WO2021106997A1 - Ruban autoadhésif double face - Google Patents

Ruban autoadhésif double face Download PDF

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Publication number
WO2021106997A1
WO2021106997A1 PCT/JP2020/043990 JP2020043990W WO2021106997A1 WO 2021106997 A1 WO2021106997 A1 WO 2021106997A1 JP 2020043990 W JP2020043990 W JP 2020043990W WO 2021106997 A1 WO2021106997 A1 WO 2021106997A1
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Prior art keywords
double
adhesive tape
base material
weight
sided adhesive
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PCT/JP2020/043990
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English (en)
Japanese (ja)
Inventor
友也 川本
智 土居
桃子 原田
由紀菜 松井
博亮 前川
Original Assignee
積水化学工業株式会社
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Application filed by 積水化学工業株式会社 filed Critical 積水化学工業株式会社
Priority to CN202080039952.8A priority Critical patent/CN113924350A/zh
Priority to JP2020571861A priority patent/JPWO2021106997A1/ja
Priority to KR1020217031356A priority patent/KR20220104105A/ko
Publication of WO2021106997A1 publication Critical patent/WO2021106997A1/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
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/22—Plastics; Metallised plastics
    • C09J7/26—Porous or cellular plastics
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different 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
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed 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
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/022—Mechanical properties
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/30—Low-molecular-weight compounds
    • C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
    • C08G18/3203—Polyhydroxy compounds
    • C08G18/3206—Polyhydroxy compounds aliphatic
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/30—Low-molecular-weight compounds
    • C08G18/34—Carboxylic acids; Esters thereof with monohydroxyl compounds
    • C08G18/348—Hydroxycarboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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    • C08G18/4825—Polyethers containing two hydroxy groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
    • C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
    • C08G18/6666—Compounds of group C08G18/48 or C08G18/52
    • C08G18/667—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38
    • C08G18/6674—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3203
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
    • C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
    • C08G18/6666—Compounds of group C08G18/48 or C08G18/52
    • C08G18/6692—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/34
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/72—Polyisocyanates or polyisothiocyanates
    • C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
    • C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
    • C08G18/7657—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings
    • C08G18/7664—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups
    • C08G18/7671—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups containing only one alkylene bisphenyl group
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
    • C08J9/122—Hydrogen, oxygen, CO2, nitrogen or noble gases
    • 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
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C09J133/04—Homopolymers or copolymers of esters
    • C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C09J133/04—Homopolymers or copolymers of esters
    • C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C09J133/062—Copolymers with monomers not covered by C09J133/06
    • C09J133/066—Copolymers with monomers not covered by C09J133/06 containing -OH groups
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/22—Plastics; Metallised plastics
    • C09J7/25—Plastics; Metallised plastics based on macromolecular compounds obtained otherwise than by reactions involving only carbon-to-carbon unsaturated bonds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/29—Laminated material
    • 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
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • C09J7/385—Acrylic polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
    • C08J2375/04—Polyurethanes
    • C08J2375/08—Polyurethanes from polyethers
    • 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
    • C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
    • C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature
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    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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    • C09J2433/00—Presence of (meth)acrylic polymer
    • C09J2433/006—Presence of (meth)acrylic polymer in the substrate
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    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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    • C09J2467/00—Presence of polyester
    • C09J2467/006—Presence of polyester in the substrate
    • 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
    • C09J2475/00—Presence of polyurethane
    • C09J2475/006—Presence of polyurethane in the substrate

Definitions

  • the present invention relates to a double-sided adhesive tape.
  • Adhesive tapes are widely used for fixing electronic components. Specifically, for example, in a display device such as a television or a monitor, an adhesive tape is used to fix a cover panel on the surface to a housing. Such an adhesive tape is used, for example, in the shape of a frame or the like so as to be arranged around the display screen.
  • Patent Documents 1 and 2 have an acrylic pressure-sensitive adhesive layer laminated and integrated on at least one surface of a base material layer, and the base material layer is specific.
  • a shock absorbing tape which is a crosslinked polyolefin resin foam sheet having a degree of crosslinking and an aspect ratio of air bubbles is described.
  • the present invention provides a double-sided adhesive tape which is excellent in drop impact resistance, can reduce display unevenness of a display device, and can easily tear a foam base material when peeled from an adherend. With the goal.
  • the present invention is a double-sided adhesive tape having a foam base material and pressure-sensitive adhesive layers laminated on both sides of the foam base material, and the foam base material has a bubble volume fraction of 40% by volume or more. and 75% by volume or less, the shear breaking strength of a double-sided pressure-sensitive adhesive tape is 200 N / inch 2 or more 500 N / inch 2 or less.
  • the present invention will be described in detail below.
  • the present inventors have an X-ray CT (X-ray Computed Tomography) apparatus in a double-sided adhesive tape having a foam base material and adhesive layers laminated on both sides of the foam base material.
  • the bubble structure of the foam base material was analyzed using image analysis software, and the effect of the bubble structure on the performance of the double-sided adhesive tape was examined.
  • the present inventors adjust the volume fraction of the foam base material to a specific range, and further adjust the shear breaking strength of the foam base material to a specific range to obtain the strength of the foam base material. And found that both can be increased in flexibility.
  • the foam base material has a lower limit of 40% by volume and an upper limit of 75% by volume of the bubble volume fraction.
  • both the strength and flexibility of the foam base material can be increased, and at the same time, both can be achieved.
  • the bubble volume fraction is 40% by volume or more
  • the foam base material can have appropriate flexibility, so that display unevenness of the display device can be reduced, and the double-sided adhesive tape is adhered.
  • the foam base material can be easily torn when peeled from.
  • the bubble volume fraction is 75% by volume or less, it is possible to prevent the strength of the foam base material from being excessively lowered, so that the drop impact resistance of the double-sided adhesive tape can be improved.
  • the preferable lower limit of the bubble volume fraction is 42% by volume, the preferable upper limit is 70% by volume, the more preferable lower limit is 46% by volume, the more preferable upper limit is 67% by volume, the further preferable lower limit is 48% by volume, and further preferable.
  • the upper limit is 63% by volume, a particularly preferable lower limit is 50% by volume, and a particularly preferable upper limit is 60% by volume.
  • the bubble volume fraction is calculated by the following formula (1) using an X-ray CT apparatus and image analysis software.
  • Bubble volume fraction (volume%) bubble volume / volume of foam base material x 100 (1)
  • the bubble volume is the total volume of all bubbles contained in the foam base material of the sample to be measured.
  • the average and standard deviation of the major axis distribution of the bubbles of the foam base material are not particularly limited, but the preferable upper limit of the average of the major axis distribution of the bubbles is 55 ⁇ m, and the preferable upper limit of the standard deviation of the major axis distribution of the bubbles is 30 ⁇ m.
  • the drop impact resistance of the double-sided adhesive tape can be improved, the display unevenness of the display device can be reduced, and the foam base material can be easily pulled when the double-sided adhesive tape is peeled off from the adherend. Can be torn.
  • the bubbles are too large or the size of the bubbles varies, there are locally particularly low strength points in the foam base material, especially when the double-sided adhesive tape is used in a thin and narrow width. As a result, an impact is applied due to dropping or the like during transportation, so that the above-mentioned location is the starting point for interlayer destruction of the foam base material or peeling of the double-sided adhesive tape.
  • a more preferable upper limit of the average of the major axis distribution is 53 ⁇ m, a further preferable upper limit is 51 ⁇ m, and a further preferable upper limit is 49 ⁇ m.
  • the lower limit of the average of the major axis distribution is not particularly limited, and is determined depending on the bubble volume fraction and the thickness of the foam base material, but the practical lower limit is 10 ⁇ m.
  • a more preferred upper limit of the standard deviation of the major axis distribution is 28 ⁇ m, a further preferred upper limit is 27 ⁇ m, and a further preferred upper limit is 24 ⁇ m.
  • the foaming ratio of the bubbles in the foam base material is not particularly limited, but when the foam base material is a polyurethane foam, the preferable upper limit of the foaming ratio of the bubbles is 95% by volume.
  • the polyurethane foam has a continuous foam structure, and the continuous foam ratio is close to 100% by volume. Therefore, when the foam base material is a polyurethane foam, having a continuous foam ratio in the above range means that the continuous foam ratio is relatively low and the number of closed cells is large among the polyurethane foams. By adjusting the continuous foam ratio within the above range and increasing the number of closed cells, the strength and flexibility of the polyurethane foam can be further increased.
