WO2015146982A1 - Ruban adhésif et son procédé de production - Google Patents

Ruban adhésif et son procédé de production Download PDF

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Publication number
WO2015146982A1
WO2015146982A1 PCT/JP2015/058922 JP2015058922W WO2015146982A1 WO 2015146982 A1 WO2015146982 A1 WO 2015146982A1 JP 2015058922 W JP2015058922 W JP 2015058922W WO 2015146982 A1 WO2015146982 A1 WO 2015146982A1
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WIPO (PCT)
Prior art keywords
adhesive tape
sensitive adhesive
pressure
less
sheet
Prior art date
Application number
PCT/JP2015/058922
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English (en)
Japanese (ja)
Inventor
徳之 内田
Original Assignee
積水化学工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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 KR1020167004488A priority Critical patent/KR102273309B1/ko
Priority to JP2015516336A priority patent/JP5851072B1/ja
Priority to CN201580001692.4A priority patent/CN105492559B/zh
Publication of WO2015146982A1 publication Critical patent/WO2015146982A1/fr

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    • 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
    • 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
    • B32B27/065—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 of foam
    • 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
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)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
    • 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
    • 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
    • C09J133/08—Homopolymers or copolymers of acrylic acid 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
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/22—Plastics; Metallised plastics
    • C09J7/24—Plastics; Metallised plastics based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • C09J7/241—Polyolefin, e.g.rubber
    • C09J7/243—Ethylene or propylene 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
    • 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
    • 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
    • B32B2266/00—Composition of foam
    • B32B2266/02—Organic
    • B32B2266/0214—Materials belonging to B32B27/00
    • B32B2266/025—Polyolefin
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/72—Density
    • 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
    • B32B2405/00—Adhesive articles, e.g. adhesive tapes
    • 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
    • B32B2457/00—Electrical equipment
    • 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
    • B32B2457/00—Electrical equipment
    • B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/10—Esters
    • C08F220/12—Esters of monohydric alcohols or phenols
    • C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
    • C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
    • C08F220/1804—C4-(meth)acrylate, e.g. butyl (meth)acrylate, isobutyl (meth)acrylate or tert-butyl (meth)acrylate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
    • C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays
    • 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
    • C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
    • C09J2301/16—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the structure of the carrier layer
    • 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
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2423/00—Presence of polyolefin
    • C09J2423/04—Presence of homo or copolymers of ethene
    • C09J2423/046—Presence of homo or copolymers of ethene 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
    • C09J2433/00—Presence of (meth)acrylic polymer

Definitions

  • the present invention relates to a pressure-sensitive adhesive tape and a method for producing a pressure-sensitive adhesive tape, in which a pressure-sensitive adhesive layer is laminated on at least one surface of a foamed sheet obtained by foaming and crosslinking a polyolefin-based resin.
  • a foamed sheet made of resin and having a plurality of bubbles inside has excellent buffering properties.
  • the said foam sheet is widely used as an impact-absorbing material in various electronic devices.
  • the impact absorbing material is disposed and used between a glass plate constituting the surface of the device and an image display member.
  • Patent Document 1 discloses a polyolefin resin foam obtained by foaming and crosslinking a polyolefin resin.
  • the foam automotive interior materials; vibration-damping partition plates bonded with non-combustible materials such as iron plates; backing materials for non-combustible boards bonded with inorganic and fiber mats; Outer plate of washing machine to process folded plates with sticking; Damping composite material that absorbs vibration of parts that generate vibrations such as washing tub lid by sticking with plastic plate; Rubber and polyvinyl chloride Low-frequency vibration-absorbing vibration-damping composite material that is compounded with metal powder and combined with a vibration-damping sheet; obtained by placing an adhesive on at least one side of the foam, and removing tapes for discomfort caused by vibration such as windows; plywood Examples of the laminated body include vibration damping floor materials; composite products with metal foils, films, inorganic fibers, and
  • the bubble diameter may be adjusted as appropriate in order to improve the mechanical strength and flexibility.
  • Patent Document 2 discloses a foamed sheet obtained by extrusion molding.
  • the ratio of the average cell diameter in the sheet extrusion direction to the average cell size in the sheet thickness direction is 2.5-7. Controlled within range.
  • the ratio of the average cell diameter in the sheet extrusion direction to the average cell size in the sheet width direction is controlled within the range of 2-6.
  • Patent Document 1 the use of a foam for an adhesive tape is not actively intended to be used particularly for a frame-shaped double-sided adhesive tape.
  • An object of the present invention is to provide a pressure-sensitive adhesive tape excellent in shock absorption and a method for producing the pressure-sensitive adhesive tape. Moreover, the limited object of this invention is to provide the manufacturing method of the adhesive tape and adhesive tape which are excellent in impact absorption, even if thickness is thin.
  • a foam sheet obtained by foaming and crosslinking a polyolefin-based resin and having a plurality of bubbles therein, and a first surface disposed on the first surface side of the foam sheet.
  • the foam sheet has a density of 0.5 g / cm 3 or more and 0.6 g / cm 3 or less, the 25% compressive strength of the foam sheet is 380 kPa or more and 1000 kPa or less, and the foam An adhesive tape is provided in which the ratio of the average major axis of the bubbles to the average minor axis in the plane direction perpendicular to the thickness direction of the sheet is 1.0 or more and 1.1 or less.
  • a foam sheet obtained by foaming and crosslinking a polyolefin-based resin and having a plurality of bubbles therein, and a first surface disposed on the first surface side of the foam sheet.
