WO2016043268A1 - 光架橋性透明粘着材、透明粘着材積層体及び光学装置構成用積層体 - Google Patents
光架橋性透明粘着材、透明粘着材積層体及び光学装置構成用積層体 Download PDFInfo
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- WO2016043268A1 WO2016043268A1 PCT/JP2015/076480 JP2015076480W WO2016043268A1 WO 2016043268 A1 WO2016043268 A1 WO 2016043268A1 JP 2015076480 W JP2015076480 W JP 2015076480W WO 2016043268 A1 WO2016043268 A1 WO 2016043268A1
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- adhesive material
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- B32B2307/7246—Water vapor barrier
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- B32B2457/00—Electrical equipment
- B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
- B32B2457/208—Touch screens
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F222/00—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 a carboxyl radical and containing at least one other carboxyl radical in the molecule; Salts, anhydrides, esters, amides, imides, or nitriles thereof
- C08F222/10—Esters
- C08F222/1006—Esters of polyhydric alcohols or polyhydric phenols
- C08F222/102—Esters of polyhydric alcohols or polyhydric phenols of dialcohols, e.g. ethylene glycol di(meth)acrylate or 1,4-butanediol dimethacrylate
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/06—Polyethene
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- 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
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
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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
- C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
- C09J2301/12—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers
- C09J2301/124—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present on both sides of the carrier, e.g. double-sided adhesive tape
- C09J2301/1242—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present on both sides of the carrier, e.g. double-sided adhesive tape the opposite adhesive layers being different
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
- C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature
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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
- C09J2301/416—Additional features of adhesives in the form of films or foils characterized by the presence of essential components use of irradiation
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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
- C09J2423/00—Presence of polyolefin
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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
- C09J2423/00—Presence of polyolefin
- C09J2423/04—Presence of homo or copolymers of ethene
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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
Definitions
- the present invention relates to a transparent adhesive material having a low dielectric constant and excellent adhesive properties.
- optical devices such as mobile terminals (PDA) such as smartphones, tablets, personal computers, game machines, televisions (TVs), car navigation systems, touch panels, pen tablets, organic EL elements, organic thin films, dye sensitization, etc.
- PDA mobile terminals
- TVs televisions
- car navigation systems touch panels
- pen tablets organic EL elements
- organic thin films organic thin films
- dye sensitization etc.
- the present invention relates to a transparent adhesive material that can be suitably used for bonding devices such as solar cell modules and members constituting the module, and a transparent adhesive material laminate and an optical device constituting laminate using the same.
- an image display panel such as a liquid crystal display (LCD), a plasma display (PDP), or an electroluminescence display (ELD) and a protection disposed on the front side (viewing side) in order to improve the visibility of the optical device.
- LCD liquid crystal display
- PDP plasma display
- ELD electroluminescence display
- a gap between the panel and the touch panel member has been filled with an adhesive sheet, a liquid adhesive, or the like to suppress reflection of incident light or outgoing light from a display image at the air layer interface.
- Patent Document 1 As a method for filling the gaps between components for optical devices with a pressure-sensitive adhesive, there is known a method in which a liquid adhesive resin composition containing an ultraviolet curable resin is filled into the gaps and then cured by irradiation with ultraviolet rays. It was. (Patent Document 1)
- the pressure-sensitive adhesive sheet used for filling between the electrode and the surface protection panel needs to have a low dielectric constant in order to absorb the change in touch detection sensitivity associated with the thinning of the member and itself.
- the electrode substrate has been replaced from a resin film to glass. In the case of an electrode in which a conductive thin film is patterned only on one side, it is necessary to laminate two film electrodes, or a glass electrode and a film electrode with an adhesive sheet or the like. A low dielectric constant is required.
- Patent Document 2 a composition comprising a monomer component containing a specific (meth) acrylic acid alkyl ester having a relatively long chain alkyl group or alicyclic hydrocarbon group An optical pressure-sensitive adhesive sheet using the above is disclosed.
- Patent Document 3 discloses a low-dielectric-constant adhesive that uses an acrylic ester copolymer obtained by copolymerizing a methacrylic ester monomer having a specific carbon number range in its side chain, and is particularly suitable for bonding touch panels. A composition is disclosed.
- Patent Document 4 as an adhesive sheet composition capable of forming an adhesive sheet having a low dielectric constant and a low dielectric loss tangent, an adhesive containing polyphenylene ether, an elastomer made of a styrene butadiene copolymer, and triallyl isocyanurate is disclosed. Sheet compositions are disclosed.
- Patent Document 5 discloses a polyphenylene ether-based polymer having a hydroxyl group in its chemical structure and having 2,6-dimethylphenylene ether as a repeating unit, an isocyanate compound having a plurality of isocyanate groups in the structure, and hydrogenation.
- a thermoplastic resin composition containing any one of these styrenic elastomers or a reaction product thereof is disclosed.
- Olefin polymers such as polyethylene and polypropylene that do not have large polar groups are known to have excellent dielectric properties due to their low electrical properties, particularly relative dielectric constant. For this reason, it is known that an adhesive material containing the above-mentioned olefin polymer as a main component exhibits excellent dielectric properties. However, since the adhesive material mainly composed of an olefin polymer generally does not have a very high adhesive force, the adhesiveness with the adherend is not sufficient particularly for bonding the components of the optical device as described above. there were.
- an adhesive layer mainly composed of an acrylic polymer is laminated on one side or both sides of a resin layer mainly composed of an olefin polymer.
- a resin layer composed mainly of an olefin polymer and an adhesive layer composed mainly of an acrylic polymer are laminated. Even if it tried, it had the subject that it was difficult to integrate.
- the present invention provides an acrylic polymer on one or both sides of a resin layer containing an olefin polymer as a main component in order to provide a transparent adhesive material having a low relative dielectric constant and excellent adhesive properties.
- a transparent adhesive material having a structure in which an adhesive layer containing as a main component is laminated, and a resin layer mainly containing an olefin polymer and an adhesive layer containing an acrylic polymer as a main component are suitably integrated. It is intended to provide a new transparent adhesive material that can be transformed into a transparent adhesive.
- the present invention provides a transparent adhesive material comprising an outermost layer containing an acrylic polymer (B) and a photocrosslinking initiator, and an intermediate layer containing an olefin polymer (A), a crosslinking agent and a photocrosslinking initiator.
- middle layer proposes the photocrosslinkable transparent adhesive material characterized by containing a (meth) acrylate monomer as said crosslinking agent.
- the present invention also provides a transparent adhesive comprising an outermost layer containing a photoreaction product of an acrylic polymer (B) and an intermediate layer containing a photoreaction product of an olefin polymer (A) adjacent thereto.
- a transparent adhesive material is proposed which has a relative dielectric constant of 3.3 or less at a frequency of 100 kHz to 1 MHz.
- the relative dielectric constant of the entire adhesive material can be lowered by using the intermediate layer containing the olefin polymer (A). Moreover, since the outermost layer containing the acrylic polymer (B) and the photocrosslinking initiator is provided, the adhesive property is improved as compared with the single-layer adhesive material mainly composed of the olefin polymer (A). Even in the past, it can be used for bonding optical device constituent members.
- the photocrosslinkable transparent adhesive material proposed by the present invention contains the 130 ° C. melt viscosity of the resin composition constituting the intermediate layer containing the olefin polymer (A) and the acrylic polymer (B). By adjusting it to a predetermined range with that of the resin composition constituting the outermost layer, it can be heated and melted at the same temperature, for example, it becomes possible to co-extrusion, and the interfacial adhesion between both layers can be improved. it can.
- the (meth) acrylate monomer in the intermediate layer diffuses and penetrates into the outermost layer containing the acrylic polymer (B) by containing the (meth) acrylate monomer as a crosslinking agent in the intermediate layer.
- the crosslinking reaction proceeds by irradiating light, the cross-linking agent contained in the intermediate layer reacts and the outermost layer interacts, so that the interfacial adhesion between both layers can be further enhanced.
- the photocrosslinkable transparent adhesive material (hereinafter referred to as “the present transparent adhesive material”) according to this embodiment includes an outermost layer containing an acrylic polymer (B) and a photocrosslinking initiator, and an olefin polymer (A). And a transparent adhesive material comprising an intermediate layer containing a crosslinking agent and a photocrosslinking initiator.
- the resin composition constituting the outermost layer and the intermediate layer has a 130 ° C. melt viscosity ⁇ of 5 ⁇ 10 1 to 5 ⁇ 10 3 Pa ⁇ s, and the outermost layer melt viscosity ⁇ a
- the ratio ⁇ a / ⁇ b of the intermediate layer melt viscosity ⁇ b is preferably 0.05 to 20.
- 130 ° C. melt viscosity ⁇ b of the resin composition constituting the intermediate layer containing the olefin polymer (A), and ⁇ a of the resin composition constituting the outermost layer containing the acrylic polymer (B) By adjusting the value within a predetermined range, the same viscosity characteristics will be exhibited at the same temperature.
- the 130 ° C. melt viscosity ⁇ of the resin composition constituting the outermost layer and the intermediate layer is preferably 5 ⁇ 10 1 to 5 ⁇ 10 3 Pa ⁇ s. If it is 5 ⁇ 10 1 Pa ⁇ s or more, it is easy to form a sheet while heating, and if it is 5 ⁇ 10 3 Pa ⁇ s or less, adhesion between layers can be maintained, and stacking and integration are easy. This is preferable. Among them, the 130 ° C.
- melt viscosity ⁇ is 7 ⁇ 10 1 Pa ⁇ s or more or 3 ⁇ 10 3 Pa ⁇ s or less, and more preferably 1 ⁇ 10 2 Pa ⁇ s or more or 1 ⁇ 10 3 Pa ⁇ s or less. Is particularly preferred.
- the ratio ⁇ a / ⁇ b of the outermost layer melt viscosity ⁇ a and the intermediate layer melt viscosity ⁇ b of the resin composition constituting the outermost layer and the intermediate layer is 0.05 to 20.
- 0.07 or more and 15 or less, particularly 0.1 or more and 10 or less, and more preferably 0.2 or more or 5 or less are particularly preferable.
- the 130 ° C melt viscosity of the resin composition constituting the intermediate layer containing the olefin polymer (A) and the 130 ° C melt viscosity of the resin composition constituting the outermost layer containing the acrylic polymer (B) As one of the adjustment methods, there can be mentioned a method of adjusting the molecular weights of the resin as the main component of each resin composition, that is, the olefin polymer (A) and the acrylic polymer (B). From this viewpoint, the olefin polymer (A) has a weight average molecular weight (Mw) of 50,000 to 400,000, particularly 60,000 or more and 200,000 or less, and particularly preferably 70,000 or more and 150,000 or less.
- Mw weight average molecular weight
- the acrylic polymer (B) has a weight average molecular weight (Mw) of 100,000 to 800,000, more preferably 150,000 or more and 550,000 or less, and particularly preferably 200,000 or more and 500,000 or less.
- Mw weight average molecular weight
- the melt viscosity may be adjusted by increasing or decreasing the amount of additive components such as a crosslinking agent and a photocrosslinking initiator. The composition of the preferred additive component and the amount of addition will be described later.
- An intermediate layer is a layer containing an olefin polymer (A), a crosslinking agent, and a photocrosslinking initiator at least.
- This intermediate layer preferably has a relative dielectric constant of 3.0 or less at a frequency of 100 kHz to 1 MHz or less.
- the relative dielectric constant of the intermediate layer is preferably 3.0 or less, particularly 2.8 or less, particularly 2.6 or less at a frequency of 100 kHz to 1 MHz or less.
- Olefin polymer (A) examples include an ethylene- ⁇ -olefin copolymer, a styrene elastomer, a polyisobutylene resin, a polybutene resin, a polybutadiene resin, a polyisoprene resin, and an ethylene / cyclic olefin copolymer. Of these, it is preferable to use one or a combination of two or more.
