WO2021199787A1 - Feuille adhésive double face, stratifié pour dispositif d'affichage d'image, et dispositif d'affichage d'image - Google Patents

Feuille adhésive double face, stratifié pour dispositif d'affichage d'image, et dispositif d'affichage d'image Download PDF

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WO2021199787A1
WO2021199787A1 PCT/JP2021/006553 JP2021006553W WO2021199787A1 WO 2021199787 A1 WO2021199787 A1 WO 2021199787A1 JP 2021006553 W JP2021006553 W JP 2021006553W WO 2021199787 A1 WO2021199787 A1 WO 2021199787A1
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meth
adhesive sheet
double
image display
display device
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PCT/JP2021/006553
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English (en)
Japanese (ja)
Inventor
福田　晋也
大希 野澤
秀次郎 吉川
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三菱ケミカル株式会社
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Priority to CN202180010580.0A priority Critical patent/CN115210332A/zh
Priority to JP2021510261A priority patent/JPWO2021199787A1/ja
Priority to KR1020227025563A priority patent/KR20220156518A/ko
Publication of WO2021199787A1 publication Critical patent/WO2021199787A1/fr

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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
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • C09J7/385—Acrylic polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/06—Interconnection of layers permitting easy separation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C09J133/04—Homopolymers or copolymers of esters
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • 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
    • 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
    • C09J2301/20—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself
    • C09J2301/208—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself the adhesive layer being constituted by at least two or more adjacent or superposed adhesive layers, e.g. multilayer adhesive
    • 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
    • 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

Definitions

  • the present invention relates to a double-sided adhesive sheet for use in bonding two image display device components, a laminate for an image display device, and an image display device.
  • an image display panel such as a liquid crystal display (LCD), a plasma display (PDP) or an electroluminescence display (ELD) and protection arranged on the front side (visual side) thereof.
  • the gap between the panel and the touch panel member is filled with a resin such as an adhesive or an adhesive to suppress reflection of incident light or emitted light from a display image at the air layer interface.
  • Patent Document 1 as a method for manufacturing an image display device constituent laminate having a structure in which image display device constituent members are laminated on at least one side of a transparent double-sided adhesive sheet, primary cross-linking is performed by ultraviolet rays.
  • a method is disclosed in which a pressure-sensitive adhesive sheet is attached to a component for an image display device, and then the pressure-sensitive adhesive sheet is irradiated with ultraviolet rays via the component for an image display device to be secondarily cured.
  • the adhesive used for this kind of purpose is required to have re-peelability (reworkability).
  • a laminated body of plate-shaped members having no flexibility is not easy to separate after being bonded once, and a member related to a large screen, a member having a curved surface shape, or an expensive member that is difficult to bond can be used.
  • a pressure-sensitive adhesive having reworkability is required.
  • Patent Document 2 a specific acrylic triblock copolymer is used, which does not require chemical cross-linking and has a pressure-sensitive adhesive performance.
  • Adhesives for optical films have been proposed, which have excellent durability and can be peeled off with an appropriate peeling strength without leaving adhesive residue.
  • Patent Document 3 states that the touch panel and the display surface of the display device are configured to be removable from at least one surface, and are optically isotropic. As a characteristic double-sided adhesive sheet, re-peeling is exhibited by making the adhesive force of the adhesive layer on the display device side to the display surface of the display device smaller than the adhesive force of the adhesive layer on the touch panel side to the sticking surface of the touch panel. Possible configurations are disclosed.
  • Patent Document 4 describes an adhesive having a structure in which an interface (internal peeling interface) that can be peeled off is provided inside as a removable adhesive material on a surface different from the bonding surface between the adhesive material and the adherend.
  • the sheet is disclosed.
  • the components for the image display device may be peeled (separated) by a cooling operation, but the re-peeling property disclosed in Patent Documents 2 to 4 is evaluated at room temperature. This has been done, and the removability by cooling operation has not been evaluated. Therefore, in Patent Documents 2 to 4, the pressure-sensitive adhesive sheet is not designed from the viewpoint of removability by a cooling operation.
  • the problem to be solved by the present invention is that the adhesive performance such as step absorption, adhesive strength, and bonding reliability is excellent, and the components for the image display device can be peeled (separated) by the cooling operation. To provide a seat.
  • the present inventors measured the ratio of tensile storage elastic modulus (E') to shear storage elastic modulus (G') and dynamic viscoelasticity in shear mode in a double-sided pressure-sensitive adhesive sheet. It has been found that the above problems can be solved by setting the peak temperature of the loss tangent obtained by the above method, the peak temperature of the loss tangent obtained by the dynamic viscoelastic modulus measurement in the tension mode, and the 180 ° peel adhesive force to predetermined values.
  • the gist of the present invention is the following [1] to [13].
  • [1] A double-sided adhesive sheet for use in bonding two components for an image display device.
  • the ratio (E'/ G') of the tensile storage elastic modulus (E') to the shear storage elastic modulus (G') is 5.0 or more.
  • the peak temperature (T1) of the loss tangent (Tan ⁇ ) obtained by the dynamic viscoelasticity measurement in the shear mode with a frequency of 1 Hz is -10 ° C or less.
  • the peak temperature (T2) of the loss tangent (Tan ⁇ ) obtained by dynamic viscoelasticity measurement in the tensile mode with a frequency of 1 Hz is -10 ° C or higher (however, it is the highest when two or more peak temperatures are observed.
  • T2 peak temperature
  • [4] Of the two components for an image display device one is glass, and the other is any one of the group consisting of a touch sensor, an image display panel, a surface protection panel, a polarizing film, and a retardation film.
  • the double-sided pressure-sensitive adhesive sheet is a pressure-sensitive adhesive sheet having at least three layers having a frontmost layer and a backmost layer as a (meth) acrylic pressure-sensitive adhesive layer.
  • the double-sided adhesive sheet of the present invention is excellent in adhesive performance such as step absorption, adhesive strength, and bonding reliability, and is also excellent in reworkability such that the components for an image display device can be easily peeled off by a cooling operation. Therefore, it can be suitably used for bonding components for image display devices, and is particularly preferably used for bonding members related to large screens that are difficult to bond, members having a curved surface shape, and expensive members. be able to.
  • (A) is the top view of the ITO pattern of an ITO glass substrate, or copper for corrosion resistance evaluation evaluation.
  • Top view of the copper pattern of the glass substrate (B) is the top view showing the state in which the adhesive sheet is coated on the ITO glass substrate for the evaluation of the reliability of corrosion resistance against ITO, or the copper glass substrate for the evaluation of the reliability of corrosion resistance of Cu.
  • a top view showing a state in which the sheet is coated (C) is a cross-sectional view of an ITO corrosion resistance evaluation sample, and (D) is a cross-sectional view of a Cu corrosion reliability evaluation sample.
  • (meth) acrylic means “acrylic” and “methacrylic”
  • (meth) acrylate means “acrylate” and “methacrylate”, respectively.
  • the double-sided pressure-sensitive adhesive sheet of the present invention is usually composed of a plurality of (meth) acrylic pressure-sensitive adhesive layers, and is used for bonding two constituent members for an image display device. Further, the double-sided pressure-sensitive adhesive sheet of the present invention preferably has photocurability that is cured by irradiating with active energy rays such as ultraviolet rays from the viewpoint of enhancing bonding reliability.
  • the peak temperature (T1) of the loss tangent (Tan ⁇ ) obtained by the dynamic viscoelasticity measurement of the double-sided adhesive sheet of the present invention in the shear mode at a frequency of 1 Hz is ⁇ 10 ° C. or lower, and is ⁇ 100 to ⁇ 15 ° C. It is preferably at ⁇ 50 to ⁇ 20 ° C., and particularly preferably at ⁇ 50 to ⁇ 20 ° C.
  • the peak temperature (T1) of the loss tangent (Tan ⁇ ) is within the above range, the step absorption property and the bonding reliability can be made excellent.
  • the peak temperature (T1) of the tangent loss obtained by the dynamic viscoelasticity measurement in the shearing mode is obtained by the following method.
  • the sample to be measured is laminated so as to have a thickness of 0.6 to 0.8 mm, and is used as a circular punched measurement sample having a diameter of 8 mm.
  • a rheometer (“Discovery HR2” manufactured by TA Instruments)
  • this measurement sample is used to measure the dynamic viscoelasticity spectrum in the shear mode under the following measurement conditions. From the dynamic viscoelastic spectrum data obtained by the measurement, the temperature at which the loss tangent (Tan ⁇ ) becomes the maximum value, that is, the peak temperature (T1) is read.
  • the dynamic viscoelasticity measurement in the shear mode is a numerical value when the thickness of the sample to be measured is 0.6 to 0.8 mm.
  • the peak temperature (T2) of the loss tangent (Tan ⁇ ) obtained by the dynamic viscoelasticity measurement of the double-sided adhesive sheet of the present invention in the tension mode at a frequency of 1 Hz is ⁇ 10 ° C. or higher, and reaches ⁇ 5 to 20 ° C. It is preferably present, and particularly preferably at 0 to 15 ° C.
