WO2015146664A1 - 両面粘着シートおよび光学部材 - Google Patents
両面粘着シートおよび光学部材 Download PDFInfo
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- WO2015146664A1 WO2015146664A1 PCT/JP2015/057654 JP2015057654W WO2015146664A1 WO 2015146664 A1 WO2015146664 A1 WO 2015146664A1 JP 2015057654 W JP2015057654 W JP 2015057654W WO 2015146664 A1 WO2015146664 A1 WO 2015146664A1
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- sensitive adhesive
- double
- adhesive sheet
- pressure
- sided pressure
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D133/00—Coating compositions 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; Coating compositions based on derivatives of such polymers
- C09D133/04—Homopolymers or copolymers of esters
- C09D133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09D133/062—Copolymers with monomers not covered by C09D133/06
- C09D133/066—Copolymers with monomers not covered by C09D133/06 containing -OH groups
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/28—Metal sheet
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J11/00—Recovery or working-up of waste materials
- C08J11/04—Recovery or working-up of waste materials of polymers
- C08J11/06—Recovery or working-up of waste materials of polymers without chemical reactions
- C08J11/08—Recovery or working-up of waste materials of polymers without chemical reactions using selective solvents for polymer components
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
- C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09J133/062—Copolymers with monomers not covered by C09J133/06
- C09J133/066—Copolymers with monomers not covered by C09J133/06 containing -OH groups
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/29—Laminated material
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/40—Adhesives in the form of films or foils characterised by release liners
- C09J7/405—Adhesives in the form of films or foils characterised by release liners characterised by the substrate of the release liner
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/11—Anti-reflection coatings
- G02B1/111—Anti-reflection coatings using layers comprising organic materials
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/005—Additives being defined by their particle size in general
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
- C09J2301/408—Additional features of adhesives in the form of films or foils characterized by the presence of essential components additives as essential feature of the adhesive layer
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2433/00—Presence of (meth)acrylic polymer
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2202/00—Materials and properties
- G02F2202/28—Adhesive materials or arrangements
Definitions
- the present invention relates to a double-sided pressure-sensitive adhesive sheet used for bonding a conductive member provided with a conductive part on a transparent support and a cover glass, a display device, or the like. Moreover, it is related with the optical member which bonded the double-sided adhesive sheet to the electrically-conductive member.
- Patent Document 1 proposes a pressure-sensitive adhesive sheet for sticking to a metal surface that does not corrode the metal surface, can be easily peeled off from the metal surface during rework, and has good transparency.
- the conductive member generally has a structure in which ITO or the like is patterned on a transparent support.
- the adhesive sheet described in Patent Document 1 is bonded to such a conductive member, there is a problem that the pattern of the conductive part is visualized although the conductive part does not corrode.
- the adhesive sheet not only prevents the visualization of the pattern of the conductive part, but also needs to maintain good visibility of the screen when used for bonding the conductive member and the display device. is not.
- the present invention When the present invention is applied to a conductive member provided with a conductive part on a part of a transparent support, the pattern of the conductive part is made invisible while maintaining a sufficient adhesive force, and the conductive member and the display device It aims at providing the optical member provided with the double-sided adhesive sheet with favorable visibility of a screen, and the double-sided adhesive sheet when used for bonding.
- the present inventors have found that the haze of the double-sided PSA sheet is more than 10% and less than 20%, which is sufficient when applied to a conductive member. It has been found that a double-sided pressure-sensitive adhesive sheet can be realized when the conductive part pattern is made invisible while maintaining the adhesive force, and when the conductive member and the display device are bonded to each other, and the visibility of the screen is good.
- the present invention has the following configuration. [1] A double-sided pressure-sensitive adhesive sheet for bonding a conductive member provided with a conductive part on a part of a transparent support, wherein the haze is more than 10% and less than 20%.
- Double-sided adhesive sheet. [5] The double-sided pressure-sensitive adhesive sheet according to [3] or [4], wherein the light-diffusing fine particles (C) have an average particle size of 0.1 to 20 ⁇ m.
- a double-sided pressure-sensitive adhesive sheet with a release sheet wherein the double-sided pressure-sensitive adhesive sheet according to any one of [1] to [7] is laminated with release sheets having different peelability on each side.
- a conductive member provided with a conductive portion on a part of a transparent support, and transparent with one adhesive surface of the double-sided pressure-sensitive adhesive sheet according to any one of [1] to [7] A pressure-sensitive adhesive sheet with a transparent substrate comprising a laminated structure in contact with the substrate layer.
- a double-sided pressure-sensitive adhesive sheet according to any one of [1] to [7], a transparent base material layer, and a hard material, for bonding a conductive member having a conductive portion provided on a part of a transparent support.
- a conductive member provided with a conductive part on a part of a transparent support is provided with at least a part of the conductive part on one adhesive surface of the double-sided pressure-sensitive adhesive sheet according to any one of [1] to [7].
- An optical member bonded so as to be in contact.
- the pattern of the conductive part when applied to a conductive member provided with a conductive part on a part of a transparent support, the pattern of the conductive part is made invisible while maintaining a sufficient adhesive force, and is displayed as a conductive member.
- a double-sided pressure-sensitive adhesive sheet having good screen visibility when used for bonding devices can be realized.
- the electroconductive part is invisible and an optical member with favorable visibility of a screen can be obtained when bonding with a display apparatus.
- a numerical range expressed using “to” means a range including numerical values described before and after “to” as a lower limit value and an upper limit value.
- Double-sided pressure-sensitive adhesive sheet The double-sided pressure-sensitive adhesive sheet of the present invention is used for bonding a conductive member provided with a conductive part on a part of a transparent support, and has a haze of more than 10% and less than 20%.
- haze refers to a value measured by a method in accordance with JIS K7136. This haze value is only a double-sided pressure-sensitive adhesive sheet (in the absence of a release sheet) in the case of the shape of a double-sided pressure-sensitive adhesive sheet. Since it is difficult to measure the haze value of), it is pasted on a slide glass (product number: S9112) manufactured by Matsunami Glass Co., Ltd.
- a transparent film pressure-sensitive adhesive sheet having a transparent base material layer the haze in the laminate of the transparent base material layer, the double-sided pressure-sensitive adhesive sheet and the glass bonded to the glass and the transparent film pressure-sensitive adhesive sheet Value.
- the double-sided pressure-sensitive adhesive sheet having the haze in the above range is bonded to the conductive member so as to be in contact with the conductive part, the light incident on the double-sided pressure-sensitive adhesive sheet is appropriately diffused due to the haze exceeding 10%, and the electrode part The pattern becomes difficult to see from the outside.
- a double-sided adhesive sheet has high transparency because haze is less than 20%.
- the display screen of a display apparatus can be visually recognized clearly by the transparent support body side of a conductive member.
- the haze of the double-sided pressure-sensitive adhesive sheet can be easily adjusted while ensuring the adhesive strength, for example, by a method of mixing an appropriate amount of the light diffusing fine particles (C). Therefore, by defining the haze in the above range, when applied to a conductive member, when the pattern of the conductive part is made invisible while maintaining sufficient adhesive force, and used for bonding the conductive member and the display device
- a double-sided pressure-sensitive adhesive sheet with good screen visibility can be realized.
- the preferable haze range of the double-sided PSA sheet is 12 to 18%, and a more preferable range is 14 to 16%.
- the pressure-sensitive adhesive composition that forms the double-sided pressure-sensitive adhesive sheet of the present invention preferably has transparency that does not reduce visibility, and the base polymer of the pressure-sensitive adhesive composition is preferably an acrylic polymer (A). Thereby, the double-sided adhesive sheet excellent in adhesiveness can be obtained.
- acrylic polymer (A) As the acrylic polymer (A), a co-polymer containing a non-crosslinkable (meth) acrylic acid ester unit (a1) as a main component and an acrylic monomer unit (a2) having a crosslinkable functional group therein. It is preferable to use coalescence.
- the “unit” is a repeating unit (monomer unit) constituting the polymer.
- the acrylic monomer unit (a2) having a crosslinkable functional group serves as a reaction point when the crosslinker (B) is used, and the adhesive force, cohesive force, and heat resistance can be controlled by crosslinking.
- the amount of the acrylic monomer unit (a2) having a crosslinkable functional group in the acrylic polymer (A) is 0.01 to 20% by mass as a proportion of the total monomer mass constituting the copolymer. It is preferable that More preferred is 0.1 to 15% by mass, and further preferred is 0.5 to 10% by mass. If the content of the crosslinkable acrylic monomer unit (a2) is not less than the lower limit of the above range, it has sufficient crosslinkability, and if it is not more than the upper limit of the above range, necessary adhesive properties can be maintained. .
- non-crosslinkable (meth) acrylic acid ester unit (a1) constituting the acrylic polymer (A) for example, methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) ) Acrylate, isobutyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, octyl (meth) acrylate, isooctyl (meth) acrylate, isononyl (meth) acrylate, lauryl (meth) acrylate, isostearyl (meth) acrylate, etc.
- (meth) acrylic-acid alkylester monomer may use 2 or more types together as needed.
- (meth) acrylate means containing both “acrylate” and “methacrylate”
- (meth) acrylic acid means “acrylic acid” and “methacrylic acid”. Is meant to include both.
- examples of the acrylic monomer unit (a2) having a crosslinkable functional group include a carboxyl group-containing monomer such as (meth) acrylic acid, maleic acid, maleic anhydride, itaconic acid, fumaric acid, and fumaric anhydride.
- Hydroxyl group-containing monomers such as hydroxyethyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, polyethylene glycol (meth) acrylate, (meth) acrylamide, morpholyacrylamide,
- Examples include amino group-containing (meth) acrylic esters such as N, N-dimethylaminoethyl acrylate and N-tert-butylaminoethyl acrylate, and epoxy groups such as glycidyl (meth) acrylate. You may use the above together.
- the electroconductive part of the electroconductive member which bonds the double-sided adhesive sheet of this invention is ITO
- the monomer which has functional groups other than a carboxyl group-containing monomer it is preferable to use the monomer which has functional groups other than a carboxyl group-containing monomer, and has a crosslinkable functional group.
- the proportion of the carboxyl group-containing monomer unit contained in the acrylic monomer unit (a2) is preferably 1% or less with respect to the total mass of the acrylic monomer unit (a2), 0.1% The following is more preferable, and 0% is particularly preferable.