  • a more preferable upper limit of the continuous foam ratio is 93% by volume, and a more preferable upper limit is 91% by volume.
  • the lower limit of the continuous foaming ratio is not particularly limited, but the general lower limit of the continuous foaming ratio of the polyurethane foam is 90% by volume.
  • the continuous bubble ratio of bubbles is calculated by the following formula (2) using an X-ray CT apparatus and image analysis software.
  • Communication bubble ratio (volume%) communication bubble volume / bubble volume x 100 (2)
  • the communicating bubble volume is the total volume of all the communicating bubbles contained in the foam base material of the sample to be measured, and the bubble volume is included in the foam base material of the sample to be measured. It is the sum of the volumes of all the bubbles.
  • the more preferable upper limit of the flatness is 0.18, the further preferable upper limit is 0.16, and the even more preferable upper limit is 0.14.
  • the lower limit of the flatness is not particularly limited, and the closer it is to 0, the closer the bubbles are to a true sphere, and the more uniform the impact relaxation against dropping from all angles is preferable. Therefore, the practical lower limit is 0.05.
  • the aspect ratio of the bubbles in the foam base material is not particularly limited, but the preferable upper limit is 1.5. By adjusting the aspect ratio to the above range, the impact mitigation against dropping from any angle can be made more uniform, and the drop impact resistance of the double-sided adhesive tape can be improved.
  • a more preferable upper limit of the aspect ratio is 1.1, a further preferable upper limit is 1.09, and a further preferable upper limit is 1.07.
  • the lower limit of the aspect ratio is not particularly limited, and the closer it is to 1, the closer the bubbles are to a perfect circle, and the more uniform the impact relaxation against dropping from all angles is preferable. Therefore, the practical lower limit is 1.01.
  • the aspect ratio and flatness of the bubbles are calculated by the following equations (3) and (4) using an X-ray CT apparatus and image analysis software.
  • the X-ray CT apparatus and the image analysis software are not particularly limited, but the analysis using the X-ray CT apparatus and the image analysis software is performed in more detail, for example, as follows.
  • the central part of the measurement sample obtained by cutting the foam substrate was imaged with an X-ray CT device (for example, "TDM1000H-II (2K)" manufactured by Yamato Scientific Co., Ltd., resolution of about 1.5 ⁇ m / pixel).
  • An X-ray CT device for example, "TDM1000H-II (2K)" manufactured by Yamato Scientific Co., Ltd., resolution of about 1.5 ⁇ m / pixel.
  • a rectangular parallelepiped 3D image having a length of 1.5 mm, a width of 1.2 mm, and a height of 0.3 mm is obtained.
  • the obtained image is noise-removed and binarized by image analysis software (for example, "Avizo 9.2.0" manufactured by FEI), and each numerical value (foam volume fraction) representing the bubble structure of the foam base material is used. , Average and standard deviation of the major axis distribution of bubbles, continuous bubble rate of bubbles, aspect ratio of bubbles, flatness of bubbles, etc.).
  • image analysis software for example, "Avizo 9.2.0" manufactured by FEI
  • each numerical value (foam volume fraction) representing the bubble structure of the foam base material is used. , Average and standard deviation of the major axis distribution of bubbles, continuous bubble rate of bubbles, aspect ratio of bubbles, flatness of bubbles, etc.).
  • Mo is used
  • a lens L0270
  • noise is first removed by the Median Filter (Neighborhood value 26) function.
  • the threshold value is 90 out of 256 gradations.
  • whether the bubble is a closed bubble or a continuous bubble is determined by the presence or absence of a break in the continuous portion of the pixel.
  • the bubbles are first divided by contacts to obtain the center of gravity of the bubbles.
  • a rectangular parallelepiped having the center of gravity at the same position as the center of gravity and inscribed in the bubble is set, and the lengths of the three orthogonal sides are set to the major axis, the medium diameter, and the minor axis, respectively, from the longest.
  • bubbles having a major axis of less than 10 ⁇ m are excluded.
  • each numerical value representing the bubble structure of the foam base material (volume fraction of bubbles, average and standard deviation of major axis distribution of bubbles, continuous bubble rate of bubbles, aspect ratio of bubbles, flatness of bubbles, etc.) within the above range.
  • the method of doing so is not particularly limited.
  • the foam base material is a polyurethane foam
  • the type and content of polyisocyanate and polyol in the urethane resin composition the conditions for mixing air, nitrogen, etc. with the urethane resin composition, and the urethane resin composition.
  • the reaction conditions and the like when the urethane is heat-cured may be adjusted.
  • the bubble volume fraction can be adjusted by changing the type and content of polyisocyanate and polyol in the urethane resin composition, and the foaming conditions. Even when the raw materials are the same, it can be adjusted by changing the conditions for mixing air, nitrogen, etc. with the urethane resin composition, the reaction conditions for heating and curing the urethane resin composition, and the like. Further, the average and standard deviation of the major axis distribution of the bubbles can be reduced by adjusting by slowly advancing the urethanization reaction.
  • the foam base material may have a single-layer structure or a multi-layer structure.
  • the foam base material is not particularly limited, and examples thereof include polyurethane foams, polyolefin foams, and acrylic foams. Of these, polyurethane foam is preferable because it has appropriate flexibility and the bubble structure can be easily adjusted.
  • polyurethane foam examples include a polyurethane foam made of a urethane resin composition containing a polyisocyanate and a polyol. Such a polyurethane foam can be produced by heat-curing the urethane resin composition.
  • the polyisocyanate is not particularly limited, and examples thereof include aromatic polyisocyanates and aliphatic polyisocyanates used for general polyurethane foams. Of these, aromatic diisocyanates or aliphatic diisocyanates having two isocyanate groups in one molecule are preferable.
  • 4,4'-diphenylmethane diisocyanate is also generally referred to as "MDI" or "binuclear monomeric MDI". Of these, 4,4'-diphenylmethane diisocyanate (MDI) is preferable because a polyurethane foam having excellent flexibility can be easily obtained.
  • aromatic diisocyanates or aliphatic diisocyanates may be used alone or in combination of two or more.
  • the above-mentioned polyol is not particularly limited, and examples thereof include polyols used for general polyurethane foams. Specific examples thereof include polyether polyols, polyester polyols, and polyether ester polyols. Further, examples of the above-mentioned polyol include trifunctional polyether polyol, glycerin, trimethylolpropane and the like. These polyols may be used alone or in combination of two or more.
  • the above-mentioned polyether polyol is not particularly limited, and examples thereof include polypropylene glycol (PPG) and the like.
  • the polyester polyol is not particularly limited, and a polyester polyol composed of a polyol component and an acid component can be used.
  • the polyol preferably contains a short chain diol.
  • the strength of the polyurethane foam is increased. Therefore, in order to generate bubbles having a more uniform size and adjust the bubble structure, for example, the urethanization reaction is slowed down by increasing the content of the polyisocyanate in the urethane resin composition to increase the fluidity of the resin. Even in the case of proceeding to the above, it is possible to prevent the polyurethane foam from being excessively lowered in strength.
  • Examples of the short chain diol include 1,5-pentanediol, 1,6-hexamethylene diol, neopentyl glycol, ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, 1,4-butanediol, neopentyl glycol and the like. Can be mentioned. These short chain diols may be used alone or in combination of two or more. Of these, 1,5-pentanediol or 1,6-hexamethylenediol is preferable because a high-strength polyurethane foam can be easily obtained. In addition, neopentyl glycol is preferable because it is easy to lower the continuous foam ratio.
  • the weight average molecular weight of the polyol is not particularly limited, but the preferred lower limit is 500 and the preferred upper limit is 5000.
  • the weight average molecular weight of the polyol is 500 or more, the polyurethane foam can have appropriate flexibility.
  • the weight average molecular weight of the polyol is 5000 or less, it is possible to prevent the strength of the polyurethane foam from being excessively lowered.
  • the more preferable lower limit of the weight average molecular weight of the polyol is 700, the more preferable upper limit is 2000, the more preferable lower limit is 800, and the further preferable upper limit is 1500.
  • a GPC apparatus for example, manufactured by Tosoh Corporation, product name "HLC-8220", column: TSKgelSuper HZM-N (4 pieces)
  • HLC-8220 column: TSKgelSuper HZM-N (4 pieces)
  • a flow rate of 0.5 mL / min can be adopted as the measurement conditions.