- transparent adhesive materials among ethylene- ⁇ -olefin copolymers, styrene elastomers and polyisobutylene resins It is particularly preferable to use any one of these or a combination of two or more. In this case, two or more types of olefin polymers having different compositions and molecular weights can be used in combination.
- the “ethylene- ⁇ -olefin copolymer” may be a copolymer of ethylene and ⁇ -olefin.
- the type of ⁇ -olefin copolymerized with ethylene is not particularly limited.
- ⁇ -olefins having 3 to 20 carbon atoms can be suitably used.
- propylene, 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, 3-methyl-butene-1, 4-methyl-pentene-1, etc. Can be mentioned.
- a copolymer having 1-butene, 1-hexene, or 1-octene as a copolymer component as the ⁇ -olefin is preferable.
- only one ⁇ -olefin copolymerized with ethylene may be used alone, or two or more types may be used in combination at any ratio.
- the content of ⁇ -olefin copolymerized with ethylene is not particularly limited. For example, it is preferably 2 mol% to 40 mol%, more preferably 3 mol% or more or 30 mol% or less, and more preferably 5 mol% or more or 25 mol% or less, based on the entire monomer used for copolymerization. preferable. If the content of the ⁇ -olefin copolymerized with ethylene is within the above range, it is preferable because crystallinity is reduced by the copolymer component and transparency (for example, total light transmittance, haze, etc.) is improved.
- the content of the ⁇ -olefin copolymerized with ethylene is in the above-mentioned range since the generation of blocking is suppressed when producing raw material pellets.
- the type and content of ⁇ -olefin copolymerized with ethylene can be analyzed by a known method, for example, a nuclear magnetic resonance (NMR) measuring device or other instrumental analyzer.
- the ethylene- ⁇ -olefin copolymer may contain monomer units based on monomers other than ⁇ -olefin.
- the monomer unit include cyclic olefins, vinyl aromatic compounds (such as styrene), polyene compounds, and the like.
- the content of the monomer units is preferably 20 mol% or less, more preferably 15 mol% or less, based on 100 mol% of all monomer units in the ethylene- ⁇ -olefin copolymer. is there.
- the steric structure, branching, branching degree distribution, molecular weight distribution and copolymerization form (random, block, etc.) of the ethylene- ⁇ -olefin copolymer are not particularly limited, but have, for example, long chain branching.
- Copolymers that is, copolymers having a branch in the main chain itself, generally have good mechanical properties, and the melt tension (melt tension) at the time of forming a film is increased, thereby improving the calendar moldability.
- the ethylene- ⁇ -olefin copolymer may or may not have a crystal melting peak.
- the upper limit of the crystal melting peak temperature is not particularly limited. In consideration of transparency and low temperature flexibility, the temperature is preferably 100 ° C. or lower, more preferably 80 ° C. or lower, and further preferably 65 ° C. or lower. Further, the lower limit of the crystal melting peak temperature is preferably 20 ° C. or higher, more preferably 30 ° C. or higher, further preferably 40 ° C. in consideration of blocking prevention of raw material pellets, handling property of the adhesive, shape retention performance at room temperature, and the like. It is above °C. There may be a plurality of crystal melting peak temperatures.
- the heat of crystal melting of the ethylene- ⁇ -olefin copolymer is not particularly limited. Preferably, it is 0 to 100 J / g, especially 5 J / g or more or 80 J / g or less, and more preferably 10 J / g or more or 65 J / g or less. If it is in the said range, since a softness
- the crystal melting peak temperature and the crystal melting calorie can be measured at a heating rate of 10 ° C./min according to JIS K7121 using a differential scanning calorimeter (DSC).
- the MFR (JIS K7210: temperature 190 ° C., load 21.18 N) of the ethylene- ⁇ -olefin copolymer is not particularly limited. It is preferably 5 g / 10 min to 60 g / 10 min, particularly 8 g / 10 min or more or 50 g / 10 min or less, and more preferably 10 g / 10 min or more or 45 g / 10 min or less.
- the ethylene- ⁇ -olefin copolymer is preferably an ethylene- ⁇ -olefin copolymer having a density of 0.850 to 0.900 g / cm 3 in order to impart excellent transparency and low temperature characteristics.
- An ethylene- ⁇ -olefin copolymer (linear low density polyethylene) of 0.860 to 0.885 g / cm 3 is more preferred.
- ethylene- ⁇ -olefin copolymers an ethylene- ⁇ -olefin random copolymer is more preferable from the viewpoint of low crystallinity and excellent light transmittance and flexibility. These may be used alone or in a combination of two or more.
- the method for producing the ethylene- ⁇ -olefin copolymer is not particularly limited, and a known polymerization method using a known ethylene polymerization catalyst can be employed.
- Known polymerization methods include, for example, a slurry polymerization method, a solution polymerization method, a gas polymerization method using a multi-site catalyst typified by a Ziegler-Natta type catalyst, or a single-site catalyst typified by a metallocene catalyst or a post metallocene catalyst. Examples thereof include a phase polymerization method and a bulk polymerization method using a radical initiator.
- polystyrene elastomer examples include SBR (styrene-butadiene rubber), SIB (styrene-isobutylene rubber), SBS (styrene-butylene-styrene block copolymer), and SIS (styrene-isobutylene-styrene block copolymer).
- SBR styrene-butadiene rubber
- SIB styrene-isobutylene rubber
- SBS styrene-butylene-styrene block copolymer
- SIS styrene-isobutylene-styrene block copolymer
- Polymer SEBS (styrene-ethylene-butylene-styrene block copolymer), SEBC (styrene-ethylene-butylene-ethylene block copolymer), SIB (styrene-isobutylene block copolymer), HS
- the styrene content in the styrene elastomer is not particularly limited.
- 20 mol% or less is preferable with respect to all monomer components constituting the elastomer.
- the MFR (JIS K7210: temperature 190 ° C., load 21.18 N) of the above styrene elastomer is not particularly limited. It is preferably 5 g / 10 min to 100 g / 10 min, particularly 8 g / 10 min or more or 80 g / 10 min or less, and more preferably 10 g / 10 min or more or 50 g / 10 min or less.
- polyisobutylene resin may be a resin having a polyisobutylene skeleton in the main chain or side chain.
- examples thereof include homopolymers of isobutylene monomers, copolymers of isobutylene and a small amount of isoprene, copolymers of isobutylene and n-butane or butadiene.
- the viscosity average molecular weight (Mv) of the polyisobutylene resin is not particularly limited. It is preferably 50,000 to 400,000, more preferably 70,000 or more and 300,000 or less, and more preferably 100,000 or more or 200,000 or less. By setting the viscosity average molecular weight (Mv) in the above range, it becomes easy to achieve both workability, sheet shape stability, practical heat resistance, and the like.
- the olefin polymer (A) may have a functional group.
- compatibility with additives such as a crosslinking agent, a photocrosslinking initiator, and an antioxidant can be improved, and adhesion to an adherend and other layers can be achieved. Strength can be improved.
- these may be used alone or in combination with an olefin polymer having no functional group, but in consideration of molding processability, economy, etc. when forming into a sheet, the functional group is It is preferable to use it together with an olefin polymer which does not exist.
- olefin polymers having functional groups include silane-modified olefin polymers, acid-modified olefin polymers, ethylene-vinyl acetate copolymer (EVA), ethylene-vinyl alcohol copolymer (EVOH), and ethylene-methyl. It is at least one resin selected from the group consisting of a methacrylate copolymer (E-MMA), an ethylene-ethyl acrylate copolymer (E-EAA), and an ethylene-glycidyl methacrylate copolymer (E-GMA). It is preferable.
- E-MMA methacrylate copolymer
- E-EAA ethylene-ethyl acrylate copolymer
- E-GMA ethylene-glycidyl methacrylate copolymer
- the intermediate layer preferably contains a crosslinking agent and a photocrosslinking initiator. If the intermediate layer contains a cross-linking agent and a photo-crosslinking initiator, the cross-linking reaction with the olefin polymer (A) or a network is formed between the cross-linking agents to improve the storage elastic modulus G ′. Can improve practical durability. For example, in a long-term reliability test, reflow, deviation between adherends, peeling, foaming, and the like can be suppressed.
- the (meth) acrylate monomer is contained in the intermediate layer as a crosslinking agent.
- a (meth) acrylate monomer as a cross-linking agent in the intermediate layer, the (meth) acrylate monomer in the intermediate layer diffuses and penetrates into the outermost layer containing the acrylic polymer (B), or transmits light.
- the crosslinking reaction proceeds by irradiation, the cross-linking agent contained in the intermediate layer reacts and the outermost layer interacts, so that the interfacial adhesion between the two layers can be further enhanced.
- both the outermost layer and the intermediate layer contain a (meth) acrylate monomer as a cross-linking agent, and the concentration of the (meth) acrylate monomer in the intermediate layer is higher than that of the outermost layer.
- the (meth) acrylate monomer in the intermediate layer is more easily diffused and penetrated into the outermost layer, so that the interfacial adhesion between both layers can be further enhanced.
- the crosslinking agent used for the intermediate layer is not particularly limited.
- various monofunctional and bifunctional or more polyfunctional crosslinking agents such as vinyl ester and (meth) acrylic acid ester capable of radical crosslinking reaction can be used.
- vinyl ester and (meth) acrylic acid ester capable of radical crosslinking reaction can be used.
- the content of the crosslinking agent is 1 to 50 parts by mass, preferably 1 to 20 parts by mass, more preferably 1 to 10 parts by mass with respect to 100 parts by mass of the olefin polymer.
- crosslinking agent used in the intermediate layer include, for example, isobornyl (meth) acrylate, lauryl (meth) acrylate, stearyl (meth) acrylate, 1,6-hexanediol di (meth) acrylate, and 1,8-octanediol diester.
- These cross-linking agents may be used alone or in combination. When using multiple types of crosslinking agents, it is preferable to use a combination of monofunctional (meth) acrylate and polyfunctional (meth) acrylate. Thereby, shrinkage
- the photocrosslinking initiator of the intermediate layer can be used as a role of a radical generator for causing the crosslinking agent to undergo a radical crosslinking reaction when irradiated with light through the adherend after the adhesive material is bonded.
- a photocrosslinking initiator By using a photocrosslinking initiator, it can be photocured in a short time at a low temperature. For this reason, it is possible to sufficiently avoid damage to the optical device constituent member that is the adherent member.
- the photo-crosslinking initiator can be used alone or in combination of two or more of a cleavage type photo-crosslinking initiator and a hydrogen abstraction type photo-crosslinking initiator capable of initiating reaction with ultraviolet light or visible light. is there.
- the kind of the photocrosslinking initiator is not particularly limited.
- Examples of the cleavage type photocrosslinking initiator include benzoisobutyl ether, benzyl methyl ketal, 2-hydroxyacetophenone, and the like.
- Examples of the hydrogen abstraction type photocrosslinking initiator include benzophenone, Michler's ketone, 2-ethylanthraquinone, thioxanthone and derivatives thereof.
- the content of the photocrosslinking initiator is preferably 0.3 to 10 parts by weight, more preferably 0.5 parts by weight or more and 3 parts by weight or less, with respect to 100 parts by weight of the olefin polymer (A). More preferably, it is 5 parts by mass or less.
- the composition constituting the intermediate layer is made of the olefin polymer (A), crosslinked, for the purpose of further improving physical properties (flexibility, heat resistance, transparency, adhesiveness, etc.), molding processability, economic efficiency, and the like.
- Resins other than the agent and the photocrosslinking initiator can be included.
- an ionomer resin, a tackifier resin, etc. can be mentioned.
- ionomer resin examples include ionic crosslinkable ethylene-methacrylic acid copolymers and ionic crosslinkable ethylene-acrylic acid copolymers.
- the manufacturing method is not particularly limited. For example, at least a part of an unsaturated carboxylic acid component of a copolymer comprising ethylene, an unsaturated carboxylic acid, and another unsaturated compound as an optional component is neutralized with at least one of a metal ion and an organic amine. Can be obtained.