  • the foam sheet has a density of 0.5 g / cm 3 or more and 0.6 g / cm 3 or less, the 25% compressive strength of the foam sheet is 380 kPa or more and 1000 kPa or less, and the foam A sheet is obtained by extrusion molding, and the average diameter of the bubbles in the flow direction at the time of extrusion molding of the foamed sheet, the air bubbles in the direction orthogonal to the flow direction at the time of extrusion molding of the foamed sheet and the thickness direction of the foamed sheet.
  • an adhesive tape having a ratio of the average diameter of 0.9 to 1.1.
  • the ratio of the average major axis of the bubbles to the average minor axis in the surface direction orthogonal to the thickness direction of the foamed sheet is 1.0 or more and 1.1 or less.
  • the polyolefin resin is a polyethylene resin.
  • the thickness of the pressure-sensitive adhesive tape is 0.05 mm or more and 2 mm or less.
  • the foamed sheet has a thickness of 0.01 mm or more and 1.9 mm or less.
  • the first pressure-sensitive adhesive layer is formed of an acrylic pressure-sensitive adhesive.
  • the acrylic pressure-sensitive adhesive preferably contains an acrylic polymer and a tackifying resin.
  • the said adhesive tape is used suitably for bonding in the state whose width is 1 mm or less, and the said adhesive tape is used suitably for bonding in the frame-shaped state. It is done.
  • the pressure-sensitive adhesive tape is used for a display device and is a pressure-sensitive adhesive tape for a display device.
  • the said adhesive tape is equipped with the 2nd adhesive layer arrange
  • a polyolefin resin is foamed and cross-linked by extrusion to have a plurality of bubbles therein, and the density is 0.5 g / cm 3 or more and 0.6 g / cm 3.
  • the average diameter of the bubbles in the flow direction during extrusion molding of the foamed sheet obtained is orthogonal to the flow direction during extrusion molding of the foamed sheet obtained and the thickness direction of the foamed sheet
  • a method for producing a pressure-sensitive adhesive tape is provided in which the ratio of the bubbles to the average diameter in the direction to be adjusted is 0.9 or more and 1.1 or less.
  • the pressure-sensitive adhesive tape according to the present invention is obtained by foaming and crosslinking a polyolefin-based resin, and has a foam sheet having a plurality of bubbles therein, and a first pressure-sensitive adhesive disposed on the first surface side of the foam sheet. And an agent layer.
  • the pressure-sensitive adhesive tape according to the present invention has the configuration of each layer described above, and the density of the foamed sheet is 0.5 g / cm 3 or more and 0.6 g / cm 3 or less, and the foamed sheet is compressed by 25%. Since the strength is 380 kPa or more and 1000 kPa or less, and the ratio of the average major axis of the bubbles to the average minor axis in the plane direction perpendicular to the thickness direction of the foamed sheet is 1.0 or more and 1.1 or less, the shock absorbing property Can be increased.
  • the pressure-sensitive adhesive tape according to the present invention has the configuration of each layer described above, and the density of the foamed sheet is 0.5 g / cm 3 or more and 0.6 g / cm 3 or less, and 25% of the foamed sheet.
  • the compressive strength is 380 kPa or more and 1000 kPa or less
  • the foam sheet is obtained by extrusion molding, and the average diameter of the bubbles in the flow direction during extrusion molding of the foam sheet is the flow direction during extrusion molding of the foam sheet.
  • the ratio with respect to the average diameter of the said bubble in the direction orthogonal to the thickness direction of the said foamed sheet is 0.9 or more and 1.1 or less, shock absorbency can be improved.
  • 1A and 1B are a front sectional view and a plan sectional view of an adhesive tape according to an embodiment of the present invention.
  • 2A and 2B are a schematic perspective view and a schematic front view for explaining a test method of a drop impact resistance test of an adhesive tape.
  • FIG. 1A is a front sectional view of an adhesive tape according to an embodiment of the present invention.
  • FIG. 1B is a cross-sectional plan view taken along the line II of FIG. In FIG. 1, the thickness, size, and shape of each layer and bubble are appropriately changed from the actual size and shape for convenience of illustration.
  • the adhesive tape 1 shown in FIG. 1 is a double-sided adhesive tape.
  • the pressure-sensitive adhesive tape 1 includes a foam sheet 2, a first pressure-sensitive adhesive layer 3, and a second pressure-sensitive adhesive layer 4.
  • the first pressure-sensitive adhesive layer 3 is laminated on the first surface 2 a of the foam sheet 2.
  • the 2nd adhesive layer 4 is laminated
  • the foam sheet 2 is obtained by foaming and crosslinking a polyolefin-based resin.
  • the foam sheet 2 has a plurality of bubbles 2A inside.
  • the adhesive tape is provided with the 2nd adhesive layer 4, it does not need to be provided.
  • the density of the foam sheet 2 is 0.5 g / cm 3 or more and 0.6 g / cm 3 or less.
  • the 25% compressive strength of the foamed sheet 2 is 380 kPa or more and 1000 kPa or less.
  • (first configuration) ratio of the average major axis of the bubbles 2A in the plane direction orthogonal to the thickness direction of the foam sheet 2 to the average minor axis in the plane direction orthogonal to the thickness direction of the foam sheet 2 is 1.0 or more and 1.1 or less
  • (second configuration) foamed sheet 2 is obtained by extrusion molding, and bubbles in the flow direction at the time of extrusion molding of foamed sheet 2
  • the ratio of the average diameter of 2A to the average diameter of the bubbles 2A in the direction orthogonal to the flow direction and the thickness direction of the foam sheet 2 during extrusion molding of the foam sheet 2 (average diameter in the flow direction / perpendicular to the flow direction and the thickness direction)
  • the average diameter in the direction) is 0.9 or more and 1.1 or less.
