-curable adhesive, a thermosetting adhesive, or the like. Among these, a pressure-sensitive adhesive containing an acrylic resin as a base polymer, which is excellent in transparency, adhesive strength, removability (reworkability), weather resistance, heat resistance, etc., is preferable. The pressure-sensitive adhesive layer is preferably composed of a pressure-sensitive adhesive containing a (meth)acrylic resin, a cross-linking agent, and a silane coupling agent, and may contain other components.
表示装置は、積層体1,2を含む。表示装置は、背面層15が内側となるように屈曲可能であるフレキシブルディスプレイであることが好ましい。屈曲可能であるとは、後述する高温屈曲性試験による屈曲回数が10万回未満で、積層体1,2に気泡又は粘着剤抜けを発生させることなく屈曲させ得ることを意味する。 (Display device)
The display device includes
温度60℃における第1粘着剤層及び第2粘着剤層のtanδは、粘弾性測定装置(MCR-301、Anton Paar社)を使用して測定した。粘着シートを幅20mm×長さ20mmに切り出した後、セパレータを剥がし、厚みが150μmとなるように複数枚積層してガラス板に貼合した後、測定チップと接着した状態で-20℃から80℃の温度領域で周波数1.0Hz、変形量1%、昇温速度2℃/分の条件下にて測定を行い、温度60℃における貯蔵弾性率G’及び損失弾性率G”を求め、tanδを求めた。 [Measurement of storage modulus G' and calculation of tan δ]
The tan δ of the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer at a temperature of 60° C. was measured using a viscoelasticity measuring device (MCR-301, Anton Paar). After cutting the adhesive sheet into 20 mm width × 20 mm length, the separator was peeled off, and a plurality of sheets were laminated so that the thickness was 150 μm. Measurement was performed in a temperature range of 1.0 Hz, a deformation amount of 1%, and a temperature increase rate of 2 ° C./min. asked for
厚みは、接触式膜厚測定装置(株式会社ニコン製「ZC-101」)を用いて測定した。 [Thickness measurement]
The thickness was measured using a contact-type film thickness measuring device (“ZC-101” manufactured by Nikon Corporation).
後述する粘着シートからセパレータを剥離し、粘着剤層を得た。得られた粘着剤層のガラス転移温度は、エスアイアイ・ナノテクノロジー(株)製の示差走査熱量計(DSC)「EXSTAR DSC6000」を用い、窒素雰囲気下、測定温度範囲-80~50℃、昇温速度10℃/分の条件で測定した。 [Measurement of glass transition temperature]
The separator was peeled off from the adhesive sheet described below to obtain an adhesive layer. The glass transition temperature of the obtained pressure-sensitive adhesive layer was measured using a differential scanning calorimeter (DSC) "EXSTAR DSC6000" manufactured by SII Nanotechnology Co., Ltd. under a nitrogen atmosphere, measuring temperature range -80 to 50 ° C., increasing. Measurement was performed under the condition of a temperature rate of 10°C/min.
粘着シートを幅80mm×長さ80mmに切り出した後、切り出した粘着シートに含まれる粘着剤層を試料とした。試料をポリエステル製メッシュ(メッシュサイズ200)に包み、その質量を精密天秤を用いて秤量した。秤量した質量から上記メッシュ単独の質量を差し引くことにより、試料のみの質量M1を算出した。 [Measurement of gel fraction]
After cutting out the pressure-sensitive adhesive sheet into a size of 80 mm in width and 80 mm in length, the pressure-sensitive adhesive layer contained in the cut-out pressure-sensitive adhesive sheet was used as a sample. The sample was wrapped in a polyester mesh (mesh size 200) and its mass was weighed using a precision balance. The mass M1 of the sample alone was calculated by subtracting the mass of the mesh alone from the weighed mass.