- the ionomer resin can also be obtained, for example, by saponifying at least a part of an unsaturated carboxylic acid ester component of a copolymer comprising ethylene, an unsaturated carboxylic acid ester, and an optional other unsaturated compound.
- saponifying at least a part of an unsaturated carboxylic acid ester component of a copolymer comprising ethylene, an unsaturated carboxylic acid ester, and an optional other unsaturated compound can do.
- trade name “HIMILAN” manufactured by Mitsui DuPont Polychemical Co., Ltd. can be exemplified.
- Examples of the “tackifying resin” include petroleum resins, terpene resins, coumarone-indene resins, rosin resins, and hydrogenated derivatives thereof.
- examples of the petroleum resin include an alicyclic petroleum resin from cyclopentadiene or a dimer thereof and an aromatic petroleum resin from the C9 component.
- examples of the terpene resin include terpene resins derived from ⁇ -pinene and terpene-phenol resins.
- Examples of the coumarone-indene resin include a coumarone-indene copolymer and a coumarone-indene-styrene copolymer.
- rosin resin examples include rosin resins such as gum rosin and wood rosin, and esterified rosin resins modified with glycerin, pentaerythritol, and the like.
- the content of the tackifying resin is preferably 20 parts by mass or less, more preferably 10 parts by mass or less, with respect to 100 parts by mass of the resin composition constituting the intermediate layer.
- additives can be added to the intermediate layer as necessary.
- the additive include a silane coupling agent, an antioxidant, a weathering stabilizer, a processing aid, a nucleating agent, an ultraviolet absorber, a flame retardant, and a discoloration preventing agent. These additives may be used alone or in combination of two or more. Of these, silane coupling agents, antioxidants, weathering stabilizers, and processing aids will be described later.
- silane coupling agent is useful for improving the adhesion with the outermost layer or a peripheral member constituting the optical device, for example, an unsaturated group such as a vinyl group, an acryloxy group, a methacryloxy group, an amino group, A compound having a hydrolyzable functional group such as an alkoxy group together with an epoxy group can be exemplified.
- Specific examples of the silane coupling agent include N- ( ⁇ -aminoethyl) - ⁇ -aminopropyltrimethoxysilane, N- ( ⁇ -aminoethyl) - ⁇ -aminopropylmethyldimethoxysilane, and ⁇ -aminopropyltriethoxy.
- Examples thereof include silane, ⁇ -glycidoxypropyltrimethoxysilane, and ⁇ -methacryloxypropyltrimethoxysilane.
- ⁇ -glycidoxypropyltrimethoxysilane and ⁇ -methacryloxypropyltrimethoxysilane are preferably used because of good adhesiveness and little discoloration such as yellowing.
- the said silane coupling agent can be used individually by 1 type or in combination of 2 or more types.
- the amount of the silane coupling agent added is preferably about 0.1 to 5 parts by mass, more preferably 0.2 to 3 parts by mass with respect to 100 parts by mass of the resin composition constituting the intermediate layer.
- a coupling agent such as an organic titanate compound can also be used effectively.
- the antioxidant is not particularly limited, and various commercially available products can be applied.
- examples of the antioxidant include various types such as phenol, sulfur, phosphite, such as monophenol, bisphenol, and high-molecular phenol.
- monophenol antioxidants examples include 2,6-di-tert-butyl-p-cresol, butylated hydroxyanisole, 2,6-di-tert-butyl-4-ethylphenol, octadecyl-3- And (3,5-di-tert-butyl-4-hydroxyphenyl) propionate.
- bisphenol antioxidants examples include 2,2′-methylene-bis- (4-methyl-6-tert-butylphenol) and 2,2′-methylene-bis- (4-ethyl-6-tert-butylphenol). ), 4,4′-thiobis- (3-methyl-6-tert-butylphenol), 4,4′-butylidene-bis- (3-methyl-6-tert-butylphenol), 3,9-bis [ ⁇ 1 , 1-dimethyl-2- ⁇ - (3-tert-butyl-4-hydroxy-5-methylphenyl) propionyloxy ⁇ ethyl ⁇ 2,4,9,10-tetraoxaspiro] 5,5-undecane, etc. Can be mentioned.
- polymeric phenolic antioxidant examples include 1,1,3-tris- (2-methyl-4-hydroxy-5-tert-butylphenyl) butane, 1,3,5-trimethyl-2,4. , 6-Tris (3,5-di-tert-butyl-4-bidoxybenzyl) benzene, tetrakis- ⁇ methylene-3- (3 ', 5'-di-tert-butyl-4'-hydroxyphenyl) Propionate ⁇ methane, bis ⁇ (3,3′-bis-4′-hydroxy-3′-tert-butylphenyl) butyric acid ⁇ glycol ester, 1,3,5-tris (3 ′, 5′-di) -Tert-butyl-4'-hydroxybenzyl) -s-triazine-2,4,6- (1H, 3H, 5H) trione, tocopherol (vitamin E) and the like.
- sulfur-based antioxidants examples include dilauryl thiodipropionate, dimyristyl thiodipropionate, and distearyl thiopropionate.
- phosphite antioxidant examples include triphenyl phosphite, diphenylisodecyl phosphite, phenyl diisodecyl phosphite, 4,4′-butylidene-bis (3-methyl-6-tert-butylphenyl-di-tridecyl) ) Phosphite, cyclic neopentanetetrayl bis (octadecyl phosphite), tris (mono and / or dinonylphenyl) phosphite, tris (2,4-di-tert-butylphenyl) phosphite, diisodecyl pentaerythritol di Phosphite, 9,10-dihydro-9-oxa-10-phosphaphenalene-10-oxide, 10- (3,5-di-tert-butyl-4-hydroxybenzyl) -9,10-
- phenol-based and phosphite-based antioxidants are preferably used from the viewpoints of the effect of the antioxidant, thermal stability, economy, and the like. It is more preferable to use both in combination because the effect as an antioxidant with respect to the amount added can be enhanced.
- the amount of antioxidant added is not particularly limited.
- it is preferably 0.1 parts by mass to 1 part by mass, and more preferably 0.2 parts by mass or more or 0.5 parts by mass or less. preferable.
- a hindered amine light stabilizer As a weather stabilizer for imparting weather resistance, a hindered amine light stabilizer is preferably used.
- hindered amine light stabilizers include dimethyl succinate-1- (2-hydroxyethyl) -4-hydroxy-2,2,6,6-tetramethylpiperidine polycondensate, poly [ ⁇ 6- (1 , 1,3,3-tetramethylbutyl) amino-1,3,5-triazine-2,4-diyl ⁇ ⁇ (2,2,6,6-tetramethyl-4-piperidyl) imino ⁇ hexamethylene ⁇ 2,2,6,6-tetramethyl-4-piperidyl ⁇ imino ⁇ ], N, N′-bis (3-aminopropyl) ethylenediamine-2,4-bis [N-butyl-N- (1,2,2, 2,6,6-pentamethyl-4-piperidyl) amino] -6-chloro-1,3,5-triazine condensate, bis (2,
- the amount of the weather stabilizer added is not limited, but is preferably 0.01 parts by mass or more and 1 part by mass or less, more preferably 0. 0 parts by mass with respect to 100 parts by mass of the resin composition constituting the intermediate layer. It is 05 parts by mass or more and 0.5 parts by mass or less.
- the processing aid can be used for adjusting the fine adhesion of the intermediate layer and adjusting the flow during heating and melting. For example, it is possible to appropriately select and add paraffin oil, inorganic or organic nanoparticles, etc., as long as the transparency is not excluded.
- the outermost layer is a layer containing an acrylic polymer (B) and a photocrosslinking initiator, and is preferably a layer that can exhibit adhesiveness.
- the outermost layer preferably has a higher dielectric constant at a frequency of 100 kHz to 1 MHz than that of the intermediate layer.
- an acrylic polymer (B) what is necessary is just an acrylic polymer contained in a well-known adhesion composition. Among these, it is preferable to contain as a main component a polymer obtained by copolymerizing a (meth) acrylic acid ester monomer and / or a vinyl ether monomer having an alkyl group.
- an acrylic polymer particularly a (meth) acrylic acid ester polymer (including a copolymer) as the base polymer.
- acrylic monomers and methacrylic monomers used to synthesize (meth) acrylic acid ester polymers include 2-ethylhexyl acrylate, n-octyl acrylate, n-butyl acrylate, and ethyl acrylate.
- These main monomers include cross-linkable monomers such as hydroxyethyl acrylate, acrylic acid, itaconic acid, glycidyl acrylate, glycidyl methacrylate, methylol acrylamide, maleic anhydride, methyl methacrylate, methyl acrylate, acrylamide, acrylonitrile, methacrylonitrile, vinyl acetate.
- Highly agglomerated monomers and functional group-containing monomers such as styrene, fluorine acrylate, and silicone acrylate can be appropriately added.
- These monomers are polymerized by a known polymerization method such as solution polymerization, emulsion polymerization, bulk polymerization or suspension polymerization.
- a polymerization initiator such as a thermal polymerization initiator or a photocrosslinking initiator may be used depending on the polymerization method.
- a cross-linking agent may be added to the outermost layer.
- the crosslinking agent include (meth) acrylic crosslinking agents, isocyanate crosslinking agents, epoxy crosslinking agents, and the like, and these can be used alone or in combination. Among them, in view of compatibility with the acrylic copolymer, it is preferable to use an acrylic crosslinking agent, and it is more preferable to use an acrylic monomer having a weight average molecular weight (Mw) of 5000 or less.
- Mw weight average molecular weight
- a crosslinking agent is not limited to the (meth) acrylate illustrated below, For example, the (meth) acrylate monomer etc. which contained the organic functional group etc. can be used suitably.
- polyfunctional (meth) acrylates such as bifunctional (meth) acrylate, trifunctional (meth) acrylate, and tetrafunctional (meth) acrylate are preferable to monofunctional (meth) acrylate.
- a mixture in which two or more of monofunctional to tetrafunctional (meth) acrylates are mixed is preferable.
- Monofunctional (meth) acrylates include (meth) acrylic acids such as acrylic acid, methacrylic acid, and crotonic acid, lauryl acrylate, 2-ethylhexyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, and tetrahydrofurfuryl. Examples include acrylate, 1,6-hexanediol monoacrylate, and dicyclopentanediene acrylate.
- Examples of the bifunctional (meth) acrylate include 1,3-propanediol diacrylate, 1,4-butanediol diacrylate, 1,6-hexanediol diacrylate, 1,9-nonanediol diacrylate, diethylene glycol diacrylate, Examples include polyethylene glycol 400 diacrylate and tripropylene glycol diacrylate.
- Examples of trifunctional (meth) acrylates include triacrylates such as pentaerythritol triacrylate, trimethylolpropane triacrylate, trimethylolpropane PO-modified triacrylate, trimethylolpropane EO-modified triacrylate, and trimethacrylates thereof. Can do.
- Examples of the tetrafunctional (meth) acrylate include ditrimethylolpropane tetraacrylate and pentaerythritol tetraacrylate.
- Isocyanate-based crosslinking agents include, for example, isocyanate monomers such as tolylene diisocyanate, chlorophenylene diisocyanate, hexamethylene diisocyanate, tetramethylene diisocyanate, isophorone diisocyanate, xylylene diisocyanate, diphenylmethane diisocyanate, and hydrogenated diphenylmethane diisocyanate.
- isocyanate monomers such as tolylene diisocyanate, chlorophenylene diisocyanate, hexamethylene diisocyanate, tetramethylene diisocyanate, isophorone diisocyanate, xylylene diisocyanate, diphenylmethane diisocyanate, and hydrogenated diphenylmethane diisocyanate.
- epoxy-based crosslinking agent examples include ethylene glycol glycidyl ether, polyethylene glycol diglycidyl ether, glycerin diglycidyl ether, glycerin triglycidyl ether, 1,3-bis (N, N-diglycidylaminomethyl) cyclohexane, N, N, N ′, N′-tetraglycidyl-m-xylylenediamine, N, N, N ′, N′-tetraglycidylaminophenylmethane, triglycidyl isocyanurate, m-N, N-diglycidylaminophenylglycidyl ether, N , N-diglycidyl toluidine, N, N-diglycidyl aniline and the like.