  • the flow direction at the time of extrusion molding of the foam sheet 2 corresponds to MD (Machine direction).
  • the flow direction during extrusion molding of the foam sheet 2 and the direction orthogonal to the thickness direction of the foam sheet 2 correspond to CD (Cross Machine direction).
  • the thickness direction of the foam sheet 2 corresponds to VD (vertical direction).
  • the adhesive tape 1 may have the above first configuration or the above second configuration.
  • the pressure-sensitive adhesive tape 1 may include both the first configuration and the second configuration.
  • the ratio of the average minor axis to the average major axis of the bubbles 2A in the plane direction orthogonal to the thickness direction of the foamed sheet 2 is 0.9 or more and 1.0. It is as follows.
  • the pressure-sensitive adhesive tape according to the present invention such as the pressure-sensitive adhesive tape 1 is provided with the entire configuration described above, so that the shock absorption can be improved.
  • the foamed sheet is obtained by foaming and crosslinking a polyolefin-based resin, and the bubbles have a shape that is relatively close to a circle, so that the shock absorption can be improved. Even when an impact is applied to an article using the pressure-sensitive adhesive tape according to the present invention, the article is hardly damaged, and further, peeling is hardly caused.
  • the pressure-sensitive adhesive tape according to the present invention even if it is used in a state of a width of 1 mm or less, sufficient impact absorbability is exhibited.
  • the bubbles in the foam sheet satisfy the above-described diameter relationship, when the pressure-sensitive adhesive tape according to the present invention is used in a width of 1 mm or less, the bubbles are connected in the width direction of the pressure-sensitive adhesive tape so that the cavity portion is formed. Even if it is formed, it is difficult for the cavity to straddle both ends of the adhesive tape (for example, the upper end and the lower end in FIG. 1B).
  • elliptical bubbles that are long in the width direction tend to straddle both ends of the adhesive tape when the bubbles are connected to form a cavity. If the hollow portion extends over both ends of the pressure-sensitive adhesive tape, it tends to be a separation starting point, but in the present invention, such a separation starting point can be made difficult to occur. Furthermore, if the cavity does not extend over both ends of the adhesive tape, the airtightness inside the frame-shaped adhesive tape can be improved.
  • the pressure-sensitive adhesive tape according to the present invention is suitably used for electronic devices as a pressure-sensitive adhesive tape for electronic devices, is suitably used by a display device as a pressure-sensitive adhesive tape for display elements, and is also suitably used as a pressure-sensitive adhesive tape for waterproofing.
  • the pressure-sensitive adhesive tape according to the present invention may have a width of 0.8 mm or less, or may be used after being cut into a width of 0.6 mm or less. Moreover, the pressure-sensitive adhesive tape according to the present invention may have a frame shape, or may be cut into a frame shape and used.
  • a polyolefin resin is foamed and cross-linked by extrusion to have a plurality of bubbles inside, and the density is 0.5 g / cm 3 or more, 0.6 g / a step of obtaining a foamed sheet having a cm 3 or less and a 25% compressive strength of 380 kPa or more and 1000 kPa or less, and a first pressure-sensitive adhesive layer on the first surface side of the foamed sheet to obtain a pressure-sensitive adhesive tape A process.
  • the method for producing an adhesive tape according to the present invention includes, in the step of obtaining the foamed sheet, the average diameter of the bubbles in the flow direction during extrusion molding of the foamed sheet obtained, the flow direction during extrusion molding of the foamed sheet obtained, and The ratio of the bubbles to the average diameter in the direction orthogonal to the thickness direction of the foamed sheet is set to 0.9 or more and 1.1 or less.
  • the foam sheet is formed by crosslinking and foaming a polyolefin resin.
  • the foam sheet is a crosslinked polyolefin resin foam sheet.
  • the foam sheet has a plurality of bubbles inside.
  • the ratio (average major axis / average minor axis) is 1.0 or more and 1.1 or less, or the ratio (average diameter in the flow direction / direction in the direction perpendicular to the flow direction and the thickness direction).
  • the average diameter is 0.9 or more and 1.1 or less.
  • the ratio (average major axis / average minor axis) is 1.0 or more and 1.1 or less, the bubbles are closer to a circular shape than the elliptical shape, and the impact absorption of the adhesive tape is increased.
  • the ratio average diameter in the flow direction / average diameter in the direction orthogonal to the flow direction and the thickness direction
  • the bubbles are closer to a circular shape than the elliptical shape, and the flow Since the number of air bubbles existing in the adhesive tape tends to be uniform in the direction and the direction perpendicular to the flow direction and the thickness direction, the shock absorption of the adhesive tape is increased.
  • the density of the foamed sheet is 0.5 g / cm 3 or more and 0.6 g / cm 3 or less. If the density of the foamed sheet is lower than 0.5 g / cm 3 , the resin density is lowered, and the strength of the base material may not be sufficiently secured. If the density of the foamed sheet is higher than 0.6 g / cm 3, there is a possibility that the shock absorbing performance of the foamed sheet cannot be sufficiently ensured.
  • the density of the foamed sheet is preferably 0.53 g / cm 3 or less.
  • the 25% compressive strength of the foam sheet is 380 kPa or more and 1000 kPa or less.
