WO2016121557A1 - Feuille adhésive sensible à la pression, stratifié pour écran tactile, et écran tactile capacitatif - Google Patents

Feuille adhésive sensible à la pression, stratifié pour écran tactile, et écran tactile capacitatif Download PDF

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Publication number
WO2016121557A1
WO2016121557A1 PCT/JP2016/051301 JP2016051301W WO2016121557A1 WO 2016121557 A1 WO2016121557 A1 WO 2016121557A1 JP 2016051301 W JP2016051301 W JP 2016051301W WO 2016121557 A1 WO2016121557 A1 WO 2016121557A1
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Prior art keywords
adhesive sheet
pressure
sensitive adhesive
crosslinking agent
sheet according
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PCT/JP2016/051301
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English (en)
Japanese (ja)
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三ツ井　哲朗
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富士フイルム株式会社
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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
    • C09J7/10—Adhesives in the form of films or foils without carriers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/08—Macromolecular additives
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J201/00—Adhesives based on unspecified macromolecular compounds
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means

Definitions

  • the present invention relates to an adhesive sheet, a laminate for a touch panel, and a capacitive touch panel.
  • touch panels capable of detecting multiple points
  • a pressure-sensitive adhesive sheet is used to bring the members such as a display device and a touch panel sensor into close contact with each other.
  • Patent Document 1 discloses a pressure-sensitive adhesive sheet comprising a pressure-sensitive adhesive layer containing a specific acrylic polymer, wherein the pressure-sensitive adhesive layer has a gel fraction of 70 to 100% by weight. Is disclosed (claims, etc.).
  • touch panels are shifting from an air gap method to a direct bonding method (a method in which a touch panel sensor and a display device such as a liquid crystal display device (LCD) are directly bonded) for reasons such as improved visibility.
  • a direct bonding method a method in which a touch panel sensor and a display device such as a liquid crystal display device (LCD) are directly bonded
  • the pressure-sensitive adhesive sheet used for bonding has high flexibility (high elongation at break) and is less likely to cause distortion or foam after bonding (for example, one week after bonding). (Excellent aptitude (direct bonding aptitude)).
  • excellent workability and adhesion are also required.
  • the temperature change of the relative permittivity is small under various usage environments such as a cold region and a warm region.
  • the present invention aims to provide a pressure-sensitive adhesive sheet having a high elongation at break, a small change in temperature of relative permittivity, and excellent workability, bonding suitability and adhesion. To do.
  • the present inventor uses a curable composition containing a specific plasticizer and a cross-linking agent, and specifies the gel fraction and the cross-linking agent amount ratio.
  • the inventors have found that this can be solved, and have reached the present invention. That is, the present inventor has found that the above problem can be solved by the following configuration.
  • a pressure-sensitive adhesive sheet obtained by curing a curable composition contains at least one plasticizer selected from the group consisting of rubber, hydrogenated terpene resin, modified terpene resin and hydrogenated rosin resin, and a crosslinking agent,
  • the gel fraction is 50% by mass or less
  • the adhesive sheet whose cross-linking agent amount ratio represented by the following formula (1) is 1.00 ⁇ 10 ⁇ 4 or less.
  • Crosslinking agent amount ratio crosslinking agent content / crosslinking agent molecular weight ⁇ crosslinking agent crosslinkable group number / gel fraction (1)
  • a crosslinking agent content rate represents content of the said crosslinking agent with respect to solid content whole quantity in the said curable composition, and a unit is the mass%.
  • the cross-linking agent molecular weight represents the molecular weight of the cross-linking agent.
  • the number of crosslinkable crosslinkable groups represents the number of crosslinkable groups possessed by the crosslinker.
  • a gel fraction represents the gel fraction of the said adhesive sheet, and a unit is the mass%.
  • Adhesive sheet (16) The pressure-sensitive adhesive sheet according to any one of (1) to (15) above, which is a pressure-sensitive adhesive sheet for a touch panel.
  • a laminate for a touch panel comprising the pressure-sensitive adhesive sheet according to (16) above and a capacitive touch panel sensor.
  • a protective substrate is provided, The laminate for a touch panel according to (17), comprising the protective substrate, the pressure-sensitive adhesive sheet, and the capacitive touch panel sensor in this order.
  • a capacitive touch panel comprising a capacitive touch panel sensor, the adhesive sheet according to (16), and a display device in this order.
  • (meth) acrylate represents acrylate or methacrylate
  • (meth) acryloyl group represents acryloyl group or methacryloyl group
  • (meth) acryl represents acryl or methacryl.
  • 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.
  • content of the said component refers to total content.
  • the pressure-sensitive adhesive sheet of the present invention is a pressure-sensitive adhesive sheet obtained by curing a curable composition.
  • the curable composition contains at least one plasticizer selected from the group consisting of rubber, hydrogenated terpene resin, modified terpene resin and hydrogenated rosin resin, and a crosslinking agent.