  • the isocyanate index of the polyisocyanate in the urethane resin composition is not particularly limited, but a preferable lower limit is 70 and a preferable upper limit is 120.
  • the isocyanate index is an index relating to the isocyanate equivalent in the reaction between isocyanate and an active hydrogen-containing compound.
  • the isocyanate index is less than 100, it means that the reactive group such as a hydroxyl group is more than the isocyanate group, and when the isocyanate index is more than 100, it means that the isocyanate group is more than the reactive group such as the hydroxyl group.
  • the isocyanate index is 70 or more, the cross-linking with the polyisocyanate is sufficient and the bubble structure can be easily adjusted.
  • the polyurethane foam can have an appropriate density, and the strength and flexibility are increased. ..
  • the isocyanate index is 120 or less, the degree of cross-linking of the polyurethane foam does not increase too much, and the glass transition point (Tg) becomes relatively low, so that the foam becomes easily stretchable and has high strength and flexibility. ..
  • the content of the polyisocyanate in the urethane resin composition is not particularly limited, but the urethanization reaction is slowly promoted by, for example, increasing the content of the polyisocyanate in the urethane resin composition to increase the fluidity of the resin. Therefore, it is preferable to adjust the bubble structure by generating bubbles having a more uniform size.
  • the preferable lower limit is 5% by weight and the preferable upper limit is 30% by weight with respect to 100% by weight of the polyol.
  • the urethanization reaction can be slowly promoted to generate bubbles having a more uniform size, so that the bubble structure can be easily adjusted and the polyurethane foam can be easily adjusted.
  • the content of the polyisocyanate is 30% by weight or less, the degree of cross-linking of the polyurethane foam does not increase too much and the glass transition point (Tg) becomes relatively low, so that the foam becomes stretchable and has strength and flexibility.
  • Tg glass transition point
  • the sex becomes high.
  • the more preferable lower limit of the content of the polyisocyanate is 15% by weight, and the more preferable upper limit is 25% by weight.
  • the urethane resin composition may contain a catalyst, if necessary.
  • the catalyst include organic tin compounds, organic zinc compounds, organic nickel compounds, organic iron compounds, metal catalysts, tertiary amine-based catalysts, and organic acid salts. Of these, organic tin compounds are preferable. These catalysts may be used alone or in combination of two or more.
  • the amount of the catalyst added is not particularly limited, but the preferable lower limit is 0.05 parts by weight, the preferable upper limit is 5.0 parts by weight, and the more preferable upper limit is 4.0 parts by weight with respect to 100 parts by weight of the polyol.
  • Examples of the organic tin compound include stanas octoate, dibutyltin diacetate, dibutyltin dilaurate and the like.
  • Examples of the organic zinc compound include zinc octylate and the like.
  • Examples of the organic nickel compound include nickel acetylacetone and nickel diacetylacetone.
  • Examples of the organic iron compound include iron acetylacetone.
  • Examples of the metal catalyst include alkoxides and phenoxides of alkali metals such as sodium acetate or alkaline earth metals.
  • tertiary amine-based catalyst examples include triethylamine, triethylenediamine, N-methylmorpholine dimethylaminomethylphenol, imidazole, 1,8-diazabicyclo [5.4.0] undecene and the like.
  • the urethane resin composition may contain a foaming agent, if necessary.
  • the foaming agent include foaming agents used for general polyurethane foams. Specific examples thereof include water, pentane, cyclopentane, hexane, cyclohexane, dichloromethane, carbon dioxide and the like.
  • the amount of the foaming agent added is not particularly limited and may be an appropriate amount, but when the foaming agent is water, it is usually about 0.1 to 3 parts by weight with respect to 100 parts by weight of the polyol. is there.
  • the urethane resin composition may contain a defoaming agent, if necessary.
  • the defoaming agent include silicone-based defoaming agents such as dimethylsiloxane, polyetherdimethylsiloxane, and phenylmethylsiloxane. Of these, polyetherdimethylsiloxane is preferable. Among the polyether dimethylsiloxanes, block copolymers of dimethylpolysiloxane and polyether are more preferable. These foam stabilizers may be used alone or in combination of two or more.
  • the amount of the foam stabilizer added is not particularly limited, but the preferable lower limit with respect to 100 parts by weight of the polyol is 0.2 parts by weight, the preferable upper limit is 7 parts by weight, the more preferable lower limit is 0.4 parts by weight, and the more preferable upper limit. Is 5 parts by weight.
  • the urethane resin composition may contain additives generally used in the production of polyurethane foams such as ultraviolet absorbers, antioxidants, organic fillers, inorganic fillers, and colorants. Good.
  • a method for producing the polyurethane foam for example, a urethane resin composition (liquid) obtained by mechanically mixing air, nitrogen, etc. and foaming is applied to the surface of a release liner or a resin film, and the applied urethane resin composition is applied.
  • a method of producing a foam by heat-curing the resin mechanical floss method and the like can be mentioned.
  • a method of reacting the polyisocyanate with the raw material for forming the polyurethane foam to generate a gas (chemical foaming method) and the like can be mentioned.
  • the mechanical floss method is preferable.
  • the polyurethane foam obtained by the mechanical floss method tends to have a higher density than the polyurethane foam obtained by the chemical foam method, and the bubble structure tends to be fine and uniform.
  • polyolefin foam examples include a foam made of a resin such as a polyethylene resin, a polypropylene resin, and a polybutadiene resin. Of these, polyethylene-based resins are preferable because flexible polyolefin foams can be easily obtained.
  • the foam substrate has a lower limit of shear breaking strength of 200 N / inch 2 and an upper limit of 500 N / inch 2 .
  • the shear breaking strength is 200 N / inch 2 or more, the strength of the foam base material is sufficiently high, and the drop impact resistance of the double-sided adhesive tape is improved.
  • the shear breaking strength is 500 N / inch 2 or less, it is possible to suppress the flexibility of the foam base material from being excessively lowered, so that display unevenness of the display device can be reduced, and the double-sided adhesive tape can be used.
  • the foam base material can be easily torn when the material is peeled off from the adherend.
  • the preferred lower limit of the shear breaking strength 220 N / inch 2 a preferred upper limit is 470N / inch 2, and more preferable lower limit is 240 N / inch 2, and more preferred upper limit is 450 N / inch 2, still more preferred lower limit 270N / inch 2.
  • a more preferable upper limit is 415 N / inch 2 .
  • FIG. 1 shows a schematic diagram showing a method for measuring shear breaking strength.
  • a test piece 18 having a size of 25 mm ⁇ 25 mm and two SUS plates 19 having a size of 125 mm ⁇ 50 mm and a thickness of 2 mm of double-sided adhesive tape are laminated as shown in FIG.
  • This laminate is crimped with a weight under the conditions of 5 kg and 10 seconds, and then allowed to stand for 24 hours to prepare a test sample in which two SUS plates 19 are bonded via a test piece 18.
  • the upper one of the other SUS plates 19 is placed in the direction perpendicular to the stacking direction of the SUS plates (in the figure, the arrow direction). It is pulled under the condition of 7 mm / min, and the force (breaking point strength) applied to the test piece 18 when the test piece 18 breaks is measured.
  • the test piece 18 breaks it means that the foam base material breaks between layers.
  • the shear breaking strength of the foam base material can be adjusted by changing the type and content of the polyisocyanate and the polyol in the urethane resin composition. Even when the raw materials are the same, it can be adjusted by setting the volume fraction of bubbles, the average of the major axis distribution of bubbles, the standard deviation, and the like within appropriate ranges.
  • the 25% compressive strength of the foam base material is not particularly limited, but the preferable lower limit is 0.015 MPa and the preferable upper limit is 0.08 MPa.
  • the 25% compression strength is 0.015 MPa or more, the strength of the foam base material is sufficiently high, and the drop impact resistance of the double-sided adhesive tape is improved.
  • the 25% compression strength is 0.08 MPa or less, it is possible to prevent the flexibility of the foam base material from being excessively lowered, so that the double-sided adhesive tape can be satisfactorily crimped, and the display device can be used. Display unevenness can be reduced, and the foam base material can be easily torn when the double-sided adhesive tape is peeled off from the adherend.
  • the more preferable lower limit of the 25% compression strength is 0.02 MPa, the more preferable upper limit is 0.07 MPa, the further preferable lower limit is 0.025 MPa, the further preferable upper limit is 0.065 MPa, and the further preferable lower limit is 0.03 MPa.