  • the 25% compressive strength is not less than the above lower limit and not more than the above upper limit, the flexibility of the foamed sheet falls within an appropriate range, and the impact absorbability tends to be good.
  • the 25% compressive strength of the foamed sheet is preferably 500 kPa or less.
  • the 25% compressive strength of the foamed sheet is measured at 23 ° C. according to JIS K6767.
  • the pressure-sensitive adhesive tape according to the present invention is excellent in shock absorption even if it is thin. For this reason, the adhesive tape which concerns on this invention can be used suitably as an adhesive tape with thin thickness.
  • the thin adhesive tape is suitably used for electronic devices that are required to be small and thin.
  • the impact absorption is further enhanced as the thickness increases. For this reason, in the adhesive tape which concerns on this invention, it can be used suitably also as an adhesive tape with thick thickness.
  • the thickness of the foam sheet is not particularly limited. Even if the thickness is small, the impact absorbability can be sufficiently increased, and it is possible to cope with downsizing and thinning of electronic devices and the like. Therefore, the thickness of the foam sheet is preferably 1.9 mm or less, more preferably 1.0 mm or less. More preferably, it is 0.5 mm or less. Since the shock absorption becomes higher as the thickness increases, the thickness of the foamed sheet is preferably 0.01 mm or more, more preferably 0.03 mm or more, and further preferably 0.04 mm or more.
  • the polyolefin resin used to form the foamed sheet is not particularly limited, but an ethylene homopolymer, an ethylene- ⁇ -olefin copolymer, an ethylene- (meth) acrylic acid copolymer, an ethylene- (meta ) Polyethylene resins such as acrylic acid ester copolymers and ethylene-vinyl acetate copolymers; polypropylene resins such as propylene homopolymers, propylene- ⁇ -olefin copolymers, and propylene-ethylene copolymers; butenes Homopolymers: Homopolymers or copolymers of conjugated dienes such as butadiene and isoprene. Examples of the polyethylene resin include high density polyethylene and low density polyethylene. The form of copolymerization may be random, block, or terpolymer.
  • the polyolefin resin may be a polyethylene resin or a polypropylene resin, may be a polyethylene resin, or may be a polypropylene resin.
  • a mixture of a polyethylene resin and a polypropylene resin may be used.
  • the polyethylene resin is obtained using ethylene as a main component.
  • the proportion of structural units derived from ethylene is preferably 50% by weight or more, more preferably 70% by weight or more, and still more preferably 90% by weight or more, in 100% by weight of all the structural units of the polyethylene resin.
  • the polypropylene resin is obtained using propylene as a main component.
  • the proportion of structural units derived from propylene is preferably 50% by weight or more, more preferably 70% by weight or more, and still more preferably 90% by weight or more in 100% by weight of all the structural units of the polypropylene resin.
  • the polyolefin resin is preferably a polyethylene resin, more preferably a low density polyethylene, and still more preferably a linear low density polyethylene.
  • the polyethylene-based resin may be an ethylene homopolymer, but the polyethylene-based resin is preferably 70% by weight or more, more preferably 90% by weight of structural units derived from ethylene in 100% by weight of all structural units. It is preferable that the polyethylene-based resin has the ⁇ -olefin structural unit in an amount of 30% by weight or less, more preferably 10% by weight or less.
  • the flexibility and impact are high. It becomes easy to obtain a foam sheet having high absorbability. Moreover, even if the thickness of the foam sheet is reduced, high performance is easily maintained.
  • an ethylene-vinyl acetate copolymer is also preferably used.
  • the proportion of structural units derived from ethylene is preferably 50% by weight or more in 100% by weight of the total structural units of the ethylene-vinyl acetate copolymer.
  • the foamed sheet preferably contains a polyethylene resin obtained using a metallocene compound polymerization catalyst, an ethylene-vinyl acetate copolymer obtained using a metallocene compound polymerization catalyst, or a mixture thereof.
  • a polyethylene resin obtained using a metallocene compound polymerization catalyst an ethylene-vinyl acetate copolymer obtained using a metallocene compound polymerization catalyst, or a mixture thereof is preferred.
  • the polypropylene resin may be a propylene homopolymer, but the polypropylene resin preferably contains 50% by weight or more of a structural unit derived from propylene in 100% by weight of all structural units, and an ⁇ -olefin structural unit. Is preferably a polypropylene resin having 50% by weight or less.
  • ⁇ -olefin examples include propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene, and 1-octene. Of these, ⁇ -olefins having 4 to 10 carbon atoms are preferred.
  • the ⁇ -olefin structural unit means a structural unit derived from the ⁇ -olefin used as a polymerization component.
  • the polyolefin resin preferably has a low density.
  • the density of the polyolefin-based resin is specifically preferably 0.920 g / cm 3 or less, more preferably 0.915 g / cm 3 or less, more preferably 0.910 g / cm 3 or less.
  • the lower limit of the density of the polyolefin resin is not particularly limited.
  • the density of the polyolefin resin is preferably 0.880 g / cm 3 or more, more preferably 0.885 g / cm 3 or more.
  • the above-mentioned polyolefin resin may be mixed with various additives described later, or may be mixed with other optional components.
  • the foamed sheet may be a foamed sheet obtained by crosslinking and foaming the mixture.
  • Examples of optional components contained in the foamed sheet include resins other than polyolefin-based resins and rubber.
  • the amount of the polyolefin resin used is preferably 50% by weight or more, more preferably 70% by weight or more.
  • the amount of components other than the polyolefin resin is preferably 50% by weight or less, more preferably 30% by weight or less.