  • the pressure-sensitive adhesive sheet of the present invention has a gel fraction of 50% by mass or less and a cross-linking agent amount ratio represented by the formula (1) described later of 1.00 ⁇ 10 ⁇ 4 or less. Since the pressure-sensitive adhesive sheet of the present invention has such a configuration, it is considered that a desired effect can be obtained.
  • the curable composition, gel fraction, and crosslinking agent amount ratio used for the pressure-sensitive adhesive sheet of the present invention will be described in detail, and then the method for producing the pressure-sensitive adhesive sheet of the present invention will be described in detail.
  • curable composition used in the present invention (hereinafter also simply referred to as curable composition) is at least one plastic selected from the group consisting of rubber, hydrogenated terpene resin, modified terpene resin and hydrogenated rosin resin.
  • An agent hereinafter also referred to as a specific plasticizer
  • a crosslinking agent It is preferable that the said curable composition contains the prepolymer formed by superposing
  • the curable composition used in the present invention contains at least one plasticizer (specific plasticizer) selected from the group consisting of rubber, hydrogenated terpene resin, modified terpene resin, and hydrogenated rosin resin. contains.
  • the specific plasticizer is preferably at least one plasticizer selected from the group consisting of rubber, hydrogenated terpene resin and modified terpene resin, and at least one selected from the group consisting of hydrogenated terpene resin and modified terpene resin. More preferably, it is a seed plasticizer.
  • the rubber is not particularly limited, for example, natural rubber, polyisobutylene, polybutadiene, hydrogenated polyisoprene, hydrogenated polybutadiene, polyisoprene, polybutene, styrene butadiene copolymer, or a combination arbitrarily selected from these groups Examples thereof include copolymers and mixtures thereof.
  • the hydrogenated terpene resin is not particularly limited as long as it is a hydrogenated terpene resin.
  • the terpene resin to be hydrogenated is not particularly limited, and examples thereof include aromatic modified terpene resins and terpene phenol resins.
  • the modified terpene resin is not particularly limited as long as it is a modified terpene resin. Although it does not restrict
  • the hydrogenated rosin resin is not particularly limited as long as it is a hydrogenated rosin resin.
  • the rosin resin to be hydrogenated is not particularly limited, and examples thereof include natural rosin resins, disproportionated rosin resins, polymerized rosin resins, and resins obtained by esterifying these.
  • the content of the specific plasticizer with respect to the total solid content in the curable composition is preferably 10 to 90% by mass, more preferably 20 to 80% by mass, and 40 to 60% by mass. Further preferred.
  • solid content intends the component except a solvent.
  • the curable composition used in the present invention contains a crosslinking agent.
  • the crosslinking agent is not particularly limited as long as it is a compound having a plurality of (two or more) crosslinkable groups.
  • the crosslinkable group include an isocyanate group, an epoxy group, and a radical polymerizable group (for example, (meth) acryloyl group, acrylamide group, vinyl group, styryl group, allyl group, etc.).
  • crosslinking agent having an isocyanate group as a crosslinking group examples include tolylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate (isophorone diisocyanate), xylylene diisocyanate, hydrogenated xylylene diisocyanate, diphenylmethane diisocyanate, Examples thereof include hydrogenated diphenylmethane diisocyanate, tetramethylxylylene diisocyanate, naphthalene diisocyanate, triphenylmethane triisocyanate, polymethylene polyphenyl isocyanate, and adducts with polyols such as trimethylolpropane.
  • crosslinking agent epoxy crosslinking agent having an epoxy group as a crosslinking group
  • bisphenol A epichlorohydrin type epoxy resin
  • ethylene glycol glycidyl ether polyethylene glycol diglycidyl ether
  • glycerin diglycidyl ether glycerin triglycidyl ether
  • 1,6-hexanediol diglycidyl ether trimethylolpropane triglycidyl ether
  • diglycidylaniline diglycidylamine, N, N, N ′, N′-tetraglycidyl-m-xylenediamine and 1,3-bis (N , N'-diglycidylaminomethyl) cyclohexane and the like.
  • the molecular weight of the crosslinking agent is not particularly limited as long as the crosslinking agent amount ratio described below is within a specific range, but is preferably 100 to 10,000.
  • the molecular weight of a crosslinking agent be the weight average molecular weight (Mw) obtained by GPC (polystyrene standard).
  • Mw weight average molecular weight obtained by GPC (polystyrene standard).
  • the number of crosslinkable groups of the crosslinker is not particularly limited as long as the crosslinker amount ratio described below is in a specific range, but is preferably 2 to 10.
  • crosslinking agent content is not particularly limited as long as the crosslinking agent content ratio described below is in a specific range, but is 0.01 to 2.0% by mass. It is preferable that the content is 0.1 to 0.8 mass.
  • the curable composition used in the present invention may contain a monomer.