  • An even more preferable upper limit is 0.06 MPa.
  • the 25% compression strength can be determined by measuring in accordance with JIS K 6254: 2010.
  • the 25% compressive strength of the foam base material can be adjusted by changing the type and content of the polyisocyanate and the polyol in the urethane resin composition. Even when the raw materials are the same, it can be adjusted by setting the volume fraction of bubbles, the average of the major axis distribution of bubbles, the standard deviation, and the like within appropriate ranges.
  • the glass transition point of the foam base material is not particularly limited, but a preferable lower limit is ⁇ 30 ° C. and a preferable upper limit is 30 ° C.
  • a preferable lower limit is ⁇ 30 ° C. or higher
  • the foam base material exhibits good low resilience and can relieve stress.
  • the foam base material can have appropriate flexibility, and the foam becomes an easily stretchable foam, and the strength and flexibility are increased. ..
  • the more preferable lower limit of the glass transition point of the foam base material is ⁇ 25 ° C., and the more preferable upper limit is 20 ° C.
  • the double-sided adhesive tape of the present invention may further have a resin sheet on at least one side of the foam base material.
  • the resin sheet may be laminated on one side of the foam base material, or may be laminated on both sides.
  • the resin constituting the resin sheet is not particularly limited, and for example, polyester resin such as polyethylene terephthalate, acrylic resin, polyethylene resin, polypropylene resin, polyvinyl chloride, epoxy resin, silicone resin, phenol resin, polyimide, etc. Examples include polyester and polypropylene. Of these, acrylic resins, polyethylene resins, polypropylene resins, and polyester resins are preferable because of their excellent flexibility. Among the polyester-based resins, polyethylene terephthalate is preferable.
  • the resin constituting the resin sheet may be a thermoplastic resin.
  • the thermoplastic resin is not particularly limited, and for example, a styrene-based (co) polymer, an olefin-based (co) polymer, a vinyl chloride-based (co) polymer, a polyether ester-based triblock-based (co) polymer, and the like. Examples thereof include polyester-based (co) polymers, urethane-based (co) polymers, amide-based (co) polymers, and acrylic (co) polymers.
  • the resin sheet When the resin constituting the resin sheet is a thermoplastic resin, the resin sheet preferably has a tensile elastic modulus of 200 MPa or less.
  • a tensile elastic modulus of 200 MPa or less By using a flexible resin having a tensile elastic modulus of 200 MPa or less, the flexibility of the entire double-sided adhesive tape is ensured, the double-sided adhesive tape can be easily wound into a roll, and the handleability is remarkably improved.
  • the tensile elastic modulus can be measured by a method according to JIS K 7161. Specifically, for example, a resin sheet is punched into a dumbbell shape using a punching blade "Tension No. 1 type dumbbell shape" manufactured by Polymer Instruments Co., Ltd. to prepare a test piece.
  • the tensile elastic modulus of the obtained test piece is measured at a tensile speed of 100 mm / min using, for example, "Autograph AGS-X” manufactured by Shimadzu Corporation.
  • the tensile elastic modulus is calculated from the slope of the tensile strength between the strains of 1 to 3%.
  • the resin constituting at least one of the resin sheets is preferably a thermoplastic resin. That is, the double-sided adhesive tape of the present invention preferably has a resin sheet made of a thermoplastic resin.
  • the double-sided adhesive tape of the present invention comprises a first resin sheet laminated on the first surface of the foam base material and a second resin sheet laminated on the second surface of the foam base material. At least one selected from the group consisting of the first resin sheet and the second resin sheet is preferably a resin sheet composed of a thermoplastic resin.
  • the thickness of the resin sheet is not particularly limited, but the preferable lower limit is 10 ⁇ m and the preferable upper limit is 100 ⁇ m. If the thickness of the resin sheet is 10 ⁇ m or more, the resin sheet is less likely to break even when the resin sheet is pulled. When the thickness of the resin sheet is 100 ⁇ m or less, it is possible to suppress a decrease in followability to the adherend.
  • a more preferable lower limit of the thickness of the resin sheet is 15 ⁇ m, a more preferable upper limit is 80 ⁇ m, a further preferable lower limit is 20 ⁇ m, a further preferable upper limit is 60 ⁇ m, a further preferable lower limit is 25 ⁇ m, and a further preferable upper limit is 50 ⁇ m.
  • the resin sheet may be colored.
  • coloring the resin sheet it is possible to impart light-shielding properties to the double-sided adhesive tape.
  • the method of coloring the resin sheet is not particularly limited, and for example, a method of kneading particles such as carbon black or titanium oxide or fine bubbles into the resin constituting the resin sheet, or applying ink to the surface of the resin sheet. The method and the like can be mentioned.
  • the pressure-sensitive adhesive layers laminated on both sides of the foam base material may have the same composition or different compositions.
  • the pressure-sensitive adhesive layer is not particularly limited, and examples thereof include a pressure-sensitive adhesive layer made of an acrylic pressure-sensitive adhesive, a rubber-based pressure-sensitive adhesive, a urethane pressure-sensitive adhesive, a silicone-based pressure-sensitive adhesive, and the like.
  • acrylic containing an acrylic copolymer and a tackifier because the adhesive strength can be easily adjusted, it is relatively stable against light, heat, moisture, etc., and it can be applied to various adherends.
  • It is preferably a pressure-sensitive adhesive layer made of a pressure-sensitive adhesive.
  • the acrylic copolymer is obtained by copolymerizing a monomer mixture.
  • the monomer mixture may be subjected to a radical reaction in the presence of a polymerization initiator.
  • a method of radically reacting the monomer mixture that is, a polymerization method
  • examples thereof include solution polymerization (boiling point polymerization or constant temperature polymerization), emulsion polymerization, suspension polymerization, and bulk polymerization.
  • the reaction method for radically reacting the monomer mixture include living radical polymerization and free radical polymerization.
  • the ratio of the weight average molecular weight (Mw) to the number average molecular weight (Mn) of the acrylic copolymer is not particularly limited, but the preferable lower limit is 1.05 and the preferable upper limit is 5.0. ..
  • Mw / Mn molecular weight distribution
  • the more preferable upper limit of the molecular weight distribution (Mw / Mn) is 3.0, the more preferable upper limit is 2.5, and the particularly preferable upper limit is 2.3.
  • the polymerization conditions such as the polymerization initiator and the polymerization temperature may be adjusted.
  • the number average molecular weight (Mn) and the weight average molecular weight (Mw) are standard polystyrene-equivalent molecular weights obtained by GPC (Gel Permeation Chromatography: Gel Permeation Chromatography). In GPC, for example, 2690 Separations Model (manufactured by Waters) or the like can be used.
  • a GPC apparatus for example, manufactured by Tosoh Corporation, product name "HLC-8220", column: TSKgelSuper HZM-N (4 pieces)
  • tetrahydrofuran can be used as a solvent
  • a measurement condition for example, 40 ° C. and a flow rate of 0.5 mL / min can be adopted.
  • the acrylic copolymer When the molecular weight distribution (Mw / Mn) of the acrylic copolymer is 2.5 or less, the acrylic copolymer preferably contains a structural unit derived from 2-ethylhexyl acrylate. When the molecular weight distribution (Mw / Mn) of the acrylic copolymer is 2.5 or less, the content of the structural unit derived from the 2-ethylhexyl acrylate is not particularly limited, but the preferable lower limit is 80% by weight and the preferable upper limit. Is 98% by weight.
  • the content of the structural unit is 80% by weight or more, the glass transition point of the acrylic copolymer is lowered, the wettability of the pressure-sensitive adhesive layer to the adherend is high, and the drop impact resistance of the double-sided adhesive tape is high. Is improved.
  • the content of the structural unit is 98% by weight or less, the cohesive force of the pressure-sensitive adhesive layer is increased, and the drop impact resistance of the double-sided pressure-sensitive adhesive tape is improved.
  • a more preferable lower limit of the content of the structural unit is 90% by weight, and a more preferable upper limit is 97% by weight.
  • the acrylic copolymer is a structural unit derived from a (meth) acrylic acid alkyl ester having an alkyl group having 4 or less carbon atoms. Is preferably contained.
  • the (meth) acrylic acid alkyl ester having an alkyl group having 4 or less carbon atoms is not particularly limited.