- the acrylic polymer (A) is a monomer unit other than the non-crosslinkable (meth) acrylic acid ester unit (a1) and the acrylic monomer unit (a2) having a crosslinkable functional group. You may have.
- the other monomer is not particularly limited as long as it is copolymerizable with a non-crosslinkable (meth) acrylic acid ester and an acrylic monomer having a crosslinkable functional group.
- the content of other monomer units in the acrylic polymer (A) is preferably 0 to 20% by mass, and more preferably 0 to 15% by mass.
- the weight average molecular weight of the acrylic polymer (A) is preferably 100,000 to 2,000,000, more preferably 300,000 to 1,500,000. Sufficient durability can be secured when the weight average molecular weight is not less than the above lower limit value, and sufficient unevenness followability can be secured unless the upper limit value is exceeded.
- the weight average molecular weight of an acrylic polymer (A) is a value before bridge
- the weight average molecular weight is a value determined by size exclusion chromatography (SEC) and determined on a polystyrene basis.
- a solution polymerization method When polymerizing the pressure-sensitive adhesive, for example, a solution polymerization method can be applied.
- the solution polymerization method include an ionic polymerization method and a radical polymerization method.
- the solvent used at that time include tetrahydrofuran, chloroform, ethyl acetate, toluene, hexane, acetone, methyl ethyl ketone, and the like.
- Crosslinking agent (B) When the pressure-sensitive adhesive composition used in the present invention is a copolymer using a monomer having a functional group, the pressure-sensitive adhesive can be subjected to a crosslinking treatment by blending a crosslinking agent (B).
- the crosslinking agent (B) include isocyanate compounds, epoxy compounds, oxazoline compounds, aziridine compounds, metal chelate compounds, butylated melamine compounds, and these may be used in combination of two or more as required. It is preferable to select in consideration of the reactivity with the functional group used in the acrylic polymer (A).
- an isocyanate compound and an epoxy compound are preferable because the acrylic polymer (A) can be easily crosslinked.
- the isocyanate compound include tolylene diisocyanate, xylylene diisocyanate, hexamethylene diisocyanate, and isophorone diisocyanate.
- the epoxy compound include ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, glycerin diglycidyl ether, neopentyl glycol diglycidyl ether, and 1,6-hexanediol diester.
- Glycidyl ether tetraglycidyl xylenediamine, 1,3-bis (N, N-diglycidylaminomethyl) cyclohexane, trimethylolpropane polyglycidyl ether, diglycerol polyglycidyl ether, polyglycerol polyglycidyl ether, sorbitol polyglycidyl ether, etc. Can be mentioned.
- the content of the crosslinking agent (B) is appropriately selected according to the desired pressure-sensitive physical properties and the like, and is not particularly limited, but is 0.01% with respect to 100 parts by mass of the acrylic polymer (A). To 5 parts by mass is preferable, and 0.03 to 3 parts by mass is more preferable. If the content of the crosslinking agent (B) is not less than the above lower limit value, the durability is excellent, and if the content is not more than the above upper limit value, the adhesion to the adherend is excellent. Further, the content of the crosslinking agent (B) is preferably 0.01 to 5.0% by mass, and preferably 0.02 to 2.0% by mass with respect to the total mass of the pressure-sensitive adhesive composition. More preferred.
- the gel fraction of the crosslinked pressure-sensitive adhesive composition crosslinked by the above is 20 to 98%, preferably 30 to 90%, more preferably 40 to 80%. If the gel fraction is 20% or more, sufficient cohesive force can be obtained, and if it is 98% or less, sufficient adhesive force and wettability to the adherend can be obtained.
- the gel fraction described here is that a predetermined amount of the pressure-sensitive adhesive composition is immersed in a solvent such as ethyl acetate or toluene that is twice or more the mass of the pressure-sensitive adhesive composition. It is a percentage display of the value which divided by the mass of the adhesive composition before immersion after processing for 24 hours at 0 degreeC, and filtering with the 150 mesh wire mesh, and removing the soluble content.
- the light-diffusing fine particles (C) and the incompatible resin (D) are used in addition to the acrylic polymer (A) and the cross-linking agent (B), when adjusting the haze of the double-sided pressure-sensitive adhesive sheet. At least one selected is mixed.
- the light diffusing fine particles (C) and the incompatible resin (D) will be described in the section of “Adjustment of haze” described later.
- the following additives may be added to the pressure-sensitive adhesive composition.
- the ultraviolet absorber can be selected from those having a maximum absorption wavelength in the ultraviolet region, and an ultraviolet absorber having a maximum absorption wavelength at a wavelength of 350 nm or more is preferably used.
- Examples of the ultraviolet absorber having a maximum absorption wavelength at a wavelength of 350 nm or longer include compounds represented by the following general formula (1) or (2).
- R 1 represents a hydrogen atom, a halogen atom, an alkoxy group having 1 to 4 carbon atoms, a nitro group or a cyano group
- R 2 represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms
- 3 represents an alkyl group structure.
- R 4 , R 5 and R 6 are a hydrogen atom, a hydroxyl group, an alkyl group structure or a halogen atom, and all of R 4 , R 5 and R 6 are not hydrogen atoms.
- the alkyl group structure is a concept including a substituent mainly composed of an alkyl group such as a substituted or unsubstituted alkyl group or a substituted or unsubstituted alkoxy group.
- an ultraviolet absorber that improves the compatibility by introducing an alkyl group having a large molecular weight into the aromatic ring of the basic skeleton and exhibits a liquid state or an oily state at 23 ° C.
- being liquid or oily at 23 ° C. means a state in which there is fluidity only with an ultraviolet absorber even without a diluting solvent.
- the content of the ultraviolet absorber in the pressure-sensitive adhesive composition is preferably 0.5 to 8 parts by mass with respect to 100 parts by mass of the solid content (particularly acrylic polymer) of the pressure-sensitive adhesive composition. More preferred is 4 to 6 parts by mass.
- the content of the ultraviolet absorber in the pressure-sensitive adhesive composition is preferably adjusted to such an amount that the ultraviolet transmittance at 380 nm is less than 5%. If the content is 3 parts by mass or more, when the thickness of the double-sided PSA sheet is 25 ⁇ m, the transmittance with light having a wavelength of 380 nm is 2% or less.
- the light stabilizer represented by the hindered amine type compound can be illustrated preferably. It is also preferable to use an antioxidant typified by a hindered phenol compound.
- Antioxidants are generally classified into primary antioxidants called radical chain terminators and secondary antioxidants that act as peroxide decomposers. Examples of the primary antioxidant include hindered phenol antioxidants, amine antioxidants, and lactone antioxidants. Examples of secondary antioxidants include phosphorus antioxidants and sulfur antioxidants. These antioxidants may be used alone or in combination of two or more. In particular, when anti-corrosion effect of ITO is expected, it is preferable to use a primary antioxidant and a secondary antioxidant in combination because the effect is easily obtained.
- the content of these additives is preferably 0.03 to 1.5 parts by mass and more preferably 0.05 to 1.0 parts by mass with respect to 100 parts by mass of the acrylic polymer (A). preferable. If the content is not less than the above lower limit value, it is possible to reliably maintain the absorbency of ultraviolet rays when used over a long period of time in a high temperature, low temperature and wet heat environment, and if it is not more than the above upper limit value, the transmittance at 380 nm. It is possible to further prevent the rise and the deterioration of the adhesive property.
- the pressure-sensitive adhesive composition may contain additives other than the above, such as a silane coupling agent and a metal corrosion inhibitor, as necessary.
- a silane coupling agent include mercaptoalkoxysilane compounds (for example, mercapto group-substituted alkoxy oligomers).
- a metal corrosion inhibitor a type that prevents a corrosion by forming a complex with a metal and forming a film on the metal surface is preferable, and a benzotriazole-based metal corrosion inhibitor is particularly preferable.
- the adjustment of the haze of the double-sided pressure-sensitive adhesive sheet is carried out by (i) a method in which the light diffusing fine particles (C) are mixed with the pressure-sensitive adhesive composition in an amount that provides the desired haze, or (ii) an incompatible resin (D ) Is preferably performed by a method of mixing in an amount that achieves a desired haze.
- the haze of the double-sided PSA sheet is within the above range by using the light diffusing fine particles (C) as an additive mixed with the PSA composition and changing the content of the light diffusing fine particles (C) in the PSA composition. Can be adjusted.
- the light diffusing fine particles (C) may be fine particles having a function of diffusing light incident on the double-sided pressure-sensitive adhesive sheet, and may be organic fine particles or inorganic fine particles. Examples of the inorganic fine particles include fine particles made of silica, calcium carbonate, aluminum hydroxide, magnesium hydroxide, clay, talc, aluminum oxide, titanium oxide, and the like.
- organic fine particles examples include polystyrene resins, polyolefin resins such as polyethylene and polypropylene, (meth) acrylic resins such as polymethacrylate resins and polyacrylate resins, epoxy resins, silicone resins, and crosslinked resins.
- Resin particles comprising a copolymerized resin in which two or more monomers selected from the formed crosslinked polymer, ethylene, propylene, styrene, methyl methacrylate, benzoguanamine, formaldehyde, melamine, butadiene and the like are copolymerized Can be used.
- fine particles composed of a silicon-containing compound having an intermediate structure between inorganic and organic can also be used as the light diffusing fine particles (C).
- These light diffusing fine particles (C) may be used alone or in combination of two or more.
- organic fine particles, inorganic fine particles, and fine particles having an intermediate structure between inorganic and organic can be used in combination.
- the light diffusing fine particles (C) used in the present invention are preferably those that do not excessively reduce the total light transmittance of the double-sided PSA sheet, and acrylic beads and silica beads having high transparency are suitable.
- the shape of the light diffusing fine particles (C) is not particularly limited, but is preferably spherical because light can be uniformly diffused.
- the average particle size of the light diffusing fine particles (C) is preferably 0.1 to 20 ⁇ m, more preferably 0.3 to 17 ⁇ m, and further preferably 0.5 to 12 ⁇ m.
- the “average particle diameter” means the maximum length (Dmax: two points on the contour of the particle image) of the particle image of the light diffusing particle using a transmission electron microscope or a scanning electron microscope.
- the geometric mean value (Dmax ⁇ DV ⁇ max) 1/2 is used as the particle diameter, and the particle diameter is measured for any 100 light-diffusing particles by this method. If the average particle diameter of the light diffusing fine particles (C) is 20 ⁇ m or less, there is a tendency that it is difficult to feel a granular feeling or a foreign object feeling when the double-sided pressure-sensitive adhesive sheet is visually recognized, and if the average particle diameter is 0.1 ⁇ m or more. The haze of the double-sided PSA sheet tends to be easily adjusted to a desired value.