  • the monomer is not particularly limited as long as it is a polymerizable compound (polymerizable group-containing compound).
  • the polymerizable group is not particularly limited, and examples thereof include a radical polymerizable group and a cationic polymerizable group. Of these, a radical polymerizable group is preferable from the viewpoint of reactivity.
  • examples of the radical polymerizable group include (meth) acryloyl group, itaconic acid ester group, crotonic acid ester group, isocrotonic acid ester group, maleic acid ester group, vinyl group, acrylamide group, (meth) acrylamide group and the like. .
  • a (meth) acryloyl group, a vinyl group, an acrylamide group, and a (meth) acrylamide group are preferable, and a (meth) acryloyl group is particularly preferable.
  • the monomer is preferably a compound having only one polymerizable group.
  • the monomer is preferably a (meth) acrylic monomer or a vinyl monomer (for example, vinyl acetate, vinyl chloride, styrene, etc.), and more preferably a (meth) acrylic monomer.
  • the (meth) acrylic monomer is not particularly limited.
  • (meth) acrylic acid methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, isobutyl (meth) acrylate, t-butyl (meth) ) Acrylate, cyclohexyl (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, 2-ethylhexyl (meth) acrylate, dodecyl (meth) acrylate, isononyl (meth) acrylate, isodecinyl (meth) acrylate, stearyl (meth) acrylate, 2 -Hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, isobornyl (meth) acrylate, butoxydiethylene group Cole (
  • the content of the monomer with respect to the total solid content in the curable composition is not particularly limited, it is preferably less, preferably 5% by mass or less, and more preferably 1% by mass or less.
  • the curable composition used in the present invention preferably contains a prepolymer.
  • the prepolymer is formed by polymerizing monomers, and can be polymerized with other monomers and prepolymers. Specific examples and preferred embodiments of the monomer are as described above.
  • the method for forming the prepolymer is not particularly limited, and examples thereof include photopolymerization and thermal polymerization. More specifically, for example, polymerization in a solution in which a monomer, a photopolymerization initiator or a thermal polymerization initiator, and a solvent are mixed may be mentioned.
  • the formation method of the prepolymer is preferably thermal polymerization.
  • the weight average molecular weight of the prepolymer is not particularly limited, but is preferably 200,000 or more, and more preferably 400,000 or more.
  • the upper limit is not particularly limited, but is preferably 2 million or less.
  • the weight average molecular weight (Mw) is measured in terms of standard polystyrene by gel permeation chromatography (GPC) using tetrahydrofuran as a solvent.
  • the content of the prepolymer relative to the total solid content in the curable composition is not particularly limited, but is preferably 10 to 90% by mass, more preferably 20 to 80% by mass, and 40 to 60% by mass. More preferably it is.
  • the curable composition used in the present invention preferably contains an initiator.
  • the initiator is not particularly limited, and examples thereof include an azo polymerization initiator, a persulfate polymerization initiator, a persulfate polymerization initiator, and a redox polymerization initiator.
  • Examples of the azo polymerization initiator include 2,2′-azobisisobutyronitrile, 2,2′-azobis (2-amidinopropane) dihydrochloride, 2,2′-azobis [2- (5- Methyl-2-imidazolin-2-yl) propane] dihydrochloride, 2,2′-azobis (2-methylpropionamidine) disulfate, 2,2′-azobis (N, N′-dimethyleneisobutylamidine) dihydro Examples include chloride. Examples of the persulfate-based polymerization initiator include potassium persulfate and ammonium persulfate.
  • Examples of the persulfate-based polymerization initiator include benzoyl peroxide, t-butyl hydroperoxide, and hydrogen peroxide.
  • Examples of the redox polymerization initiator include redox initiators that are a combination of a peroxide and a reducing agent, such as a combination of a persulfate and sodium bisulfite, or a combination of a peroxide and sodium ascorbate. It is done.
  • Such a polymerization initiator may be a water-soluble initiator or an oil-soluble initiator.
  • such a polymerization initiator may be used individually or in combination of 2 or more types.
  • the initiator examples include an alkynephenone photopolymerization initiator, a methoxyketone photopolymerization initiator, an acyl phosphine oxide photopolymerization initiator, and a hydroxyketone photopolymerization initiator (for example, IRGACURE184; 1,2- ⁇ -Hydroxyalkylphenone), aminoketone photoinitiators (for example, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholino-propan-1-one (IRGACURE® 907), oxime type A photoinitiator etc. are also mentioned.
  • the aspect containing at least 1 selected from the group which consists of a monoacyl phosphine oxide (A1) and a bisacyl phosphine oxide (A2) is mentioned.
  • the monoacylphosphine oxide (A1) is not particularly limited, and a known monoacylphosphine oxide can be used.
  • the monoacylphosphine oxide represented by a following formula (A1) is mentioned, for example.