  • the foaming of the polyolefin resin is preferably performed using a pyrolytic foaming agent, as will be described later. You may foam by the other method which does not use a thermal decomposition type foaming agent.
  • the crosslinking of the polyolefin resin is preferably performed by irradiation with ionizing radiation, as will be described later. Crosslinking may be performed by other methods using irradiation with ionizing radiation.
  • Suitable metallocene compounds include compounds such as bis (cyclopentadienyl) metal complexes having a structure in which a transition metal is sandwiched between ⁇ -electron unsaturated compounds.
  • Specific examples of suitable metallocene compounds include tetravalent transition metals such as titanium, zirconium, nickel, palladium, hafnium, and platinum, and one or more cyclopentadienyl rings or analogs thereof are ligands (ligands). ) Are present as compounds.
  • the properties of the active sites are uniform, and each active site exhibits the same activity.
  • a polymer synthesized using a metallocene compound has high uniformity such as molecular weight, molecular weight distribution, composition and composition distribution. For this reason, when the sheet
  • Examples of the ligand include a cyclopentadienyl ring and an indenyl ring.
  • substitution may be performed by a hydrocarbon group, a substituted hydrocarbon group or a hydrocarbon-substituted metalloid group.
  • Examples of the hydrocarbon group include a methyl group, an ethyl group, various propyl groups, various butyl groups, various amyl groups, various hexyl groups, 2-ethylhexyl groups, various heptyl groups, various octyl groups, various nonyl groups, and various decyl groups.
  • Various cetyl groups, and phenyl groups are examples of the “various” means various isomers including n-, sec-, tert-, and iso-.
  • a compound obtained by polymerizing a cyclic compound as an oligomer may be used as a ligand.
  • monovalent anion ligands such as chlorine and bromine or divalent anion chelate ligands, hydrocarbons, alkoxides, arylamides, aryloxides, amides, arylamides, phosphides, Aryl phosphide and the like may also be used.
  • metallocene compounds containing tetravalent transition metals and ligands include, for example, cyclopentadienyl titanium tris (dimethylamide), methylcyclopentadienyl titanium tris (dimethylamide), bis (cyclopentadienyl) titanium dichloride, and And dimethylsilyltetramethylcyclopentadienyl-t-butylamidozirconium dichloride.
  • the above-mentioned metallocene compound exhibits an action as a catalyst in the polymerization of various olefins when used in combination with a specific cocatalyst (co-catalyst).
  • co-catalyst include methylaluminoxane (MAO) and boron compounds.
  • the ratio of the cocatalyst to the metallocene compound is preferably 10 mol times or more, more preferably 50 mol times or more, preferably 1 million mol times or less, more preferably 5000 mol times or less.
  • a Ziegler-Natta compound In order to polymerize the polyolefin-based resin, a Ziegler-Natta compound may be used.
  • the Ziegler-Natta compound may be a triethylaluminum-titanium tetrachloride solid composite, which is obtained by reducing titanium tetrachloride with an organoaluminum compound and further treating with various electron donors and electron acceptors. It may be a compound produced by a method of combining a titanium trichloride composition, an organoaluminum compound, and an aromatic carboxylic acid ester (Japanese Patent Laid-Open Nos.
  • the method for producing the foam sheet is not particularly limited, and examples thereof include a production method including the following steps (1) to (4).
  • Step (1) In the above step (1), an additive such as a polyolefin resin, a pyrolytic foaming agent, and other optional components are supplied to an extruder such as a single screw extruder or a twin screw extruder, etc. It is melted and kneaded at a temperature lower than the decomposition temperature of the foaming agent, and extruded by extrusion or the like to obtain a sheet-shaped foam composition.
  • an additive such as a polyolefin resin, a pyrolytic foaming agent, and other optional components are supplied to an extruder such as a single screw extruder or a twin screw extruder, etc. It is melted and kneaded at a temperature lower than the decomposition temperature of the foaming agent, and extruded by extrusion or the like to obtain a sheet-shaped foam composition.
  • the pyrolyzable foaming agent is preferably a pyrolyzable foaming agent having a decomposition temperature higher than the melting temperature of the resin, for example.
  • a chemical foaming agent having a decomposition temperature of 160 to 270 ° C. is preferably used.
  • the chemical foaming agent may be an organic foaming agent or an inorganic foaming agent.
  • the said thermal decomposition type foaming agent may be used independently and may use 2 or more types together.
  • organic foaming agent examples include azo compounds such as azodicarbonamide, metal salts of azodicarboxylic acid (such as barium azodicarboxylate), and azobisisobutyronitrile; nitroso compounds such as N, N′-dinitrosopentamethylenetetramine Hydrazine derivatives such as hydrazodicarbonamide, 4,4′-oxybis (benzenesulfonylhydrazide), toluenesulfonylhydrazide; semicarbazide compounds such as toluenesulfonyl semicarbazide, and the like.
  • azo compounds such as azodicarbonamide, metal salts of azodicarboxylic acid (such as barium azodicarboxylate), and azobisisobutyronitrile
  • nitroso compounds such as N, N′-dinitrosopentamethylenetetramine Hydrazine derivatives such as hydrazodicarbonamide, 4,4′
  • Examples of the inorganic foaming agent include ammonium acid, sodium carbonate, ammonium hydrogen carbonate, sodium hydrogen carbonate, ammonium nitrite, sodium borohydride, and anhydrous monosodium citrate.