- the content of the light diffusing fine particles (C) in the pressure-sensitive adhesive composition is preferably 1 to 15 parts by mass with respect to 100 parts by mass of the acrylic polymer (A). If the content of the light diffusing fine particles (C) in the pressure-sensitive adhesive composition is 15 parts by mass or less, it tends to suppress a decrease in the total light transmittance, and if it is 1 part by mass or more, it tends to be adjusted to a desired haze. There is.
- the haze of the double-sided pressure-sensitive adhesive sheet is obtained by using the incompatible resin (D) as an additive mixed with the pressure-sensitive adhesive composition and changing the type and content of the incompatible resin (D) in the pressure-sensitive adhesive composition.
- the incompatible resin refers to a resin having low compatibility with the acrylic polymer (A) of the base polymer.
- the acrylic polymer (A) and the incompatible resin are mixed, the one in which the haze increases according to the mixing amount is referred to as the incompatible resin.
- a resin having a haze of 20% or more when an acrylic copolymer and a resin are mixed at 1: 1 is referred to as an incompatible resin. If such an incompatible resin is used, it becomes possible to control the haze within the range of 10 to 20% which is the haze range of the present invention.
- the incompatible resin examples include a tackifier and a styrene copolymer resin.
- the tackifier include rosin resins, terpene resins, terpene phenol resins, coumarone indene resins, styrene resins, xylene resins, phenol resins, petroleum resins, and the like.
- the tackifier is preferably a terpene resin, more preferably an aromatic modified terpene resin, and further preferably an aromatic modified hydrogenated terpene resin.
- aromatic modified hydrogenated terpene resin tackifier (Yasuhara Chemical, K100) or the like can be used.
- the content of the incompatible resin (D) in the pressure-sensitive adhesive composition is preferably 1 to 50 parts by mass and preferably 2 to 30 parts by mass with respect to 100 parts by mass of the acrylic polymer (A).
- the amount is more preferably 3 to 25 parts by mass, further preferably 5 to 20 parts by mass, and most preferably 8 to 15 parts by mass.
- the content varies depending on the type of incompatible resin to be added. For example, when an aromatic modified hydrogenated terpene resin or a styrene-acrylic copolymer is used as the incompatible resin (D). Is preferably within the above range. By making content of incompatible resin (D) into the said range, the fall of a total light transmittance can be suppressed and it becomes easy to adjust to desired haze.
- the haze of the double-sided PSA sheet can be adjusted by using another PSA having a different composition, molecular weight, and glass transition temperature (Tg) from the main PSA composition.
- resins include acrylic pressure-sensitive adhesive compositions, urethane-based pressure-sensitive adhesive compositions, polyester-based pressure-sensitive adhesive compositions, rubber-based pressure-sensitive adhesive compositions, and silicone-based pressure-sensitive adhesive compositions having different main compositions.
- the double-sided pressure-sensitive adhesive sheet of the present invention is obtained, for example, by applying a pressure-sensitive adhesive composition on a release sheet to form a coating film, and heating the coating film to obtain a cured product.
- the release sheet is a sheet having releasability on at least one side.
- a release sheet a peelable laminate sheet having a release sheet substrate and a release agent layer provided on one side of the release sheet substrate, or a polyolefin film such as a polyethylene film or a polypropylene film as a low polarity substrate Is mentioned. Papers and polymer films are used as the release sheet substrate in the peelable laminate sheet.
- the release agent constituting the release agent layer for example, a general-purpose addition type or condensation type silicone release agent or a long-chain alkyl group-containing compound is used.
- an addition type silicone release agent having high reactivity is preferably used.
- Specific examples of silicone release agents include BY24-4527 and SD-7220 manufactured by Toray Dow Corning Silicone, KS-3600, KS-774, and X62-2600 manufactured by Shin-Etsu Chemical Co., Ltd. Is mentioned.
- the silicone release agent may contain a silicone resin which is an organosilicon compound having a SiO 2 unit and a (CH 3 ) 3 SiO 1/2 unit or CH 2 ⁇ CH (CH 3 ) SiO 1/2 unit. preferable.
- silicone resin examples include BY24-843, SD-7292, SHR-1404 manufactured by Toray Dow Corning Silicone, KS-3800, X92-183 manufactured by Shin-Etsu Chemical Co., Ltd., and the like.
- one release sheet and the other release sheet have different peelability. That is, when the peelability from one side and the peelability from the other are different, it becomes easy to peel only the release sheet having the higher peelability first. In that case, what is necessary is just to adjust the peelability of one peeling sheet and the other peeling sheet according to the bonding method and the bonding order.
- the application of the pressure-sensitive adhesive composition forming the double-sided pressure-sensitive adhesive sheet can be carried out using a known coating apparatus.
- the coating apparatus include a blade coater, an air knife coater, a roll coater, a bar coater, a gravure coater, a micro gravure coater, a rod blade coater, a lip coater, a die coater, and a curtain coater.
- the coating liquid contains a solvent.
- the solvent examples include methanol, ethanol, isopropanol, acetone, methyl ethyl ketone, toluene, n-hexane, n-butyl alcohol, methyl isobutyl ketone, methyl butyl ketone, ethyl butyl ketone, cyclohexanone, ethyl acetate, butyl acetate, propylene glycol monomethyl.
- Ether acetate, ethylene glycol monoethyl ether, propylene glycol monomethyl ether, N-methyl-2-pyrrolidone and the like are used. These may be used alone or in combination of two or more.
- the coating film can be heated using a known heating device such as a heating furnace or an infrared lamp.
- the thickness of the double-sided PSA sheet is preferably 10 to 200 ⁇ m, more preferably 20 to 100 ⁇ m.
- the thickness of the double-sided pressure-sensitive adhesive sheet is 10 ⁇ m or more, sufficient adhesive force can be secured, and even when used for a long time, floating and peeling are less likely to occur.
- the thickness of the double-sided pressure-sensitive adhesive sheet is 200 ⁇ m or less, for example, when the double-sided pressure-sensitive adhesive sheet is cut to the size of the display device, troubles such as an increase in the defective rate due to adhesion of the adhesive to the cutting blade and the like are unlikely to occur. There are advantages.
- the pressure-sensitive adhesive sheet with a transparent substrate of the present invention is for bonding a conductive member provided with a conductive part on a part of a transparent support, and is a double-sided pressure-sensitive adhesive sheet of the present invention. And a transparent substrate layer in contact with one pressure-sensitive adhesive surface of the double-sided pressure-sensitive adhesive sheet.
- the transparent substrate layer may have a hard coat layer. When laminating a transparent base material layer and a hard coat layer, it is preferable to provide an easy adhesion layer between the transparent base material layer and the hard coat layer.
- the embodiment shown in FIG. 1 is an example of the pressure-sensitive adhesive sheet with a transparent substrate of the present invention.
- the double-sided pressure-sensitive adhesive sheet 13, the easy-adhesion layer 11b, the transparent base material layer 12, the easy-adhesion layer 11a, and the hard coat layer 10 are They are stacked in order. Below, a transparent base material layer, a hard-coat layer, and an easily bonding layer are demonstrated.
- a transparent base material layer functions as a base material which reinforces an adhesive sheet, or is utilized as a scattering prevention film for a conductive member using a glass base material, or a decorative film.
- the transparent substrate layer may be a layer having optical characteristics (such as a retardation layer). That is, it may fulfill an optical function in addition to the function as a base material for reinforcing the diffusion adhesive layer.
- a transparent base material layer is comprised from the transparent material which permeate
- transparent resin films examples include polyethylene terephthalate (PET) film, polyethylene naphthalate film, polypropylene terephthalate film, polybutylene terephthalate film, polypropylene naphthalate film, polyethylene film, polypropylene film, cellophane, diacetylcellulose film, and triacetyl.
- PET polyethylene terephthalate
- polyethylene naphthalate film polyethylene naphthalate film
- polypropylene terephthalate film polybutylene terephthalate film
- polypropylene naphthalate film polyethylene film
- polypropylene film cellophane
- diacetylcellulose film examples of transparent resin films
- Cellulose film acetylcellulose butyrate film, polyvinyl chloride film, polyvinylidene chloride film, polyvinyl alcohol film, ethylene-vinyl acetate copolymer film, polystyrene film, polycarbonate film, polymethylpentene film, polysulfone film, polyether ether ketone Film, polyethersulfone fill , Polyetherimide film, a polyimide film, a fluororesin film, a polyamide film, and acrylic resin film.
- PET polyethylene terephthalate
- the transparent substrate layer constituting the pressure-sensitive adhesive sheet with a transparent substrate of the present invention may be a single layer or a plurality of layers. When comprised from a some layer, it is good also as a transparent base material layer being comprised from a different polyester-type resin.
- the thickness of the transparent substrate layer constituting the pressure-sensitive adhesive sheet with a transparent substrate of the present invention is not particularly limited, but can be, for example, 10 ⁇ m or more, and can be selected within a range of 20 ⁇ m or more and 50 ⁇ m or more. . Although an upper limit changes with uses, it is also possible to select within the range of 1 cm or less, 1 mm or less, and 300 micrometers or less, for example.
- the haze of the transparent substrate layer constituting the pressure-sensitive adhesive sheet with a transparent substrate of the present invention is preferably 5 or less, more preferably 3 or less, and even more preferably 1 or less.
- a hard coat layer is a layer whose hardness is higher than a transparent base material layer, and has a function which prevents that the surface of an adhesive sheet with a transparent base material generate
- the hard coat layer preferably has a high hardness and transmits visible light.
- the center line average roughness defined by JIS B 0601 is preferably 1 to 20 nm, and more preferably 10 nm or less. The center line average roughness can be measured using, for example, an ultra-deep shape measuring microscope manufactured by Keyence Corporation.
- Hard coat layer is anti-reflective, anti-glare, anti-watermark as necessary (in the laminated body of touch panel module and display device, if there is a gap between them, the touch panel module and display device are in contact during touch panel operation, An error may occur in which the contacted portion appears to be wet with water, and this error may be referred to as a watermark).
- the center line average roughness defined by JIS B 0601 is preferably 20 to 500 nm, and more preferably 50 to 300 nm. The centerline average roughness can be measured using, for example, an ultra-deep shape measuring microscope manufactured by Keyence Corporation as described above.