ゲル分率[%]=(M2/M1)×100 Next, the pressure-sensitive adhesive layer wrapped in the polyester mesh was immersed in ethyl acetate at room temperature (23° C.) for 72 hours, and a sample was taken out (hereinafter, the taken out sample is referred to as a “sample after immersion”. ). The immersed sample was air-dried for 24 hours in an environment of a temperature of 23°C and a relative humidity of 50%, and further dried in an oven at 120°C for 4 hours, after which the mass was weighed using a precision balance. By subtracting the mass of the mesh alone from the weighed mass, the mass M2 of only the sample after immersion was calculated. From the mass M1 and mass M2, the gel fraction was determined according to the following formula.
Gel fraction [%] = (M2/M1) x 100
実施例及び比較例で得た積層体からセパレータを剥離して露出した第2粘着剤層に、表示素子(背面層)を想定した厚み100μmのポリエチレンテレフタレート(PET)フィルムを貼合して試験片100を得た。この試験片100を用いて、以下のように高温屈曲性試験を行った。図3(a)及び(b)は、高温屈曲性試験の方法を模式的に示す図である。2つのステージ501、502を備えた屈曲装置(Science Town社製、STS-VRT-500)を準備した。ステージ501、502の上に試験片100を、背面層側が上向きになるように載せた(図3(a))。2つのステージ501、502を間隙C1で配置し、間隙C1の中心に幅方向の中心が位置するように試験片100を固定して配置した(図3(a))。このステージ501、502は揺動可能であり、初期は2つのステージ501、502が同一平面を構成する。2つのステージ501,502を位置P1及び位置P2を回転軸の中心として上方に90度回転させて、対向する試験片100同士の間隔C2が6mmとなるように2つのステージ501、502を閉じ(図3(b))、再びステージ501、502を開く動作を1回の屈曲と定義する。この動作を温度60℃の条件下で繰返し、試験片100の第1粘着剤層又は第2粘着剤層に、気泡又は粘着剤抜け(粘着剤の欠落)が発生するまでの屈曲回数を数えて屈曲性を評価した。評価の基準は次のとおりである。
A:屈曲回数が20万回に達しても気泡及び粘着剤抜けが発生しなかった。
B:屈曲回数が15万回以上20万回未満で気泡又は粘着剤抜けが発生した。
C:屈曲回数が10万回以上15万回未満で気泡又は粘着剤抜けが発生した。
D:屈曲回数が5万回以上10万回未満で気泡又は粘着剤抜けが発生した。
E:屈曲回数が5万回未満で気泡又は粘着剤抜けが発生した。 [High temperature flexibility test]
A polyethylene terephthalate (PET) film having a thickness of 100 μm assuming a display element (back layer) was laminated to the second adhesive layer exposed by peeling the separator from the laminate obtained in Examples and Comparative Examples, and a test piece was prepared.
A: Bubbles and pressure-sensitive adhesive did not come off even when the number of times of bending reached 200,000.
B: Air bubbles or pressure-sensitive adhesive coming off occurred when the number of bends was 150,000 times or more and less than 200,000 times.
C: Air bubbles or pressure-sensitive adhesive coming off occurred when the number of bends was 100,000 or more and less than 150,000.
D: Air bubbles or pressure-sensitive adhesive coming off occurred when the number of times of bending was 50,000 times or more and less than 100,000 times.
E: Air bubbles or pressure-sensitive adhesive coming off occurred when the number of bending times was less than 50,000.
屈曲の動作を行う際の温度条件を25℃に変更したこと以外は、高温屈曲性試験と同じ手順で屈曲性を評価した。評価の基準は、次のとおりである。
a:屈曲回数が20万回に達しても気泡及び粘着剤抜けが発生しなかった。
b:屈曲回数が10万回以上20万回未満で気泡又は粘着剤抜けが発生した。
c:屈曲回数が10万回未満で気泡又は粘着剤抜けが発生した。 [Room temperature flexibility test]
Flexibility was evaluated in the same procedure as the high-temperature flexibility test, except that the temperature condition during the bending motion was changed to 25°C. Evaluation criteria are as follows.
a: Bubbles and pressure-sensitive adhesive did not come off even when the number of bending reached 200,000 times.
b: Bubbles or pressure-sensitive adhesive came off when the number of bends was 100,000 or more and less than 200,000.
c: Air bubbles or pressure-sensitive adhesive coming off occurred when the number of times of bending was less than 100,000.