  • An azo compound or a nitroso compound is preferable from the viewpoint of forming fine bubbles and improving the economical efficiency and safety, and azodicarbonamide, azobisisobutyronitrile or N, N′-dinitrosopentamethylenetetramine is preferable. Is more preferable, and azodicarbonamide is still more preferable.
  • the amount of the pyrolytic foaming agent added is preferably 1 part by weight or more, more preferably 1.5 parts by weight or more, preferably 10 parts by weight or less, more preferably 5 parts by weight, relative to 100 parts by weight of the polyolefin resin. It is 3 parts by weight or less, more preferably 3 parts by weight or less.
  • additives other than the said thermal decomposition type foaming agent You may use additives other than the said thermal decomposition type foaming agent.
  • additives other than the above pyrolyzable foaming agent include decomposition temperature regulators, crosslinking aids, antioxidants, cell nucleating agents, colorants, flame retardants, antistatic agents, fillers, and the like.
  • the above-mentioned decomposition temperature adjusting agent is blended in order to lower the decomposition temperature of the thermally decomposable foaming agent, increase the decomposition rate, or adjust the decomposition rate.
  • the decomposition temperature adjusting agent include zinc oxide, zinc stearate, urea and the like.
  • the said decomposition temperature regulator may be used independently and may use 2 or more types together.
  • the amount of the decomposition temperature regulator added is preferably 0.01 parts by weight or more and preferably 5 parts by weight or less with respect to 100 parts by weight of the polyolefin resin.
  • crosslinking aid a polyfunctional monomer can be used.
  • a crosslinking aid By adding a crosslinking aid to the polyolefin-based resin, it is possible to reduce the amount of ionizing radiation irradiated in the step (2) described later, and to prevent the resin molecules from being cut and deteriorated due to the irradiation of ionizing radiation. .
  • crosslinking aid examples include trimethylolpropane trimethacrylate, trimethylolpropane triacrylate, trimellitic acid triallyl ester, 1,2,4-benzenetricarboxylic acid triallyl ester, and triallyl isocyanurate.
  • one molecule such as a compound having three functional groups in one molecule, 1,6-hexanediol dimethacrylate, 1,9-nonanediol dimethacrylate, 1,10-decanediol dimethacrylate, and divinylbenzene.
  • Examples include compounds having two functional groups, diallyl phthalate, diallyl terephthalate, diallyl isophthalate, ethyl vinyl benzene, neopentyl glycol dimethacrylate, lauryl methacrylate, and stearyl methacrylate.
  • the said crosslinking adjuvant may be used independently and may use 2 or more types together.
  • the amount of the crosslinking aid added is preferably 0.2 parts by weight or more, more preferably 0.3 parts by weight or more, still more preferably 0.5 parts by weight or more, preferably 100 parts by weight of the polyolefin resin. It is 10 parts by weight or less, more preferably 5 parts by weight or less.
  • the addition amount of the crosslinking aid is equal to or more than the lower limit, a desired degree of crosslinking of the foam sheet can be stably obtained. It is easy to control the degree of crosslinking of the foamed sheet when the addition amount of the crosslinking aid is not more than the above upper limit.
  • antioxidants examples include phenolic antioxidants such as 2,6-di-t-butyl-p-cresol.
  • the said antioxidant may be used independently and may use 2 or more types together.
  • Step (2) In said process (2), the foam composition shape
  • the crosslinking in the above step (2) is preferably performed by irradiating the foam composition with ionizing radiation.
  • ionizing radiation include ⁇ -rays, ⁇ -rays, ⁇ -rays, and electron beams, and electron beams are more preferable.
  • the amount of ionizing radiation applied to the sheet-shaped foam composition is preferably 0.3 Mrad or more, more preferably 0.5 Mrad or more, further preferably 1 Mrad or more, particularly preferably 1.5 Mrad or more, preferably 10 Mrad or less. More preferably, it is 8 Mrad or less, More preferably, it is 5.5 Mrad or less.
  • the amount of ionizing radiation applied to the sheet-shaped foam composition is preferably 0.3 Mrad or more, more preferably 0.5 Mrad or more, preferably 8 Mrad or less, more preferably 5.5 Mrad. It is as follows.
  • the irradiation amount of ionizing radiation is not less than the above lower limit value, it becomes easy to impart a shear viscosity necessary for foaming of the foam composition. Moreover, the shear viscosity of a foam composition does not become high too much that the irradiation amount of ionizing radiation is below the said upper limit, and foamability becomes favorable. For this reason, it becomes easy to obtain a foam sheet having the above-described expansion ratio, and the appearance of the foam sheet is also improved.
  • the degree of progress of crosslinking is usually affected by the type of polyolefin resin and additives, etc., it is usually preferable to adjust the irradiation amount of ionizing radiation while measuring the degree of crosslinking.
  • the amount of irradiation is controlled so that the degree of crosslinking of the foamed sheet falls within a desired range.
  • Step (3) In said process (3), a sheet-like foam composition is heated and foamed more than the decomposition temperature of a thermal decomposition type foaming agent. Usually, a process (3) is implemented after the said process (2).
  • the temperature for foaming by heating can be appropriately adjusted according to the decomposition temperature of the pyrolytic foaming agent.
  • the temperature for heating and foaming is preferably 140 ° C. or higher, more preferably 160 ° C. or higher, preferably 300 ° C. or lower, more preferably 260 ° C. or lower.
  • the method of foaming the foam composition is not particularly limited, and examples thereof include a method of heating with hot air, a method of heating with infrared rays, a method using a salt bath, and a method using an oil bath. These methods may be used in combination.