- the hard coat layer preferably contains a hard component for imparting hardness.
- the hard component include a crosslinked polymer.
- the crosslinked polymer include a monofunctional monomer polymer and a polyfunctional monomer polymer.
- the polyfunctional monomer polymer is preferably a polymer of a polymerizable monomer containing a trifunctional or higher polyfunctional monomer, more preferably a polymer of a polymerizable monomer containing a tetrafunctional or higher polyfunctional monomer.
- a copolymer of a mixed monomer of a trifunctional or higher polyfunctional monomer and a bifunctional monomer can be preferably exemplified.
- an oligomer is also contained in the monomer here.
- an acrylic monomer etc. can be illustrated preferably.
- the hard coat layer may contain a flexible component.
- the flexible component include tricyclodecanemethylol di (meth) acrylate, ethylene oxide-modified di (meth) acrylate of bisphenol F, ethylene oxide-modified di (meth) acrylate of bisphenol A, ethylene oxide-modified di (meth) acrylate of isocyanuric acid ( Bifunctional (meth) acrylates such as (meth) acrylate, polypropylene glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, propylene oxide modified tri (meth) acrylate of trimethylpropane, trimethyl Trifunctional (meth) acrylates such as propane ethylene oxide modified tri (meth) acrylate, urethane (meth) acrylate, polyester (meth) acrylate DOO, polyether (
- the crosslinked polymer may contain inorganic particles and / or organic particles.
- inorganic particles and / or organic particles are contained, it is preferable in that curing shrinkage of the coating film is suppressed.
- the inorganic particles include inorganic oxide particles such as silicon dioxide particles, titanium dioxide particles, zirconium oxide particles, aluminum oxide particles, tin dioxide particles, antimony pentoxide particles, and antimony trioxide particles.
- the organic particles include resin particles such as acrylic resin, polystyrene, polysiloxane, melamine resin, benzoguanamine resin, polytetrafluoroethylene, cellulose acetate, polycarbonate, and polyamide.
- reactive inorganic oxide particles treated with a coupling agent When using inorganic particles, reactive inorganic oxide particles treated with a coupling agent may be used. When organic particles are used, reactive organic oxide particles treated with a coupling agent may be used. By treating with a coupling agent, the bonding strength with the acrylic polymer can be increased. As a result, surface hardness and scratch resistance can be improved, and dispersibility of inorganic oxide particles and organic particles can be improved.
- Examples of coupling agents include ⁇ -aminopropyltriethoxysilane, ⁇ -aminopropyltrimethoxysilane, ⁇ -glycidoxypropyltriethoxysilane, ⁇ -glycidoxypropyltrimethoxysilane, and ⁇ -mercaptopropyltrimethoxy.
- Examples thereof include silane, ⁇ -aminopropyltriethoxysilane, and ⁇ -aminopropyltriethoxyaluminum. These may be used individually by 1 type and may use 2 or more types together.
- the treatment amount of the coupling agent is preferably 0.1 to 20 parts by mass, and more preferably 1 to 10 parts by mass with respect to 100 parts by mass of the inorganic oxide particles or organic particles.
- the thickness of the hard coat layer is not particularly limited, but can be 0.5 ⁇ m or more, for example, and can be selected within a range of 1.0 ⁇ m or more and 2.0 ⁇ m or more. Although an upper limit changes with uses, it is also possible to select within the range of 100 micrometers or less, 50 micrometers or less, and 20 micrometers or less, for example.
- the easy adhesion layer is provided between the transparent base material layer and the hard coat layer, and has a function of adhering the layers. Moreover, the easily bonding layer may be provided between the double-sided pressure-sensitive adhesive sheet and the transparent substrate layer or the hard coat layer.
- the easy adhesion layer preferably contains an acrylic resin or a polyester resin. Moreover, you may contain urethane type resin etc. as needed. As acrylic resin used for an easily bonding layer, what is polymerized from an acrylic monomer as shown below is illustrated.
- alkyl acrylate or alkyl methacrylate having a linear, branched or cyclic alkyl group, a hydroxy-containing monomer, an epoxy group-containing monomer, a monomer containing an amide group, etc. are not limited thereto. Absent. These monomer components may be copolymerized using two or more kinds.
- the polyester resin include those that are polycondensed from a polybasic acid component and a polyol component.
- the polybasic acid used include terephthalic acid, isophthalic acid, and diphenylcarboxylic acid.
- the polyol component include, but are not limited to, ethylene glycol and diethylene glycol.
- These monomer components may be copolymerized using two or more kinds.
- the urethane resin include those obtained as a reaction product of a polyol compound and an isocyanate compound.
- the polyol compound used include polyester polyol, polyether diol, and polyacetal diol.
- the isocyanate compound include tolylene diisocyanate and phenylene diisocyanate, but are not limited thereto.
- these components can also be reacted using 2 or more types. Further, if necessary, a chain extender, a crosslinking agent and the like may be used.
- Particles can be added to the easy-adhesion layer for the purpose of imparting slipperiness and adjusting the refractive index.
- the particles include inorganic pigments and organic fillers, but it is preferable to use silica because the refractive index is relatively close to the resin of the easy-adhesion layer and high transparency can be obtained.
- the particles used for the purpose of adjusting the refractive index of the easy-adhesion layer include alumina-silica composite, titanium oxide, zirconium oxide, and zinc oxide, but are not limited thereto. Two or more kinds of these particles may be used.
- additives such as an antistatic agent, an ultraviolet absorber, and a plasticizer may be added to the easy-adhesion layer.
- a surfactant or a pH adjuster may be added for the purpose of improving coating suitability and reactivity.
- the thickness of the easy-adhesion layer is not particularly limited, but can be, for example, 0.1 nm or more, and can be selected within the range of 1 nm or more and 5 nm or more. Although an upper limit changes with uses, it is also possible to select within the range of 1 micrometer or less, 100 nm or less, and 50 nm or less, for example.
- polyester-type resin for a transparent base material layer
- the polyester resin sheet is melted and extruded, it is stretched 3 to 10 times in the longitudinal direction to form a longitudinally stretched polyester resin film, and is subjected to corona discharge treatment as necessary.
- An easy-adhesion layer is applied to at least one surface and dried to form the easy-adhesion layer.
- the film having the easy-adhesion layer is stretched 3 to 10 times in the transverse direction to form an easy-adhesion layer stretched in the transverse direction at the same time as the formation of the biaxially stretched polyester resin film.
- the easy-adhesion layer may be formed by simultaneously extruding the resin for resin and the resin for the easy-adhesion layer to form a laminated film, and biaxially stretching the laminated film 9 to 100 times by a known method.
- surface treatment may be performed by a known method such as corona discharge treatment or flame treatment, if necessary.
- the peeling layer may be formed in the opposite side to the side in which the transparent base material layer or the hard-coat layer was formed of the double-sided adhesive sheet. Since the pressure-sensitive adhesive sheet with a transparent substrate contains a pressure-sensitive adhesive, if it is exposed, it may stick to an unintended article or the double-sided pressure-sensitive adhesive sheet itself may deteriorate. Therefore, in order to physically and chemically protect the double-sided pressure-sensitive adhesive sheet, a release layer is provided on the surface of the double-sided pressure-sensitive adhesive sheet, and the double-sided pressure-sensitive adhesive sheet is exposed by peeling off the release layer during use. And can be bonded to other members.
- Examples of the release layer include those obtained by applying a release agent such as silicone to various plastic films to form a release agent layer, and a polypropylene film alone, and are used as a release sheet for a normal double-sided pressure-sensitive adhesive sheet. Things can be used.
- the double-sided pressure-sensitive adhesive sheet is applied to the conductive member when the double-sided pressure-sensitive adhesive sheet has a haze of more than 10% and less than 20%. Can be adhered with sufficient adhesive strength, and the pattern of the conductive portion can be made invisible.
- the display screen of the display device can be favorably viewed on the transparent support side of the conductive member. it can.
- the optical member of the present invention is configured by bonding the double-sided pressure-sensitive adhesive sheet of the present invention to a conductive member provided with a conductive portion on a part of a transparent support.
- the surface of the transparent support on which no conductive part is formed functions as a non-conductive part.
- the double-sided pressure-sensitive adhesive sheet of the present invention is bonded so as to be in direct contact with at least part of the conductive part of the conductive member, and preferably is in direct contact with at least part of the conductive part and at least part of the non-conductive part. Are pasted together.
- the column of said (1) double-sided adhesive sheet can be referred.
- the optical member of the present invention may be configured by bonding the pressure-sensitive adhesive sheet with a transparent substrate of the present invention to a conductive member having a conductive part provided on a part of the transparent support.
- the double-sided pressure-sensitive adhesive sheet of the present invention is bonded to a conductive member having a conductive part provided on a part of the transparent support, and further on the side opposite to the conductive member of the double-sided pressure-sensitive adhesive sheet.
- At least one of a transparent base material layer and a hard coat layer may be provided, and further, between the double-sided pressure-sensitive adhesive sheet and the transparent base material layer or the hard coat layer, and between the transparent base material layer and the hard coat layer.
- An adhesive layer may be provided.
- a transparent base material layer a hard-coat layer, and an easily bonding layer
- the description about the structure of the transparent base material layer which comprises an adhesive sheet with a transparent base material, a hard-coat layer, and an easily bonding layer can be referred.
- the transparent support body and electroconductive part which comprise the electroconductive member of an optical member are demonstrated.
- Transparent support As the transparent support for the conductive member, any support made of a transparent material, which is usually used for optical members such as glass, can be used. If this invention is applied, even if the transparent support body which consists of glass, for example is damaged, scattering of glass will be suppressed with a double-sided adhesive sheet, and the safety
- the conductive part is a layer made of a conductive material, and is formed on the transparent support in a pattern according to the use of the conductive member.
- the conductive portion is a pattern corresponding to a uniform layer having substantially uniform conductive performance in the in-plane direction and a lead electrode or the like. And having an electrode layer formed around the electrode layer.
- the conductive portion is formed as a conductive layer in which the conductive performance is regularly patterned.
- the surface of the transparent support on which no conductive part is formed functions as a non-conductive part for position detection.
- a protective film for preventing oxidation of the conductive film may be further formed over the conductive portion.
- the conductive performance of the conductive layer can be shown by, for example, the surface resistance measured by the method described in JIS-K7194.
- the surface resistance is 1 ⁇ 10 5 ⁇ / sq or less. Is preferably 1 ⁇ 10 3 ⁇ / sq or less.