実施例及び比較例で作製した積層体を幅100mm×長さ100mmに切り出した後、セパレータを剥離して露出した第2粘着剤層に無アルカリガラスを貼合したサンプルを作製した。このサンプルを、オートクレーブ(温度50℃、5気圧)中で約20分間圧着処理し、恒温恒湿条件(温度23℃、相対湿度50%RH)で4時間保持した。その後、温度60℃のオーブンにサンプルを入れて250時間保持した後、サンプルを目視して、浮き、剥がれ、気泡の有無を判断した。
x:浮き、剥れ、発泡等の外観変化がほとんどみられない。
y:浮き、剥れ、発泡等の外観変化がやや目立つ。
z:浮き、剥れ、発泡等の外観変化が顕著に認められる。 [High temperature durability test]
After cutting the laminates prepared in Examples and Comparative Examples into 100 mm width×100 mm length, samples were prepared by laminating non-alkali glass to the exposed second pressure-sensitive adhesive layer by peeling off the separator. This sample was pressure-bonded for about 20 minutes in an autoclave (50° C., 5 atm) and held for 4 hours under constant temperature and humidity conditions (23° C., 50% RH). After that, the sample was placed in an oven at a temperature of 60° C. and held for 250 hours.
x: Virtually no change in appearance such as lifting, peeling, or foaming is observed.
y: Appearance changes such as lifting, peeling, and foaming are slightly conspicuous.
z: Appearance changes such as lifting, peeling, and foaming are observed remarkably.
窒素ガスが還流して温度調節が容易になるように、冷却装置を設置した1Lの反応器に、表1に示すモノマー成分を、表1に示す配合量で混合した混合物を投入した。酸素を除去するため、反応器内に窒素ガスを1時間還流した後、混合物を60℃に維持した。混合物を均一に混合した後、表1に示す光重合開始剤を、表1に示す配合量で投入し、撹拌しながらUVランプ(10mW)を照射して、(メタ)アクリル系ポリマーA1~A8を得た。表1に示す配合量は、モノマー成分及び光重合開始剤の合計質量に対する質量割合を示す。得られた(メタ)アクリル系ポリマーA1~A8の重量平均分子量を次の手順で測定した。結果を表1に示す。 [Preparation of (meth)acrylic polymers A1 to A8]
A mixture obtained by mixing the monomer components shown in Table 1 in the blending amounts shown in Table 1 was charged into a 1 L reactor equipped with a cooling device so that nitrogen gas was refluxed to facilitate temperature control. After refluxing nitrogen gas in the reactor for 1 hour to remove oxygen, the mixture was maintained at 60°C. After uniformly mixing the mixture, the photopolymerization initiator shown in Table 1 is added in the amount shown in Table 1, and irradiated with a UV lamp (10 mW) while stirring to form (meth)acrylic polymers A1 to A8. got The blending amount shown in Table 1 indicates the mass ratio with respect to the total mass of the monomer component and the photopolymerization initiator. The weight average molecular weights of the obtained (meth)acrylic polymers A1 to A8 were measured by the following procedure. Table 1 shows the results.
(メタ)アクリル系ポリマーの重量平均分子量Mwは、GPC装置にカラムとして、東ソー(株)製の「TSK gel XL」を4本、及び昭和電工(株)製の「Shodex GPC KF-802」を1本の計5本を直列につないで配置し、溶離液としてテトラヒドロフランを用い、試料濃度5mg/mL、試料導入量100μL、温度40℃、流速1mL/分の条件で、標準ポリスチレン換算により測定した。GPCの排出曲線を得る際の条件もこれと同様にした。 (Measurement of weight average molecular weight (Mw))
The weight average molecular weight Mw of the (meth)acrylic polymer was measured by using four columns of "TSK gel XL" manufactured by Tosoh Corporation and "Shodex GPC KF-802" manufactured by Showa Denko Co., Ltd. as columns in the GPC apparatus. A total of 5 tubes were connected in series, and tetrahydrofuran was used as the eluent, the sample concentration was 5 mg/mL, the sample introduction amount was 100 μL, the temperature was 40° C., and the flow rate was 1 mL/min. . The conditions for obtaining the GPC emission curve were the same.