  • R A11 represents a hydrocarbon group which may have a substituent. Although it does not restrict
  • the aliphatic hydrocarbon group may be linear, branched or cyclic. Specific examples of the aliphatic hydrocarbon group include a linear or branched alkyl group (particularly 1 to 20 carbon atoms), a linear or branched alkenyl group (particularly 2 to 20 carbon atoms), Examples thereof include a linear or branched alkynyl group (particularly, having 2 to 20 carbon atoms).
  • the aliphatic hydrocarbon group is preferably a linear or branched alkyl group.
  • the aromatic hydrocarbon group include an aryl group and a naphthyl group.
  • the aryl group include aryl groups having 6 to 18 carbon atoms such as a phenyl group, a tolyl group, and a xylyl group.
  • the substituent that the hydrocarbon group may have is not particularly limited, but specific examples include an aliphatic hydrocarbon group, an aromatic hydrocarbon group, a halogen atom (a fluorine atom, a chlorine atom, a bromine atom, etc.) and the like. Can be mentioned. Specific examples and preferred embodiments of the aliphatic hydrocarbon group and the aromatic hydrocarbon group are as described above.
  • the substituent is preferably an aliphatic hydrocarbon group.
  • R A12 and R A13 each independently represent a hydrocarbon group or a hydrocarbon oxy group (—OR: where R represents a hydrocarbon group) which may have a substituent.
  • R represents a hydrocarbon group
  • R represents a hydrocarbon group
  • Specific examples of the hydrocarbon group of the hydrocarbon group which may have a substituent and the hydrocarbon group (R) of the hydrocarbon oxy group are the same as the hydrocarbon group described above.
  • the specific example and suitable aspect of a substituent which a hydrocarbon group or a hydrocarbon oxy group may have are the same as the substituent mentioned above.
  • One of R A12 and R A13 is preferably an aromatic hydrocarbon group which may have a substituent.
  • R A12 and R A13 When one of R A12 and R A13 is an aromatic hydrocarbon group which may have a substituent, the other may have a phenyl group (especially having 6 to 18 carbon atoms) or an alkoxy group which may have a substituent ( Particularly preferred are those having 1 to 5 carbon atoms, and more preferred are phenyl groups (particularly 6 to 18 carbon atoms) which may have a substituent.
  • monoacylphosphine oxide (A1) examples include benzoyl-diphenylphosphine oxide, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 2,3,5,6-tetramethylbenzoyl-diphenylphosphine oxide, 3, Examples include 4-dimethylbenzoyl-diphenylphosphine oxide, 2,4,6-trimethylbenzoyl-phenylethoxyphosphine oxide, and the like.
  • the bisacylphosphine oxide (A2) is not particularly limited, and a known bisacylphosphine oxide can be used.
  • a suitable aspect of bisacylphosphine oxide (A2) the bisacylphosphine oxide represented by a following formula (A2) is mentioned, for example.
  • R A21 to R A23 each independently represents a hydrocarbon group which may have a substituent. Specific examples and preferred embodiments of the hydrocarbon group and the substituent are the same as those of R A11 described above.
  • bisacylphosphine oxide (A2) include bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide and bis (2,6-dimethoxybenzoyl) -2,4,4-trimethyl-pentylphosphine oxide. And bis (2,6-dimethylbenzoyl) -ethylphosphine oxide.
  • the content of the initiator with respect to the total solid content in the curable composition is not particularly limited, but is preferably 0.01 to 2% by mass, and more preferably 0.02 to 1% by mass.
  • the curable composition used by this invention may contain components other than the component mentioned above.
  • examples of such components include a solvent, an initiator, a chain transfer agent, a sensitizing dye, and a polymerization inhibition inhibitor.
  • the gel fraction of the pressure-sensitive adhesive sheet of the present invention is 50% by mass or less.
  • the content is preferably 10 to 40% by mass, and more preferably 20 to 30% by mass.
  • a gel fraction represents the ratio of the gel component in an adhesive sheet, and specifically represents the value calculated by the following method. That is, the pressure-sensitive adhesive sheet (0.3 g) is immersed in ethyl acetate (30 g) and allowed to stand at 40 ° C. for 16 hours. Thereby, components other than the gel component in an adhesive sheet melt
  • equation. “Gel fraction” (mass of adhesive sheet after immersion) / (mass of adhesive sheet before immersion) ⁇ 100 (mass%)
  • the pressure-sensitive adhesive sheet of the present invention has a crosslinking agent amount ratio represented by the following formula (1) of 1.00 ⁇ 10 ⁇ 4 or less.
  • Crosslinking agent amount ratio crosslinking agent content / crosslinking agent molecular weight ⁇ crosslinking agent crosslinkable group number / gel fraction (1)
  • a crosslinking agent content rate represents content of the said crosslinking agent with respect to solid content whole quantity in the said curable composition, and a unit is the mass%.
  • the molecular weight of the crosslinking agent represents the molecular weight of the crosslinking agent.