  • the peak temperature (T2) of the loss tangent (Tan ⁇ ) obtained by the dynamic sticky bullet measurement in the tension mode can be obtained by the following method.
  • the sample to be measured has a tensile mode: vibration frequency of 1 Hz, measurement temperature: ⁇ 120 to 80 ° C., temperature rise rate: 3 ° C./min.
  • the sample to be used may be before curing or after curing, but it is preferably after curing.
  • the difference between the tangent (Tan ⁇ ) and the peak temperature (T1) is preferably 5 to 50 ° C., more preferably 10 to 40 ° C., and particularly preferably 15 to 30 ° C. Within the above range, it is possible to obtain an excellent balance of step absorption, bonding reliability, impact resistance, removability (reworkability), and cutting workability.
  • the 180 ° peel adhesive force of the double-sided adhesive sheet of the present invention with the adherend surface of the two image display device components to be bonded at 23 ° C. is 5N / 20mm or more, preferably 6N / 20mm or more. It is particularly preferably 7N / 20 mm or more.
  • the upper limit of the 180 ° peel adhesive force is usually 50 N / 20 mm.
  • the 180 ° peel adhesive strength is measured by the following method.
  • PET film (Diafoil T100 manufactured by Mitsubishi Chemical Corporation) and one side of a double-sided adhesive sheet are bonded together, and the other side is roll-bonded to a soda lime glass plate. And. Then, the bonded product is autoclaved (60 ° C., gauge pressure 0.2 MPa, 20 minutes) for finish bonding. Then, the PET film surface was irradiated with ultraviolet rays of 365 nm using a high-pressure mercury lamp so that the integrated light amount was 3000 mJ / cm 2, and then cured in an environment of 23 ° C. and 50% RH for 12 hours.
  • PTT polyethylene terephthalate
  • peeling force N / cm
  • peeling speed 300 mm / min in an environment of 23 ° C. and 50% RH is defined as a 180 ° peel adhesive force.
  • the layer structure of the double-sided pressure-sensitive adhesive sheet of the present invention is preferably two layers in which the front layer and the back layer are (meth) acrylic pressure-sensitive adhesive layers, and more preferably the outermost layer and the backmost layer are (meth) acrylic-based. At least three layers as the pressure-sensitive adhesive layer, particularly preferably three layers in which the outermost layer and the backmost layer are (meth) acrylic pressure-sensitive adhesive layers [outermost layer (adhesive layer) / intermediate layer / backmost layer (adhesive layer) )].
  • the glass transition temperature is ⁇ 10 ° C. or lower (meth).
  • a resin composition containing an outermost layer and an outermost layer (hereinafter referred to as "low Tg layer”) formed from an acrylic pressure-sensitive adhesive layer and a (meth) acrylic resin having a glass transition temperature higher than -10 ° C. It is particularly preferable to have an intermediate layer (hereinafter referred to as "high Tg layer”) formed from.
  • the glass transition temperature is defined by the peak temperature of loss tangent (Tan ⁇ ) obtained by dynamic viscoelasticity measurement in a shear mode with a frequency of 1 Hz, unless otherwise specified, and is defined by the above method. It is what is measured.
  • the glass transition temperature of the low Tg layer is usually ⁇ 10 ° C. or lower, preferably ⁇ 100 to ⁇ 15 ° C., and particularly preferably ⁇ 50 to ⁇ 20 ° C.
  • the glass transition temperature of the high Tg layer is usually higher than ⁇ 10 ° C., preferably ⁇ 5 to 20 ° C., and particularly preferably 0 to 15 ° C.
  • the difference in glass transition temperature between the high Tg layer and the low Tg layer is usually 5 ° C. or higher, preferably 10 ° C. or higher, and particularly preferably 20 ° C. or higher.
  • the upper limit is usually 50 ° C.
  • the double-sided pressure-sensitive adhesive sheet of the present invention at least three layers having the outermost layer and the innermost layer as the (meth) acrylic pressure-sensitive adhesive layer, particularly preferably the outermost layer and the innermost layer (meth).
  • Three layers [(adhesive layer) / intermediate layer / backmost layer (adhesive layer)] as an acrylic pressure-sensitive adhesive layer.
  • the surface to be bonded to the constituent member) is preferably a low Tg layer.
  • the intermediate layer sandwiched between the outermost surface and the outermost surface is preferably a high Tg layer.
  • the low Tg layer used for the outermost layer and the outermost layer may have different glass transition temperatures, but it is preferable that the outermost layer and the outermost layer have the same glass transition temperature, and the outermost layer and the outermost layer have the same glass transition temperature. It is particularly preferable that the innermost layer is a (meth) acrylic pressure-sensitive adhesive layer formed from the same resin composition.
  • one of the most preferable layer configurations of the double-sided pressure-sensitive adhesive sheet of the present invention is a three-layer configuration of a low Tg layer / a high Tg layer / a low Tg layer formed from two types of resin compositions. With such a layer structure, reworkability, step absorption, adhesive strength, and bonding reliability can be improved.
  • the shear storage elastic modulus (G') of the double-sided adhesive sheet is preferably 5 ⁇ 10 3 to 5 ⁇ 10 8 Pa, more preferably 1 ⁇ 10 4 to 1 ⁇ 10 7 Pa, and particularly preferably. It is 2 ⁇ 10 4 to 1 ⁇ 10 6 Pa.
  • the shear storage elastic modulus (G') is the shear storage elastic modulus at 25 ° C., and from the dynamic viscoelasticity spectrum data obtained by the dynamic viscoelasticity measurement in the shear mode described above, the shear storage elastic modulus at 25 ° C. Obtained by reading the rate (G').
  • the intermediate layer is higher than the shear storage elastic modulus (G') of the outermost layer and the innermost layer. It is preferable that the shear storage elastic modulus (G') is large from the viewpoint of reworkability.
  • the tensile storage elastic modulus (E') of the double-sided pressure-sensitive adhesive sheet is preferably 2.5 ⁇ 10 4 to 5 ⁇ 10 8 Pa, more preferably 5 ⁇ 10 4 to 5 ⁇ 10 7 Pa, and particularly. It is preferably 1 ⁇ 10 5 to 5 ⁇ 10 6 Pa.
  • the tensile storage elastic modulus (E') is the tensile storage elastic modulus at 25 ° C., and from the dynamic viscoelasticity spectrum data obtained by the dynamic viscoelasticity measurement in the above-mentioned tensile mode, the tensile storage elastic modulus at 25 ° C. Obtained by reading the rate (E').
  • the double-sided pressure-sensitive adhesive sheet of the present invention preferably has at least two layers having different glass transition temperatures, but the double-sided pressure-sensitive adhesive sheet having at least two layers having different glass transition temperatures is determined by tensile viscoelasticity measurement. It can be discriminated by the ratio of the obtained tensile storage elastic modulus (E') and the shear storage elastic modulus (G') obtained by the shear viscoelasticity measurement.
  • E' tensile storage elastic modulus
  • G' shear storage elastic modulus
  • the ratio (E'/ G') of the tensile storage elastic modulus (E') and the shear storage elastic modulus (G') of the double-sided pressure-sensitive adhesive sheet of the present invention is 5.0 or more, preferably 6.0 or more, more preferably. Is 7.0 or more, more preferably 8.0 or more. Further, it is preferably 100 or less, more preferably 50 or less, and further preferably 30 or less. That is, when the ratio of E'/ G'of the double-sided adhesive sheet is 5.0 or more, "having at least two layers having different glass transition temperatures" or "the glass transition temperature is inclined in the thickness direction". It can be judged as such a layer, has excellent reworkability, and is easily peeled off at the interface portion with the adherend surface of at least one of the constituent members of the image display device by the cooling operation.
  • the thickness of the double-sided pressure-sensitive adhesive sheet of the present invention is preferably 50 to 1000 ⁇ m, more preferably 60 to 500 ⁇ m, and particularly preferably 75 to 300 ⁇ m. If the thickness of the sheet is too thin, the step absorption tends to decrease, and if it is too thick, reworkability tends to be difficult to obtain.
  • the ratio of the total thickness of the outermost layer and the innermost layer to the total thickness is preferably 5 to 70%, more preferably 10 to 60%, and particularly preferably 20 to 45%.
  • the double-sided adhesive sheet of the present invention is used for bonding two components for an image display device, and specifically, a personal computer, a mobile terminal (PDA), a game machine, a television (TV), a car navigation system, and the like. It is used for bonding components of LCDs such as touch panels and pen tablets, and image display devices such as PDPs or ELs.
  • LCDs such as touch panels and pen tablets
  • image display devices such as PDPs or ELs.
  • the two components for the image display device are formed of different materials from the viewpoint of reworkability.
  • one of the two components for the image display device is glass and the other is a film, and particularly preferably the glass is reinforced glass.
  • the film is any one of the group consisting of a touch sensor, an image display panel, a surface protection panel, a polarizing film and a retardation film, or a laminate composed of a combination of two or more kinds.
  • cover glasses having a curved shape are often used from the viewpoint of design. Since such a cover glass is expensive and is a member to be reused, it can be effectively used for a cover glass having a curved shape because it is excellent in reworkability by using the double-sided adhesive sheet of the present invention.