窒素ガスが還流して温度調節が容易になるように、冷却装置を設置した1Lの反応器に、表1に示すモノマー成分を、表1に示す配合量で混合した混合物を投入した。酸素を除去するため、反応器内に窒素ガスを1時間還流した後、80℃に維持した。上記混合物を均一に混合した後、表1に示す光重合開始剤を、表1に示す配合量で投入し、撹拌しながらUVランプ(10mW)を照射して、(メタ)アクリル系ポリマーA9及びA10を得た。表1に示す配合量は、モノマー成分及び光重合開始剤の合計質量に対する質量割合を示す。得られた(メタ)アクリル系ポリマーA9及びA10の重量平均分子量を上記した手順で測定した。結果を表1に示す。 [Preparation of (meth)acrylic polymers A9 and A10]
A mixture obtained by mixing the monomer components shown in Table 1 in the blending amounts shown in Table 1 was charged into a 1 L reactor equipped with a cooling device so that nitrogen gas was refluxed to facilitate temperature control. To remove oxygen, nitrogen gas was refluxed in the reactor for 1 hour and then maintained at 80°C. After uniformly mixing the above mixture, the photopolymerization initiator shown in Table 1 was added in the amount shown in Table 1, and irradiated with a UV lamp (10 mW) while stirring, (meth)acrylic polymer A9 and A10 was obtained. The blending amount shown in Table 1 indicates the mass ratio with respect to the total mass of the monomer component and the photopolymerization initiator. The weight average molecular weights of the obtained (meth)acrylic polymers A9 and A10 were measured according to the procedure described above. Table 1 shows the results.
TDA:アクリル酸トリデシル(ガラス転移温度:-55℃)
IDA:アクリル酸イソデシル(ガラス転移温度:-60℃)
EOEOEA:アクリル酸エトキシエトキシエチル(ガラス転移温度:-56℃)
CA:アクリル酸カプロラクトン(ガラス転移温度:-40℃)
2-EHA:アクリル酸2-エチルヘキシル(ガラス転移温度:-70℃)
BA:アクリル酸n-ブチル(ガラス転移温度:-55℃)
2-HEA:アクリル酸2-ヒドロキシエチル(ガラス転移温度:-15℃)
LA:アクリル酸ラウリル(ガラス転移温度:15℃)
DCA:アクリル酸ドコシル
MMA:メタクリル酸メチル(ガラス転移温度:105℃)
I-651:ベンジルジメチルケタール
I-184:1-ヒドロキシシクロヘキシルフェニルケトン Each abbreviation in Table 1 is as follows.
TDA: tridecyl acrylate (glass transition temperature: -55°C)
IDA: isodecyl acrylate (glass transition temperature: -60°C)
EOEOEA: ethoxyethoxyethyl acrylate (glass transition temperature: -56°C)
CA: caprolactone acrylate (glass transition temperature: -40°C)
2-EHA: 2-ethylhexyl acrylate (glass transition temperature: -70°C)
BA: n-butyl acrylate (glass transition temperature: -55 ° C.)
2-HEA: 2-hydroxyethyl acrylate (glass transition temperature: -15 ° C.)
LA: Lauryl acrylate (glass transition temperature: 15°C)
DCA: docosyl acrylate MMA: methyl methacrylate (glass transition temperature: 105°C)
I-651: benzyl dimethyl ketal I-184: 1-hydroxycyclohexyl phenyl ketone
表2に示すアクリル系ポリマー、化合物、及び重合開始剤を、表2に示す配合量で混合し、粘着剤組成物B1~B10を得た。 [Preparation of adhesive compositions B1 to B10]
The acrylic polymers, compounds, and polymerization initiators shown in Table 2 were mixed in the amounts shown in Table 2 to obtain PSA compositions B1 to B10.