  • the number of crosslinkable groups of the crosslinker represents the number of crosslinkable groups possessed by the crosslinker.
  • the said gel fraction represents the gel fraction of an adhesive sheet, and a unit is the mass%.
  • a unit is the mass%.
  • the crosslinking agent amount ratio is calculated to be 7.45 ⁇ 10 ⁇ 5 .
  • the amount ratio of the crosslinking agent is preferably 1.00 ⁇ 10 ⁇ 5 or more, and more preferably 6.00 ⁇ 10 ⁇ 5 or more.
  • the pressure-sensitive adhesive sheet of the present invention can be obtained by curing the curable composition described above.
  • the method for curing the curable composition is not particularly limited.
  • the curable composition is applied onto a release sheet to form a curable layer, and this is heated or light (ultraviolet light, visible light, X-ray, etc.).
  • a method of curing by irradiation is mentioned.
  • the release sheet examples include a film whose surface is treated with a silicone-based release agent and other release agents, and a film that itself has release properties.
  • the material constituting the release sheet include polyolefins such as polypropylene and polyethylene, polyester, nylon, and polyvinyl chloride.
  • the thickness of the release sheet is not particularly limited, but is preferably from 25 to 150 ⁇ m, more preferably from 25 to 75 ⁇ m, from the viewpoint that the handleability of the pressure-sensitive adhesive sheet is excellent.
  • Examples of the method for applying the curable composition include a method using a gravure coater, a comma coater, a bar coater, a knife coater, a die coater, a roll coater, and the like.
  • the heating method is not particularly limited, and for example, an air dryer, an oven, an infrared dryer, a heating drum, or the like can be used.
  • the heating temperature is not particularly limited, but is preferably 30 to 150 ° C, more preferably 40 to 120 ° C.
  • the heating time is not particularly limited, but drying in the coating apparatus is preferably 1 to 20 minutes, and heating after the coating apparatus, for example, in a winding form, is preferably from room temperature to 50 ° C.
  • Examples of the light irradiation method include a low pressure mercury lamp, a medium pressure mercury lamp, a high pressure mercury lamp, a metal halide lamp, a Deep-UV light, a xenon lamp, a chemical lamp, a carbon arc lamp, and the like.
  • the energy of light irradiation is not particularly limited, but is preferably 0.1 to 10 J / cm 2 .
  • the pressure-sensitive adhesive sheet of the present invention preferably does not contain a substrate from the viewpoint of elongation at break and suitability for bonding.
  • the base material does not include the release sheet described above.
  • the breaking elongation of the pressure-sensitive adhesive sheet of the present invention is preferably 700% or more.
  • the elongation at break is determined by setting an adhesive sheet (2 cm ⁇ 5 cm) on a tensile tester (chucking at 1 cm at the end, freeing 3 cm), pulling until 300 mm / min until it breaks, and until breaking This is a value calculated by the following formula from the measured distance.
  • Elongation at break (%) (distance pulled to break + 3 cm) / 3 cm ⁇ 100
  • the relative dielectric constant at 25 ° C. of the pressure-sensitive adhesive sheet of the present invention is preferably 3.0 or less.
  • the relative dielectric constant at 25 ° C. is evaluated as follows. One surface of the pressure-sensitive adhesive sheet is bonded to an Al substrate having a length of 20 mm ⁇ width of 20 mm and a thickness of 0.5 mm, and then an Al substrate having the same size as the Al substrate is bonded to the other surface. Next, pressure defoaming treatment is performed at 40 ° C. and 5 atm for 60 minutes to prepare a sample for evaluating relative permittivity.
  • the thickness of the pressure-sensitive adhesive sheet is calculated by measuring the thickness of the sample at five locations with a micrometer and subtracting the thickness of two Al substrates from the average value.
  • impedance measurement at 100 kHz is performed with an impedance analyzer (Agilent 4294A), and the relative dielectric constant of the adhesive sheet is measured.
  • the capacitance C is obtained by measuring the relative dielectric constant of the sample at 25 ° C. using an impedance analyzer (Agilent 4294A) at 100 kHz. Then, using the obtained capacitance C, the relative dielectric constant at 25 ° C. is calculated from the following formula (X).
  • relative dielectric constant (capacitance C ⁇ thickness T) / (area S ⁇ vacuum dielectric constant ⁇ 0 )
  • the thickness T is the thickness of the pressure-sensitive adhesive sheet
  • the area S is the aluminum electrode area (vertical 20 mm ⁇ horizontal 20 mm)
  • the vacuum permittivity ⁇ 0 is a physical constant (8.854 ⁇ 10 ⁇ 12 F / m).
  • the temperature change of the dielectric constant from 0 degreeC to 60 degreeC of the adhesive sheet of this invention is 15% or less.
  • the temperature change of the dielectric constant from ⁇ 40 ° C. to 80 ° C. is 15% or less.