  • Examples of the (meth) acrylic acid alkyl ester having an alkyl group having 4 or less carbon atoms include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, and n-. Butyl (meth) acrylate and the like can be mentioned. Of these, ethyl (meth) acrylate and n-butyl (meth) acrylate are preferable, and these acrylates are more preferable.
  • These (meth) acrylic acid alkyl esters having an alkyl group having 4 or less carbon atoms may be used alone or in combination of two or more.
  • the content of the structural unit derived from the (meth) acrylic acid alkyl ester having an alkyl group having 4 or less carbon atoms is particularly limited.
  • the preferred lower limit is 40% by weight and the preferred upper limit is 80% by weight.
  • the content of the structural unit is 40% by weight or more, the cohesive force of the pressure-sensitive adhesive layer is increased, and the drop impact resistance of the double-sided pressure-sensitive adhesive tape is improved.
  • the content of the structural unit is 80% by weight or less, it is possible to suppress the wettability of the pressure-sensitive adhesive layer from being excessively lowered to the adherend, and the drop impact resistance of the double-sided pressure-sensitive adhesive tape is improved.
  • the acrylic copolymer When the molecular weight distribution (Mw / Mn) of the acrylic copolymer is 2.5 or more, the acrylic copolymer preferably contains a structural unit derived from 2-ethylhexyl acrylate.
  • the content of the structural unit derived from the 2-ethylhexyl acrylate is not particularly limited, but the preferable lower limit is 10% by weight and the preferable upper limit. Is 40% by weight.
  • the content of the structural unit is 10% by weight or more, the cohesive force of the pressure-sensitive adhesive layer is increased, and the drop impact resistance of the double-sided pressure-sensitive adhesive tape is improved.
  • the content of the structural unit When the content of the structural unit is 40% by weight or less, it is possible to suppress the cohesive force of the pressure-sensitive adhesive layer from being excessively lowered, and the drop impact resistance of the double-sided pressure-sensitive adhesive tape is improved.
  • the acrylic copolymer can be copolymerized, if necessary, other than the structural unit derived from the 2-ethylhexyl acrylate and the structural unit derived from the (meth) acrylic acid alkyl ester having an alkyl group having 4 or less carbon atoms. It may contain structural units derived from other polymerizable monomers.
  • the other copolymerizable monomer include a (meth) acrylic acid alkyl ester having an alkyl group having 13 to 18 carbon atoms, a functional monomer and the like.
  • Examples of the (meth) acrylic acid alkyl ester having an alkyl group having 13 to 18 carbon atoms include tridecylic methacrylate and stearyl (meth) acrylic acid.
  • Examples of the functional monomer include hydroxyalkyl (meth) acrylic acid, glycerin dimethacrylate, glycidyl (meth) acrylate, 2-methacryloyloxyethyl isocyanate, (meth) acrylic acid, itaconic acid, maleic anhydride, and crotonic acid. Maleic acid, fumaric acid and the like can be mentioned. These other copolymerizable monomers may be used alone or in combination of two or more.
  • a functional monomer having a polar functional group such as a hydroxyl group or a carboxyl group is preferable, and a functional monomer having a hydroxyl group is preferable because the gel fraction of the pressure-sensitive adhesive layer can be easily adjusted by forming a cross-linked structure with the cross-linking agent.
  • Functional monomers are more preferred. That is, the acrylic copolymer preferably contains a hydroxyl group.
  • the weight average molecular weight (Mw) of the acrylic copolymer has a preferable lower limit of 300,000 and a preferable upper limit of 2 million.
  • the pressure-sensitive adhesive layer has an appropriate hardness, sufficient cohesive force, and high adhesive force.
  • the weight average molecular weight is 2 million or less, the adhesive strength of the pressure-sensitive adhesive layer is sufficient.
  • the more preferable lower limit of the weight average molecular weight is 500,000, and the more preferable upper limit is 1.4 million.
  • the polymerization conditions such as the polymerization initiator and the polymerization temperature may be adjusted.
  • Examples of the polymerization initiator include organic peroxides and azo compounds.
  • Examples of the organic peroxide include 1,1-bis (t-hexyl peroxy) -3,3,5-trimethylcyclohexane, t-hexyl peroxypivalate, t-butylperoxypivalate, 2,5.
  • the azo compound is not particularly limited as long as it is generally used for radical polymerization.
  • azo compound examples include 2,2'-azobis (isobutyronitrile), 2,2'-azobis (2-methylbutyronitrile), and 2,2'-azobis (2,4-dimethylvaleronitrile).
  • 1,1-azobis (cyclohexane-1-carbonitrile) 1-[(1-cyano-1-methylethyl) azo] Formamide
  • 4,4'-azobis (4-cyanovalerian acid) dimethyl-2,2'-azobis (2-methylpropionate), dimethyl-1,1'-azobis (1-cyclohexanecarboxylate)
  • the polymerization initiator that initiates living radical polymerization is not particularly limited, but an organic tellurium polymerization initiator is preferable. These polymerization initiators may be used alone or in combination of two or more.
  • a dispersion stabilizer may be used when the above-mentioned monomer mixture is radically reacted.
  • the dispersion stabilizer include polyvinylpyrrolidone, polyvinyl alcohol, methyl cellulose, ethyl cellulose, poly (meth) acrylic acid, poly (meth) acrylic acid ester, polyethylene glycol and the like.
  • the polymerization solvent is not particularly limited.
  • a non-polar solvent such as hexane, cyclohexane, octane, toluene, or xylene can be used.
  • a highly polar solvent such as water, methanol, ethanol, propanol, butanol, acetone, methyl ethyl ketone, methyl isobutyl ketone, tetrahydrofuran, dioxane, N, N-dimethylformamide can be used.
  • These polymerization solvents may be used alone or in combination of two or more.
  • the polymerization temperature is preferably 0 to 110 ° C. from the viewpoint of the polymerization rate.
  • tackifier examples include rosin-based resin, rosin ester-based resin, hydrogenated rosin-based resin, terpene-based resin, terpene phenol-based resin, kumaron inden-based resin, alicyclic saturated hydrocarbon-based resin, and C5-based petroleum.
  • resins examples include resins, C9-based petroleum resins, and C5-C9 copolymerized petroleum resins.
  • These tackifiers may be used alone or in combination of two or more. Of these, a rosin-based resin or a terpene-based resin is preferable, and a rosin-based resin containing a hydroxyl group or a terpene-based resin containing a hydroxyl group is more preferable.
  • the pressure-sensitive adhesive has a preferable lower limit of the softening temperature of 70 ° C. and a preferred upper limit of 170 ° C.
  • the softening temperature is 70 ° C. or higher, it is possible to prevent the pressure-sensitive adhesive layer from becoming too soft and reducing the drop impact resistance of the double-sided adhesive tape.
  • the softening temperature is 170 ° C. or lower, the wettability of the pressure-sensitive adhesive layer to the adherend is high, and the drop impact resistance of the double-sided pressure-sensitive adhesive tape is improved.
  • a more preferable lower limit of the softening temperature is 120 ° C.
  • the softening temperature is a softening temperature measured by the JIS K2207 ring-and-ball method.
  • the tackifier has a preferred lower limit of 25 and a preferred upper limit of the hydroxyl value of 160.
  • the hydroxyl value is within the above range, the wettability of the pressure-sensitive adhesive layer to the adherend is increased, and the drop impact resistance of the double-sided adhesive tape is improved.
  • the more preferable lower limit of the hydroxyl value is 30, and the more preferable upper limit is 150.
  • the hydroxyl value can be measured by JIS K1557 (phthalic anhydride method).
  • the content of the tackifier is not particularly limited, but the preferable lower limit with respect to 100 parts by weight of the acrylic copolymer is 10 parts by weight, and the preferable upper limit is 60 parts by weight.
  • the content of the pressure-sensitive adhesive is 10 parts by weight or more, the adhesive strength of the pressure-sensitive adhesive layer is high.
  • the content of the pressure-sensitive adhesive is 60 parts by weight or less, it is possible to prevent the pressure-sensitive adhesive layer from becoming too hard and reducing the adhesive strength.
  • the pressure-sensitive adhesive layer has a cross-linked structure formed between the main chains of the resin (for example, the acrylic copolymer, the pressure-sensitive adhesive, etc.) constituting the pressure-sensitive adhesive layer by adding a cross-linking agent.
  • a cross-linking agent for example, the acrylic copolymer, the pressure-sensitive adhesive, etc.