セパレータA(シリコーン化合物を含む離型剤をコーティングしたポリエチレンテレフタレートフィルム、厚み38μm)の離型処理面に、厚みが25μmとなるように、表3に示す粘着剤組成物を塗布した。塗布層上に、セパレータB(シリコーン化合物を含む離型剤をコーティングしたポリエチレンテレフタレートフィルム、厚み38μm)を、離型処理面側が塗布層側となるように積層した後、UV照射を行って、セパレータA/粘着剤層/セパレータBの層構造を有する粘着シート(1)~(10)を得た。UV照射は、積算光量が400mJ/cm2、照度が1.8mW/cm2(UVV基準)となるように行った。得られた粘着シート(1)~(10)の粘着剤層について、厚み温度60℃でのtanδ及び貯蔵弾性率G’、厚み、ガラス転移温度Tg、ゲル分率を測定した。結果を表3に示す。 [Production of adhesive sheets (1) to (10)]
The pressure-sensitive adhesive composition shown in Table 3 was applied to the release-treated surface of Separator A (polyethylene terephthalate film coated with a release agent containing a silicone compound,
(前面板の準備)
前面層として、樹脂フィルム(ポリイミド系樹脂フィルム、厚み40μm)の一方の面に、ハードコート層(厚み10μm)が形成された前面板を準備した。ハードコート層は、末端に多官能アクリル基を有するデンドリマー化合物を含む組成物から形成された層であった。 [Examples 1 to 10, Comparative Examples 1 and 2]
(Preparing the front plate)
As a front layer, a front plate was prepared by forming a hard coat layer (10 μm thick) on one side of a resin film (polyimide resin film, thickness 40 μm). The hard coat layer was a layer formed from a composition containing a dendrimer compound having a polyfunctional acrylic group at its end.
保護フィルム(シクロオレフィン系樹脂フィルム、厚み18μm)と直線偏光層(厚み8μm)とを水系接着剤を用いて貼合し、保護フィルム/接着剤層/直線偏光層の層構造を有する直線偏光板を得た。 (Preparation of circularly polarizing plate)
A linear polarizing plate having a layer structure of protective film/adhesive layer/linear polarizing layer, obtained by laminating a protective film (cycloolefin resin film, thickness 18 μm) and a linear polarizing layer (thickness 8 μm) using a water-based adhesive. got
上記で得た前面層の樹脂フィルム側と、円偏光板の直線偏光板側とを、表4及び表5に示す第1粘着剤層を用いて貼合し、円偏光板の位相差積層体側に表4及び表5に示す第2粘着剤層及びセパレータを積層して、積層体(1)~(12)を作製した。積層体(1)~(12)の層構造は、前面層(ハードコート層/樹脂フィルム)/第1粘着剤層/直線偏光板(保護フィルム/接着剤層/直線偏光層)/位相差積層体(第1位相差層/接着剤層/第2位相差層)/第2粘着剤層/セパレータであった。 (Preparation of laminate)
The resin film side of the front layer obtained above and the linear polarizing plate side of the circular polarizing plate are bonded using the first adhesive layer shown in Tables 4 and 5, and the retardation laminate side of the circular polarizing plate A second pressure-sensitive adhesive layer and a separator shown in Tables 4 and 5 were laminated on the above to prepare laminates (1) to (12). The layer structure of laminates (1) to (12) is front layer (hard coat layer/resin film)/first adhesive layer/linear polarizing plate (protective film/adhesive layer/linear polarizing layer)/retardation laminate. It was a body (first retardation layer/adhesive layer/second retardation layer)/second pressure-sensitive adhesive layer/separator.
ステージ。 1,2 laminate, 11 front layer, 15 back layer, 21 first adhesive layer, 22 second adhesive layer, 30 polarizing plate, 31 linear polarizing layer, 32 protective film, 33 first retardation layer (retardation layer), 34 second retardation layer, 37, 38 bonding layer, 100 test piece, 501, 502
stage.