  • LCDs liquid crystal displays
  • PDPs plasma displays
  • ELDs electroluminescence displays
  • the base material of the film is preferably a transparent resin, for example, a polyester resin, a polyolefin resin, a (meth) acrylic resin, a polyurethane resin, a polyether sulfone resin, a polycarbonate resin, or a polysulfone resin.
  • a transparent resin for example, a polyester resin, a polyolefin resin, a (meth) acrylic resin, a polyurethane resin, a polyether sulfone resin, a polycarbonate resin, or a polysulfone resin.
  • resins polyether resins, polyether ketone resins, (meth) acronitrile resins, cycloolefin resins and the like.
  • polyester resins are preferable, and polyethylene terephthalate (PET) is particularly preferable. These may be used alone or in combination of two or more.
  • An image display device laminate in which two image display device components are bonded via a double-sided adhesive sheet by bonding image display device components to both adhesive surfaces of the double-sided adhesive sheet of the present invention. Is obtained. Further, the laminated body for the image display device is usually irradiated with active energy rays and the pressure-sensitive adhesive sheet is photo-cured, so that the double-sided pressure-sensitive adhesive sheet is cured through the pressure-sensitive adhesive layer for two image display devices. A laminated body for an image display device to which the constituent members are bonded can be obtained.
  • the double-sided adhesive sheet of the present invention is preferably configured so that the two components for an image display device can be separated (separated) by a cooling operation.
  • the image display device is configured so that it can be peeled (separated) at the interface portion with the adherend surface of at least one of the constituent members of the image display device by a cooling operation.
  • peelable (separable) means that the constituent members for the image display device bonded via the double-sided adhesive sheet can be easily peeled (separated) without destroying the members, particularly. , It means that it can be peeled (separated) at the interface between the double-sided adhesive sheet and the constituent member for the image display device.
  • the cooling operation is performed by the following method.
  • the constituent members for the image display device By cooling the laminated body for the image display device, the constituent members for the image display device can be separated, and in particular, peeling occurs at the interface portion of at least one of the constituent members for the image display device with the adherend surface, and the components can be separated. .. Further, in some cases, the laminate for the image display device before irradiation with the active energy rays may be cooled and peeled off without irradiating the active energy rays. In this case as well, the component member for the image display device may be removed. Separable, in particular, peeling occurs at the interface portion with the adherend surface of at least one component for the image display device, and the image can be separated. By the above method, the components for the image display device can be easily recycled.
  • the cooling temperature of the laminate for the image display device is preferably ⁇ 50 ° C. or lower, more preferably ⁇ 80 ° C. or lower, and further preferably ⁇ 100 ° C. or lower.
  • the lower limit of the cooling temperature is not particularly limited, but is usually about ⁇ 300 ° C., preferably about ⁇ 200 ° C.
  • the laminated body for the image display device when cooling the laminated body for the image display device, it may be allowed to stand so that one of the image display constituent members of the laminated body for the image display device is in contact with the SUS cooling plate at the above cooling temperature. It is preferable, particularly preferably, to stand so that the member side having a low linear expansion coefficient of the component member for the image display device and the cooling plate made of SUS are in contact with each other.
  • the peelable time is usually 600 seconds or less, particularly preferably 300 seconds or less, more preferably 180 seconds or less, particularly preferably 120 seconds or less, still more preferably 60 seconds or less, and particularly preferably 30 seconds. Within seconds.
  • the double-sided adhesive sheet of the present invention can peel off the component (adhesive body) for the image display device by the cooling operation is considered as follows.
  • the adherend contracts as the temperature decreases, and a stress equal to the elastic modulus of the adherend ⁇ the shrinkage strain is generated. This strain or stress becomes a peeling force for separating the double-sided adhesive sheet and the adherend at the interface portion. Therefore, the two adherends in contact with the double-sided pressure-sensitive adhesive sheet are preferably made of materials having different coefficients of linear expansion, and further preferably the two adherends are made of different materials.
  • the double-sided adhesive sheet of the present invention is difficult to relax with respect to the strain or stress (difference) received from the adherend, or is difficult to be relaxed by cooling, so that the double-sided adhesive sheet has reworkability. It becomes the point of. Specifically, it is possible to raise the glass transition temperature (Tg) of the double-sided adhesive sheet. However, if the glass transition temperature (Tg) is simply increased, the adhesive performance such as step absorption, adhesive strength, and bonding reliability will deteriorate.
  • the ratio (E'/ G') of the tensile storage elastic modulus (E') and the shear storage elastic modulus (G') of the double-sided pressure-sensitive adhesive sheet is set to 5.0 or more, and further, the double-sided pressure-sensitive adhesive sheet is used.
  • the peak temperature (T1) of the loss positive tangent (Tan ⁇ ) obtained by the dynamic viscoelasticity measurement in the shear mode with a frequency of 1 Hz is set to -10 ° C or less, and the loss positive tangent obtained by the dynamic viscoelasticity measurement in the tensile mode with a frequency of 1 Hz.
  • the peak temperature (T2) of (Tan ⁇ ) is set to ⁇ 10 ° C. or higher (however, when two or more peak temperatures are observed, the highest temperature is defined as the peak temperature (T2)).
  • the double-sided pressure-sensitive adhesive sheet of the present invention having the above characteristics preferably has at least two (meth) acrylic pressure-sensitive adhesive layers, and the (meth) acrylic pressure-sensitive adhesive layer is a (meth) acrylic-based coating material. It is formed from a resin composition containing a polymer. Further, the intermediate layer in the case of having at least three layers having the outermost layer and the outermost layer as the (meth) acrylic pressure-sensitive adhesive layer is also formed from the resin composition containing the (meth) acrylic copolymer.
  • the resin composition forming the (meth) acrylic pressure-sensitive adhesive layer and the intermediate layer will be described.
  • the resin composition contains a (meth) acrylic copolymer as a main component, and further comprises a cross-linking agent (B), a photoinitiator (C), a silane coupling agent (D), and a corrosion inhibitor ( E), and other additives may be included.
  • main component means that the (meth) acrylic copolymer is contained in an amount of 50% by mass or more, preferably 70% by mass or more, and more preferably 80% by mass or more based on the entire resin composition. ..
  • (Meta) acrylic copolymer examples include those obtained by copolymerizing an alkyl (meth) acrylate monomer having an alkyl group having 4 to 18 carbon atoms and a monomer component copolymerizable therewith.
  • alkyl (meth) acrylate monomer having 4 to 18 carbon atoms of the alkyl group examples include n-butyl (meth) acrylate, pentyl (meth) acrylate, hexyl (meth) acrylate, heptyl (meth) acrylate, and n-octyl.
  • Examples of the monomer component copolymerizable with the alkyl (meth) acrylate monomer having 4 to 18 carbon atoms of the alkyl group include a hydroxyl group-containing (meth) acrylate monomer, a nitrogen atom-containing (meth) acrylate monomer, and a carboxy group-containing ( Examples thereof include a meta) acrylate monomer, an epoxy group-containing (meth) acrylate monomer, a vinyl monomer, an alkyl (meth) acrylate monomer having an alkyl group having 1 to 3 carbon atoms, and other copolymerizable monomers.
  • hydroxyl group-containing (meth) acrylate monomer examples include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxy-1-methylethyl (meth) acrylate, and 3-hydroxypropyl (meth) acrylate.
  • nitrogen atom-containing (meth) acrylate monomer examples include aminoalkyl (meth) acrylates such as aminomethyl (meth) acrylate, aminoethyl (meth) acrylate, aminopropyl (meth) acrylate, and aminoisopropyl (meth) acrylate.
  • Amino group-containing (meth) acrylate monomers such as N-alkylaminoalkyl (meth) acrylate, N, N-dimethylaminoethyl (meth) acrylate, N, N-dimethylaminopropyl (meth) acrylate, (meth) acrylamide, N , N-dimethyl (meth) acrylamide, N-butyl (meth) acrylamide, N-methylol (meth) acrylamide, N-methylolpropane (meth) acrylamide, N-methoxymethyl (meth) acrylamide, N-butoxymethyl (meth) Examples thereof include amide group-containing (meth) acrylate monomers such as acrylamide, diacetone (meth) acrylamide, maleic acid amide, and maleimide. These may be one kind or a combination of two or more kinds.
  • carboxy group-containing (meth) acrylate monomer examples include (meth) acrylic acid and (meth) acrylic acid dimer. These may be one kind or a combination of two or more kinds.
  • Examples of the epoxy group-containing (meth) acrylate monomer include glycidyl (meth) acrylate, methyl glycidyl (meth) acrylate, 3,4-epoxycyclohexylmethyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate glycidyl ether and the like. Can be mentioned. These may be one kind or a combination of two or more kinds.
  • vinyl monomer examples include (meth) acrylic acid alkyl esters having an alkyl group having 1 to 12 carbon atoms and functional monomers having a functional group such as a hydroxy group, an amide group and an alkoxylalkyl group in the molecule.
  • polyalkylene glycol di (meth) acrylates and vinyl ester monomers such as vinyl acetate, vinyl propionate and vinyl laurate and aromatic vinyls such as styrene, chlorostyrene, chloromethylstyrene, ⁇ -methylstyrene and other substituted styrenes.