- the surface resistance is preferably 0.1 ⁇ / sq or more.
- the range of the surface resistance of the conductive layer is preferably 0.1 to 1 ⁇ 10 5 ⁇ / sq, more preferably 0.1 to 1 ⁇ 10 3 ⁇ / sq.
- the non-conductive portion has a surface resistance measured by, for example, a method described in JIS-K6911, for example, in order for the touch panel to perform more accurate position detection, and more preferably 1 ⁇ 10 9 ⁇ / sq. 11 ⁇ / sq or more and 1 ⁇ 10 13 ⁇ / sq or less, more preferably 1 ⁇ 10 12 ⁇ / sq or less, and it is better to be clearly insulated.
- the range of the surface resistance of the non-conductive portion is preferably 1 ⁇ 10 9 to 1 ⁇ 10 13 ⁇ / sq, and more preferably 1 ⁇ 10 11 to 1 ⁇ 10 12 ⁇ / sq.
- a known conductive substance can be applied as the material of the conductive portion.
- an inorganic material may be used.
- the inorganic material include metals such as gold, silver, copper, aluminum, nickel, and cobalt, or indium tin oxide (Indium Tin Oxide ( ITO)), indium-zinc oxide (IZO), zinc oxide (Zinc Oxide (ZnO)), or zinc-tin oxide (Zinc Tin Oxide (ZTO)), or antimony-tin oxide ( ATO) and the like can be exemplified.
- An organic conductor may be used as the conductive substance, and examples of the organic conductor include conductive carbon materials such as conductive carbon nanotubes and graphene, or conductive polymers such as polythiophene or polyaniline, It is not limited to these. Among them, ITO is most preferably used as an inorganic material because it is highly reliable and has excellent transparency and conductivity. In addition, PEDOT / PSS, which is a kind of organic conductive polymer polythiophene, is also suitably used because it has the characteristics of excellent flexibility and the characteristics of transparency and conductivity.
- PEDOT / PSS refers to a polymer complex in which PEDOT (a polymer of 3,4-ethylenedioxythiophene) and PSS (a polymer of styrene sulfonic acid) coexist.
- PEDOT a polymer of 3,4-ethylenedioxythiophene
- PSS a polymer of styrene sulfonic acid
- metal and conductive carbon materials are inferior in transparency, so when using metals or conductive carbon materials as the material of conductive layer 2, use It is desirable to ensure transparency by forming a metal or conductive carbon material into a nanowire and coating it or processing it into a mesh.
- silver is preferably used because it is a conductor having the highest conductivity.
- the thickness of the conductive portion needs to be set in consideration of the conductivity and transparency of the conductor to be applied, and the thickness is not particularly limited.
- the thickness is 30 to 600 mm.
- a thickness of 80 to 5000 mm is preferable.
- the conductive portion can be formed by a known method. Specifically, the conductive portion may be formed by a method in which a conductive layer is partially provided on a transparent substrate by various printing methods or the like, and after forming a uniform conductive layer, a part thereof is etched or the like. The conductive portion may be formed by removing the conductive portion. Methods for forming a uniform conductive layer include thin film formation methods such as vacuum deposition, sputtering, ion plating, spray pyrolysis, chemical plating, electroplating, coating, or a combination thereof. Can be mentioned. From the viewpoints of film formation speed, large area film formability, and productivity, vacuum deposition and sputtering are preferred.
- an appropriate pretreatment such as a corona discharge treatment, an ultraviolet irradiation treatment, a plasma treatment, a sputter etching treatment, or an undercoat treatment may be performed on the surface of the laminated body in order to enhance adhesion. .
- the double-sided pressure-sensitive adhesive sheet adheres to the conductive member with sufficient adhesive force because the haze of the double-sided pressure-sensitive adhesive sheet is more than 10% and less than 20%.
- the pattern is invisible.
- the display screen of a display apparatus can be visually recognized favorably by the transparent support body side of an electrically-conductive member.
- Examples 5 to 7 The light diffusing particles were changed to KMR-3TA (average particle size: 3 ⁇ m) manufactured by Soken Chemical Co., Ltd., and the same procedure as in Example 1 was performed except that the number of added parts was changed to the ratio shown in Table 1.
- Screen Visibility A display device was further provided on the side opposite to the electrode member of the bonded product used in the evaluation of the invisibility of the conductive part. And the screen was observed visually from the transparent support body side of an electrode member, and the visibility of the screen was evaluated in accordance with the following criteria. ⁇ : The screen is easy to see ⁇ : The screen is slightly difficult to see ⁇ : The screen is hard to see Table 1 shows the above evaluation results.
- the pressure-sensitive adhesive sheet with the transparent base material layer of Comparative Examples 1 and 2 having a haze of 10% or less the ITO pattern is not invisible and the haze is 20% or more.
- the adhesive sheet with a base material layer had poor screen visibility when a display device was provided.