Claims (11)
- 前面層、第1粘着剤層、少なくとも直線偏光層を含む偏光板、第2粘着剤層、及び背面層をこの順に有し、
前記第1粘着剤層の温度60℃におけるtanδをD1とし、前記第2粘着剤層の温度60℃におけるtanδをD2とするとき、下記式(1)及び式(2)の関係を満たす、積層体。
D1<D2 (1)
0.2≦D2≦1.0 (2) Having a front layer, a first adhesive layer, a polarizing plate including at least a linear polarizing layer, a second adhesive layer, and a back layer in this order,
When tan δ at a temperature of 60 ° C. of the first pressure-sensitive adhesive layer is D1 and tan δ at a temperature of 60 ° C. of the second pressure-sensitive adhesive layer is D2, the relationship of the following formulas (1) and (2) is satisfied. body.
D1<D2 (1)
0.2≤D2≤1.0 (2) - 前記第2粘着剤層の厚みは、15μm以上50μm以下である、請求項1に記載の積層体。 The laminate according to claim 1, wherein the thickness of the second pressure-sensitive adhesive layer is 15 µm or more and 50 µm or less.
- 前記第2粘着剤層のガラス転移温度は、-55℃以下である、請求項1又は2に記載の積層体。 The laminate according to claim 1 or 2, wherein the second pressure-sensitive adhesive layer has a glass transition temperature of -55°C or lower.
- 前記第2粘着剤層のゲル分率は、45%以上85%以下である、請求項1~3のいずれか1項に記載の積層体。 The laminate according to any one of claims 1 to 3, wherein the second pressure-sensitive adhesive layer has a gel fraction of 45% or more and 85% or less.
- 前記第2粘着剤層は、(メタ)アクリル系ポリマーを含む粘着剤組成物から形成され、
前記(メタ)アクリル系ポリマーは、炭素数が1以上24以下のアルキル基を有する(メタ)アクリル酸アルキルエステルに由来する構成単位を含む、請求項1~4のいずれか1項に記載の積層体。 The second pressure-sensitive adhesive layer is formed from a pressure-sensitive adhesive composition containing a (meth) acrylic polymer,
The (meth)acrylic polymer comprises a structural unit derived from a (meth)acrylic acid alkyl ester having an alkyl group having 1 to 24 carbon atoms, the laminate according to any one of claims 1 to 4. body. - 前記(メタ)アクリル系ポリマーは、炭素数が20以上24以下のアルキル基を有する(メタ)アクリル酸アルキルエステルに由来する構成単位を含む、請求項5に記載の積層体。 The laminate according to claim 5, wherein the (meth)acrylic polymer contains a structural unit derived from a (meth)acrylic acid alkyl ester having an alkyl group having 20 to 24 carbon atoms.
- 前記(メタ)アクリル系ポリマーを構成する全構成単位に対する反応性官能基を有するモノマーに由来する構成単位の含有量は、2質量%以下である、請求項5又は6に記載の積層体。 The laminate according to claim 5 or 6, wherein the content of structural units derived from a monomer having a reactive functional group with respect to all structural units constituting the (meth)acrylic polymer is 2% by mass or less.
- 前記偏光板は、前記前面層側から順に、前記直線偏光層及び位相差層を有する円偏光板である、請求項1~7のいずれか1項に記載の積層体。 The laminate according to any one of claims 1 to 7, wherein the polarizing plate is a circularly polarizing plate having the linear polarizing layer and the retardation layer in order from the front layer side.
- 前記背面層は、前記第2粘着剤層側から順に、離型処理層及び基材層を有するセパレータである、請求項1~8のいずれか1項に記載の積層体。 The laminate according to any one of claims 1 to 8, wherein the back layer is a separator having a release treatment layer and a substrate layer in order from the second pressure-sensitive adhesive layer side.
- 請求項1~8のいずれか1項に記載の積層体を含む、表示装置。 A display device comprising the laminate according to any one of claims 1 to 8.
- 前記背面層が内側となるように屈曲可能である、請求項10に記載の表示装置。 11. The display device according to claim 10, wherein the back layer is bendable to the inside.
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JP2021061139A (en) * | 2019-10-04 | 2021-04-15 | 日東電工株式会社 | Display device and substrate layered body |
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