  • the above-mentioned cross-linking agent is not particularly limited, and examples thereof include isocyanate-based cross-linking agents, aziridine-based cross-linking agents, epoxy-based cross-linking agents, and metal chelate-type cross-linking agents. Of these, isocyanate-based cross-linking agents are preferable.
  • the preferable lower limit is 0.01 parts by weight and the preferable upper limit is 10 parts by weight with respect to 100 parts by weight of the acrylic copolymer, the more preferable lower limit is 0.1 parts by weight, and the more preferable upper limit is 3. It is a part by weight.
  • the pressure-sensitive adhesive layer may contain a silane coupling agent for the purpose of improving the adhesive strength.
  • the silane coupling agent is not particularly limited, and examples thereof include epoxysilanes, acrylicsilanes, methacrylsilanes, aminosilanes, and isocyanatesilanes.
  • the pressure-sensitive adhesive layer may contain a coloring material for the purpose of imparting light-shielding properties.
  • the coloring material is not particularly limited, and examples thereof include carbon black, aniline black, and titanium oxide. Of these, carbon black is preferable because it is relatively inexpensive and chemically stable.
  • the gel fraction of the pressure-sensitive adhesive layer is not particularly limited, but the preferable lower limit is 1% by weight and the preferable upper limit is 90% by weight.
  • the gel fraction is 1% by weight or more, the cohesive force of the pressure-sensitive adhesive layer is increased, and the drop impact resistance of the double-sided pressure-sensitive adhesive tape is improved.
  • the gel fraction is 90% by weight or less, it is possible to suppress the wettability of the pressure-sensitive adhesive layer from being excessively lowered to the adherend, and the drop impact resistance of the double-sided pressure-sensitive adhesive tape is improved.
  • the more preferable lower limit of the gel fraction is 20% by weight, the more preferable upper limit is 70% by weight, the further preferable lower limit is 30% by weight, and the further preferable upper limit is 50% by weight.
  • the gel fraction of the pressure-sensitive adhesive layer can be measured by the following method.
  • a test piece is prepared by cutting the double-sided adhesive tape into a flat rectangular shape of 50 mm ⁇ 100 mm.
  • the test piece is immersed in ethyl acetate at 23 ° C. for 24 hours, then removed from ethyl acetate and dried under the condition of 110 ° C. for 1 hour.
  • the weight of the test piece after drying is measured, and the gel fraction is calculated using the following formula (5). It is assumed that the test piece is not laminated with a release film for protecting the pressure-sensitive adhesive layer.
  • the thickness of the pressure-sensitive adhesive layer is not particularly limited, but the preferable lower limit of the thickness of the pressure-sensitive adhesive layer on one side is 20 ⁇ m, and the preferable upper limit is 100 ⁇ m. When the thickness of the pressure-sensitive adhesive layer is 20 ⁇ m or more, the adhesive strength of the pressure-sensitive adhesive layer is sufficient. When the thickness of the pressure-sensitive adhesive layer is 100 ⁇ m or less, the stress relaxation property of the foam base material can sufficiently contribute to the stress relaxation property of the double-sided adhesive tape as a whole.
  • a more preferable lower limit of the thickness of the pressure-sensitive adhesive layer is 25 ⁇ m, a more preferable upper limit is 80 ⁇ m, a further preferable lower limit is 30 ⁇ m, a further preferable upper limit is 70 ⁇ m, a further preferable lower limit is 35 ⁇ m, and a further preferable upper limit is 65 ⁇ m. ..
  • the thickness of the pressure-sensitive adhesive layer can be measured using a dial thickness gauge (for example, "ABS Digimatic Indicator" manufactured by Mitutoyo Co., Ltd.).
  • the thickness of the double-sided adhesive tape of the present invention is not particularly limited, but a preferable lower limit is 100 ⁇ m and a preferable upper limit is 1200 ⁇ m. When the thickness is 100 ⁇ m or more, the adhesive strength of the double-sided adhesive tape is sufficient, and the stress relaxation property is also sufficient. When the thickness is 1200 ⁇ m or less, sufficient adhesion and fixing with the double-sided adhesive tape can be realized.
  • a more preferable lower limit of the thickness is 250 ⁇ m, a more preferable upper limit is 900 ⁇ m, a further preferable lower limit is 350 ⁇ m, a further preferable upper limit is 700 ⁇ m, a further preferable lower limit is 400 ⁇ m, and a further preferable upper limit is 650 ⁇ m.
  • Examples of the method for producing the double-sided adhesive tape of the present invention include the following methods. First, a solvent is added to an acrylic copolymer, a pressure-sensitive adhesive, a cross-linking agent, etc. to prepare a solution of the pressure-sensitive adhesive A, and the solution of the pressure-sensitive adhesive A is applied to the surface of the foam base material. The solvent in the solution is completely dried and removed to form the pressure-sensitive adhesive layer A. Next, the release film is superposed on the formed pressure-sensitive adhesive layer A so that the release-treated surface faces the pressure-sensitive adhesive layer A. Next, a release film different from the release film is prepared, a solution of the adhesive B is applied to the release-treated surface of the release film, and the solvent in the solution is completely dried and removed to release the film.
  • a laminated film in which the pressure-sensitive adhesive layer B is formed on the surface of the mold film is produced.
  • the obtained laminated film is laminated on the back surface of the foam base material on which the pressure-sensitive adhesive layer A is formed so that the pressure-sensitive adhesive layer B faces the back surface of the foam base material to prepare a laminate.
  • the laminate is pressed by a rubber roller or the like. This makes it possible to obtain a double-sided adhesive tape having adhesive layers on both sides of the foam base material and having the surface of the adhesive layer covered with a release film.
  • two sets of laminated films are produced in the same manner, and these laminated films are laminated on both sides of the foam base material by laminating the pressure-sensitive adhesive layer of the laminated film on each side of the foam base material so as to face the foam base material.
  • a body may be produced and the laminated body may be pressurized with a rubber roller or the like. This makes it possible to obtain a double-sided adhesive tape having adhesive layers on both sides of the foam base material and having the surface of the adhesive layer covered with a release film.
  • the use of the double-sided adhesive tape of the present invention is not particularly limited, and is used, for example, for fixing parts in an electronic device.
  • the electronic device is not particularly limited, and examples thereof include a television, a monitor, a portable electronic device, an in-vehicle electronic device, and the like.
  • the double-sided adhesive tape of the present invention is suitably used for fixing parts in display devices such as televisions and monitors, particularly in relatively large display devices.
  • display devices such as televisions and monitors, particularly in relatively large display devices.
  • the surface cover panel in the above display device Is used to fix the housing to the housing. Since the double-sided adhesive tape of the present invention has excellent drop impact resistance and can reduce display unevenness of the display device, it is a case where parts are fixed by a narrow double-sided adhesive tape in a relatively large display device.
  • the double-sided adhesive tape of the present invention may have a narrow width, and the width is not particularly limited, but a preferable lower limit is 1000 ⁇ m, a preferable upper limit is 10000 ⁇ m, a more preferable lower limit is 1500 ⁇ m, and a more preferable upper limit is 5000 ⁇ m.
  • the shape of the double-sided adhesive tape of the present invention in these applications is not particularly limited, and examples thereof include a rectangle, a frame, a circle, an ellipse, and a donut. Further, the double-sided adhesive tape of the present invention may be used for the interior and exterior of vehicles, home appliances (for example, TVs, air conditioners, refrigerators, etc.).
  • a double-sided adhesive tape which is excellent in drop impact resistance, can reduce display unevenness of a display device, and can easily tear a foam base material when peeled from an adherend. can do.
  • Polyisocyanate (dinuclear monomeric MDI, manufactured by Tosoh Corporation) was adjusted and added thereto so as to have an isocyanate index of 85. Then, it was mixed and stirred with nitrogen gas so as to be 0.2 g / cm 3, and a solution containing fine bubbles was obtained. The solution was applied to a predetermined thickness on a PET separator (manufactured by nippers, V-2) having a thickness of 50 ⁇ m using an applicator, and the foam raw material was reacted to obtain a polyurethane foam. The shear breaking strength, 25% compressive strength, and thickness of the polyurethane foam were measured.
  • a polyurethane foam was obtained in the same manner as in the production of polyurethane foam 1-1 (PU1-1) except for the following points.
  • PPG polypropylene glycol
  • 5 parts by weight of 1,5-pentanediol 5 parts by weight of 1,6-hexamethylenediol were used.