  • Step (4) In said process (4), a sheet-like foam composition is extended
  • the stretching may be performed after foaming the sheet-shaped foam composition, or may be performed while foaming the sheet-shaped foam composition. Stretching can be performed with a known apparatus such as a uniaxial stretching machine and a biaxial stretching machine.
  • the foam composition When stretching is performed after foaming the sheet-shaped foam composition, it is preferable to continue stretching while maintaining the molten state at the time of foaming without cooling the foam composition. However, after cooling the foam composition, the foam composition may be heated again to be melted or softened and then stretched.
  • the draw ratio to MD and the draw ratio to CD are respectively preferably 1.1 times or more, more preferably 1.3 times or more, preferably 5. 0 times or less, More preferably, it is 3.0 times or less, More preferably, it is 2.5 times or less.
  • the draw ratio is not less than the above lower limit and not more than the above upper limit, it is easy for the bubbles inside the foam sheet to satisfy the above first configuration or the above second configuration.
  • the draw ratio is not more than the above upper limit, the sheet-shaped foam composition is prevented from breaking during stretching, or foaming gas escapes from the foam composition being foamed to lower the foam ratio. Peeling, the flexibility and tensile strength of the foam sheet are improved, and the quality of the foam sheet becomes even more uniform.
  • Crosslinking may be performed by a method in which the foam composition is heated to decompose the organic peroxide in a state where a crosslinking agent such as an organic peroxide is added to the foam composition as an additive.
  • organic peroxide examples include 1,1-bis (t-butylperoxy) 3,3,5-trimethylcyclohexane, 1,1-bis (t-butylperoxy) cyclohexane, and the like.
  • the content of the organic peroxide is preferably 0.01 parts by weight or more, more preferably 0.1 parts by weight or more, preferably 5 parts by weight or less, more preferably 3 parts by weight with respect to 100 parts by weight of the polyolefin resin. Less than parts by weight.
  • the added amount of the organic peroxide is not less than the above lower limit and not more than the above upper limit, crosslinking of the foam composition is likely to proceed, and the amount of decomposition residue of the organic peroxide in the foamed sheet is reduced.
  • the foam composition may be foamed by gas foaming typified by carbon dioxide gas or butane gas, or foamed by a mechanical flossing method, instead of foaming using the above foaming agent.
  • the above-described foamed sheet is used as a base material.
  • An adhesive tape is obtained by forming an adhesive layer on at least one surface (first surface) or both surfaces (first and second surfaces) of the foam sheet.
  • the pressure-sensitive adhesive tape in which the pressure-sensitive adhesive layer is formed on both surfaces of the foamed sheet is a double-sided pressure-sensitive adhesive tape.
  • the thickness of the adhesive tape is preferably 0.05 mm or more, preferably 2 mm or less, more preferably 1 mm or less.
  • the thicknesses of the first and second pressure-sensitive adhesive layers are preferably 5 ⁇ m or more, more preferably 7 ⁇ m or more, still more preferably 10 ⁇ m or more, preferably 200 ⁇ m or less, more preferably 150 ⁇ m or less, and even more preferably 100 ⁇ m or less.
  • the thickness of each of the first and second pressure-sensitive adhesive layers is not less than the above lower limit and not more than the above upper limit, the thickness of the pressure-sensitive adhesive tape and the thickness of the electronic device using the pressure-sensitive adhesive tape are reduced.
  • the pressure-sensitive adhesive for forming the pressure-sensitive adhesive layer is not particularly limited, and examples thereof include an acrylic pressure-sensitive adhesive, a urethane-based pressure-sensitive adhesive, and a rubber-based pressure-sensitive adhesive.
  • a method of applying a pressure-sensitive adhesive on the foamed sheet and laminating a pressure-sensitive adhesive layer on the foamed sheet for example, a method of applying a pressure-sensitive adhesive on a foamed sheet using a coating machine such as a coater, a foamed sheet Examples thereof include a method of spraying and applying an adhesive using a spray, and a method of applying an adhesive using a brush on a foamed sheet.
  • the adhesive tape can be used in various electronic devices, for example, in an electronic device main body such as a mobile phone or a video camera.
  • the adhesive tape can be suitably used for a display device of a mobile phone.
  • the adhesive tape is preferably used in a state of being sandwiched between, for example, two members and compressed in the thickness (VD) direction. And it can use suitably as an impact-absorbing material which absorbs the impact which acts on either one or both of two members, and a sealing material which prevents that dust etc. enter between two members.
  • the impact-absorbing property which can protect suitably each component of an electronic device is obtained by using the adhesive tape of this invention for an electronic device use. Moreover, since it has suitable compressive strength, it becomes easy to improve the sealing performance between components.
  • the measuring method of each physical property in this specification is as follows.
  • ⁇ Density> The density of the stretched foam sheet was measured according to JIS K7222. The reciprocal of the density was taken as the expansion ratio.
  • ⁇ Ratio average diameter in MD / average diameter in CD
  • An enlarged photograph of the foam sheet was taken, the bubble diameters of MD, CD, and VD were measured using a digital microscope (“VHX-900” manufactured by Keyence), and the average value was calculated by averaging the measured values. From the calculated MD (flow direction at the time of extrusion molding of the foamed sheet) and the average diameter in CD (direction perpendicular to the flow direction at the time of extrusion molding of the foamed sheet and the thickness direction of the foamed sheet), the ratio (in MD Average diameter / average diameter in CD) was determined.
  • the major and minor diameters of the bubbles in the plane direction perpendicular to the thickness direction of the foamed sheet were measured, and the average values were calculated by averaging the measured values.