  • Monomers can be mentioned. These may be one kind or a combination of two or more kinds.
  • alkyl (meth) acrylate monomer having 1 to 3 carbon atoms in the alkyl group examples include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, and i-propyl (meth) acrylate. Can be mentioned. These may be one kind or a combination of two or more kinds.
  • Examples of the other copolymerizable monomer include acid anhydride group-containing monomers such as maleic anhydride and itaconic anhydride, heterocyclic basic monomers such as vinylpyrrolidone, vinylpyridine and vinylcarbazole, and macromonomers. Be done. These may be one kind or a combination of two or more kinds.
  • a (meth) acrylic copolymer obtained by copolymerizing the above-mentioned various monomer components may be used so as to have a predetermined peak temperature of loss tangent and specific physical properties when the double-sided pressure-sensitive adhesive sheet is formed.
  • the polymerization method may be carried out according to conventionally known, for example, solution radical polymerization, suspension polymerization, bulk polymerization, emulsion polymerization and the like.
  • the outermost layer and the backmost layer are (meth) acrylic pressure-sensitive adhesive layers
  • the outermost layer and the backmost (meth) acrylic pressure-sensitive adhesive layer are It is preferably formed from a resin composition containing the (meth) acrylic copolymer (A) having a glass transition temperature of ⁇ 10 ° C. or lower, and more preferably the (meth) acrylic copolymer contained in the resin composition.
  • the polymer is composed of only the (meth) acrylic copolymer (A).
  • the (meth) acrylic copolymer (A) having a glass transition temperature of ⁇ 10 ° C. or lower does not substantially contain a structural unit derived from a carboxy group-containing (meth) acrylate monomer, and the (meth) acrylic At least one polar group-containing (meth) acrylate monomer (a2) selected from the group consisting of a hydroxyl group-containing (meth) acrylate monomer and a nitrogen atom-containing (meth) acrylate monomer as a monomer component constituting the system copolymer (A).
  • a (meth) acrylate monomer (a1) having a glass transition temperature (Tg) of less than ⁇ 30 ° C. when a homopolymer is formed from a monomer component, which is a monomer other than the above (a2). Is preferable.
  • the above-mentioned "substantially free of the structural unit derived from the carboxy group-containing (meth) acrylate monomer” is not only when it is completely not contained, but also when it is completely contained, the carboxy is contained in the (meth) acrylic copolymer (A).
  • the group-containing (meth) acrylate monomer is contained in an amount of less than 0.5% by mass, preferably less than 0.1% by mass.
  • the glass transition temperature (Tg) when a homopolymer is formed from the above-mentioned monomer components is less than -30 ° C (preferably less than -40 ° C, particularly preferably less than -50 ° C).
  • Tg glass transition temperature
  • alkyl (meth) acrylate monomers having an alkyl group having 4 to 18 carbon atoms those having a glass transition temperature of less than ⁇ 30 ° C. can be mentioned.
  • Linear alkyl (meth) acrylate monomer; branched alkyl (meth) acrylate monomer such as 2-ethylhexyl acrylate, isononyl acrylate, and isodecyl acrylate can be mentioned. These may be one kind or a combination of two or more kinds. Of these, branched alkyl (meth) acrylate is preferable, and 2-ethylhexyl acrylate is particularly preferable.
  • Examples of the polar group-containing (meth) acrylate monomer (a2) include the above-mentioned hydroxyl group-containing (meth) acrylate monomer and nitrogen atom-containing (meth) acrylate monomer, and among them, the hydroxyl group-containing (meth) acrylate monomer is preferable, 2-. Hydroxyethyl acrylate is particularly preferred.
  • the copolymerization component of the (meth) acrylic copolymer (A) a monomer other than the above-mentioned monomers (a1) and (a2) can be used.
  • the monomers other than the above-mentioned monomers (a1) and (a2) the above-mentioned various monomers can be used, and among them, an alkyl (meth) acrylate monomer having an alkyl group having 1 to 3 carbon atoms is preferably used, and methyl (meth) It is particularly preferable to use a meta) acrylate.
  • the glass transition temperature of the (meth) acrylic copolymer (A) obtained by copolymerizing these is preferably ⁇ 10 ° C. or lower, more preferably ⁇ 100 to ⁇ 100, from the viewpoint of step absorption and bonding reliability. -15 ° C, particularly preferably -50 to -20 ° C.
  • the mass average molecular weight of the (meth) acrylic copolymer (A) is preferably 50,000 to 1,500,000, more preferably 100,000 to 700,000, and particularly preferably 150,000 to 600,000.
  • the mass average molecular weight is measured by the following method. Using a gel permeation chromatography (GPC) analyzer (HLC-8320GPC manufactured by Toso Co., Ltd.) as a measurement sample in which 4 mg of a (meth) acrylic copolymer was dissolved in 12 mL of THF, the following conditions were met. Measure the molecular weight distribution curve with, and obtain the mass average molecular weight (Mm).
  • GPC gel permeation chromatography
  • TSKguardvolumeHXL -Separation column TSKgelGMHXL (4) ⁇ Temperature: 40 °C ⁇ Injection amount: 100 ⁇ L ⁇ Polystyrene conversion ⁇ Solvent: THF ⁇ Flow velocity: 1.0 mL / min
  • the hydroxyl value of the (meth) acrylic copolymer (A) is usually 20 to 150 mgKOH / g, preferably 30 to 100 mgKOH / g, and more preferably 40 to 80 mgKOH / g.
  • the intermediate layer (the layer sandwiched between the outermost layer and the innermost layer) is , It is preferably formed from a resin composition containing a (meth) acrylic copolymer (A') having a glass transition temperature higher than ⁇ 10 ° C., and more preferably (meth) acrylic contained in the resin composition.
  • the system copolymer is composed of only the (meth) acrylic copolymer (A').
  • the (meth) acrylic copolymer (A') having a glass transition temperature higher than ⁇ 10 ° C. contains a hydroxyl group (meth) as a monomer component constituting the (meth) acrylic copolymer (A').
  • Examples of the polar group-containing (meth) acrylate monomer (a2) include the above-mentioned hydroxyl group-containing (meth) acrylate monomer and nitrogen atom-containing (meth) acrylate monomer. Among them, nitrogen atom-containing (meth) acrylate is preferable and more preferable. Is an amide group-containing (meth) acrylate, particularly preferably (meth) acrylamide.
  • the alkyl (meth) acrylate monomer (a3) having an alkyl group having 1 to 18 carbon atoms includes the above-mentioned alkyl (meth) acrylate monomer having an alkyl group having 4 to 18 carbon atoms and an alkyl group having 1 to 18 carbon atoms.
  • Examples of the alkyl (meth) acrylate monomer of 3 include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, and isobutyl (meth) acrylate.
  • the copolymerization component of the (meth) acrylate-based copolymer (A') a monomer other than the above-mentioned monomers (a2) and (a3) can be used.
  • the monomers other than the monomers (a2) and (a3) the above-mentioned various monomers can be used.
  • the glass transition temperature of the (meth) acrylic copolymer (A') obtained by copolymerizing these is preferably higher than ⁇ 10 ° C., more preferably ⁇ 5 to 20 ° C. from the viewpoint of reworkability. , Especially preferably 0 to 15 ° C.
  • the mass average molecular weight of the (meth) acrylic copolymer (A') is preferably 50,000 to 1,000,000, particularly 70,000 to 700,000, and particularly preferably 100,000 to 500,000.
  • the resin composition forming each layer may contain a cross-linking agent (B) in addition to the above (meth) acrylic copolymer.
  • a cross-linking agent (B) in addition to the above (meth) acrylic copolymer.
  • cross-linking agent (B) a cross-linking agent having at least a double bond cross-linking is preferable.
  • at least one crosslinkable functional group selected from (meth) acryloyl group, epoxy group, isocyanate group, carboxy group, hydroxy group, carbodiimide group, oxazoline group, aziridine group, vinyl group, amino group, imino group and amide group.
  • a cross-linking agent having a group can be mentioned, and one kind or a combination of two or more kinds may be used.
  • the cross-linking agent (B) also includes an embodiment in which the cross-linking agent (B) is chemically bonded to the (meth) acrylic copolymer.
  • a cross-linking agent having a (meth) acryloyl group is preferable, and a polyfunctional (meth) acrylate is particularly preferable in terms of cutting processability and bonding reliability.
  • polyfunctional refers to one having two or more crosslinkable functional groups. If necessary, it may have 3 or more and 4 or more crosslinkable functional groups. Further, the crosslinkable functional group may be protected by a deprotectable protecting group.
  • polyfunctional (meth) acrylate examples include 1,4-butanediol di (meth) acrylate, glycerin di (meth) acrylate, neopentyl glycol di (meth) acrylate, and glycering ricidyl ether di (meth) acrylate, 1.
  • the content of the cross-linking agent (B) is usually 0.5 to 50 parts by mass, preferably 1 to 40 parts by mass, and particularly preferably 5 to 30 parts by mass with respect to 100 parts by mass of the (meth) acrylic copolymer. It is a mass part. When such a content is within the above range, cutting processability and bonding reliability can be easily obtained, which is preferable.