- Example 12 and Example 13 were obtained in the same manner as in Example 1 except that the light diffusing particles added to the adhesive composition were changed to incompatible resin and the addition amount was changed as shown in Table 2. .
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Abstract
Description
例えば特許文献1には、金属面を腐食させず、リワーク時に金属面から容易に剥離させることができ、さらに透明性が良好な金属面貼付用感圧性粘着シートが提案されている。
この問題を解決するために、粘着シートの屈折率を調整することにより導電部のパターン可視化を防ぐことが考えられる。しかし、粘着力を維持しながら所望の屈折率に調整することは容易ではない。また、粘着シートには、導電部のパターン可視化を防ぐだけでなく、導電部材と表示装置の貼合に使用したときに画面の視認性も良好に維持する必要性があるが、その両立も容易ではない。
[1] 透明支持体上の一部に導電部が設けられた導電部材の貼合用であって、ヘイズが10%超かつ20%未満であることを特徴とする両面粘着シート。
[2] アクリル系重合体(A)と架橋剤(B)を含有する粘着剤組成物から形成されることを特徴とする、[1]に記載の両面粘着シート。
[3] 粘着剤組成物が、さらに光拡散微粒子(C)を含有することを特徴とする、[2]に記載の両面粘着シート。
[4] 粘着剤組成物が、アクリル系重合体(A)100質量部に対し、光拡散微粒子(C)を1~15質量部含むことを特徴とする、[2]又は[3]に記載の両面粘着シート。
[5] 光拡散微粒子(C)の平均粒径が0.1~20μmであることを特徴とする、[3]または[4]に記載の両面粘着シート。
[6] 粘着剤組成物が、さらに非相溶樹脂(D)を含有することを特徴とする、[2]~[5]のいずれかに記載の両面粘着シート。
[7] 粘着剤組成物が、アクリル系重合体(A)100質量部に対し、非相溶樹脂(D)を1~50質量部含むことを特徴とする、[2]~[6]のいずれかに記載の両面粘着シート。
[8] [1]~[7]のいずれかに記載の両面粘着シートの少なくとも一方の粘着面に剥離シートが積層された、剥離シート付き両面粘着シート。
[9] [1]~[7]のいずれかに記載の両面粘着シートの両面に互いに剥離性が異なる剥離シートがそれぞれ積層された、剥離シート付き両面粘着シート。
[10] 透明支持体上の一部に導電部が設けられた導電部材の貼合用であって、[1]~[7]のいずれかに記載の両面粘着シートの一方の粘着面と透明基材層が接する積層構造を含む透明基材付き粘着シート。
[11] 透明支持体上の一部に導電部が設けられた導電部材の貼合用であって、[1]~[7]のいずれかに記載の両面粘着シートと透明基材層とハードコート層をこの順に有する積層構造を含んでいて、両面シートの一方の粘着面と透明基材層とが接している透明基材付き粘着シート。
[12] 透明支持体上の一部に導電部が設けられた導電部材の貼合用であって、透明基材層、[1]~[7]のいずれかに記載の両面粘着シート、剥離シートをこの順に有する積層構造を含んでいて、両面シートの一方の粘着面と透明基材層とが接している透明基材付き粘着シート。
[13] 透明支持体上の一部に導電部が設けられた導電部材に、[1]~[7]のいずれかに記載の両面粘着シートの一方の粘着面を導電部の少なくとも一部が接するように貼合した光学部材。
[14] 透明支持体上の一部に導電部が設けられた導電部材、[1]~[7]のいずれかに記載の両面粘着シート、透明基材層を順に積層した光学部材であって、導電部の少なくとも一部が両面粘着シートに接している光学部材。
[15] 透明支持体上の一部に導電部が設けられた導電部材、[1]~[7]のいずれかに記載の両面粘着シート、透明基材層、ハードコート層を順に積層した光学部材であって、導電部の少なくとも一部が両面粘着シートに接している光学部材。
また、本発明の両面粘着シートを用いれば、導電部が不可視化されており、表示装置と貼合したときに画面の視認性が良好な光学部材を得ることができる。
本発明の両面粘着シートは、透明支持体上の一部に導電部が設けられた導電部材の貼合用であって、ヘイズが10%超かつ20%未満である点に特徴がある。なお、本発明において「ヘイズ」とは、JIS K7136に準拠した方法で測定される値のことをいい、このヘイズ値は両面粘着シートの形状の場合は、両面粘着シートのみ(剥離シートのない状態)のヘイズ値を測定することは困難なため、松浪ガラス社製のスライドガラス(品番:S9112)に貼合し、このガラスと本発明の両面粘着シートのみの積層体にしたときのヘイズ値であり、透明基材層を有している透明フィルム粘着シートの形状の場合は、上記ガラスと該透明フィルム粘着シートとを貼合した透明基材層と両面粘着シートとガラスの積層体でのヘイズ値である。
ヘイズが上記範囲にある両面粘着シートを、導電部と接するように導電部材に貼合すると、ヘイズが10%超であることにより、両面粘着シート内に入射した光が適度に拡散され、電極部のパターンが外側から視認しにくくなる。また、両面粘着シートは、ヘイズが20%未満であることにより高い透明度を有する。このため、この両面粘着シートで導電部材と表示装置とを貼合した場合、表示装置の表示画面を導電部材の透明支持体側で鮮明に視認することができる。さらに、両面粘着シートのヘイズは、例えば光拡散微粒子(C)を適量混合する方法により、粘着力を確保しつつ容易に調整することができる。したがって、ヘイズを上記範囲に規定することにより、導電部材に適用したときに、十分な粘着力を維持しながら導電部のパターンを不可視化し、かつ導電部材と表示装置の貼合に使用したときに画面の視認性も良好な両面粘着シートを実現することができる。ここで、両面粘着シートのヘイズの好ましい範囲は12~18%であり、より好ましい範囲は14~16%である。
本発明の両面粘着シートを形成する粘着剤組成物は、視認性を低下させない程度の透明性を有するものが好ましく、粘着剤組成物のベースポリマーとしてはアクリル系重合体(A)が好ましい。これにより、粘着性に優れた両面粘着シートを得ることができる。
アクリル系重合体(A)としては、非架橋性の(メタ)アクリル酸エステル単位(a1)を主成分とし、これに架橋性官能基を有するアクリル単量体単位(a2)を含有する共重合体を用いることが好ましい。本明細書において、「単位」は重合体を構成する繰り返し単位(単量体単位)である。
架橋性官能基を有するアクリル単量体単位(a2)は架橋剤(B)を用いる場合の反応点となり、架橋により粘着力や凝集力、耐熱性の制御を可能とする。アクリル系重合体(A)における架橋性官能基を有するアクリル単量体単位(a2)の使用量は、共重合体を構成する全単量体質量中に占める割合として0.01~20質量%とすることが好ましい。より好ましくは0.1~15質量%であり、さらに好ましくは0.5~10質量%である。架橋性アクリル単量体単位(a2)の含有量が上記範囲の下限値以上であれば架橋性を充分に有しており、上記範囲の上限値以下であれば、必要な粘着物性を維持できる。
なお、本発明において、「(メタ)アクリレート」とは、「アクリレート」及び「メタクリレート」の両方を含むことを意味し、「(メタ)アクリル酸」とは、「アクリル酸」及び「メタクリル酸」の両方を含むことを意味する。
アクリル系重合体(A)における他の単量体単位の含有量は0~20質量%であることが好ましく、0~15質量%であることがより好ましい。
アクリル系重合体(A)の重量平均分子量は、10万~200万が好ましく、30万~150万がより好ましい。重量平均分子量が上記下限値以上であると十分な耐久性を確保でき、上記上限値を超えなければ十分な凹凸追従性が確保できる。なお、アクリル系重合体(A)の重量平均分子量は架橋剤(B)で架橋される前の値である。該重量平均分子量は、サイズ排除クロマトグラフィー(SEC)により測定し、ポリスチレン基準で求めた値である。
本発明で用いられる粘着剤組成物は、粘着剤が官能基を有する単量体を用いた共重合体の場合は、架橋剤(B)を配合することにより架橋処理を施すことができる。
架橋剤(B)としては、例えば、イソシアネート化合物、エポキシ化合物、オキサゾリン化合物、アジリジン化合物、金属キレート化合物、ブチル化メラミン化合物などが挙げられ、これらは必要に応じ2種類以上を併用しても良く、アクリル系重合体(A)で用いる官能基との反応性を考慮して選択することが好ましい。
これら架橋剤(B)の中でも、アクリル系重合体(A)を容易に架橋できることから、イソシアネート化合物、エポキシ化合物が好ましい。イソシアネート化合物としては、例えば、トリレンジイソシアネート、キシリレンジイソシアネート、ヘキサメチレンジイソシアネート、イソホロンジイソシアネートなどが挙げられる。エポキシ化合物としては、例えば、エチレングリコールジグリシジルエーテル、ポリエチレングリコールジグリシジルエーテル、プロピレングリコールジグリシジルエーテル、ポリプロピレングリコールジグリシジルエーテル、グリセリンジグリシジルエーテル、ネオペンチルグリコールジグリシジルエーテル、1,6-ヘキサンジオールジグリシジルエーテル、テトラグリシジルキシレンジアミン、1,3-ビス(N,N-ジグリシジルアミノメチル)シクロヘキサン、トリメチロールプロパンポリグリシジルエーテル、ジグリセロールポリグリシジルエーテル、ポリグリセロールポリグリシジルエーテル、ソルビトールポリグリシジルエーテルなどが挙げられる。
また、架橋剤(B)の含有量は、粘着剤組成物の総質量に対し、0.01~5.0質量%であることが好ましく、0.02~2.0質量%であることがより好ましい。
上記によって架橋された架橋後の粘着剤組成物のゲル分率は、20~98%、好ましくは30~90%、より好ましくは40~80%である。ゲル分率が20%以上なら十分な凝集力が得られ、98%以下なら十分な粘着力や被着体への濡れ性が得られる。なお、ここで記載しているゲル分率とは、所定量の粘着剤組成物を粘着剤組成物の質量の2倍量以上の酢酸エチルやトルエンなどの溶媒に浸漬し、この浸漬物を40℃で24時間処理した後、150メッシュのワイヤメッシュにてろ過し、可溶分を取り除いた残分の乾燥重量を浸漬前の粘着剤組成物の質量で割った値のパーセント表示である。
粘着剤組成物には、アクリル系重合体(A)および架橋剤(B)の他、両面粘着シートのヘイズの調整を行う場合には光拡散微粒子(C)及び非相溶樹脂(D)から選択される少なくとも1種が混合される。光拡散微粒子(C)及び非相溶樹脂(D)については、後述の[ヘイズの調整]の欄で説明する。また、粘着剤組成物には、この他に以下のような添加剤が添加されていてもよい。
紫外線吸収剤は、紫外領域に極大吸収波長を有するものの中から選択することができ、波長350nm以上に極大吸収波長を有する紫外線吸収剤を用いることが好ましい。波長350nm以上に極大吸収波長を有する紫外線吸収剤として、例えば下記一般式(1)または(2)で示される化合物を挙げることができる。
粘着剤組成物に添加される添加剤として、ヒンダードアミン系化合物に代表される光安定剤を好ましく例示することができる。また、ヒンダードフェノール系化合物に代表される酸化防止剤を併用することも好ましい。酸化防止剤は、一般にラジカル連鎖停止剤とよばれる一次酸化防止剤と、過酸化物分解剤として作用する二次酸化防止剤とに分類される。一次酸化防止剤としては、ヒンダードフェノール系酸化防止剤、アミン系酸化防止剤、ラクトン系酸化防止剤が挙げられる。また、二次酸化防止剤としては、リン系酸化防止剤、イオウ系酸化防止剤が挙げられる。
これら酸化防止剤は1種を単独で使用しても良いし、2種以上を併用しても良い。特にITOの腐食防止効果を期待する場合は、1次酸化防止剤と2次酸化防止剤を併用すると効果が得られやすいため好ましい。