  • Polyisocyanate (dinuclear monomeric MDI, manufactured by Tosoh Corporation) was adjusted to have an isocyanate index of 85 and charged.
  • a polyurethane foam was obtained in the same manner as in the production of polyurethane foam 1-1 (PU1-1) except for the following points.
  • the polyol 90 parts by weight of polypropylene glycol (PPG) (weight average molecular weight 1000), 5 parts by weight of 1,5-pentanediol, and 5 parts by weight of neopentyl glycol were used.
  • PPG polypropylene glycol
  • polyurethane foam 2 (Manufacturing of polyurethane foam 2 (PU2)) A polyurethane foam was obtained in the same manner as in the production of polyurethane foam 1-1 (PU1-1) except for the following points.
  • the polyol 85 parts by weight of polypropylene glycol (PPG) (weight average molecular weight 1000), 3 parts by weight of 1,6-hexamethylenediol, 3 parts by weight of neopentyl glycol, and 9 parts by weight of ⁇ -caprolactone were used.
  • Polyisocyanate Polymeric MDI, manufactured by Tosoh Corporation was adjusted to have an isocyanate index of 90 and charged.
  • a polyurethane foam was obtained in the same manner as in the production of polyurethane foam 1-1 (PU1-1) except for the following points.
  • PPG polypropylene glycol
  • ⁇ -caprolactone 9 parts by weight of ⁇ -caprolactone were used.
  • Polyisocyanate Polymeric MDI, manufactured by Tosoh Corporation was adjusted to have an isocyanate index of 100 and charged.
  • the nitrogen gas to be mixed was adjusted, and the thickness when the solution containing fine bubbles was applied onto a PET separator (manufactured by nippers, V-2) having a thickness of 50 ⁇ m was changed (thinned).
  • a polyurethane foam was obtained in the same manner as in the production of polyurethane foam 1-1 (PU1-1) except for the following points.
  • PU3-2 Polyurethane foam 1-1
  • Polyol 91 parts by weight of polypropylene glycol (PPG) (weight average molecular weight 1000) and 9 parts by weight of ⁇ -caprolactone were used.
  • PPG polypropylene glycol
  • Polyisocyanate Polymeric MDI, manufactured by Tosoh Corporation was adjusted to have an isocyanate index of 100 and charged.
  • a polyurethane foam was obtained in the same manner as in the production of polyurethane foam 1-1 (PU1-1) except for the following points.
  • PPG polypropylene glycol
  • 5 parts by weight of 1,5-pentanediol 5 parts by weight of 1,6-hexamethylenediol were used.
  • Polyisocyanate (dinuclear monomeric MDI, manufactured by Tosoh Corporation) was adjusted to have an isocyanate index of 75 and charged.
  • a polyurethane foam was obtained in the same manner as in the production of polyurethane foam 1-1 (PU1-1) except for the following points.
  • PPG polypropylene glycol
  • 1,6-hexamethylenediol were used.
  • Polyisocyanate dinuclear monomeric MDI, manufactured by Tosoh Corporation was adjusted to have an isocyanate index of 95 and charged.
  • a polyurethane foam was obtained in the same manner as in the production of polyurethane foam 1-1 (PU1-1) except for the following points.
  • PPG polypropylene glycol
  • NPG polypropylene glycol
  • Polyisocyanate dinuclear monomeric MDI, manufactured by Tosoh Corporation was adjusted to have an isocyanate index of 70 and charged.
  • a polyurethane foam was obtained in the same manner as in the production of polyurethane foam 1-1 (PU1-1) except for the following points.
  • PPG polypropylene glycol
  • ⁇ -caprolactone 9 parts by weight of ⁇ -caprolactone were used.
  • Polyisocyanate Polymeric MDI, manufactured by Tosoh Corporation was adjusted to have an isocyanate index of 110 and charged.
  • a polyurethane foam was obtained in the same manner as in the production of polyurethane foam 3-1 (PU3-1) except for the following points.
  • PPG polypropylene glycol
  • ⁇ -caprolactone 9 parts by weight of ⁇ -caprolactone were used.
  • Polyisocyanate Polymeric MDI, manufactured by Tosoh Corporation was adjusted to have an isocyanate index of 85 and charged.
  • a polyurethane foam was obtained in the same manner as in the production of polyurethane foam 1-1 (PU1-1) except for the following points.
  • Polyisocyanate dinuclear monomeric MDI, manufactured by Tosoh Corporation
  • the nitrogen gas to be mixed was adjusted, and the thickness when the solution mixed with fine bubbles was applied onto a PET separator (manufactured by nippers, V-2) having a thickness of 50 ⁇ m was changed (thickened).
  • a polyurethane foam was obtained in the same manner as in the production of polyurethane foam 1-1 (PU1-1) except for the following points.
  • the polyol 30 parts by weight of polypropylene glycol (PPG) (weight average molecular weight 1000), 60 parts by weight of polypropylene glycol (PPG) (weight average molecular weight 3100), and 10 parts by weight of 1,5-pentanediol were used.
  • Polyisocyanate Polymeric MDI, manufactured by Tosoh Corporation
  • the nitrogen gas to be mixed was adjusted, and the thickness when the solution mixed with fine bubbles was applied onto a PET separator (manufactured by nippers, V-2) having a thickness of 50 ⁇ m was changed (thickened).
  • a polyurethane foam was obtained in the same manner as in the production of polyurethane foam 1-1 (PU1-1) except for the following points.
  • the polyol 20 parts by weight of polypropylene glycol (PPG) (weight average molecular weight 1000), 70 parts by weight of polypropylene glycol (PPG) (weight average molecular weight 3100), and 10 parts by weight of 1,5-pentanediol were used.
  • Polyisocyanate Polymeric MDI, manufactured by Tosoh Corporation
  • the nitrogen gas to be mixed was adjusted, and the thickness when the solution mixed with fine bubbles was applied onto a PET separator (manufactured by nippers, V-2) having a thickness of 50 ⁇ m was changed (thickened).
  • Polyethylene foam 1 (PE1)) XLIM # 15003 (manufactured by Sekisui Chemical Co., Ltd.) was used as the polyethylene foam.
  • the weight average molecular weight (Mw) and the molecular weight distribution (Mw / Mn) of the obtained acrylic copolymer were determined. Specifically, the obtained acrylic copolymer-containing solution was diluted 50-fold with tetrahydrofuran (THF), and the obtained diluted solution was filtered through a filter (material: polytetrafluoroethylene, pore diameter: 0.2 ⁇ m). .. The obtained filtrate was supplied to a gel permeation chromatograph (manufactured by Waters, 2690 Separations Model), and GPC measurement was performed under the conditions of a sample flow rate of 1 ml / min and a column temperature of 40 ° C. to convert the acrylic copolymer into polystyrene.
  • THF tetrahydrofuran
  • the molecular weight was measured to determine the weight average molecular weight and the molecular weight distribution (Mw / Mn).
  • the weight average molecular weight was 1 million, and the molecular weight distribution (Mw / Mn) was 2.6.
  • a GPC KF-806L manufactured by Showa Denko KK was used as the column, and a differential refractometer was used as the detector.
  • Ethyl acetate was added to 100 parts by weight of the non-volatile content of the obtained acrylic copolymer-containing solution and stirred, and 5 parts by weight of a cross-linking agent (isocyanate-based cross-linking agent, Coronate L-55E, manufactured by Toso Co., Ltd.) and a tackifier were added. A total of 30 parts by weight was added and stirred to obtain a pressure-sensitive adhesive I having a non-volatile content of 30% by weight.
  • a cross-linking agent isocyanate-based cross-linking agent, Coronate L-55E, manufactured by Toso Co., Ltd.
  • tackifier 10 parts by weight of a hydrogenated rosin resin (softening point 100 ° C., hydroxyl value 40 mgKOH / g), 10 parts by weight of a rosin ester resin (softening point 150 ° C., hydroxyl value 40 mgKOH / g), terpene phenol type. 10 parts by weight of a resin (softening point 150 ° C., hydroxyl value 40 mgKOH / g) was used.
  • the pressure-sensitive adhesive I was applied to the support layer 1 (resin sheet) and dried at 100 ° C. for 5 minutes to form the pressure-sensitive adhesive layer 1 having a thickness of 20 ⁇ m.
  • One side of the foam base material was pressure-bonded to the pressure-sensitive adhesive layer 1 to prepare a laminated body in which the support layer 1 and the foam base material were laminated via the pressure-sensitive adhesive layer 1.