  • the resin composition preferably contains a photopolymerization initiator (C).
  • a photopolymerization initiator As the photopolymerization initiator (C), currently known ones can be appropriately used, and among them, a photopolymerization initiator that is sensitive to ultraviolet rays having a wavelength of 380 nm or less is used from the viewpoint of easy control of the cross-linking reaction. preferable.
  • the photopolymerization initiator (C) is roughly classified into two types according to the radical generation mechanism.
  • the photopolymerization initiator and the hydrogen donor in the system form an excitation complex, and the photopolymerization initiator is roughly classified into a hydrogen abstraction type photopolymerization initiator capable of transferring the hydrogen of the hydrogen donor.
  • the cleavage-type photopolymerization initiator is decomposed into another compound when a radical is generated by light irradiation, and once excited, it loses its function as a reaction initiator. Therefore, it is preferable because it does not remain as an active species in the cured product such as an adhesive after the cross-linking reaction is completed, and there is no possibility of causing unexpected photodegradation or the like in the cured product.
  • the hydrogen abstraction-type photopolymerization initiator does not generate a decomposition product like a cleaving-type photopolymerization initiator during a radical generation reaction by irradiation with active energy rays such as ultraviolet rays, and therefore is less likely to become a volatile component after the reaction is completed. It is useful in that it can reduce damage to the body.
  • cleavage-type photopolymerization initiator examples include 2,2-dimethoxy-1,2-diphenylethane-1-one, 1-hydroxycyclohexylphenylketone, and 2-hydroxy-2-methyl-1-phenyl-propane-.
  • Examples of the hydrogen abstraction type photopolymerization initiator include benzophenone, 4-methylbenzophenone, 2,4,6-trimethylbenzophenone, 4-phenylbenzophenone, 3,3'-dimethyl-4-methoxybenzophenone, and 2-benzoyl benzoene.
  • Methyl acid methyl benzoylate, bis (2-phenyl-2-oxoacetic acid) oxybisethylene, 4- (1,3-acryloyl-1,4,7,10,13-pentaoxotridecyl) benzophenone, thioxanthone, Examples thereof include 2-chlorothioxanthone, 3-methylthioxanthone, 2,4-dimethylthioxanthone, 2-methylanthraquinone, 2-ethylanthraquinone, 2-tert-butylanthraquinone, 2-aminoanthraquinone and derivatives thereof. Of these, 4-methylbenzophenone and 2,4,6-trimethylbenzophenone are preferable.
  • the photopolymerization initiator (C) is not limited to the substances listed above. Further, as the photopolymerization initiator (C), any one of a cleavage type photopolymerization initiator and a hydrogen abstraction type photopolymerization initiator may be used, or both may be used in combination.
  • the content of the photopolymerization initiator (C) is not particularly limited, but is usually 0.1 to 10 parts by mass with respect to 100 parts by mass of the (meth) acrylic copolymer, preferably 0. It is 2 to 5 parts by mass, particularly preferably 0.3 to 3 parts by mass.
  • silane Coupling Agent (D) Further, it is preferable to add a silane coupling agent (D) to the resin composition in order to enhance the adhesiveness to the constituent members for the image display device, particularly to glass. Above all, the silane coupling agent (D) is preferably contained in the resin composition that forms the (meth) acrylic pressure-sensitive adhesive layer in contact with the component for the image display device of the double-sided pressure-sensitive adhesive sheet.
  • the silane coupling agent (D) includes, for example, a compound having a hydrolyzable functional group such as an alkoxy group as well as an unsaturated group such as a vinyl group, an acryloxy group and a methacryloxy group, an amino group and an epoxy group. Can be mentioned.
  • Examples of the silane coupling agent (D) include N- ( ⁇ -aminoethyl) - ⁇ -aminopropyltrimethoxysilane, N- ( ⁇ -aminoethyl) - ⁇ -aminopropylmethyldimethoxysilane, and ⁇ -amino.
  • Examples thereof include propyltriethoxysilane, ⁇ -glycidoxypropyltrimethoxysilane, and ⁇ -methacryloxypropyltrimethoxysilane. These may be used alone or in combination of two or more. Of these, ⁇ -glycidoxypropyltrimethoxysilane is preferable from the viewpoints of good adhesiveness to constituent members for image display devices and less discoloration such as yellowing.
  • the content of the silane coupling agent (D) is preferably 0.01 to 5 parts by mass, particularly preferably 0.2 to 3 parts by mass with respect to 100 parts by mass of the (meth) acrylic copolymer. be.
  • a coupling agent such as an organic titanate compound can be effectively used.
  • the resin composition contains a metal corrosion inhibitor (E).
  • the metal corrosion inhibitor (E) is preferably contained in the resin composition that forms the (meth) acrylic pressure-sensitive adhesive layer in contact with the component for the image display device of the double-sided pressure-sensitive adhesive sheet.
  • metal corrosion inhibitor (E) examples include benzotriazole compounds, benzimidazole compounds, benzothiazole compounds, and other triazole derivatives.
  • the metal corrosion inhibitor is preferably at least one selected from benzotriazole compounds, 1,2,3-triazole and 1,2,4-triazole.
  • benzotriazole compounds 1,2,3-triazole and 1,2,4-triazole.
  • triazole derivatives such as 1,2,3-triazole and 1,2,4-triazole are preferable, and 1,2,3-triazole is particularly preferable because they are excellent in reliability as a double-sided pressure-sensitive adhesive sheet in addition to metal corrosion prevention. Is preferable.
  • the content of the metal corrosion inhibitor (E) is 0.01 to 5 with respect to 100 parts by mass of the (meth) acrylic copolymer from the viewpoint of bleeding out of the metal corrosion inhibitor and the effect of preventing metal corrosion. It is preferably parts by mass, more preferably 0.03 to 1 part by mass, and particularly preferably 0.05 to 0.5 parts by mass.
  • the resin composition may contain other additives.
  • the other additives include a light stabilizer, an ultraviolet absorber, a metal inactivating agent, an antiaging agent, an antistatic agent, a hygroscopic agent, a foaming agent, an antifoaming agent, an inorganic particle, and a viscosity modifier.
  • various additives such as antistatic resins, photosensitizers and fluorescent agents, reaction catalysts (tertiary amine compounds, quaternary ammonium compounds, tin lauryl acid compounds, etc.) and the like. These may be used alone or in combination of two or more.
  • other known components which are usually blended in the resin composition forming the pressure-sensitive adhesive, may be appropriately contained.
  • the resin composition includes a (meth) acrylic copolymer, a cross-linking agent (B), a photopolymerization initiator (C), a silane coupling agent (D), a metal corrosion inhibitor (E), and a metal corrosion inhibitor (E), if necessary. It is obtained by mixing a predetermined amount of each of the other additives.
  • the mixing method thereof is not particularly limited, and the mixing order of each component is not particularly limited.
  • a heat treatment step may be added at the time of manufacturing the resin composition. In this case, it is desirable to mix each component of the resin composition in advance and then perform the heat treatment. In the above mixing, a masterbatch obtained by concentrating various mixed components may be used.
  • the mixing method is not particularly limited, and for example, a universal kneader, a planetary mixer, a Banbury mixer, a kneader, a gate mixer, a pressurized kneader, a three-roll, a two-roll, or the like can be used.
  • a solvent may be used if necessary.
  • the resin composition can also be used as a solvent-free system that does not contain a solvent. By using it as a solvent-free system, it is possible to have an advantage that the solvent does not remain and the heat resistance and the light resistance are improved.
  • the double-sided pressure-sensitive adhesive sheet of the present invention preferably has at least two (meth) acrylic pressure-sensitive adhesive layers, and more preferably at least three having the outermost layer and the backmost layer as (meth) acrylic pressure-sensitive adhesive layers. It has a layer.
  • the double-sided pressure-sensitive adhesive sheet of the present invention is typically produced as a double-sided pressure-sensitive adhesive sheet with a release film having a structure in which a double-sided pressure-sensitive adhesive sheet and a release film are laminated by the following steps. The pre-curing in the following steps may be omitted.
  • a (meth) acrylic pressure-sensitive adhesive layer (or intermediate layer) with a release film is prepared.
  • the (meth) acrylic pressure-sensitive adhesive layer (or intermediate layer) with a release film is obtained by applying a heat-melted (hot melt) resin composition onto a release film to further apply another release film. It can be obtained by sandwiching it with and heating it.
  • This (meth) acrylic pressure-sensitive adhesive layer (or intermediate layer) with a release film is prepared according to the number of layers required by the double-sided pressure-sensitive adhesive sheet.
  • the release film examples include a film made of polyester resin, polyolefin resin, polycarbonate resin, polystyrene resin, acrylic resin, triacetyl cellulose resin, fluororesin and the like. Further, those obtained by applying a silicone resin to these films and performing a mold release treatment, a mold release paper, or the like can also be appropriately selected and used. Among these, polyester resin and polyolefin resin are preferable, and mold release-treated polyester resin and polyolefin resin are particularly preferable. Further, it is also preferable to use a release film having a different peeling force or a release film having a different thickness on both sides of the (meth) acrylic pressure-sensitive adhesive layer.