  • the temperature change of the dielectric constant from ⁇ 40 ° C. to 80 ° C. is evaluated as follows. 0 to 60 ° C. is measured in the same manner only by changing the temperature range. As described above, a relative dielectric constant evaluation sample is prepared. Then, the dielectric constant evaluation sample was heated stepwise from ⁇ 40 ° C. to 80 ° C.
  • the capacitance C was determined by impedance measurement at 100 kHz using an impedance analyzer (Agilent 4294A) at each temperature. Ask for. At each temperature, the sample is allowed to stand for 5 minutes until the temperature of the sample becomes constant. Thereafter, using the obtained capacitance C, the relative dielectric constant at each temperature is calculated as described above. The minimum value and the maximum value are selected from the calculated relative permittivity, and the temperature change (%) of the relative permittivity is obtained from the formula [(maximum value ⁇ minimum value) / minimum value ⁇ 100].
  • An adhesive sheet is a layer for ensuring the adhesiveness between members.
  • the pressure-sensitive adhesive sheet of the present invention is suitably used for touch panel applications as described later. Therefore, the 180-degree peel strength (adhesion strength) of the pressure-sensitive adhesive sheet obtained from the adhesive evaluation test described later is preferably 0.20 N / mm or more, more preferably 0.25 N / mm or more, and 0.3 N / mm or more. More preferably it is.
  • the upper limit is not particularly limited, but is usually 2.0 N / mm or less in many cases. If the peel strength is within the above range, the pressure-sensitive adhesive sheet exhibits a predetermined elasticity, so that even when various members are deformed due to a temperature change, the deformation can be followed.
  • the capacitive touch panel sensor is arranged between the capacitive touch panel sensor and the protective substrate (cover member), between the capacitive touch panel sensor and the display device, or on the substrate and the substrate in the capacitive touch panel sensor.
  • the adhesive sheet is bonded to a glass substrate, and the 180 degree peel strength is obtained by a method in accordance with “10.4 Measurement of peeling adhesive strength” in JIS Z0237 of the adhesive sheet. Ask.
  • the adhesive sheet (width 25 mm ⁇ length 40 mm to 0 mm) is faced to the vicinity of the center of the glass plate (40 mm or more ⁇ 60 mm or more) so that the longitudinal direction of the adhesive sheet and the glass plate is aligned. And bonding at 10 to 40 kPa. Then, align the longitudinal direction of the Kapton film (width 25 mm x length 150 mm or more) on the exposed surface of the adhesive sheet so that one end of the Kapton film does not contact the adhesive sheet, and the entire area of the adhesive sheet is covered with the Kapton film. A kapton film and an adhesive sheet are bonded together to obtain a laminate. Next, one end of a Kapton film not in contact with the adhesive sheet is set in an autograph (manufactured by Shimadzu Corporation) in a shape that pulls (peels) in the direction of 180 degrees, and the peel strength is measured.
  • an autograph manufactured by Shimadzu Corporation
  • the thickness of the pressure-sensitive adhesive sheet of the present invention is not particularly limited, but is preferably 5 to 2500 ⁇ m, more preferably 10 to 500 ⁇ m, and further preferably 50 to 250 ⁇ m.
  • the use of the pressure-sensitive adhesive sheet of the present invention is not particularly limited, but is particularly useful as a pressure-sensitive adhesive sheet for touch panels.
  • FIG. 1 is a cross-sectional view schematically showing one embodiment of the laminate for a touch panel of the present invention.
  • the laminated body 100 for a touch panel includes an adhesive sheet 12 and a capacitive touch panel sensor 18.
  • FIG. 2 is sectional drawing which represents typically another aspect of the laminated body for touchscreens of this invention.
  • the laminate for touch panel 200 includes a protective substrate 20, an adhesive sheet 12, and a capacitive touch panel sensor 18.
  • FIG. 3A is a cross-sectional view schematically illustrating one embodiment of the capacitive touch panel of the present invention.
  • the capacitive touch panel 300 includes the capacitive touch panel sensor 18, the adhesive sheet 12, and the display device 40.
  • FIG. 3B is a cross-sectional view schematically showing another aspect of the capacitive touch panel of the present invention.
  • the capacitive touch panel 400 includes the protective substrate 20, the adhesive sheet 12, the capacitive touch panel sensor 18, the adhesive sheet 12, and the display device 40.
  • the capacitive touch panel sensor 18 is disposed on the display device (operator side), and uses a change in capacitance that occurs when an external conductor such as a human finger comes into contact (approaching). It is a sensor that detects the position of an external conductor such as a finger.
  • the configuration of the capacitive touch panel sensor 18 is not particularly limited, but usually has a detection electrode (especially, a detection electrode extending in the X direction and a detection electrode extending in the Y direction), and the static electricity of the detection electrode in contact with or close to the finger.
  • the coordinates of the finger are specified by detecting the change in capacitance.