両面粘着シートのヘイズの調整は、(i)粘着剤組成物に光拡散微粒子(C)を所望のヘイズになる量で混合する方法、または(ii)粘着剤組成物に非相溶樹脂(D)を所望のヘイズになる量で混合する方法により行うことが好ましい。なお、(i)及び(ii)の方法を組み合わせて用いることにより、両面粘着シートのヘイズの調整を行ってもよい。以下において、各方法を説明する。
光拡散微粒子(C)は、両面粘着シートに入射した光を拡散させる機能を有する微粒子であればよく、有機微粒子であっても無機微粒子であってもよい。
無機微粒子としては、例えば、シリカ、炭酸カルシウム、水酸化アルミニウム、水酸化マグネシウム、クレー、タルク、酸化アルミニウム、酸化チタン等からなる微粒子を挙げることができる。
有機微粒子としては、例えば、ポリスチレン樹脂、ポリエチレンやポリプロピレン等のポリオレフィン系樹脂、ポリメタクリレート系樹脂やポリアクリレート系樹脂等の(メタ)アクリル系樹脂、エポキシ樹脂、シリコーン樹脂、これらの樹脂に架橋構造を形成した架橋高分子、エチレン、プロピレン、スチレン、メタクリル酸メチル、ベンゾグアナミン、ホルムアルデヒド、メラミン、ブタジエン等から選ばれる2種又はそれ以上の単量体が共重合された共重合樹脂等からなる樹脂粒子を用いることができる。
また、無機と有機の中間的な構造を有するケイ素含有化合物からなる微粒子(例えばモメンティブ・パフォーマンス・マテリアルズ・ジャパン社製のトスパールシリーズ)等も光拡散微粒子(C)として用いることができる。
これらの光拡散微粒子(C)は1種類を単独して用いてもよいし、2種類以上を組み合わせて用いてもよい。また、有機微粒子、無機微粒子、無機と有機の中間的な構造を有する微粒子を組み合わせて使用することも可能である。
このうち、本発明で用いる光拡散微粒子(C)としては、両面粘着シートの全光線透過率を過度に低下させないものであるのが好ましく、透明性が高いアクリルビーズやシリカビーズが好適である。
また、光拡散微粒子(C)の平均粒径は、0.1~20μmであることが好ましく、0.3~17μmであることがより好ましく、0.5~12μmであることがさらに好ましい。ここで、本明細書中において「平均粒径」とは、透過型電子顕微鏡もしくは走査型電子顕微鏡を用いて、光拡散粒子の粒子画像の最大長(Dmax:粒子画像の輪郭上の2点における最大長さ)と、最大長垂直長(DV-max:最大長に平行な2本の直線で粒子画像を挟んだときの、この2本の直線間の最短長さ)を測長し、その相乗平均値(Dmax×DV-max)1/2を粒子径として、この方法で任意の100個の光拡散粒子について粒子径を測定し、その算術平均値のことをいう。光拡散微粒子(C)の平均粒径が20μm以下であれば、両面粘着シートを肉眼で視認したときに粒状感や異物感が感じにくい傾向があり、平均粒径が0.1μm以上であれば、両面粘着シートのヘイズを所望の値に調整しやすい傾向がある。
本発明の両面粘着シートは、例えば、剥離シート上に粘着剤組成物を塗工して塗膜を形成し、該塗膜を加熱して硬化物とすることにより得られる。
剥離シートは、少なくとも片面に離型性を有するシートである。剥離シートとしては、剥離シート用基材と該剥離シート用基材の片面に設けられた剥離剤層とを有する剥離性積層シート、あるいは、低極性基材としてポリエチレンフィルムやポリプロピレンフィルム等のポリオレフィンフィルムが挙げられる。
剥離性積層シートにおける剥離シート用基材としては、紙類、高分子フィルムが使用される。剥離剤層を構成する剥離剤としては、例えば、汎用の付加型もしくは縮合型のシリコーン系剥離剤や長鎖アルキル基含有化合物が用いられる。特に、反応性が高い付加型シリコーン系剥離剤が好ましく用いられる。
シリコーン系剥離剤としては、具体的には、東レ・ダウコーニングシリコーン社製のBY24-4527、SD-7220等や、信越化学工業(株)製のKS-3600、KS-774、X62-2600などが挙げられる。また、シリコーン系剥離剤中にSiO2単位と(CH3)3SiO1/2単位あるいはCH2=CH(CH3)SiO1/2単位を有する有機珪素化合物であるシリコーンレジンを含有することが好ましい。シリコーンレジンの具体例としては、東レ・ダウコーニングシリコーン社製のBY24-843、SD-7292、SHR-1404等や、信越化学工業(株)製のKS-3800、X92-183等が挙げられる。
剥離シートは、剥離しやすくするために、一方の剥離シートと他方の剥離シートとでそれぞれ剥離性が異なることが好ましい。つまり、一方からの剥離性と他方からの剥離性とが異なると、剥離性が高い方の剥離シートだけを先に剥離することが容易となる。その場合、貼合方法や貼合順序に応じて一方の剥離シートと他方の剥離シートの剥離性を調整すればよい。
塗工液には溶媒が含まれる。溶媒としては、例えば、メタノール、エタノール、イソプロパノール、アセトン、メチルエチルケトン、トルエン、n-ヘキサン、n-ブチルアルコール、メチルイソブチルケトン、メチルブチルケトン、エチルブチルケトン、シクロヘキサノン、酢酸エチル、酢酸ブチル、プロピレングリコールモノメチルエーテルアセテート、エチレングリコールモノエチルエーテル、プロピレングリコールモノメチルエーテル、N-メチル-2-ピロリドンなどが使用される。これらは1種以上を単独で使用してもよいし、2種以上を混合して使用してもよい。
塗膜の加熱は、加熱炉、赤外線ランプ等の公知の加熱装置を用いて実施できる。
両面粘着シートの厚みは10~200μmであることが好ましく、20~100μmであることがより好ましい。両面粘着シートの厚みが10μm以上であれば、充分な粘着力を確保でき、長時間使用しても浮きや剥がれが生じにくくなる。また、両面粘着シートの厚みが200μm以下であれば、例えば表示装置の大きさに両面粘着シートをカットする際にカット刃などに粘着剤が付着して不良率が上がるなどのトラブルが生じにくいという利点がある。
本発明の透明基材付き粘着シートは、透明支持体上の一部に導電部が設けられた導電部材の貼合用であって、本発明の両面粘着シートと、両面粘着シートの一方の粘着面に接する透明基材層からなる。透明基材層はハードコート層を有していてもよい。透明基材層とハードコート層を積層する場合には、透明基材層とハードコート層との間に易接着層を設けることが好ましい。図1に示す態様は、本発明の透明基材付き粘着シートの一例であり、両面粘着シート13、易接着層11b、透明基材層12、易接着層11a、およびハードコート層10が、この順に積層されて構成されている。
以下において、透明基材層、ハードコート層、易接着層について説明する。
透明基材層は、粘着シートを補強する基材として機能、又はガラス基材を用いた導電部材の飛散防止フィルム、或いは加飾フィルムとして利用される。また、透明基材層は、光学特性を有する層(位相差層など)であってもよい。すなわち、拡散粘着層を補強する基材としての機能の他に光学的機能を果たすものであってもよい。
透明基材層は、可視光線を透過する透明な材料から構成され、例えば透明な樹脂のフィルムを好適に用いることができる。透明な樹脂のフィルムとしては、例えば、ポリエチレンテレフタレート(PET)フィルム、ポリエチレンナフタレートフィルム、ポリプロピレンテレフタレートフィルム、ポリブチレンテレフタレートフィルム、ポリプロピレンナフタレートフィルム、ポリエチレンフィルム、ポリプロピレンフィルム、セロファン、ジアセチルセルロースフィルム、トリアセチルセルロースフィルム、アセチルセルロースブチレートフィルム、ポリ塩化ビニルフィルム、ポリ塩化ビニリデンフィルム、ポリビニルアルコールフィルム、エチレン-酢酸ビニル共重合体フィルム、ポリスチレンフィルム、ポリカーボネートフィルム、ポリメチルペンテンフィルム、ポリスルホンフィルム、ポリエーテルエーテルケトンフィルム、ポリエーテルスルホンフィルム、ポリエーテルイミドフィルム、ポリイミドフィルム、フッ素樹脂フィルム、ポリアミドフィルム、アクリル樹脂フィルム等が挙げられる。これらの中では、耐熱性に優れること等から、ポリエチレンテレフタレート(PET)フィルムが好ましく用いられる。
本発明の透明基材付き粘着シートを構成する透明基材層のヘイズは5以下であることが好ましく、3以下であることがより好ましく、1以下であることがさらに好ましい。
ハードコート層は、透明基材層よりも硬度が高い層であり、透明基材付き粘着シートの表面に傷が発生するのを防止する機能を有する。
ハードコート層は、硬度が高く、かつ可視光線を透過するものであることが好ましい。一般的なハードコート層の場合は、JIS B 0601で定義される中心線平均粗さが1~20nmであることが好ましく、10nm以下であることがより好ましい。中心線平均粗さは、例えば、(株)キーエンス製の超深度形状測定顕微鏡などを用いて測定することができる。
ハードコート層は、必要に応じてアンチリフレクションやアンチグレア、アンチウォーターマーク(タッチパネルモジュールと表示装置の積層体において、その間に空隙がある構成の場合、タッチパネル操作時にタッチパネルモジュールと表示装置が接触して、接触した部分が水に濡れたように見えるエラーが生じる場合があり、このエラーをウォーターマークと呼ぶ)機能を有するものであっても良い。このようなアンチグレア機能やアンチウォーターマーク機能を持ったハードコート層の場合は、JIS B 0601で定義される中心線平均粗さが20~500nmであることが好ましく、50~300nmがより好ましい。中心線平均粗さは、先述と同様に例えば、(株)キーエンス製の超深度形状測定顕微鏡などを用いて測定することができる。
重合性不飽和基を有する有機化合物のモノマーまたはオリゴマーは、熱硬化性であっても良いし、活性エネルギー線硬化性であっても良い。
なお、本発明における「(メタ)アクリル酸」とは、アクリル酸およびメタクリル酸の総称である。
易接着層は、透明基材層とハードコート層の間に設けられ、層同士を接着する機能を有する。また、易接着層は、両面粘着シートと透明基材層またはハードコート層との間に設けられていてもよい。
易接着層はアクリル系樹脂又はポリエステル系樹脂を含むことが好ましい。また、必要に応じてウレタン系樹脂等を含有しても良い。
易接着層に使用されるアクリル系樹脂としては、以下に示すようなアクリルモノマーから重合されるものが例示される。例えば、直鎖状、分岐状、環状のアルキル基を有したアルキルアクリレートやアルキルメタクリレート、ヒドロキシ含有モノマー、エポキシ基含有モノマー、アミド基を含有するモノマー等が挙げられるが、これらに限定されるものではない。また、これらのモノマー成分は、2種以上を用いて共重合しても良い。
また、ポリエステル系樹脂としては、多塩基酸成分とポリオール成分とから重縮合されるものが例示される。用いられる多塩基酸としてはテレフタル酸、イソフタル酸、ジフェニルカルボン酸等が挙げられる。また、ポリオール成分としては、エチレングリコール、ジエチレングリコール等が挙げられるが、これらに限定されるものではない。また、これらのモノマー成分は、2種類以上を用いて共重合しても良い。
また、ウレタン系樹脂としては、ポリオール化合物とイソシアネート化合物の反応生成物として得られるものが例示される。用いられるポリオール化合物としては、ポリエステルポリオール、ポリエーテルジオール、ポリアセタールジオール等が挙げられる。また、イソシアネート化合物としては、トリレンジイソシアネート、フェニレンジイソシアネート等が挙げられるが、これらに限定されるものではない。また、これらの成分は、2種類以上を用いて反応させることもできる。更に、必要であればこの他に鎖長延長剤、架橋剤などを使用しても良い。
また、別法として、ポリエステル系樹脂と易接着層用樹脂を同時に押し出し、積層フィルムとし、積層したフィルムを9~100倍に公知の方法にて2軸延伸して易接着層を形成しても良い。
また粘着剤層又はハードコート層を積層する際に、必要に応じてコロナ放電処理、火炎処理等の公知の方法により表面処理を施しても良い。
本発明の透明基材付き粘着シートは、両面粘着シートの、透明基材層またはハードコート層が形成された側と反対側に剥離層が形成されていてもよい。透明基材付き粘着シートは粘着剤を含有しているため、露出していると意図しない物品と粘着してしまったり、両面粘着シート自体が劣化してしまったりするおそれがある。このため、両面粘着シートを物理的および化学的に保護するために、両面粘着シートの表面に剥離層を設けておき、使用する際に剥離層を剥離して両面粘着シートを露出させたうえで、他の部材へ貼り合わせることができる。