- aziridine crosslinking agents examples include diphenylmethane-4,4′-bis (1-aziridinecarboxamide), trimethylolpropane tri- ⁇ -aziridinylpropionate, tetramethylolmethanetri- ⁇ -aziridinyl Propionate, toluene-2,4-bis (1-aziridinecarboxamide), triethylenemelamine, bisisophthaloyl-1- (2-methylaziridine), tris-1- (2-methylaziridine) phosphine, And trimethylolpropane tri- ⁇ - (2 methylaziridine) propionate.
- the addition amount of the crosslinking agent is preferably 0.5 to 25 parts by mass with respect to 100 parts by mass of the base polymer.
- Photocrosslinking initiator As the photocrosslinking initiator used for the outermost layer, as in the case of the intermediate layer, either a cleavage type photocrosslinking initiator or a hydrogen abstraction type photocrosslinking initiator can be used. preferable.
- Examples of the hydrogen abstraction type photocrosslinking initiator include benzophenone, Michler's ketone, dibenzosuberone, 2-ethylanthraquinone, isobutylthioxanthone and the like, or a derivative thereof, or a mixed component composed of a combination of two or more of these. Can be used.
- the hydrogen abstraction type photocrosslinking initiator is not limited to the materials listed above. Further, the hydrogen abstraction type and the cleavage type may be used in various proportions.
- the content of the photocrosslinking initiator is not particularly limited, and is generally adjusted within a range of 0.1 to 5 parts by mass with respect to 100 parts by mass of the base polymer. However, this range may be exceeded in balance with other elements.
- the outermost layer may contain an ionomer resin, a tackifier resin, a crosslinking agent, a photocrosslinking initiator, a silane coupling agent, an antioxidant, a weathering stabilizer, a processing aid, and the like. .
- the outermost layer contains a crosslinking agent and / or a photocrosslinking initiator.
- the present transparent adhesive material is characterized by having a structure in which each of the intermediate layer and the outermost layer has one or more layers, and these layers are laminated and integrated.
- the laminated structure include a two-layer structure of intermediate layer / outermost layer and a two-layer / three-layer structure of outermost layer / intermediate layer / outermost layer. Further, the number of layers may be increased as necessary to 4 layers, 5 layers, 6 layers, and 7 layers. Above all, in order to achieve both required electrical properties and various required properties such as tackiness and adhesion strength to the adherend, the outermost layer / intermediate layer / outermost layer, two-layer / three-layer configuration having an intermediate layer having a low dielectric constant Is preferred.
- the value of the intermediate layer (total thickness when there are two or more intermediate layers) / outermost layer (total thickness when there are two outermost layers) is 0.05 to It is preferably 20, more preferably 0.1 or more and 15 or less, and particularly preferably 0.5 or more and 12 or less.
- the value of the intermediate layer / outermost layer is within the above range, various required characteristics can be easily balanced.
- transparent inorganic oxide film layers such as SiO 2 and Al 2 O 3 , barrier film layers, and retardation film layers for displays.
- Sheet thickness As a minimum of the thickness of this transparent adhesive material, 10 micrometers or more are preferable, 30 micrometers or more are more preferable, and 50 micrometers or more are further more preferable. As an upper limit, 1 mm or less is preferable, 500 micrometers or less are more preferable, and 250 micrometers or less are further more preferable.
- the adhesive sheet functions as an insulating layer.
- the adhesive material is required to have a low relative dielectric constant.
- the present transparent adhesive material preferably has a relative dielectric constant of 3.3 or less, particularly 3.0 or less, and more preferably 2.8 or less at a frequency of 100 kHz to 1 MHz.
- the relative dielectric constant of the transparent adhesive material at a frequency of 1 MHz is preferably 3.0 or less, and more preferably 2.8 or less.
- the function as an insulating layer is further enhanced when the relative dielectric constant is lower. That is, it is preferable that the frequency dependence of the dielectric constant is small.
- the difference ( ⁇ (1 MHz) ⁇ (1 kHz)) between the relative dielectric constant ( ⁇ (1 MHz)) at a frequency of 1 kHz and the relative dielectric constant ( ⁇ (1 kHz)) at a frequency of 1 MHz is 1. It is preferably 5 or less, more preferably 1.0 or less, and particularly preferably 0.8 or less. When ⁇ (1 MHz) ⁇ (1 kHz) is 1.5 or less, more stable electrical characteristics can be expressed in a wide frequency range.
- the olefin polymer (A) may be used as the base resin of the intermediate layer to reduce the dielectric.
- ⁇ (1 MHz) ⁇ (1 kHz) becomes larger than 1.5.
- the upper limit is preferably 20 mm or less, and more preferably 15 mm or less. If the amount of deviation is too small, sufficient print level absorbability cannot be obtained, and bubbles may be caught in the bonding step, or reliability after bonding may be reduced. On the other hand, if the sheet is greatly deviated, the end of the sheet flows during storage, resulting in poor long-term storage stability.
- the peel strength when the transparent adhesive material is peeled off at 23 ° C., 180 ° peeled at 60 mm / min immediately after the 2 kg roll is reciprocated once on soda lime glass by one reciprocation is 0. 5N / 10 mm or more is preferable, and 1N / 10 mm or more is more preferable. If the peeling force is too low, that is, the tackiness is low, for example, in the case of a configuration in which the transparent adhesive material and the release film are laminated, it is difficult to peel the release film from the transparent adhesive material.
- the transparent adhesive material preferably has a 180 ° peeling force of 2 N / 10 mm or more when one surface of the transparent adhesive material is laminated and pressure-bonded on soda lime glass and peeled off at 23 ° C. and a peeling speed of 60 mm / min. 4N / 10 mm or more is more preferable, and 6N / 10 mm or more is further preferable.
- the peeling force is in the specified range, it is possible to impart sufficient reliability when the transparent adhesive material is bonded to the adherend.
- the transparent adhesive material has a characteristic of being transparent, and is distinguished from a non-transparent material such as a foamed resin sheet. Specifically, the haze measured according to JIS K7136 is preferably 5% or less for the transparent adhesive material sandwiched between 0.5 mm thick soda lime glass, and preferably 2% or less. More preferably, it is 1% or less.
- This transparent adhesive material has a moisture permeability of 40 g and 90% RH in terms of a thickness of 150 ⁇ m, from the viewpoint of suppressing the ingress of moisture from the outside, protecting the optical device and peripheral members, and improving the reliability.
- / M 2 / day or less is preferable.
- 150 g / m 2 / day or less is preferable, and 100 g / m 2 / day or less is more preferable.
- the olefin polymer (A) contained in the intermediate layer is replaced with an ethylene- ⁇ -olefin copolymer, a styrene elastomer, or the like.
- a resin having a relatively high moisture permeability may be selected, or the thickness ratio and the layer configuration of the intermediate layer and the outermost layer may be adjusted. However, it is not limited to these methods.
- Method for producing transparent adhesive sheet As a method for forming a transparent adhesive sheet, there are known methods such as a single-screw extruder, a multi-screw extruder, a Banbury mixer, a kneader and other melt mixing equipment, an extrusion casting method using a T-die, a calendar method and inflation. Laws can be adopted. These are not particularly limited. With respect to the transparent adhesive material, an extrusion casting method is preferably used from the viewpoints of handling properties and productivity.
- the molding temperature in the extrusion casting method using a T die is appropriately adjusted depending on the flow characteristics and film forming properties of the resin composition used, but is preferably 80 to 230 ° C, more preferably 90 to 160 ° C.
- the method for laminating the layers constituting the transparent adhesive sheet is not particularly limited, and a known production method can be used.
- the film is laminated with a feed block or a multi-manifold die and then co-extruded by cooling and pressing with a chill roll for lamination, or with a T die attached with a resin composition at the tip of the extruder using an extruder.
- Extrusion laminating method which is melt-extruded in the form of a sheet and laminated on the surface of a resin composition previously formed into a sheet shape, and laminating in the same manner as the extrusion laminating method, followed by heat laminating method in which it is bonded by heating and pressing with a dielectric roll Can be mentioned.
- lamination by a coextrusion method is preferable.
- laminating in a molten state using a coextrusion method it is possible to stabilize the interfacial strength between the layers.
- the extrusion laminating method, the heat laminating method, etc. it is preferable to press-bond in the state which laminated
- various additives such as silane coupling agents, antioxidants, weathering stabilizers, etc.
- they may be supplied after blending with the resin in advance, or supplied after melting and mixing all the materials in advance.
- a master batch in which only the additive is previously concentrated in the resin may be prepared and supplied.
- various surface treatments such as corona treatment, plasma treatment and primer treatment may be performed on the surface.
- This transparent adhesive material can form an optical device constituting laminate by laminating an optical device constituting member on at least one surface, and an optical device can be constituted using the optical device constituting laminate.
- the intermediate layer and the outermost layer are photocrosslinked by irradiating light from the optical device constituent member side.
- a laminated body for constituting an optical device can be formed. Examples of light to be irradiated include ionizing radiation such as ⁇ rays, ⁇ rays, ⁇ rays, neutron rays, and electron rays, ultraviolet rays, and visible rays.
- ultraviolet rays are preferable. Moreover, it does not specifically limit regarding irradiation energy of light, irradiation time, an irradiation method, etc. What is necessary is just to activate a photocrosslinking initiator and to advance photocrosslinking.
- the outermost layer containing the photoreaction product of the acrylic polymer (B) and the photoreaction product of the olefin polymer (A) adjacent thereto are obtained.
- middle layer to contain can be formed.
- the transparent adhesive material after irradiation with light has a relative permittivity at a frequency of 100 kHz to 1 MHz of 3.3 or less, particularly 3.0 or less, and particularly 2.8 or less. it can. Further, in terms of thickness of 150 ⁇ m, the moisture permeability at 40 ° C.
- an optical device or a member for constituting an optical device can be produced by using this transparent adhesive material and the optical device constituting member after the light irradiation.
- the optical device is configured by laminating the transparent adhesive material after light irradiation with an optical device constituent member, irradiating the transparent adhesive material with light through the optical device constituent member, and photocrosslinking the transparent adhesive material.
- the optical device constituent member for example, forming a laminated body made of any one type or a combination of two or more types from the group consisting of a touch panel, an image display panel, a surface protection panel, a retardation film and a polarizing film. it can.
- the laminate can constitute an optical device as a laminate for constituting an optical device.
- the optical device constituent member for example, a laminated body composed of any one type or a combination of two or more types among a group consisting of a solar battery cell, a back surface protection panel, and a surface protection panel can be formed.
- the said laminated body can be used as a structural member of a solar cell module.
- the optical device constituent member for example, a laminated body composed of any one type or a combination of two or more types from the group consisting of a surface protective substrate, an organic EL element, and a back surface protective substrate can be formed.
- the said laminated body can be used as a structural member of an organic EL element.
- sheet is a thin product as defined by JIS and generally has a thickness that is small and flat instead of length and width.
- film refers to length and width.
- a thin flat product whose thickness is extremely small in comparison with the maximum thickness is arbitrarily limited and is usually supplied in the form of a roll (Japanese Industrial Standard JIS K6900).
- a film having a thickness of 100 ⁇ m or more is sometimes referred to as a sheet, and a film having a thickness of less than 100 ⁇ m is sometimes referred to as a film.
- composition 1 for forming an intermediate layer A-1 (density: 870 kg / m 3 , weight average molecular weight (Mw): 100,000, MFR (190 ° C., 21.18 N): an ethylene-butene random copolymer as the olefin polymer (A): 35 g / 10 min, relative dielectric constant 2.3 at 100 kHz 2.3, relative dielectric constant 2.3 at 1 MHz, butene content 14 mol%, crystal melting peak temperature 55 ° C., crystal melting heat amount 53 J / g) with respect to 1 kg, A-3 (density 868 kg / m 3 , melting point 54 ° C., MFR (190 ° C., 21.18 N): 1.7 g / 10 min, weight average molecular weight (Mw): 250,000, which is a silane-modified ethylene-octene random copolymer , 50 g of dielectric constant 2.3 at 100 kHz, and dielectric constant
- the composition for forming an intermediate layer 1 had a melt viscosity of 130 ° C. of 9.9 ⁇ 10 2 Pa ⁇ s, a dielectric constant of 2.3 at a frequency of 100 kHz, and a dielectric constant of 2.3 at a frequency of 1 MHz.