  • the release film is peeled off from the obtained (meth) acrylic pressure-sensitive adhesive layer (or intermediate layer) with a release film, and the (meth) acrylic pressure-sensitive adhesive layer (or intermediate layer) is laminated.
  • the double-sided adhesive sheet of the present invention in which the release film is laminated can be obtained.
  • the double-sided adhesive sheet has at least three layers in which the outermost layer and the innermost layer are (meth) acrylic adhesive layers, for example, the outermost layer (adhesive layer) / intermediate layer / innermost layer (
  • the above resin composition is applied onto a release film to form an outermost layer, and a resin composition for forming an intermediate layer is formed on the formed outermost layer.
  • a method of coating an object to form an intermediate layer and further forming an outermost layer on the formed intermediate layer, or a resin composition is applied onto a release film in the same manner as described above to form an outermost layer.
  • the adhesive sheet is formed by forming an intermediate layer and then laminating the coated surfaces to each other, or by simultaneously forming the outermost layer and the intermediate layer of the resin composition by multi-layer coating or coextrusion molding. Can be produced.
  • a resin composition is applied onto a release film to form a (meth) acrylic pressure-sensitive adhesive layer, and then the formed (meth) acrylic pressure-sensitive adhesive layer is subjected to.
  • a multi-layer double-sided pressure-sensitive adhesive sheet can also be produced by repeatedly applying another resin composition to form a resin layer or the like.
  • the obtained double-sided pressure-sensitive adhesive sheet is pre-cured by cross-linking with active energy rays so as to have potential active energy ray reactivity, in other words, leaving active energy ray reactivity.
  • the active energy rays may be irradiated through the release film to crosslink each layer with the active energy rays.
  • the double-sided adhesive sheet obtained in this way is an optically transparent transparent adhesive sheet.
  • optically transparent is intended to have a total light transmittance of 80% or more, preferably 85% or more, and more preferably 90% or more.
  • the double-sided pressure-sensitive adhesive sheet of the present invention is usually distributed in a state where both-sided (meth) acrylic pressure-sensitive adhesive layers are sandwiched between release films. Then, when the double-sided pressure-sensitive adhesive sheet is used, the release film may be peeled off from the (meth) acrylic pressure-sensitive adhesive layer, and the (meth) acrylic pressure-sensitive adhesive layer may be attached to the image display component.
  • a "sheet” is a thin product according to the definition in JIS, and its thickness is small and flat for its length and width.
  • a "film” is compared to its length and width.
  • Japanese Industrial Standard JIS K6900 Japanese Industrial Standard JIS K6900
  • the boundary between the sheet and the film is not clear, and it is not necessary to distinguish between the two in the present invention. Therefore, in the present invention, even when the term “film” is used, the term “sheet” is included and the term “sheet” is used. Even if it is, it shall include “film”.
  • panel when the term "panel” is used as in the case of an image display panel, a protective panel, etc., it includes a plate body, a sheet, and a film.
  • x to y (x, y are arbitrary numbers) is described, it means “x or more and y or less", and “preferably larger than x", “preferably larger than x", unless otherwise specified. It also includes the meaning of “less than y”. Further, when “x or more” (x is an arbitrary number) is described, it includes the meaning of “x or more” and “preferably greater than x” as well as “y or less” (y) unless otherwise specified. Is an arbitrary number), which includes not only the meaning of “y or less” but also the meaning of "preferably smaller than y” unless otherwise specified.
  • the hydroxyl value, mass average molecular weight, and glass transition temperature of the (meth) acrylic copolymer are measured by the following methods.
  • Mass average molecular weight The mass average molecular weight of the (meth) acrylic copolymer was measured using a gel permeation chromatography (GPC) analyzer (HLC-8320 GPC, manufactured by Tosoh Corporation). Specifically, a 4 mg (meth) acrylic copolymer dissolved in 12 mL of THF was used as a measurement sample, and the molecular weight distribution curve was measured under the following conditions to determine the mass average molecular weight (Mw). I asked.
  • GPC gel permeation chromatography
  • TSKguardvolumeHXL -Separation column TSKgelGMHXL (4) ⁇ Temperature: 40 °C ⁇ Injection amount: 100 ⁇ L ⁇ Polystyrene conversion ⁇ Solvent: THF ⁇ Flow velocity: 1.0 mL / min
  • Tg Glass transition temperature
  • the glass transition temperature (Tg) of the (meth) acrylic copolymer was measured using a rheometer (“Discovery HR2” manufactured by TA Instruments). Specifically, for a (meth) acrylic copolymer having a thickness of 0.6 to 0.8 mm, a jig: ⁇ 8 mm parallel plate, strain: 0.1%, frequency: 1 Hz, temperature: -120 to 200 ° C. , Temperature rise rate: Measure the dynamic viscoelastic spectrum in the temperature range of -120 to 200 ° C. under the condition of 5 ° C./min, and read the temperature at which the loss tangent (Tan ⁇ ) becomes the maximum value from the obtained data. Therefore, the glass transition temperature (Tg) was determined.
  • a (meth) acrylic copolymer a copolymer composed of 2-ethylhexyl acrylate / methyl acrylate / methyl methacrylate / isobornyl methacrylate / acrylamide (A'-1) [mass average molecular weight 290,000, Tg 4 ° C.] 1 kg. , 100 g of propoxylated pentaerythritol triacrylate (B-1) as the cross-linking agent (B), and a mixture (C-1) of 2,4,6-trimethylbenzophenone and 4-methylbenzophenone as the photopolymerization initiator (C). ) 5 g was uniformly melt-kneaded to prepare a resin composition 1.
  • (meth) acrylic copolymer a copolymer composed of 2-ethylhexyl acrylate / 2-hydroxyethyl acrylate / methyl acrylate (A-1) [mass average molecular weight 440,000, Tg-25 ° C., hydroxyl value 67 mgKOH / g ] 1 kg, 10 g of (C-1) as the photopolymerization initiator (C), and 1 g of 3-glycidoxypropyltrimethoxysilane (D-1) as the silane coupling agent (D) are uniformly melted.
  • the resin composition 2 was produced by kneading.
  • the intermediate layer sheet (1) from which the release films on both sides have been peeled off is attached to the adhesive surfaces of the front and back layer adhesive sheets (2) from which the release films on one side have been peeled off, and (2) / (1) / ( A laminated body having the layer structure of 2) was produced.
  • the double-sided adhesive sheet (pre-cured product) of Example 1 was prepared.
  • the shear storage elastic modulus (G') of the front and back layers at a temperature of 25 ° C. is lower than the shear storage elastic modulus (G') of the intermediate layer, and all the layers are light. There was room for photocuring by irradiation.
  • Example 2 1 kg of (A-1) as a (meth) acrylic copolymer, 10 g of (C-1) as a photopolymerization initiator (C), and 1,2,3- as a metal corrosion inhibitor (E). 1 g of triazole (E-1) was uniformly melt-kneaded to prepare a resin composition 3.
  • the absorption coefficient of (E-1) as a metal corrosion inhibitor was 0.3 mL / (g ⁇ cm) at 365 nm, and the water solubility at 25 ° C. was higher than 1000 g / L.
  • the intermediate layer sheet (1) from which the release films on both sides have been peeled off is attached to the adhesive surface of the front and back layer adhesive sheets (3) from which the release film on one side has been peeled off, and (3) / (1) / ( A laminate having the layer structure of 3) was produced.
  • the release film remaining on the surface of the front and back layer adhesive sheet (3) light is irradiated with a high-pressure mercury lamp so that the integrated light amount at a wavelength of 365 nm is 1000 mJ / cm 2, and pre-cured.
  • a double-sided adhesive sheet (pre-cured product) of Example 2 was prepared.
  • the shear storage elastic modulus (G') of the front and back layers at a temperature of 25 ° C. is lower than the shear storage elastic modulus (G') of the intermediate layer, and all the layers are light. There was room for photocuring by irradiation.
  • Example 3 1 kg of (A'-1) as a (meth) acrylic copolymer, 100 g of (B-1) as a cross-linking agent (B), and 4 g of (C-1) as a photopolymerization initiator (C).
  • Oligo (2-hydroxy-2-methyl-1- (4- (1-methylvinyl) phenyl) propanone) (C-2) 4 g was uniformly melt-kneaded to prepare a resin composition 4.
  • Two polyethylene terephthalate films released from the resin composition 4 (“Diafoil MRF (thickness 75 ⁇ m)” manufactured by Mitsubishi Chemical Corporation / "Diafoil MRT (thickness 38 ⁇ m)” manufactured by Mitsubishi Chemical Corporation), That is, it was sandwiched between two release films and shaped into a sheet at a temperature of 80 ° C. so as to have a thickness of 75 ⁇ m to prepare a sheet (4) for an intermediate layer.
  • Two polyethylene terephthalate films obtained by releasing the resin composition 2 produced in Example 1 (“Diafoil MRF (thickness 75 ⁇ m)” manufactured by Mitsubishi Chemical Corporation / "Diafoil MRT (thickness)” manufactured by Mitsubishi Chemical Corporation. 38 ⁇ m) ”), that is, it was sandwiched between two release films and shaped into a sheet at a temperature of 80 ° C. so as to have a thickness of 13 ⁇ m to prepare two adhesive sheets (2) for front and back layers.