  • the support layer 1 (resin sheet) polyethylene terephthalate (PET) (X30, manufactured by Toray Industries, Inc., thickness 50 ⁇ m) was used.
  • the support layer 2 (resin sheet) is heat-sealed to the other surface of the foam base material, and the support layer 1, the pressure-sensitive adhesive layer 1, the foam base material, and the support layer 2 are laminated in this order.
  • the support layer 2 (resin sheet)
  • a release paper having a thickness of 150 ⁇ m is prepared, the adhesive I is applied to the release-treated surface of the release paper, and the adhesive layer 2 is formed at 100 ° C.
  • the pressure-sensitive adhesive layer 2 was bonded to the surface of the support layer 1 (resin sheet) laminated on the foam base material.
  • the pressure-sensitive adhesive layer 3 having the same structure as the pressure-sensitive adhesive layer 2 was bonded to the surface of the support layer 2 (resin sheet) opposite to the foam base material. Then, it was cured by heating at 40 degreeC for 48 hours. As a result, a double-sided adhesive tape covered with a release paper was obtained.
  • the tensile elastic modulus of the support layer 2 (resin sheet) was 10 MPa and 108 MPa, respectively.
  • the obtained double-sided adhesive tape was cut into a flat rectangular shape of 50 mm ⁇ 100 mm to prepare a test piece, and the test piece was immersed in ethyl acetate at 23 ° C. for 24 hours, then taken out from ethyl acetate and taken out at 110 ° C. It was dried under the conditions for 1 hour. The weight of the test piece after drying was measured, and the gel fraction of the pressure-sensitive adhesive layer was calculated using the following formula (5). As a result, the gel fraction of the pressure-sensitive adhesive layer was 42% by weight.
  • FIG. 2 shows a schematic view showing an interlayer tear test of the double-sided adhesive tape.
  • FIG. 2A is a front view
  • FIG. 2B is a side view.
  • a test piece 2 having a size of 50 mm ⁇ 5 mm and two PC plates 1 having a size of 100 mm ⁇ 20 mm and a thickness of 2 mm of double-sided adhesive tape were laminated as shown in FIG. This laminate was crimped with a weight under the conditions of 5 kg and 10 seconds, and then left for 24 hours to prepare a tear test sample in which two PC plates 1 were bonded via a test piece 2.
  • a stainless steel wire 3 (0.3 ⁇ , TRUSCO "TYWS-03" is hooked from under the test piece 2 and 300 mm in the direction of the arrow in FIG. It was pulled under the condition of / min.
  • the test force when the base material layers of the test piece 2 were torn by the wire 3 was measured.
  • the case where the test force was less than 10 N / 5 mm was indicated by ⁇
  • the case where the test force was 10 N / 5 mm or more and less than 15 N / 5 mm was indicated by ⁇
  • the case where the test force was 15 N / 5 mm or more was indicated by ⁇ .
  • FIG. 3 shows a schematic view showing a sample for a tumble test of the double-sided adhesive tape.
  • a frame-shaped test piece 6 having a long side of 23 mm, a short side of 13.3 mm, and a width of 3.2 mm of double-sided adhesive tape, and a PMMA plate 5 having a size of 55 mm x 65 mm, a thickness of 10 mm, and a weight of 42 g, and a size of 70 mm x 130 mm, thickness. It was sandwiched between a SUS plate 4 having a size of 2 mm and a weight of 137 g, and laminated as shown in FIG.
  • This laminate was crimped with a weight under the conditions of 5 kg and 10 seconds, and then left for 24 hours to prepare a sample for tumble test in which the PMMA plate 5 and the SUS plate 4 were bonded to each other via the test piece 6. ..
  • the tumble test sample was placed in a tumble tester (TDR-1000A-SC01 manufactured by Shinei Denshi Keiki Co., Ltd.), and a drop impact from various angles was repeatedly applied at a frequency of 10 drops / min. The number of drops until the double-sided adhesive tape broke and the sample for tumble test was separated was measured. The case where the number of drops was 30 or more was indicated by ⁇ , the case where the number of drops was 10 or more and less than 30 was indicated by 0, and the case where the number of drops was less than 10 was indicated by ⁇ .
  • FIG. 4 shows a schematic view showing a surface waviness test of the double-sided adhesive tape.
  • FIG. 4A is a top view and FIG. 4B is a cross-sectional view.
  • a single-sided black light-shielding tape 8 having a width of 15 mm and a thickness of 50 ⁇ m was laminated on a glass plate 10 having a size of 256 mm ⁇ 182 mm and a thickness of 4 mm at intervals of 15 mm to form a step.
  • a single-sided black light-shielding tape 9 having a width of 15 mm and a thickness of 100 ⁇ m was laminated on the glass plate 10 to form a step.
  • test pieces 7 having a width of 10 mm of double-sided adhesive tape were laminated on the four sides of the glass plate 10.
  • a glass plate 12 having a size of 256 mm ⁇ 182 mm and a thickness of 1 mm was laminated on the test piece 7, and the glass plate 10 and the glass plate 12 were bonded to each other via the test piece 7.
  • a single-sided black light-shielding tape 13 having a thickness of 100 ⁇ m was laminated on the glass plate 12 to obtain a sample for a surface waviness test.
  • a double-sided adhesive tape which is excellent in drop impact resistance, can reduce display unevenness of a display device, and can easily tear a foam base material when peeled from an adherend. can do.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Adhesive Tapes (AREA)

Abstract

La présente invention a pour objectif de fournir un ruban autoadhésif double face caractérisé par une excellente résistance aux impacts à la suite d'une chute, pouvant réduire une irrégularité d'affichage dans des dispositifs d'affichage et comprenant une base en mousse facile à déchirer et à retirer de la partie adhérée. Ce ruban autoadhésif double face comprend une base en mousse et des couches autoadhésives superposées sur les deux surfaces de la base en mousse, la base en mousse ayant une teneur cellulaire de 40 à 75 % en volume et une résistance à la rupture par cisaillement de 200 N/pouce2 à 500 N/pouce2.
PCT/JP2020/043990 2019-11-26 2020-11-26 Ruban autoadhésif double face WO2021106997A1 (fr)

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JP2016023236A (ja) * 2014-07-18 2016-02-08 積水化学工業株式会社 電子機器用粘着シート
US20160264827A1 (en) * 2013-11-25 2016-09-15 3M Innovative Properties Company Double coated tape exhibiting improved reworkable capability
JP2017506683A (ja) * 2014-02-11 2017-03-09 ロジャーズ コーポレーション 両面粘着テープ、作製方法、使用方法、およびそれにより組み立てられる物品
WO2017094723A1 (fr) * 2015-11-30 2017-06-08 積水化学工業株式会社 Feuille de mousse de résine de polyoléfine et bande adhésive
WO2017126135A1 (fr) * 2016-01-21 2017-07-27 積水化学工業株式会社 Bande adhésive double face
JP2018154820A (ja) * 2017-03-15 2018-10-04 積水化学工業株式会社 粘着テープ

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US3993833A (en) * 1976-01-19 1976-11-23 Minnesota Mining And Manufacturing Company Polyurethane foam-backed pressure-sensitive adhesive tape
JP2009242541A (ja) 2008-03-31 2009-10-22 Sekisui Chem Co Ltd 衝撃吸収テープ
JP5249625B2 (ja) 2008-04-15 2013-07-31 積水化学工業株式会社 表示装置前板用粘着シート
CN110023439B (zh) * 2017-03-29 2022-05-24 积水化学工业株式会社 双面粘合带

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Publication number Priority date Publication date Assignee Title
US20160264827A1 (en) * 2013-11-25 2016-09-15 3M Innovative Properties Company Double coated tape exhibiting improved reworkable capability
JP2017506683A (ja) * 2014-02-11 2017-03-09 ロジャーズ コーポレーション 両面粘着テープ、作製方法、使用方法、およびそれにより組み立てられる物品
JP2016023236A (ja) * 2014-07-18 2016-02-08 積水化学工業株式会社 電子機器用粘着シート
WO2017094723A1 (fr) * 2015-11-30 2017-06-08 積水化学工業株式会社 Feuille de mousse de résine de polyoléfine et bande adhésive
WO2017126135A1 (fr) * 2016-01-21 2017-07-27 積水化学工業株式会社 Bande adhésive double face
JP2018154820A (ja) * 2017-03-15 2018-10-04 積水化学工業株式会社 粘着テープ

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