本発明の光学部材は、透明支持体上の一部に導電部が設けられた導電部材に、本発明の両面粘着シートが貼合されて構成されている。この導電部材では、導電部が形成されていない透明支持体の表面は非導電部として機能する。本発明の両面粘着シートは、導電部材の少なくとも導電部の一部に直接接触するように貼合されており、好ましくは、導電部の少なくとも一部と非導電部の少なくとも一部に直接接触するように貼合されている。両面粘着シートの構成については、上記の(1)両面粘着シートの欄を参照することができる。
また、本発明の光学部材は、透明支持体上の一部に導電部が設けられた導電部材に、本発明の透明基材付き粘着シートが貼合されて構成されたものであってもよい。言い換えれば、本発明の光学部材は、透明支持体上の一部に導電部が設けられた導電部材に、本発明の両面粘着シートが貼合され、さらに両面粘着シートの導電部材と反対側に、透明基材層およびハードコート層の少なくとも一方が設けられていてもよく、さらに両面粘着シートと透明基材層またはハードコート層との間、透明基材層とハードコート層との間に易接着層が設けられていてもよい。透明基材層、ハードコート層、易接着層の構成については、透明基材付き粘着シートを構成する透明基材層、ハードコート層、易接着層の構成についての説明を参照することができる。
以下では、光学部材の導電部材を構成する、透明支持体および導電部について説明する。
導電部材の透明支持体としては、ガラス等、光学部材で通常用いられている、透明材料からなる支持体がいずれも使用可能である。本発明を適用すれば、例えばガラスからなる透明支持体が破損した場合であっても、両面粘着シートによってガラスの飛散が抑えられ、製品の安全性を高めることができる。
導電部は、導電材料からなる層であり、透明支持体上に、導電部材の用途に応じたパターンで形成されている。
導電部は、例えば、この光学部材が表面型静電容量式タッチパネル等に適用される場合には、面内方向で実質的に均一な導電性能を有する均一層と、引き出し電極等に対応するパターンで電極層の周囲に形成された電極層を有して形成される。また、この光学部材が投影型静電容量方式のタッチパネルに適用される場合には、導電部は導電性能が規則的にパターン化された導電層として形成される。この投影型静電容量方式のタッチパネルでは、導電部が形成されていない透明支持体表面は位置検知のための非導電部として機能する。なお、導電部の上に、さらに導電膜の酸化を防ぐための保護膜が形成されていても良い。
一方、非導電部は、タッチパネルがより正確な位置検知を行うために、例えばJIS-K6911に記載の方法にて測定される表面抵抗を1×109Ω/sq以上、より好ましくは1×1011Ω/sq以上として、1×1013Ω/sq以下、より好ましくは1×1012Ω/sq以下として、明確に絶縁化すると良い。非導電部の表面抵抗の範囲は、1×109~1×1013Ω/sqが好ましく、1×1011~1×1012Ω/sqがより好ましい。
中でも無機系材料としては信頼性の高さと、透明性と導電性に優れるという点で、ITOが最も好適に利用される。また、屈曲性に優れるという特徴と、透明性と導電性にも優れるという特徴を有する点で有機導電性高分子のポリチオフェンの一種であるPEDOT/PSSも好適に利用される。PEDOT/PSSとは、PEDOT(3,4-エチレンジオキシチオフェンのポリマー)とPSS(スチレンスルホン酸のポリマー)を共存させたポリマーコンプレックスを示す。
ITOやPEDOT/PSSのように比較的透明性に優れる導電体に比べ、金属や導電性炭素材料は透明性に劣るため、導電層2の材質として金属や導電性炭素材料を用いる場合は、使用する金属や導電性炭素材料をナノワイヤー化して塗工したり、メッシュ状に加工したりすることで透明性を確保すると良い。中でも、銀は、最も導電性に優れる導電体であることから、好適に利用される。
具体的には、各種印刷方式などにより、透明基板上に部分的に導電層を設ける方法で導電部を形成しても良いし、均一な導電層を形成した後、その一部をエッチングなどにより除去して導電部を形成しても良い。均一な導電層を形成する方法としては、真空蒸着法、スパッタリング法、イオンプレーティング法、スプレー熱分解法、化学メッキ法、電気メッキ法、塗布法、あるいはこれらの組合せ法などの薄膜形成法が挙げられる。膜の形成速度や大面積膜の形成性、又は生産性などの点より、真空蒸着法やスパッタリング法が好ましい。
導電部の形成に先立ち、積層体の表面に、密着性を高めるために、コロナ放電処理、紫外線照射処理、プラズマ処理、スパッタエッチング処理、又はアンダーコート処理等の適宜な前処理を施しても良い。
(実施例1~4)
攪拌機、温度計、還流冷却機、滴下装置、窒素導入管を備えた反応装置に、窒素ガスを封入した後、溶媒である酢酸エチルを注入した。次に、反応装置内に、ブチルアクリレート(BA)を60質量%、メチルアクリレート(MA)を36質量%、2-ヒドロキシエチルアクリレート(2EHA)を4質量%投入し、反応開始剤としてアゾビスイソブチロニトリルを0.1質量%投入して重合反応を行った後、反応液に溶媒を注入してアクリル重合体溶液を得た。このアクリル重合体溶液に、固形分100質量部に対して、架橋剤(日本ポリウレタン工業(株)製:コロネートL55E)を0.8質量部、光拡散粒子(綜研化学(株)製:MX-1000(平均粒径:10μm))を表1に示す割合で添加し、実施例1~4の粘着剤組成物を得た。
この粘着剤組成物を、第1の剥離シート(三菱樹脂(株)製:MRV#50)の剥離剤層表面にアプリケータにより塗工し、100℃で2分間乾燥させて粘着層(両面粘着シート)を得た。次に、第2の剥離シート(三菱樹脂(株)製:MRE#38)の剥離剤層側を粘着層に重ねて、ラミネーターにより貼りあわせた。これによって、第1の剥離シートと第2の剥離シートを有する両面粘着シートを得た。粘着層の乾燥後の塗工量は25μmであった。
光拡散粒子を綜研化学(株)製:KMR-3TA(平均粒径:3μm))に変え、添加部数を表1に示す割合に変えた以外は実施例1と同様にした。
(実施例8~11)
剥離シート(三菱樹脂(株)製:MRE#38)の剥離剤層表面に実施例1~4の粘着剤組成物をアプリケータにより塗工し、100℃で2分間乾燥させて粘着層を得た。次に、透明基材層(東洋紡(株)製:A4100#100、片面易接着層付きPETフィルム)の易接着層側に粘着層に重ねて、ラミネーターにより貼りあわせ、実施例8~11の透明基材付き粘着シートを得た。粘着層の乾燥後の塗工量は25μmであった。
粘着剤組成物に添加する光拡散粒子の添加量を表1に示すように変えたこと以外は、実施例5と同様にして透明基材層付き粘着シートを作製した。
1.ヘイズ
実施例1~7の両面粘着シートの第2の剥離シートを剥離し、両面粘着シートの片方の面を松浪ガラス社製のスライドガラス(品番:S9112)に貼合し、第1の剥離シートを剥離した。また、実施例8~11および比較例1~3の透明基材層付き粘着シートの粘着面を松浪ガラス社製のスライドガラス(品番:S9112)に貼合した。これらの貼合物のヘイズを日本電色工業(株)製のNDH4000を用いて測定した。
透明支持体上にITOパターンが形成された電極部材を用意し、この電極部材に、各実施例および各比較例で作製した積層体の両面粘着シートをITOパターンと接するように貼合した。実施例1~7の積層体を用いた場合は、貼合後に剥離シートを剥離した。そして、電極部材の透明支持体側からITOパターンが見えるか否かを目視にて観察し、以下の基準に従い評価した。
◎:ITOパターンが全く視認されない
○:ITOパターンがほぼ見えない
△:ITOパターンが視認される
×:ITOパターンがはっきりと視認される
導電部の不可視化の評価で用いた貼合品の電極部材とは反対側に、さらに表示装置を設けた。そして、電極部材の透明支持体側から画面を目視にて観察し、画面の視認性を以下の基準に従い評価した。
○:画面が見やすい
△:画面がやや見えにくい
×:画面が見えにくい
以上の評価結果を表1に示す。
粘着組成物に添加する光拡散粒子を非相溶樹脂へ変更し、添加量を表2に示すように変えたこと以外は、実施例1と同様にして実施例12及び実施例13を得た。
11a、11b 易接着層
12 透明基材層
13 両面粘着シート
Claims (15)
- 透明支持体上の一部に導電部が設けられた導電部材の貼合用であって、ヘイズが10%超かつ20%未満であることを特徴とする両面粘着シート。
- アクリル系重合体(A)と架橋剤(B)を含有する粘着剤組成物から形成されることを特徴とする、請求項1に記載の両面粘着シート。
- 前記粘着剤組成物が、さらに光拡散微粒子(C)を含有することを特徴とする、請求項2に記載の両面粘着シート。
- 前記粘着剤組成物が、アクリル系重合体(A)100質量部に対し、光拡散微粒子(C)を1~15質量部含むことを特徴とする、請求項2又は3に記載の両面粘着シート。
- 光拡散微粒子(C)の平均粒径が0.1~20μmであることを特徴とする、請求項3または4に記載の両面粘着シート。
- 前記粘着剤組成物が、さらに非相溶樹脂(D)を含有することを特徴とする、請求項2~5のいずれか1項に記載の両面粘着シート。
- 前記粘着剤組成物が、アクリル系重合体(A)100質量部に対し、非相溶樹脂(D)を1~50質量部含むことを特徴とする、請求項2~6のいずれか1項に記載の両面粘着シート。
- 請求項1~7のいずれか1項に記載の両面粘着シートの少なくとも一方の粘着面に剥離シートが積層された、剥離シート付き両面粘着シート。
- 請求項1~7のいずれか1項に記載の両面粘着シートの両面に互いに剥離性が異なる剥離シートがそれぞれ積層された、剥離シート付き両面粘着シート。
- 透明支持体上の一部に導電部が設けられた導電部材の貼合用であって、請求項1~7のいずれか1項に記載の両面粘着シートの一方の粘着面と透明基材層が接する積層構造を含む透明基材付き粘着シート。
- 透明支持体上の一部に導電部が設けられた導電部材の貼合用であって、請求項1~7のいずれか1項に記載の両面粘着シートの一方の粘着面と透明基材層とハードコート層をこの順に有する積層構造を含んでいて、前記両面シートの一方の粘着面と前記透明基材層とが接している透明基材付き粘着シート。
- 透明支持体上の一部に導電部が設けられた導電部材の貼合用であって、透明基材層、請求項1~7のいずれか1項に記載の両面粘着シート、剥離シートをこの順に有する積層構造を含んでいて、前記両面シートの一方の粘着面と前記透明基材層とが接している透明基材付き粘着シート。
- 透明支持体上の一部に導電部が設けられた導電部材に、請求項1~7のいずれか1項に記載の両面粘着シートの一方の粘着面を前記導電部の少なくとも一部が接するように貼合した光学部材。
- 透明支持体上の一部に導電部が設けられた導電部材、請求項1~7のいずれか1項に記載の両面粘着シート、透明基材層を順に積層した光学部材であって、前記導電部の少なくとも一部が両面粘着シートに接している光学部材。
- 透明支持体上の一部に導電部が設けられた導電部材、請求項1~7のいずれか1項に記載の両面粘着シート、透明基材層、ハードコート層を順に積層した光学部材であって、前記導電部の少なくとも一部が両面粘着シートに接している光学部材。
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JP6388025B2 (ja) | 2018-09-12 |
TWI686454B (zh) | 2020-03-01 |
JPWO2015146664A1 (ja) | 2017-04-13 |
KR101948531B1 (ko) | 2019-02-15 |
TW201538658A (zh) | 2015-10-16 |
CN106170522A (zh) | 2016-11-30 |
KR20160132101A (ko) | 2016-11-16 |
CN106170522B (zh) | 2020-10-09 |
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