  • the intermediate layer sheet (4) from which the release films on both sides have been peeled off is attached to the adhesive surface of the front and back layer adhesive sheets (2) from which the release film on one side has been peeled off, and (2) / (4) / ( A laminate having the layer structure of 2) was produced.
  • the release film remaining on the surface of the front and back layer adhesive sheet (2) light is irradiated with a high-pressure mercury lamp so that the integrated light amount at a wavelength of 365 nm is 1000 mJ / cm 2, and pre-cured.
  • a double-sided adhesive sheet (pre-cured product) of Example 3 was prepared.
  • the shear storage elastic modulus (G') of the front and back layers at a temperature of 25 ° C. is lower than the shear storage elastic modulus (G') of the intermediate layer, and all the layers are light. There was room for photocuring by irradiation.
  • ⁇ Comparative example 1 1 kg of (A-1) as a (meth) acrylic copolymer, 200 g of (B-1) as a cross-linking agent (B), and 8 g of (C-1) as a photopolymerization initiator (C).
  • the resin composition 5 was produced by uniformly melt-kneading.
  • the intermediate layer sheet (5) from which the release films on both sides have been peeled off is attached to the adhesive surface of the surface layer adhesive sheet (6) from which the release film on one side has been peeled off, and (6) / (5) / (6). ) was prepared.
  • the double-sided adhesive sheet (pre-cured product) of Example 1 was prepared.
  • the shear storage elastic modulus (G') of the front and back layers at a temperature of 25 ° C. is lower than the shear storage elastic modulus (G') of the intermediate layer, and all the layers are light. There was room for photocuring by irradiation.
  • Two polyethylene terephthalate films obtained by mold-releasing the resin composition 7 (“Diafoil MRF (thickness 75 ⁇ m)” manufactured by Mitsubishi Chemical Co., Ltd./“ Diafoil MRT (thickness 38 ⁇ m) ”manufactured by Mitsubishi Chemical Co., Ltd.), that is, It is sandwiched between two release films, shaped into a sheet at a temperature of 80 ° C. so that the thickness is 100 ⁇ m, and from one release film side, high pressure is applied so that the integrated light amount at a wavelength of 365 nm is 1000 mJ / cm 2.
  • a double-sided adhesive sheet (pre-cured product) of Comparative Example 2 was prepared by irradiating light with a mercury lamp and pre-curing.
  • the (meth) acrylic pressure-sensitive adhesive layer in the double-sided pressure-sensitive adhesive sheet of Comparative Example 2 had room for photo-curing by light irradiation.
  • a copolymer 1 composed of methyl acrylate / ethyl acrylate / 2-ethylhexyl acrylate / 2-hydroxyethyl acrylate (mass average molecular weight 540,000, Tg 1 ° C., hydroxyl value 62 mgKOH / g) 1 kg, 100 g of polypropylene glycol diacrylate (B-2, molecular weight 536) as the cross-linking agent (B), 10 g of (C-1) as the photopolymerization initiator (C), and (D) as the additive (D). -1) 1 g and 1 g were uniformly melt-kneaded to prepare a resin composition 8.
  • Two polyethylene terephthalate films obtained by mold-releasing the resin composition 8 (“Diafoil MRF (thickness 75 ⁇ m)” manufactured by Mitsubishi Chemical Co., Ltd./“ Diafoil MRT (thickness 38 ⁇ m) ”manufactured by Mitsubishi Chemical Co., Ltd.), that is, It is sandwiched between two release films, shaped into a sheet at a temperature of 80 ° C. so that the thickness is 100 ⁇ m, and from one release film side, high pressure is applied so that the integrated light amount at a wavelength of 365 nm is 1000 mJ / cm 2.
  • a double-sided pressure-sensitive adhesive sheet (pre-cured product) of Comparative Example 3 was prepared by irradiating light with a mercury lamp and pre-curing.
  • the (meth) acrylic pressure-sensitive adhesive layer in the double-sided pressure-sensitive adhesive sheet of Comparative Example 3 had room for photo-curing by light irradiation.
  • ⁇ Comparative example 4 1 kg of (A-1) as a (meth) acrylic copolymer, 180 g of (B-3) as a cross-linking agent (B), and 10 g of (C-1) as a photopolymerization initiator (C).
  • the resin composition 9 was produced by uniformly melt-kneading.
  • Two polyethylene terephthalate films obtained by releasing the resin composition 10 (“Diafoil MRF (thickness 75 ⁇ m)” manufactured by Mitsubishi Chemical Corporation / "Diafoil MRT (thickness 38 ⁇ m)” manufactured by Mitsubishi Chemical Corporation), that is, It was sandwiched between two release films and shaped into a sheet at a temperature of 80 ° C. so as to have a thickness of 17 ⁇ m to prepare two adhesive sheets (10) for front and back layers.
  • the intermediate layer sheet (9) from which the release films on both sides have been peeled off is attached to the adhesive surface of the front and back layer adhesive sheets (10) from which the release film on one side has been peeled off, and (10) / (9) / ( A laminated body having the layer structure of 10) was produced.
  • the release film remaining on the surface of the front and back layer adhesive sheet (10) light is irradiated with a high-pressure mercury lamp so that the integrated light amount at a wavelength of 365 nm is 2000 mJ / cm 2, and pre-cured for comparison.
  • a double-sided adhesive sheet (pre-cured product) of Example 4 was prepared.
  • the shear storage elastic modulus (G') of the front and back layers at a temperature of 25 ° C. is lower than the shear storage elastic modulus (G') of the intermediate layer, and all the layers are light. There was room for photocuring by irradiation.
  • T1 shear storage elastic modulus (G') and loss tangent (Tan ⁇ )>
  • the release film of No. 1 was peeled off, and the adhesive sheets were laminated so as to have a thickness of 0.6 to 0.8 mm, and punched into a circle having a diameter of 8 mm as a measurement sample.
  • the double-sided pressure-sensitive adhesive sheet after curing was prepared by irradiating the pre-cured double-sided pressure-sensitive adhesive sheet with light with a high-pressure mercury lamp and photo-curing so that the integrated light amount at a wavelength of 365 nm was 3000 mJ / cm 2.
  • the two release films were peeled off in the same manner as described above, and the adhesive sheet had a thickness of 0.
  • the sample was laminated to a size of 6 to 0.8 mm and punched into a circle with a diameter of 8 mm as a measurement sample.
  • the dynamic viscoelastic spectrum of this measurement sample in the shearing mode was measured under the same measurement conditions as the pre-cured double-sided pressure-sensitive adhesive sheet, and from the obtained data, the storage elastic modulus of the post-cured double-sided pressure-sensitive adhesive sheet at a temperature of 25 ° C. I asked for (G').
  • the temperature at which the loss tangent (Tan ⁇ ) of the obtained dynamic viscous spectrum data becomes the maximum value, that is, the peak temperature (T1) was read.
  • the above bonded product is autoclaved (60 ° C., gauge pressure 0.2 MPa, 20 minutes) for finish bonding, and the integrated light amount at 365 nm is 3000 mJ / cm 2 from the PET film surface using a high-pressure mercury lamp.
  • the sample was cured at a temperature of 23 ° C. and 50% RH for 12 hours to prepare a sample for measuring 180 ° peel adhesive strength.
  • the peeling force (N / 20 mm) when peeled at a peeling angle of 180 ° and a peeling speed of 300 mm / min was measured in an environment of a temperature of 23 ° C. and 50% RH. Then, those having a thickness of less than 5N / 20 mm and easily peeling off were judged to be "x (poor)", and those having a thickness of 5N / 20 mm or more were judged to be " ⁇ (good)”.
  • a sample for evaluation of reworkability (soda lime glass plate / double-sided adhesive sheet / adhesive polarizing plate / PET film) was prepared. These are placed on a SUS cooling plate (surface temperature -120 ° C.) so that the soda lime glass plate is in contact with the cooling plate (so that the soda lime glass plate is on the lower side), and the soda lime glass plate is polarized. The time until the plates separated was measured. Five samples for evaluation of reworkability were prepared for each double-sided pressure-sensitive adhesive sheet, each sheet was measured five times, and evaluated as follows based on the average value of the time until separation.
  • soda lime glass plate (82 mm ⁇ 54 mm ⁇ thickness 0.5 mm) having no printing step is press-bonded, and then autoclaved (60 ° C., gauge pressure 0.2 MPa, 20 minutes) is performed.
  • a laminate silica glass plate with printing step / double-sided adhesive sheet / soda lime glass plate was prepared by applying and finishing and pasting.
  • the prepared laminate was visually observed and evaluated as follows.
  • the double-sided adhesive sheet did not follow the printing step and bubbles remained, so the one that was not suitable for printing step bonding was "x (usual)", and the printing step 15 ⁇ m had no bubbles and the appearance was good.
  • Those in which air bubbles remained at 25 ⁇ m were evaluated as “ ⁇ (good)”, and those in which the printing steps of 15 ⁇ m and 25 ⁇ m had no air bubbles and could be bonded with good appearance were evaluated as “ ⁇ (very good)”.