  • the ratio (average major axis / average minor axis) was determined from the average major axis and the average minor axis in the plane direction orthogonal to the thickness direction of the calculated foamed sheet.
  • foam sheet 100 parts by weight of polyethylene resin (linear low density polyethylene, “Exact 3027” manufactured by Exxon Chemical Co., Ltd., density: 0.900 g / cm 3 ), 1.9 parts by weight of azodicarbonamide, 2,6-di-t-butyl -Foam composition in which 0.2 parts by weight of p-cresol and 1.8 parts by weight of zinc oxide are supplied to an extruder and melt-kneaded at 130 ° C to form a long sheet and have a thickness of 0.5 mm The product was extruded.
  • polyethylene resin linear low density polyethylene, “Exact 3027” manufactured by Exxon Chemical Co., Ltd., density: 0.900 g / cm 3
  • azodicarbonamide, 2,6-di-t-butyl -Foam composition in which 0.2 parts by weight of p-cresol and 1.8 parts by weight of zinc oxide are supplied to an extruder and melt-kneaded at 130 ° C to form a long
  • both surfaces of the foam composition were irradiated with 4.5 Mrad of an electron beam with an acceleration voltage of 500 kV to crosslink the foam composition. After that, it is continuously sent into a foaming furnace maintained at 250 ° C. by hot air and an infrared heater, heated and foamed, and the average diameter, average major axis and average minor axis of the bubbles are the values shown in Table 1 below.
  • the foamed sheet having the thickness shown in Table 1 below was obtained.
  • the obtained pressure-sensitive adhesive solution was applied to the first surface of the obtained foamed sheet and dried at 100 ° C. for 5 minutes to form a pressure-sensitive adhesive layer (thickness 30 ⁇ m).
  • a mold release treatment was applied to the outer surface of the pressure-sensitive adhesive layer, and a 50 ⁇ m thick PET (polyethylene terephthalate) film was bonded thereto.
  • a PET film (thickness: 50 ⁇ m) subjected to another release treatment was prepared.
  • the pressure-sensitive adhesive solution was applied to the release-treated surface of this PET film and dried at 100 ° C. for 5 minutes to form a pressure-sensitive adhesive layer (thickness 30 ⁇ m).
  • This pressure-sensitive adhesive layer was bonded to the second surface of the foam sheet. Thereby, the double-sided adhesive tape with which both surfaces were covered with the PET film in which the mold release process was performed was obtained.
  • the obtained double-sided pressure-sensitive adhesive tape was punched out so that the outer diameter was 46 mm and the length was 61 mm, the inner diameter was 44 mm and the length was 59 mm, and a frame-shaped pressure-sensitive adhesive tape (test piece) having a width of 1 mm was produced.
  • One PET film of the frame-shaped adhesive tape 11 was peeled off.
  • a frame-shaped adhesive tape 11 (test piece) was affixed to the polycarbonate plate 12 so that the square hole was located substantially at the center.
  • a polycarbonate plate 13 having a width of 55 mm, a length of 65 mm, and a thickness of 1 mm was prepared.
  • the other PET film of the adhesive tape 11 was peeled off. From the upper surface of the pressure-sensitive adhesive tape 11, the polycarbonate plate 13 was attached so that the pressure-sensitive adhesive tape 11 was positioned substantially in the center, and the test apparatus was assembled.
  • the drop impact resistance was judged according to the following criteria.

Abstract

Cette invention concerne un ruban adhésif qui a d'excellentes propriétés amortissantes. Le ruban adhésif (1) selon l'invention comprend : une feuille de mousse (2) qui est obtenue par expansion et réticulation d'une résine polyoléfinique et comporte une pluralité d'alvéoles d'air (2A) ; et une première couche adhésive (3) qui est agencée sur une première surface (2a) de la feuille de mousse (2). La feuille de mousse (2) a une densité de 0,5 g/cm3 à 0,6 g/cm3 (inclus) et une résistance à la compression à 25 % de 380 à 1000 kPa (inclus). Le rapport de la longueur moyenne des alvéoles d'air (2A) à leur largeur moyenne dans une direction plane perpendiculaire à la direction de l'épaisseur de la feuille de mousse (2) est de 1,0 à 1,1 (inclus).
PCT/JP2015/058922 2014-03-28 2015-03-24 Ruban adhésif et son procédé de production WO2015146982A1 (fr)

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JP2015516336A JP5851072B1 (ja) 2014-03-28 2015-03-24 粘着テープ
CN201580001692.4A CN105492559B (zh) 2014-03-28 2015-03-24 粘接带及粘接带的制造方法

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JP2013053179A (ja) * 2011-08-31 2013-03-21 Sekisui Chem Co Ltd 架橋ポリオレフィン樹脂発泡シート、粘着テープ及びシール材
WO2013141167A1 (fr) * 2012-03-22 2013-09-26 Dic株式会社 Ruban adhésif sensible à la pression
WO2013154137A1 (fr) * 2012-04-13 2013-10-17 Dic株式会社 Ruban adhésif
WO2015046526A1 (fr) * 2013-09-30 2015-04-02 積水化学工業株式会社 Feuille à base de mousse de résine polyoléfinique réticulée

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020004056A1 (fr) * 2018-06-28 2020-01-02 Dic株式会社 Bande adhésive sensible à la pression et article
JPWO2020004056A1 (ja) * 2018-06-28 2020-07-09 Dic株式会社 粘着テープ及び物品

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