- composition 2 for forming an intermediate layer As the olefin polymer (A), 1 kg of A-1 is used, 30 g of isobornyl methacrylate is used as a crosslinking agent, 20 g of 1,10-decanediol dimethacrylate is used, and 2,4,6-trimethyl is used as a photocrosslinking initiator.
- An intermediate layer forming composition 2 was prepared by mixing 15 g of a mixture of benzophenone and 4-methylbenzophenone. The intermediate layer forming composition 2 had a melt viscosity of 130 ° C. of 5.7 ⁇ 10 2 Pa ⁇ s, a relative dielectric constant of 2.3 at a frequency of 100 kHz, and a relative dielectric constant of 2.3 at a frequency of 1 MHz.
- composition 3 for forming an intermediate layer As the olefin polymer (A), 1 kg of A-1 was used to prepare the intermediate layer forming composition 3 without mixing the crosslinking agent and the photocrosslinking initiator.
- the composition for forming an intermediate layer 3 had a melt viscosity of 130 ° C. of 6.0 ⁇ 10 2 Pa ⁇ s, a relative dielectric constant of 2.3 at a frequency of 100 kHz, and a relative dielectric constant of 2.3 at a frequency of 1 MHz.
- composition 4 for forming an intermediate layer Ethylene-butene copolymer A-2 (density: 864 kg / m 3 , MFR (190 ° C., 21.18 N): 3.6 g / 10 min, weight average molecular weight (Mw): 200,000, relative dielectric constant at 100 kHz 2.3 relative permittivity at 1 MHz 2.3, butene content 16 mol%, crystal melting peak temperature 40 ° C., crystal melting heat 45 J / g) 1 kg, isobornyl methacrylate 30 g as a crosslinking agent, 20 g of 1,10-decanediol dimethacrylate and 15 g of a mixture of 2,4,6-trimethylbenzophenone and 4-methylbenzophenone as a photocrosslinking initiator were mixed to prepare composition 5 for forming an intermediate layer.
- the intermediate layer forming composition 4 had a 130 ° C. melt viscosity of 6.4 ⁇ 10 3 Pa ⁇ s, a relative dielectric constant of 2.3 at a frequency of 100 kHz, and a relative dielectric constant of 2.3 at a frequency of 1 MHz.
- Outermost layer forming composition 1 To 1 kg of acrylate copolymer B-1 (weight average molecular weight (Mw): 400,000) obtained by random copolymerization of 77 parts by mass of 2-ethylhexyl acrylate, 19 parts by mass of vinyl acetate, and 4 parts by mass of acrylic acid Then, 20 g of isobornyl methacrylate (Mw: 222) and 15 g of a photocrosslinking initiator composed of a mixture of 2,4,6-trimethylbenzophenone and 4-methylbenzophenone (manufactured by Lanberti, Ezacure TZT) were mixed. The composition 1 for surface layer formation was produced. The outermost layer-forming composition 1 had a 130 ° C. melt viscosity of 2.4 ⁇ 10 2 Pa ⁇ s, a relative dielectric constant of 3.5 at a frequency of 100 kHz, and a relative dielectric constant of 3.2 at a frequency of 1 MHz.
- Mw weight average molecular weight
- Outermost layer forming composition 2 15 kg of a mixture of 2,4,6-trimethylbenzophenone and 4-methylbenzophenone as a photocrosslinking initiator is mixed with 1 kg of B-1 (weight average molecular weight (Mw): 400,000) which is an acrylate copolymer.
- B-1 weight average molecular weight (Mw): 400,000
- Mw weight average molecular weight
- composition 2 for forming the outermost layer was produced.
- the outermost layer forming composition 2 had a 130 ° C. melt viscosity of 2.8 ⁇ 10 2 Pa ⁇ s, a relative dielectric constant of 3.5 at a frequency of 100 kHz, and a relative dielectric constant of 3.2 at a frequency of 1 MHz.
- Outermost layer forming composition 3 To 1 kg of acrylate copolymer B-1 (weight average molecular weight (Mw): 400,000) obtained by random copolymerization of 77 parts by mass of 2-ethylhexyl acrylate, 19 parts by mass of vinyl acetate, and 4 parts by mass of acrylic acid Then, 20 g of 1,10-decanediol dimethacrylate (Mw: 310) as a crosslinking agent and 15 g of a mixture of 2,4,6-trimethylbenzophenone and 4-methylbenzophenone as a photocrosslinking initiator were mixed to form the outermost layer. Composition 1 was prepared. The outermost layer forming composition 1 had a 130 ° C. melt viscosity of 2.5 ⁇ 10 2 Pa ⁇ s, a relative dielectric constant of 3.5 at a frequency of 100 kHz, and a relative dielectric constant of 3.2 at a frequency of 1 MHz.
- Mw weight average molecular weight
- Example 1 Sheet formed by coextrusion at 130 ° C. so that the thickness of the composition for forming the outermost layer 1 / the composition for forming the intermediate layer 1 / the composition for forming the outermost layer 1 becomes 37.5 ⁇ m / 75 ⁇ m / 37.5 ⁇ m, respectively. Then, both surfaces were coated with two polyethylene terephthalate films (Mitsubishi Resin Diafoil MRA: thickness 100 ⁇ m and Mitsubishi Resin Diafoil MRF75: thickness 75 ⁇ m).
- a transparent adhesive sheet (thickness 150 ⁇ m) was prepared by irradiating ultraviolet rays of 365 nm from both surfaces via release PET with a high-pressure mercury lamp so that the integrated light amount was 1000 mJ / cm 2 . .
- Example 2 Coextruded sheet at 130 ° C. so that the thickness of the outermost layer forming composition 2 / the intermediate layer forming composition 2 / the outermost layer forming composition 2 is 37.5 ⁇ m / 75 ⁇ m / 37.5 ⁇ m, respectively. Then, both surfaces were coated with two polyethylene terephthalate films (Diafoil MRA and Diafoil MRF75) subjected to a release treatment. After that, a transparent adhesive sheet (thickness 150 ⁇ m) was prepared by irradiating ultraviolet rays of 365 nm from both surfaces via release PET with a high-pressure mercury lamp so that the integrated light amount was 1000 mJ / cm 2 . .
- Example 3 The outermost layer forming composition 3 / intermediate layer forming composition 2 / outermost layer forming composition 3 were coextruded at 130 ° C. so as to have a thickness of 60 ⁇ m / 30 ⁇ m / 60 ⁇ m, respectively. Thereafter, both surfaces were coated with two polyethylene terephthalate films (Diafoil MRA and Diafoil MRF75) subjected to a release treatment. After that, a transparent adhesive sheet (thickness 150 ⁇ m) was prepared by irradiating ultraviolet rays of 365 nm from both surfaces via release PET with a high-pressure mercury lamp so that the integrated light amount was 1000 mJ / cm 2 . .
- composition 2 for forming the outermost layer 2 / composition 3 for forming the intermediate layer 3 / composition 2 for forming the outermost layer is 37.5 ⁇ m / 75 ⁇ m / 37.5 ⁇ m, respectively
- both surfaces were coated with two polyethylene terephthalate films (Diafoil MRA and Diafoil MRF75) subjected to a release treatment.
- a transparent adhesive sheet (thickness 150 ⁇ m) was prepared by irradiating ultraviolet rays of 365 nm from both surfaces via release PET with a high-pressure mercury lamp so that the integrated light amount was 1000 mJ / cm 2 . .
- This sample was irradiated with ultraviolet rays of 365 nm from a PET film surface using a high-pressure mercury lamp so that the integrated light amount was 2000 mJ / cm 2, and then cured at 23 ° C. and 50% RH for 15 hours, thereby measuring the adhesive strength.
- a sample was prepared. The peeling force (N / 10 mm) when the sample was peeled off at a peeling angle of 180 ° and a peeling speed of 60 mm / min was measured.
- the release film of the sheet was peeled in order, and soda lime glass (82 mm ⁇ 53 mm ⁇ 0.5 mm thickness) was roll-laminated on both front and back surfaces.
- the bonded product was autoclaved (80 ° C., gauge pressure 0.3 MPa, 20 minutes), finished and bonded, and irradiated with 365 nm ultraviolet rays using a high-pressure mercury lamp so that the integrated light intensity was 2000 mJ / cm 2 .
- the sample for optical characteristic measurement was produced by curing at 23 degreeC50% RH for 15 hours. About the said sample, the haze value according to JISK7136 was calculated
- the sheets produced in Examples 1 to 3 were excellent in dielectric properties while satisfying the adhesiveness, peeling force, optical properties, etc. required for transparent adhesive sheets.
- Comparative Example 1 since no crosslinking agent or photocrosslinking initiator is used in the intermediate layer, diffusion penetration of the crosslinking agent contained in the intermediate layer, the crosslinking agent contained in the intermediate layer, and the resin composition constituting the outermost layer; The reaction between the intermediate layer and the outermost layer is less likely to occur, and the interlaminar strength is greatly reduced. During the peeling test, the interlayer peels off with a light force. In Comparative Example 2, since the melt viscosity of the intermediate layer is large and the difference in melt viscosity of the outermost layer is extremely large, sufficient interfacial adhesion cannot be ensured when the intermediate layer and the outermost layer are laminated.
- the intermediate layer contains a (meth) acrylate monomer as the crosslinking agent, and a relative dielectric constant at a frequency of 100 kHz to 1 MHz is 3.0 or less.