  • the protective substrate 20 is a substrate disposed on the adhesive sheet, and serves to protect a capacitive touch panel sensor 18 (to be described later) from the external environment, and its main surface constitutes a touch surface.
  • the protective substrate 20 is preferably a transparent substrate, and a plastic film, a plastic plate, a glass plate, or the like is used. It is desirable that the thickness of the substrate is appropriately selected according to each application.
  • the display device 40 is a device having a display surface for displaying an image, and each member is arranged on the display screen side.
  • the type of the display device 40 is not particularly limited, and a known display device can be used.
  • CTR cathode ray tube
  • LCD liquid crystal display
  • OLED organic light emitting diode
  • VFD vacuum fluorescent display
  • PDP plasma display panel
  • SED surface field display
  • FED field emission display
  • E-Paper electronic paper
  • acrylic polymer solution A The obtained acrylic polymer solution is referred to as “acrylic polymer solution A”.
  • acrylic polymer solution B ⁇ Preparation of acrylic polymer (prepolymer) solution B> Instead of stirring at 90 ° C., an acrylic polymer solution was obtained by the same procedure as the preparation of the acrylic polymer solution A described above except that stirring was performed at 75 ° C. The obtained acrylic polymer solution is designated as acrylic polymer solution B.
  • acrylic polymer (prepolymer) solution D 95 parts by mass of butyl acrylate, 5 parts by mass of acrylic acid, 5 parts by mass of dodecyl acrylate, 0.1 part by mass of azobisisobutyronitrile, and 140 parts by mass of ethyl acetate were mixed, The mixture was reacted at 0 ° C. for 8 hours to obtain an acrylic polymer solution.
  • the obtained acrylic polymer solution is designated as acrylic polymer solution D.
  • ⁇ Adhesion> The obtained pressure-sensitive adhesive sheet (between two pieces of peeled PET) was cut into 2.5 cm ⁇ 5 cm, and the peeled PET was peeled off from both sides. Next, one side of the pressure-sensitive adhesive sheet was attached to a glass substrate, and the other side was attached to a Kapton film. Subsequently, one end of the Kapton film was gripped using an autograph manufactured by Shimadzu Corporation, a 180 degree peel test (tensile speed of 300 cm / min) was performed, and an adhesion force (N / mm) was measured. The results are shown in Table 1. Practically, the adhesion is preferably 0.3 N / mm or more.
  • crosslinker content, crosslinker molecular weight, crosslinker crosslinkable group number, gel fraction, and crosslinker amount ratio in Table 1 are the above-mentioned crosslinker content, crosslinker molecular weight, and crosslinker crosslinkable group number, respectively. , Gel fraction, and crosslinker amount ratio.
  • the polymer molecular weight in Table 1 represents the weight average molecular weight of the acrylic polymer (prepolymer) in the acrylic polymer solution used to prepare the curable composition.
  • Acrylic polymer solution A Acrylic polymer solution A prepared as described above
  • Acrylic polymer solution B Acrylic polymer solution B prepared as described above
  • Acrylic polymer solution C Acrylic polymer solution C prepared as described above
  • Acrylic polymer solution D Acrylic polymer solution D prepared as described above
  • -Modified terpene resin YS resin TO85 (aromatic modified terpene resin, manufactured by Yasuhara Chemical Co., Ltd.)
  • -Hydrogenated terpene resin Clearon P85 (hydrogenated terpene resin, manufactured by Yasuhara Chemical Co., Ltd.)
  • -Rubber Polybest 110 (liquid polybutadiene, manufactured by evonik)
  • Hydrogenated rosin resin Pine Crystal KE359 (hydrogenated rosin ester resin, manufactured by Arakawa Chemical Industries)
  • Polycarbonate Polycarbonate-Ethylene glycol: Ethylene glycol-Terpene resin: YS Polystar T130 (terpene
  • Crosslinking agent 2 Coronate L (isocyanate crosslinking agent, trimethylolpropane adduct of trimylene diisocyanate (trimer), molecular weight: 656.64, number of crosslinkable groups (isocyanate groups): 3, manufactured by Nippon Polyurethane Industry Co., Ltd. )
  • Crosslinking agent 3 Isocyanate-based crosslinking agent (trimethylolpropane adduct of hexamethylene diisocyanate (trimer), molecular weight: 638.75, number of crosslinkable groups (isocyanate groups): 3)
  • the pressure-sensitive adhesive sheet is obtained by curing a curable composition containing a specific plasticizer and a crosslinking agent, and has a gel fraction of 50% by mass or less and a crosslinking agent amount ratio.
  • the specific plasticizer is at least one plasticizer selected from the group consisting of rubber, hydrogenated terpene resin and modified terpene resin have a change in temperature of relative permittivity. It was small.
  • Examples 1-2, 4-6, 9-10, and 12-14 having a gel fraction of 20-30% by mass were more excellent in workability and adhesion.