  • each double-sided adhesive sheet bonded to the soda lime glass plate 1 was peeled off, and the protective film on the polarizing plate side was peeled off and bonded to the polarizing plate by a hand roll.
  • autoclave treatment 60 ° C., gauge pressure 0.2 MPa, 20 minutes
  • the integrated light amount at 365 nm was 3000 mJ / cm 2 from the soda lime glass plate 1 side using a high-pressure mercury lamp.
  • the pressure-sensitive adhesive sheet was photo-cured by irradiating light so as to be (post-cured product).
  • room temperature 23 ° C.
  • a sample for heat-resistant foamability evaluation was prepared.
  • ⁇ ITO corrosion resistance> As shown in FIG. 1A, on a glass having a thickness of 60 mm ⁇ 45 mm and a thickness of 0.7 mm, a line width of 70 ⁇ m / line spacing of 30 ⁇ m (patterning accuracy ⁇ 8 ⁇ m), a line length of 46 cm, an electrode size of 5 mm ⁇ 5 mm, and an electrode An ITO corrosion resistance evaluation substrate having an ITO 200 ⁇ film formed under a patterning condition with a distance of 50 mm was prepared.
  • the single-sided release film was peeled off, and the PET film (manufactured by Mitsubishi Chemical Corporation, "Diafoil T100", thickness 50 ⁇ m) was peeled off. ), And then cut to a width of 52 mm. After that, the release film on the other side is peeled off, and the adhesive sheet is attached to the substrate with a roll so that the adhesive sheet is located between the electrodes, and then autoclaved (temperature 60 ° C., gauge pressure 0.2 MPa, 20 minutes). Finished and pasted.
  • ⁇ Cu corrosion resistance> As shown in FIG. 1 (A), on a glass having a thickness of 60 mm ⁇ 45 mm and a thickness of 0.7 mm, a line width of 70 ⁇ m / line spacing of 30 ⁇ m (patterning accuracy ⁇ 8 ⁇ m), a line length of 46 cm, an electrode size of 5 mm ⁇ 5 mm, and an electrode A substrate for evaluating Cu corrosion resistance was prepared in which ITO 1300 ⁇ and copper (Cu) 3000 ⁇ were formed in this order under a patterning condition with a distance of 50 mm.
  • the single-sided release film was peeled off, and the PET film (manufactured by Mitsubishi Chemical Corporation, "Diafoil T100", thickness 50 ⁇ m) was peeled off. ), And then cut to a width of 52 mm. After that, the release film on the other side is peeled off, and the adhesive sheet is attached to the substrate with a roll so that the adhesive sheet is located between the electrodes, and then autoclaved (temperature 60 ° C., gauge pressure 0.2 MPa, 20 minutes). Finished and pasted.
  • the double-sided adhesive sheets of Examples 1 to 3 have a ratio of tensile storage elastic modulus (E') to shear storage elastic modulus (G') of 5.0 or more, and dynamic viscoelasticity measurement in a shear mode with a frequency of 1 Hz.
  • the peak temperature (T1) of the loss tangent (Tan ⁇ ) obtained by Since the temperature is higher than ° C. and the adhesive strength is 5 N / 20 mm or higher, the reworkability is excellent while having step absorption, reliability, and metal corrosion resistance.
  • the transparent double-sided pressure-sensitive adhesive sheet laminates of Examples 2 to 3 were particularly excellent in reworkability and metal corrosion resistance, depending on the selection of the composition of the surface layer and the intermediate layer, the selection of the layer thickness ratio, and the like.
  • the double-sided adhesive sheet of Comparative Example 1 was inferior in reworkability because the ratio of the tensile storage elastic modulus (E') to the shear storage elastic modulus (G') was 4.9.
  • the (meth) acrylic pressure-sensitive adhesive layer is a single layer, and the loss tangent (Tan ⁇ ) obtained by dynamic viscoelasticity measurement in the shear mode at a frequency of 1 Hz. Since the peak temperature (T1) of is higher than -10 ° C or the adhesive strength is 5.0 N / 20 mm or less, the double-sided adhesive sheet is hard and inferior in step absorption, or the edge of the bonded surface in the reliability test. The bonding reliability was inferior due to the generation of air bubbles in the part.
  • the double-sided adhesive sheet of Comparative Example 4 is inferior in reworkability because the peak temperature (T2) of the loss tangent (Tan ⁇ ) obtained by the dynamic viscoelasticity measurement in the tension mode at a frequency of 1 Hz is lower than -10 ° C. Met.
  • the double-sided adhesive sheet of the present invention is excellent in adhesive performance such as step absorption, adhesive strength, and bonding reliability, and the constituent members for an image display device can be easily peeled off (separated) by a cooling operation. Therefore, it can be suitably used for bonding constituent members for an image display device. Then, the laminated body for the image display device and the image display device of the present invention can be easily peeled (separated) from the constituent members for the image display device, and are excellent in reworkability.

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

Abstract

La présente invention, en tant que feuille adhésive double face destinée à être utilisée dans la liaison de deux éléments structurels pour un dispositif d'affichage d'image, la feuille adhésive double face ayant une performance adhésive exceptionnelle telle qu'une absorption de pas, une résistance adhésive et une fiabilité de liaison, et permettant aux éléments structurels d'un dispositif d'affichage d'image d'être détachés par une opération de refroidissement, concerne une feuille adhésive double face dans laquelle le rapport (E'/G') du module de conservation en traction (E') et du module de conservation en cisaillement (G') est de 5,0 ou plus, la température de pic (T1) de la tangente de perte (Tanδ) obtenue par mesure de viscoélasticité dynamique en mode de cisaillement à une fréquence de 1 Hz est -10 °C ou moins, la température de pic (T2) de la tangente de perte (Tanδ) obtenue par mesure de viscoélasticité dynamique en mode de traction à une fréquence de 1 Hz est -10 °C ou plus (où, lorsque deux températures de pic ou plus sont observées, la température plus élevée est prise comme étant la température de pic (T2)), et la résistance adhésive au pelage à 180° des surfaces de support des deux éléments structurels du dispositif d'affichage d'image à 23 °C est de 5 N/20 mm ou plus.
PCT/JP2021/006553 2020-03-31 2021-02-22 Feuille adhésive double face, stratifié pour dispositif d'affichage d'image, et dispositif d'affichage d'image WO2021199787A1 (fr)

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CN202180010580.0A CN115210332A (zh) 2020-03-31 2021-02-22 双面粘合片、图像显示装置用层叠体和图像显示装置
JP2021510261A JPWO2021199787A1 (fr) 2020-03-31 2021-02-22
KR1020227025563A KR20220156518A (ko) 2020-03-31 2021-02-22 양면 점착 시트, 화상 표시 장치용 적층체 및 화상 표시 장치

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WO2012032995A1 (fr) * 2010-09-06 2012-03-15 三菱樹脂株式会社 Procédé de fabrication d'un laminé pour la configuration d'un dispositif d'affichage d'image, et dispositif d'affichage d'image utilisant le laminé
WO2015005266A1 (fr) * 2013-07-09 2015-01-15 ニチバン株式会社 Composition d'agent adhésif et feuille d'agent adhésif
JP2018048317A (ja) * 2016-09-15 2018-03-29 三菱ケミカル株式会社 粘着シート積層体、賦形粘着シート積層体及びその製造方法
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JP4493273B2 (ja) 2003-01-29 2010-06-30 日東電工株式会社 両面粘着シートおよびタッチパネル付き表示装置
JP2015157884A (ja) * 2014-02-21 2015-09-03 三菱樹脂株式会社 透明両面粘着シート及び画像表示装置
JP2016104829A (ja) * 2014-12-01 2016-06-09 大日本印刷株式会社 粘着シート、その貼り合わせ方法、その製造方法、貼合体及び画像表示装置
JP6525726B2 (ja) * 2015-05-21 2019-06-05 リンテック株式会社 粘着シートおよび表示体
JP6714921B2 (ja) * 2016-07-01 2020-07-01 東亞合成株式会社 粘着剤組成物及びその用途

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JP2005263917A (ja) * 2004-03-17 2005-09-29 Nitto Denko Corp アクリル系粘着剤組成物および粘着テープ
WO2010137523A1 (fr) * 2009-05-26 2010-12-02 三菱樹脂株式会社 Matériau adhésif redécollable
WO2012032995A1 (fr) * 2010-09-06 2012-03-15 三菱樹脂株式会社 Procédé de fabrication d'un laminé pour la configuration d'un dispositif d'affichage d'image, et dispositif d'affichage d'image utilisant le laminé
WO2015005266A1 (fr) * 2013-07-09 2015-01-15 ニチバン株式会社 Composition d'agent adhésif et feuille d'agent adhésif
JP2018048317A (ja) * 2016-09-15 2018-03-29 三菱ケミカル株式会社 粘着シート積層体、賦形粘着シート積層体及びその製造方法
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JP2019119845A (ja) * 2017-12-28 2019-07-22 日東電工株式会社 樹脂組成物、樹脂層、および積層シート

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