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Abstract
Description
さらに、部材の軽量薄肉化のみならず上記部材間の空隙も狭くなることから、接着シートなどの部材一体化に用いる充填部材にも更なる薄肉化が求められてきた。このため、電極と表面保護パネル間の充填に用いる粘着シートには、部材や自身の薄肉化に伴うタッチ検出感度の変化を吸収するため、低誘電率化する必要が生じてきた。
また、電極の軽量化や低コスト化に伴い、電極基板がガラスから樹脂フィルムに置き換わりつつあった。片面のみに導電性薄膜をパターン形成した電極の場合は、粘着シートなどを介して2つのフィルム電極同士、もしくはガラス電極とフィルム電極を積層する必要があり、その際に用いる粘着材層にも比誘電率が低いことが求められている。
しかし、オレフィン系重合体を主成分とする粘着材は、総じて粘着力がそれほど高くないため、特に上述のような光学装置の構成部材を貼り合せるには被着体との粘着性が不十分であった。
しかし、オレフィン系重合体とアクリル系重合体は本来的に接合し難い材料であるため、オレフィン系重合体を主成分とする樹脂層と、アクリル系重合体を主成分とする粘着層とを積層しようとしても、一体化するのが難しいという課題を抱えていた。
本発明はまた、アクリル系重合体(B)の光反応物を含有する最表層と、これに隣接する、オレフィン系重合体(A)の光反応物を含有する中間層とを備えた透明粘着材であって、周波数100kHz~1MHzにおける比誘電率が3.3以下であることを特徴とする透明粘着材を提案する。
また、アクリル系重合体(B)及び光架橋開始剤を含有する最表層を備えていることから、オレフィン系重合体(A)を主成分とする単層の粘着材に比べ、粘着特性を高めることができ、従来の実績からしても、光学装置構成用部材の貼り合せに用いることができる。
本実施形態に係る光架橋性透明粘着材(以下「本透明粘着材」と称する)は、アクリル系重合体(B)及び光架橋開始剤を含有する最表層と、オレフィン系重合体(A)、架橋剤及び光架橋開始剤を含有する中間層とを備えた透明粘着材である。
オレフィン系重合体(A)を含有する中間層を構成する樹脂組成物の130℃溶融粘度ηbと、アクリル系重合体(B)を含有する最表層を構成する樹脂組成物のそれηaとを所定範囲内に調整することにより、同一温度で同程度の粘度特性を示すようになるから、例えば共押出法や熱ラミネート法によって一体化する際に層間での密着性が高まるため、両層間の界面接着性を高めることができる。
かかる観点から、前記最表層及び前記中間層を構成する樹脂組成物の130℃溶融粘度ηは5×101~5×103Pa・sであるのが好ましい。5×101Pa・s以上であれば、加熱しながらシート化することが容易となり、5×103Pa・s以下であれば、層間の密着性を維持することができ、積層一体化し易くなるから好ましい。中でも、当該130℃溶融粘度ηは、7×101Pa・s以上或いは3×103Pa・s以下、その中でも1×102Pa・s以上或いは1×103Pa・s以下であるのが特に好ましい。
また、同じく上記観点から、最表層及び前記中間層を構成する樹脂組成物の最表層溶融粘度ηaと中間層溶融粘度ηbの比ηa/ηbが0.05~20であるのが好ましく、中でも0.07以上或いは15以下、その中でも0.1以上或いは10以下、さらにその中でも0.2以上或いは5以下であるのが特に好ましい。
かかる観点から、オレフィン系重合体(A)の重量平均分子量(Mw)は5万~40万、中でも6万以上或いは20万以下、その中でも7万以上或いは15万以下であるのが特に好ましい。
他方、アクリル系重合体(B)の重量平均分子量(Mw)は10万~80万、中でも15万以上或いは55万以下、その中でも20万以上或いは50万以下であるのが特に好ましい。
その他、架橋剤や光架橋開始剤などの添加成分の配合量の増減によって溶融粘度を調整してもよい。好ましい添加成分の組成およびその添加量については後述する。
中間層について説明する。
中間層は、少なくともオレフィン系重合体(A)、架橋剤及び光架橋開始剤を含有する層である。
該中間層の比誘電率が上記範囲内であれば、本透明粘着材に優れた電気特性を付与することが容易となる。
かかる観点から、中間層の比誘電率は、周波数100kHz~1MHz以下における比誘電率が3.0以下、中でも2.8以下、その中でも2.6以下であるのが特に好ましい。
なお、中間層の比誘電率を上記範囲内に調整するためには、オレフィン系重合体(A)として後述する樹脂を選択して用いるのが好ましい。
中間層に用いるオレフィン系重合体(A)としては、例えばエチレン-α-オレフィン共重合体、スチレン系エラストマー、ポリイソブチレン樹脂、ポリブテン樹脂、ポリブタジエン樹脂、ポリイソプレン樹脂、エチレン・環状オレフィン共重合体などを挙げることができ、これらのうちの一種又は二種類以上を組み合わせて用いることが好ましい。
中でも、透明粘着材としての電気特性や水蒸気バリア性、透明性、柔軟性、シート加工性、耐候信頼性等の観点から、エチレン-α-オレフィン共重合体、スチレン系エラストマー及びポリイソブチレン樹脂のうちの何れか一種又は二種類以上を組み合わせて用いることが特に好ましい。
この際、組成や分子量の異なる2種類以上のオレフィン系重合体を組み合わせて用いることも可能である。
エチレンと共重合するα-オレフィンの種類としては、特に限定されるものではない。
通常、炭素数が3~20のα-オレフィンを好適に用いることができる。例えば、プロピレン、1-ブテン、1-ペンテン、1-へキセン、1-へプテン、1-オクテン、1-ノネン、1-デセン、3-メチル-ブテン-1、4-メチル-ペンテン-1等を挙げることができる。中でも、工業的な入手のしやすさ、経済性等の観点から、α-オレフィンとして、1-ブテン、1-ヘキセン、または1-オクテンを共重合成分とする共重合体が好ましい。この際、エチレンと共重合するα-オレフィンは1種のみを単独で用いてもよく、2種類以上を任意の比率で組み合わせて用いてもよい。
なお、エチレンと共重合するα-オレフィンの種類及び含有量は、周知の方法、例えば、核磁気共鳴(NMR:Nuclear Magnetic Resonance)測定装置、その他の機器分析装置で分析することができる。
前記単量体単位としては、例えば、環状オレフィン、ビニル芳香族化合物(スチレンなど)、ポリエン化合物等を挙げることができる。
前記単量体単位の含有量は、エチレン-α-オレフィン共重合体中の全単量体単位を100モル%とした場合、好ましくは20モル%以下であり、より好ましくは15モル%以下である。
また、エチレン-α-オレフィン共重合体の立体構造、分岐、分岐度分布、分子量分布や共重合形式(ランダム、ブロックなど)は、特に制限されるものではないが、例えば、長鎖分岐を有する共重合体、すなわち主鎖自体に分岐を有する共重合体は、一般に機械物性が良好であり、また、フィルムを成形する際の溶融張力(メルトテンション)が高くなりカレンダー成形性が向上するなどの利点がある。
なお、前記結晶融解ピーク温度及び結晶融解熱量は、示差走査熱量計(DSC)を用いて、JIS K7121に準じて加熱速度10℃/分で測定することができる。
エチレン-α-オレフィン共重合体の中でも、結晶性が低く、光の透過率及び柔軟性に優れる観点から、エチレン-α-オレフィンランダム共重合体が更に好ましい。これらは1種のみを単独で用いられてもよく、また2種類以上が混合されて使用されてもよい。
重合後の造粒(ペレタイズ)のし易さや原料ペレットのブロッキング防止等の観点から、低分子量の成分が少なく分子量分布の狭い原料が重合できるシングルサイト触媒を用いた重合方法を用いて製造することが好ましい。
中間層は、架橋剤及び光架橋開始剤を含有するのが好ましい。
中間層が、架橋剤及び光架橋開始剤を含有すれば、オレフィン系重合体(A)と架橋反応したり、架橋剤間でネットワークを形成したりして、貯蔵弾性率G’を向上させることができ、実用上の耐久性を高めることができる。例えば、長期信頼性試験において、再流動、被着部材間のズレ、剥がれ、発泡などを抑えることができる。
その中でも、オレフィン系重合体(A)との相溶性、粘着材の透明性等を考慮すると、直鎖状脂肪族系、環状脂肪族系あるいは芳香族系の架橋剤を選択して用いることが好ましく、その中でも、炭素数が6以上の脂肪族系、あるいは環状脂肪族系の架橋剤を用いることがより好ましい。このような架橋剤を用いることで、オレフィン系重合体(A)と混ざりやすくなり、相分離、透明性の低下などの粘着材の変質を抑制することができる。
架橋剤の含有量は、オレフィン系重合体100質量部に対して1~50質量部であり、好ましくは1~20質量部、より好ましくは1~10質量部である。
光架橋開始剤を用いることで、低温下で短時間に光硬化させることできる。このため、被着部材である光学装置構成部材への損傷を十分に回避することができる。
前記光架橋開始剤の種類は、特に限定されるものではない。
開裂型光架橋開始剤として、例えばベンゾイソブチルエーテル、ベンジルメチルケタール、2-ヒドロキシアセトフェノンなど挙げることができる。
水素引抜型光架橋開始剤としては、例えばベンゾフェノン、ミヒラーケトン、2-エチルアントラキノン、チオキサンソンやその誘導体などを挙げることができる。
中間層を構成する組成物は、諸物性(柔軟性、耐熱性、透明性、接着性等)や成形加工性または経済性等をさらに向上させる目的で、前記オレフィン系重合体(A)、架橋剤及び光架橋開始剤以外の樹脂を含むことができる。例えば、アイオノマー樹脂、粘着付与樹脂等を挙げることができる。
中間層には、必要に応じて種々の添加剤を添加することができる。
当該添加剤としては、例えば、シランカップリング剤、酸化防止剤、耐候安定剤、加工助剤、造核剤、紫外線吸収剤、難燃剤、変色防止剤等を挙げることができる。これらの添加剤を単独で使用してもよく、2種以上を組み合わせて使用してもよい。これらのうち、シランカップリング剤、酸化防止剤、耐候安定剤、加工助剤について後述する。
シランカップリング剤は、最表層、あるいは光学装置を構成する周辺部材との接着性を向上させるのに有用であり、例えば、ビニル基、アクリロキシ基、メタクリロキシ基のような不飽和基、アミノ基、エポキシ基等とともに、アルコキシ基のような加水分解可能な官能基を有する化合物を挙げることができる。シランカップリング剤の具体例としては、N-(β-アミノエチル)-γ-アミノプロピルトリメトキシシラン、N-(β-アミノエチル)-γ-アミノプロピルメチルジメトキシシラン、γ-アミノプロピルトリエトキシシラン、γ-グリシドキシプロピルトリメトキシシラン、γ-メタクリロキシプロピルトリメトキシシラン等を例示することができる。
本透明粘着材においては、接着性が良好であり、黄変等の変色が少ないこと等からγ-グリシドキシプロピルトリメトキシシランやγ-メタクリロキシプロピルトリメトキシシランが好ましく用いられる。前記シランカップリング剤は、1種のみを単独で又は2種以上を組み合わせて用いることができる。
酸化防止剤としては、特に限定されるものではなく、種々の市販品が適用できる。酸化防止剤としては、モノフェノール系、ビスフェノール系、高分子型フェノール系等のフェノール系、硫黄系、ホスファイト系等の各種タイプのものを挙げることができる。
耐候性を付与する耐候安定剤としては、ヒンダードアミン系光安定化剤が好適に用いられる。ヒンダードアミン系光安定化剤としては、例えば、コハク酸ジメチル-1-(2-ヒドロキシエチル)-4-ヒドロキシ-2,2,6,6-テトラメチルピペリジン重縮合物、ポリ[{6-(1,1,3,3-テトラメチルブチル)アミノ-1,3,5-トリアジン-2,4-ジイル}{(2,2,6,6-テトラメチル-4-ピペリジル)イミノ}ヘキサメチレン{{2,2,6,6-テトラメチル-4-ピペリジル}イミノ}]、N,N’-ビス(3-アミノプロピル)エチレンジアミン-2,4-ビス[N-ブチル-N-(1,2,2,6,6-ペンタメチル-4-ピペリジル)アミノ]-6-クロロ-1,3,5-トリアジン縮合物、ビス(2,2,6,6-テトラメチル-4-ピペリジル)セパレート、2-(3,5-ジ-tert-4-ヒドロキシベンジル)-2-n-ブチルマロン酸ビス(1,2,2,6,6-ペンタメチル-4-ピペリジル)等を挙げることができる。
加工助剤は、前記中間層の微粘着性の調整や加熱溶融時の流動調整に用いることができる。例えば、透明性を疎外しない程度でパラフィンオイル、無機系もしくは有機系のナノ微粒子などを適宜選択して添加することが可能である。