  • Example 14 whose specific plasticizer is a hydrogenated terpene resin was more excellent in adhesiveness.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Adhesive Tapes (AREA)

Abstract

La présente invention vise à fournir : une feuille adhésive sensible à la pression qui présente un allongement à la rupture élevé, change peu en termes de permittivité relative avec un changement de température, et est excellente en termes d'aptitude au traitement, d'applicabilité et d'adhésivité ; et un stratifié pour panneaux tactile et un panneau tactile capacitif qui comprennent, tous les deux, la feuille adhésive sensible à la pression. La feuille adhésive sensible à la pression selon la présente invention est obtenue par durcissement d'une composition durcissable, la composition durcissable contenant au moins un plastifiant choisi dans le groupe constitué par les caoutchoucs, les résines terpéniques hydrogénées, les résines terpéniques modifiées, et les résines de colophane hydrogénées et contenant en outre un agent de réticulation et la teneur en gel étant de 50 % en masse ou moins et la quantité de l'agent de réticulation en proportion représentée par l'équation (1) suivante étant de 1,00 × 10-4 ou moins. (quantité d'agent de réticulation en proportion) = (teneur de l'agent de réticulation) ÷ (poids moléculaire de l'agent de réticulation) x (nombre de groupes de réticulation dans l'agent de réticulation) ÷ (teneur en gel) (1)
PCT/JP2016/051301 2015-01-28 2016-01-18 Feuille adhésive sensible à la pression, stratifié pour écran tactile, et écran tactile capacitatif WO2016121557A1 (fr)

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Cited By (1)

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WO2018079249A1 (fr) * 2016-10-31 2018-05-03 富士フイルム株式会社 Stratifié pour panneaux tactiles, dispositif flexible et dispositif d'affichage électroluminescent organique

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JPH01261479A (ja) * 1988-04-12 1989-10-18 Nitto Denko Corp 感圧接着剤
JP2002114960A (ja) * 2000-10-10 2002-04-16 Lintec Corp 耐放射線性粘着剤及びこれを用いた粘着製品
JP2011105829A (ja) * 2009-11-16 2011-06-02 Nitto Denko Corp 粘着テープ
JP2013131151A (ja) * 2011-12-22 2013-07-04 Sekisui Chem Co Ltd 抵抗膜方式タッチパネル用部材及び抵抗膜方式タッチパネル
WO2015025803A1 (fr) * 2013-08-21 2015-02-26 富士フイルム株式会社 Feuille adhésive pour panneaux tactiles, laminé pour panneaux tactiles et panneau tactile capacitif
WO2015079862A1 (fr) * 2013-11-26 2015-06-04 富士フイルム株式会社 Film adhésif pour écrans tactiles, stratifié pour écrans tactiles, procédé de séparation de couche adhésive, procédé d'utilisation d'écran tactile, et système d'écran tactile

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Publication number Priority date Publication date Assignee Title
JPH01261479A (ja) * 1988-04-12 1989-10-18 Nitto Denko Corp 感圧接着剤
JP2002114960A (ja) * 2000-10-10 2002-04-16 Lintec Corp 耐放射線性粘着剤及びこれを用いた粘着製品
JP2011105829A (ja) * 2009-11-16 2011-06-02 Nitto Denko Corp 粘着テープ
JP2013131151A (ja) * 2011-12-22 2013-07-04 Sekisui Chem Co Ltd 抵抗膜方式タッチパネル用部材及び抵抗膜方式タッチパネル
WO2015025803A1 (fr) * 2013-08-21 2015-02-26 富士フイルム株式会社 Feuille adhésive pour panneaux tactiles, laminé pour panneaux tactiles et panneau tactile capacitif
WO2015079862A1 (fr) * 2013-11-26 2015-06-04 富士フイルム株式会社 Film adhésif pour écrans tactiles, stratifié pour écrans tactiles, procédé de séparation de couche adhésive, procédé d'utilisation d'écran tactile, et système d'écran tactile

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018079249A1 (fr) * 2016-10-31 2018-05-03 富士フイルム株式会社 Stratifié pour panneaux tactiles, dispositif flexible et dispositif d'affichage électroluminescent organique
KR20190055143A (ko) * 2016-10-31 2019-05-22 후지필름 가부시키가이샤 터치 패널용 적층체, 플렉시블 디바이스, 유기 전계 발광 표시 장치
CN109844700A (zh) * 2016-10-31 2019-06-04 富士胶片株式会社 触摸面板用层叠体、柔性器件、有机电致发光显示装置
JPWO2018079249A1 (ja) * 2016-10-31 2019-09-12 富士フイルム株式会社 タッチパネル用積層体、フレキシブルデバイス、有機電界発光表示装置
KR102193398B1 (ko) * 2016-10-31 2020-12-21 후지필름 가부시키가이샤 터치 패널용 적층체, 플렉시블 디바이스, 유기 전계 발광 표시 장치

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