最表層は、アクリル系重合体(B)及び光架橋開始剤を含有する層であり、粘着性を発揮し得る層であるのが好ましい。
また、最表層は、周波数100kHz~1MHzにおける比誘電率が中間層よりも高いことが好ましい。
その中でも、アルキル基を有する(メタ)アクリル酸エステルモノマーおよび/またはビニルエーテルモノマーを共重合して得られる重合体を主成分として含むことが好ましい。
最表層には架橋剤を添加してもよい。
当該架橋剤としては、例えば(メタ)アクリル系架橋剤、イソシアネート系架橋剤、エポキシ系架橋剤等を挙げることができ、これらを1種又は2種以上用いることができる。その中でも、アクリル系共重合体との相溶性等を考慮すると、アクリル系架橋剤を用いることが好ましく、重量平均分子量(Mw)5000以下のアクリルモノマーを用いることがより好ましい。
また、架橋剤は、以下に例示した(メタ)アクリレートに限定されるものではなく、例えば有機官能基を含有した(メタ)アクリレートモノマー等も好適に用いることが可能である。
2官能(メタ)アクリレートとしては、例えば1,3-プロパンジオールジアクリレート、1,4-ブタンジオールジアクリレート、1,6-ヘキサンジオールジアクリレート、1,9-ノナンジオールジアクリレート、ジエチレングリコールジアクリレート、ポリエチレングリコール400ジアクリレートおよびトリプロピレングリコールジアクリレート等を挙げることができる。
3官能(メタ)アクリレートとしては、例えばペンタエリスリトールトリアクリレート、トリメチロールプロパントリアクリレート、トリメチロールプロパンPO変性トリアクリレート、トリメチロールプロパンEO変性トリアクリレート等のトリアクリレートや、それらのトリメタクリレート等を挙げることができる。
4官能(メタ)アクリレートとしては、例えばジトリメチロールプロパンテトラアクリレート、ペンタエリスリトールテトラアクリレート等を挙げることができる。
最表層に用いる光架橋開始剤としては、中間層と同様に、開裂型の光架橋開始剤及び水素引抜型の光架橋開始剤のいずれを用いることもでき、中でも水素引抜型光架橋開始剤が好ましい。
本透明粘着材は、上記中間層および上記最表層をそれぞれ1層以上有し、かつこれらの層を積層し一体化してなる構成を備えることが特徴である。このような積層構成とすることで、電気特性や貼合後の信頼性のみならず、透明粘着材に要求される各種特性をバランスよく達成させることが可能である。
本透明粘着材の厚さの下限としては、10μm以上が好ましく、30μm以上がより好ましく、50μm以上がさらに好ましい。上限としては、1mm以下が好ましく、500μm以下がより好ましく、250μm以下がさらに好ましい。
シート厚を薄くすることで、薄肉化要求に応えることが可能であるが、あまりに厚さを薄くしすぎると、たとえば貼合部材表面に凹凸部あった場合に、段差の周囲に気泡が生じる可能性が考えられる。
(比誘電率)
例えば、タッチパネル機能付き光学装置構成部材と透明粘着材とを貼合する際、特にタッチパネル機能層同士もしくはタッチパネル機能層と表面保護部材との貼合に用いる場合、粘着シートには絶縁層としての機能が求められる。タッチ信号のような高周波の電気信号の損失を低減する観点から、粘着材には比誘電率が小さいことが求められる。
このような観点から、本透明粘着材に関しては、周波数100kHz~1MHzにおける比誘電率が3.3以下、中でも3.0以下、その中でも2.8以下であることが好ましい。
加えて、周波数1MHzにおける本透明粘着材の比誘電率が3.0以下であることが好ましく、2.8以下であることがより好ましい。
なお、周波数1kHzにおける比誘電率(ε(1MHz))と、周波数1MHzにおける比誘電率(ε(1kHz))との差(ε(1MHz)-ε(1kHz))が小さいということは、比誘電率の周波数依存性が小さいことを意味しており、幅広い周波数領域で安定した電気特性を発揮できることを期待することができる。
ε(1MHz)-ε(1kHz)が前記範囲になるように調製するためには、例えば中間層のベース樹脂としてオレフィン系重合体(A)を使用して低誘電化すればよい。アクリル系重合体を使用して低誘電化すると、ε(1MHz)-ε(1kHz)は1.5よりも大きくなってしまう。
例えば、タッチパネル機能付き光学装置構成部材と粘着材とを貼合する際、特に印刷段差を有する部材に貼合する場合には、段差吸収性を十分に得ることが必要になるが、一方で、粘着材保管時、特にロールで保管する際の保管安定性と背反特性になりやすい。粘着材の保持力を所定の値の範囲とすることで、上記物性のバランス化が可能になる。また、積層構成にすることで、上記物性と、電気特性をはじめとする各種物性のバランス化も容易になる。
このような観点から、本透明粘着材の、SUS板/粘着材(25×20mm)/PET構成、荷重0.5kg、温度40℃、時間30分における保持力試験でのずれ量の下限は、0.2mm以上が好ましく、0.5mm以上がより好ましい。さらに、上限は20mm以下が好ましく、15mm以下がより好ましい。
上記ずれ量が小さすぎる場合には、十分な印刷段差吸収性が得られず、貼合工程にて気泡が噛みこんだり、貼合後の信頼性が低下したりする。逆に大きくずれてしまう場合には、保管時にシートの端部が流れてしまい、長期保管安定性に劣る。
本透明粘着材を部材に貼合する際、ハンドリング性を良好にするためには、常温でロール圧着した際にある程度のタック性を有することが必要となる。
このような観点から、本透明粘着材を、ソーダライムガラスに2kgロールを1往復してロール圧着した直後に、23℃、180°剥離、60mm/minで引き剥がしたときの剥離力が0.5N/10mm以上であることが好ましく、1N/10mm以上であることがより好ましい。上記剥離力が低すぎる、すなわちタック性が低いと、例えば本透明粘着材と離型フィルムとを積層してなる構成の場合に、本透明粘着材から離型フィルムを剥離しにくくなる。
本透明粘着材は、本透明粘着材の一面をソーダライムガラスに重ねて圧着し、23℃、剥離速度60mm/分で引き剥がした際の180°剥離力が2N/10mm以上であることが好ましく、4N/10mm以上であることがより好ましく、6N/10mm以上であることがさらに好ましい。
剥離力が規定した範囲にあることによって、本透明粘着材を被着体に貼合した際の十分な信頼性を付与することが可能である。
本透明粘着材は、透明であるという特徴を有しており、たとえば発泡樹脂シートのような非透明なものとは区別される。具体的には、本透明粘着材の両面を厚さ0.5mmのソーダライムガラスで挟持したものについて、JIS K7136に準じて測定したヘーズは、5%以下であるのが好ましく、2%以下であるのがより好ましく、1%以下であるのがさらに好ましい。
本透明粘着材は、厚さ150μm換算で、40℃、90%RHにおける透湿度は、外部からの水分の浸入を抑制し、光学装置や周辺部材を保護し、信頼性を高める観点から、300g/m2/day以下であるのが好ましい。く、中でも150g/m2/day以下、その中でも100g/m2/day以下であるのがさらに好ましい。
なお、本透明粘着材の当該透湿度を300g/m2/day以下にするには、中間層に含まれるオレフィン系重合体(A)に、エチレン-α-オレフィン共重合体やスチレン系エラストマーなどといった比較的透湿度の高い樹脂を選定したり、中間層と最表層の厚み比や層構成を調整したりすればよい。但し、これらの方法に限定するものではない。
透明粘着シートの製膜方法としては、公知の方法、例えば単軸押出機、多軸押出機、バンバリーミキサー、ニーダーなどの溶融混合設備を有し、Tダイを用いる押出キャスト法、カレンダー法やインフレーション法等を採用することができる。これらは特に制限されるものではない。本透明粘着材に関しては、ハンドリング性や生産性等の面から押出キャスト法が好適に用いられる。
なお、押出ラミネート法や熱ラミネート法などを用いる場合には、あらかじめ離型フィルム面に粘着層を積層させた状態で圧着させておくことが好ましい。
また、透明粘着材の片面または両面には、シート同士のブロッキング防止や異物付着防止の観点から保護フィルムを積層させることが好ましい。或いは、必要に応じて、エンボス加工や種々の凹凸(円錐や角錐形状や半球形状など)加工を行ってもよい。また、各種被着体への接着性を向上させる目的で、表面にコロナ処理、プラズマ処理およびプライマー処理などの各種表面処理を行ってもよい。
本透明粘着材は、少なくとも片面に光学装置構成部材を積層させることで光学装置構成用積層体を形成することができ、当該光学装置構成用積層体を用いて光学装置を構成することができる。
例えば、本透明粘着材と光学装置構成部材とを貼合して光学装置構成用積層体を形成した後、当該光学装置構成部材側から光照射することで上記中間層及び最表層を光架橋させ、光学装置構成用積層体を形成することができる。
照射する光としては、α線、β線、γ線、中性子線、電子線などの電離性放射線、紫外線、可視光線などを挙げることができ、中でも紫外線が好適である。また、光の照射エネルギー、照射時間、照射方法などに関しては特に限定されず、光架橋開始剤を活性化させて、光架橋を進行させることができればよい。
そしてこの際、光照射した後の本透明粘着材は、周波数100kHz~1MHzにおける比誘電率が、上記のように3.3以下、中でも3.0以下、その中でも2.8以下とすることができる。また、厚さ150μm換算で、40℃、90%RHにおける透湿度は、上記のように300g/m2/day以下、中でも150g/m2/day以下、その中でも100g/m2/day以下とすることができる。また、JIS K7136に準じて測定したヘーズについては、上記のように、5%以下、特に2%以下、中でも特に1%以下とすることができる。
よって、この光照射後の本透明粘着材と光学装置構成部材とを用いて光学装置若しくは光学装置構成用部材を作製することができる。例えば光照射後の本透明粘着材を光学装置構成部材と積層し、該光学装置構成部材越しに光を前記透明粘着材に照射して、当該透明粘着材を光架橋させることで光学装置を構成することもできる。
本願発明において、「X~Y」(X,Yは任意の数字)と表現する場合、特にことわらない限り「X以上Y以下」の意と共に、「好ましくはXより大きい」或いは「好ましくはYより小さい」の意も包含する。
また、「X以上」(Xは任意の数字)或いは「Y以下」(Yは任意の数字)と表現した場合、「Xより大きいことが好ましい」或いは「Y未満であることが好ましい」旨の意図も包含する。
オレフィン系重合体(A)としての、エチレン-ブテンランダム共重合体であるA-1(密度:870kg/m3、重量平均分子量(Mw):10万、MFR(190℃、21.18N):35g/10min、100kHzにおける比誘電率2.3、1MHzにおける比誘電率2.3)、ブテン含有量14モル%、結晶融解ピーク温度55℃、結晶融解熱量53J/g)を1kgに対して、シラン変性エチレン-オクテンランダム共重合体であるA-3(密度868kg/m3、融点54℃、MFR(190℃、21.18N):1.7g/10min、重量平均分子量(Mw):25万、100kHzにおける比誘電率2.3、1MHzにおける比誘電率2.3)を50g、架橋剤として、イソボルニルメタクリレート(新中村化学工業社製NKエステルIB)を30g、1,10-デカンジオールジメタクリレート(新中村化学工業社製NKエステルDOD-N)を20g、光架橋開始剤として2,4,6-トリメチルベンゾフェノンと4-メチルベンゾフェノンの混合物(Lanberti社製、エザキュアTZT)を15g混合して、中間層形成用組成物1を作製した。
中間層形成用組成物1の130℃溶融粘度は9.9×102Pa・s、周波数100kHzにおける比誘電率は2.3、周波数1MHzにおける比誘電率は2.3であった。
オレフィン系重合体(A)として、A-1を1kg、架橋剤として、イソボルニルメタクリレートを30g、1,10-デカンジオールジメタクリレートを20g、光架橋開始剤として、2,4,6-トリメチルベンゾフェノンと4-メチルベンゾフェノンの混合物を15g混合して、中間層形成用組成物2を作製した。
中間層形成用組成物2の130℃溶融粘度は5.7×102Pa・s、周波数100kHzにおける比誘電率は2.3、周波数1MHzにおける比誘電率は2.3であった。
オレフィン系重合体(A)として、A-1を1kg用いて、架橋剤および光架橋開始剤を混合せずに、中間層形成用組成物3を作製した。
中間層形成用組成物3の130℃溶融粘度は6.0×102Pa・s、周波数100kHzにおける比誘電率は2.3、周波数1MHzにおける比誘電率は2.3であった。
エチレン-ブテン共重合体であるA-2(密度:864kg/m3、MFR(190℃、21.18N):3.6g/10min、重量平均分子量(Mw):20万、100kHzにおける比誘電率2.3、1MHzにおける比誘電率2.3、ブテン含有量16モル%、結晶融解ピーク温度40℃、結晶融解熱量45J/g)を1kgに対して、架橋剤としてイソボルニルメタクリレートを30g、1,10-デカンジオールジメタクリレートを20g、光架橋開始剤として2,4,6-トリメチルベンゾフェノンと4-メチルベンゾフェノンの混合物を15g混合して、中間層形成用組成物5を作製した。
中間層形成用組成物4の130℃溶融粘度は6.4×103Pa・s、周波数100kHzにおける比誘電率は2.3、周波数1MHzにおける比誘電率は2.3であった。
2-エチルヘキシルアクリレート77質量部、酢酸ビニル19質量部、アクリル酸4質量部とをランダム共重合してなるアクリル酸エステル共重合体B-1(重量平均分子量(Mw):40万)1kgに対して、イソボルニルメタクリレート(Mw:222)を20g、2,4,6-トリメチルベンゾフェノンと4-メチルベンゾフェノンの混合物からなる光架橋開始剤(Lanberti社製、エザキュアTZT)を15g混合して、最表層形成用組成物1を作製した。
最表層形成用組成物1の130℃溶融粘度は2.4×102Pa・s、周波数100kHzにおける比誘電率は3.5、周波数1MHzにおける比誘電率は3.2であった。
アクリル酸エステル共重合体であるB-1(重量平均分子量(Mw):40万)1kgに対して、光架橋開始剤として2,4,6-トリメチルベンゾフェノンと4-メチルベンゾフェノンの混合物を15g混合して、最表層形成用組成物2を作製した。
最表層形成用組成物2の130℃溶融粘度は2.8×102Pa・s、周波数100kHzにおける比誘電率は3.5、周波数1MHzにおける比誘電率は3.2であった。
2-エチルヘキシルアクリレート77質量部、酢酸ビニル19質量部、アクリル酸4質量部とをランダム共重合してなるアクリル酸エステル共重合体B-1(重量平均分子量(Mw):40万)1kgに対して、架橋剤として1,10-デカンジオールジメタクリレート(Mw:310)を20g、光架橋開始剤として2,4,6-トリメチルベンゾフェノンと4-メチルベンゾフェノンの混合物を15g混合して、最表層形成用組成物1を作製した。
最表層形成用組成物1の130℃溶融粘度は2.5×102Pa・s、周波数100kHzにおける比誘電率は3.5、周波数1MHzにおける比誘電率は3.2であった。
最表層形成用組成物1/中間層形成用組成物1/最表層形成用組成物1の厚さがそれぞれ37.5μm/75μm/37.5μmとなるように、130℃にて共押出してシート状に形成した後、剥離処理したポリエチレンテレフタレートフィルム2枚(三菱樹脂社製ダイアホイルMRA:厚さ100μmおよび三菱樹脂社製ダイアホイルMRF75:厚さ75μm)で両面を被覆した。その後、その後、離型PETを介した両表面から、高圧水銀ランプを用いて365nmの紫外線を積算光量が1000mJ/cm2となるように照射して、透明粘着シート(厚さ150μm)を作製した。
最表層形成用組成物2/中間層形成用組成物2/最表層形成用組成物2の厚さがそれぞれ37.5μm/75μm/37.5μmとなるように、130℃にて共押出してシート状に形成した後、剥離処理したポリエチレンテレフタレートフィルム2枚(ダイアホイルMRAおよびダイアホイルMRF75)で両面を被覆した。その後、その後、離型PETを介した両表面から、高圧水銀ランプを用いて365nmの紫外線を積算光量が1000mJ/cm2となるように照射して、透明粘着シート(厚さ150μm)を作製した。
最表層形成用組成物3/中間層形成用組成物2/最表層形成用組成物3の厚さがそれぞれ60μm/30μm/60μmとなるように、130℃にて共押出してシート状に形成した後、剥離処理したポリエチレンテレフタレートフィルム2枚(ダイアホイルMRAおよびダイアホイルMRF75)で両面を被覆した。その後、その後、離型PETを介した両表面から、高圧水銀ランプを用いて365nmの紫外線を積算光量が1000mJ/cm2となるように照射して、透明粘着シート(厚さ150μm)を作製した。
最表層形成用組成物2/中間層形成用組成物3/最表層形成用組成物2の厚さがそれぞれ37.5μm/75μm/37.5μmとなるように、130℃にて共押出してシート状に形成した後、剥離処理したポリエチレンテレフタレートフィルム2枚(ダイアホイルMRAおよびダイアホイルMRF75)で両面を被覆した。その後、その後、離型PETを介した両表面から、高圧水銀ランプを用いて365nmの紫外線を積算光量が1000mJ/cm2となるように照射して、透明粘着シート(厚さ150μm)を作製した。
最表層形成用組成物2/中間層形成用組成物4/最表層形成用組成物2の厚さがそれぞれ37.5μm/75μm/37.5μmとなるように、130℃にて共押出してシート状に形成した後、剥離処理したポリエチレンテレフタレートフィルム2枚(ダイアホイルMRAおよびダイアホイルMRF75)で両面を被覆した。その後、その後、離型PETを介した両表面から、高圧水銀ランプを用いて365nmの紫外線を積算光量が1000mJ/cm2となるように照射して、透明粘着シート(厚さ150μm)を作製した。
中間層形成用組成物1のみを厚さ150μmとなるようにシート状に形成した後、剥離処理したポリエチレンテレフタレートフィルム2枚(ダイアホイルMRAおよびダイアホイルMRF75)で両面を被覆して、透明粘着シート(厚さ150μm)を作製した。
上記実施例及び比較例で得た透明粘着シートについて、次のように物性評価した。
実施例および比較例で作製したシートを、ソーダライムガラスに2kgロールを1往復してロール圧着した直後に、23℃、180°剥離、60mm/minで引き剥がしたときの剥離力を測定した。
0.5N/10mm未満のものを「×」、0.5N/10mm以上のものを「○」と判定した。
実施例および比較例で作製したシートの一方の離型フィルムを剥離し、裏打ちフィルムとして50μmのPETフィルム(三菱樹脂製ダイアホイルT100、50μm)を貼合した。上記積層品を長さ150mm、巾10mmに裁断した後、残りの離型フィルムを剥がして露出した粘着面をソーダライムガラスにロール圧着した。貼合品にオートクレーブ処理(80℃、ゲージ圧0.3MPa、20分)を施して仕上げ貼着した。この試料に、PETフィルム面から、高圧水銀ランプを用いて365nmの紫外線を積算光量が2000mJ/cm2となるように照射した後、23℃50%RHで15時間養生することで、接着力測定用サンプルを作製した。
上記サンプルを、剥離角180°、剥離速度60mm/分で引き剥がしたときの剥離力(N/10mm)を測定した。
実施例および比較例で作製したシートの一方の離型フィルムを剥離し、SUS板にロール圧着した後、オートクレーブ処理(80℃、ゲージ圧0.3MPa、20分)を施して貼着した。次に、残りの離型フィルムを剥離して45mmΦのアルミ箔をロール圧着し、比誘電率測定サンプルを作製した。この際、比較例3については、離型フィルムを両面剥離したのち、シートの両面に45mmΦとなるようにアルミ電極を真空蒸着させることで、比誘電率測定サンプルとした。
比誘電率測定サンプルを用いて、LCRメータ(アジレントテクノロジー社製HP4284A)にて、JIS C2138に準拠して23℃50%RH、周波数1kHz~1MHzにおける比誘電率を測定した。
シートの離型フィルムを順次剥離し、ソーダライムガラス(82mm×53mm×0.5mm厚)表裏両面にロール貼合した。貼合品にオートクレーブ処理(80℃、ゲージ圧0.3MPa、20分)を施して仕上げ貼着し、高圧水銀ランプを用いて365nmの紫外線を積算光量が2000mJ/cm2となるように照射した後、23℃50%RHで15時間養生することで、光学特性測定用サンプルを作製した。上記サンプルについて、ヘーズメーター(日本電色工業社製NDH5000)を用いて、JIS K7136に準じたヘーズ値を求めた。
比較例2では、中間層の溶融粘度が大きく、かつ最表層の溶融粘度の差が極めて大きいために、中間層と最表層を積層する際に十分な界面密着性が確保できず、比較例1同様に剥離試験時には軽い力で層間が剥離するものであった。
比較例3では中間層組成物を単層で用いているため、粘着シートとしては常温での粘着性が不足しており、粘着シートとしてのハンドリング性に劣るものとなった。
Claims (14)
- アクリル系重合体(B)及び光架橋開始剤を含有する最表層と、オレフィン系重合体(A)、架橋剤及び光架橋開始剤を含有する中間層とを備えた透明粘着材であって、
前記中間層は、前記架橋剤として(メタ)アクリレートモノマーを含有することを特徴とする光架橋性透明粘着材。 - 前記最表層及び前記中間層を構成する樹脂組成物の130℃溶融粘度が5×101~5×103Pa・sであり、且つ最表層溶融粘度ηaと中間層溶融粘度ηbの比ηa/ηbが0.05~20であることを特徴とする請求項1に記載の光架橋性透明粘着材。
- 中間層における(メタ)アクリレートモノマーの濃度が最表層のそれよりも高いことを特徴とする請求項1又は2に記載の光架橋性透明粘着材。
- 前記アクリル系重合体(B)の重量平均分子量(Mw)が10万~80万であり、前記オレフィン系重合体(A)の重量平均分子量(Mw)が5万~40万であることを特徴とする請求項1~3の何れかに記載の光架橋性透明粘着材。
- 前記オレフィン系重合体(A)が、エチレン-α-オレフィン共重合体、スチレン系エラストマーおよびポリイソブチレン樹脂からなる群より選ばれる1種の樹脂又は2種以上の混合樹脂であることを特徴とする請求項1~4の何れかに記載の光架橋性透明粘着材。
- 周波数100kHz~1MHzにおける前記中間層の比誘電率が3.0以下であることを特徴とする請求項1~5の何れかに記載の光架橋性透明粘着材。
- アクリル系重合体(B)の光反応物を含有する最表層と、これに隣接する、オレフィン系重合体(A)の光反応物を含有する中間層とを備えた透明粘着材であって、
周波数100kHz~1MHzにおける比誘電率が3.3以下であることを特徴とする光架橋性透明粘着材。 - 厚さ150μm換算で、40℃、90%RHにおける透湿度が300g/m2/day以下であることを特徴とする請求項7に記載の光架橋性透明粘着材。
- JIS K7136に準じて測定したヘーズが5%以下である請求項7又は8に記載の光架橋性透明粘着材。
- 請求項1~6の何れかに記載の光架橋性透明粘着材と、離型フィルムとを積層してなる透明粘着材積層体。
- 請求項7~9の何れかに記載の光架橋性透明粘着材と光学装置構成部材とを用いて作製された光学装置構成用積層体。
- 請求項10に記載の透明粘着材積層体の離型フィルム越しに光を前記透明粘着材に照射して光架橋させて当該透明粘着材を一次硬化させた後、当該一次硬化させた透明粘着材を光学装置構成部材に積層し、該光学装置構成部材越しに光を前記透明粘着材に照射して光架橋させて当該透明粘着材を二次硬化させて得られる構成を備えた光学装置構成用積層体。
- 請求項7~9の何れかに記載の光架橋性透明粘着材を光学装置構成部材に積層し、該光学装置構成部材越しに光を前記透明粘着材に照射して、当該透明粘着材を光架橋させることを特徴とする光学装置構成用積層体の製造方法。
- 請求項1~6の何れかに記載の光架橋性透明粘着材を光架橋させて当該透明粘着材を一次硬化させた後、当該一次硬化させた透明粘着材を光学装置構成部材に積層し、該光学装置構成部材越しに光を前記透明粘着材に照射して光架橋させて当該透明粘着材を二次硬化させることを特徴とする光学装置構成用積層体の製造方法。
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KR102347913B1 (ko) | 2022-01-06 |
CN106574150B (zh) | 2020-04-03 |
TW201614031A (en) | 2016-04-16 |
US11111419B2 (en) | 2021-09-07 |
TWI675082B (zh) | 2019-10-21 |
CN106574150A (zh) | 2017-04-19 |
KR20170060025A (ko) | 2017-05-31 |
US20210230461A1 (en) | 2021-07-29 |
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