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laminate

A laminated body and laminated structure technology, applied in the direction of coating, layered products, metal layered products, etc., can solve the problems of reduced adhesion, foam damage, small area, etc.

Pending Publication Date: 2021-06-08
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the foam is stretched above a certain level or a force is applied to it, the foam breaks to have a smaller area or becomes thinner
As a result, the following problem occurs: the cell portion of the foam occupies most of the bonding portion of the sheet, thereby reducing its adhesiveness
However, the prior art pressure-sensitive adhesive sheet alone cannot achieve these properties at the same time, and thus there is a need for being able to simultaneously exhibit high adhesive strength and high impact resistance to various adherends usable for mobile devices. technology needs

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0188] Now, the present invention is specifically described by way of examples. However, the present invention is by no means limited to the Examples. Tests and evaluation methods in Examples and the like are as follows. The term "part" in the following specification means "part by weight" unless otherwise specified, and the term "%" in the following specification means "wt%" unless otherwise specified.

[0189]

[0190] The weight average molecular weight is determined from the value obtained by gel permeation chromatography (GPC) in terms of standard polystyrene. An apparatus available under the model name "HLC-8320GPC" (column: TSKgel GMH-H(S), manufactured by Tosoh Corporation) was used as the GPC apparatus.

[0191]

[0192] The thickness of the reinforcing agent layer was measured using a laser microscope (manufactured by Keyence Corporation, VK-X250).

[0193]

[0194] (1. Manufacture of laminated structure of reinforcing agent layer and SUS plate for adhesive ...

manufacture example 1

[0209] [Manufacture Example 1]: Manufacture of pressure-sensitive adhesive sheet (1)

[0210] Put 95 parts of butyl acrylate (BA) and 5 parts of acrylic acid (AA) as monomer components, and 233 parts of ethyl acetate as a polymerization solvent into a mixer, a thermometer, a nitrogen inlet tube, a reflux condenser, and a dropping The reaction vessel was placed in a liquid funnel and stirred for 2 hours while nitrogen gas was introduced into the vessel. After the oxygen in the polymerization system has been removed as described above, 0.2 parts of 2,2′-azobisisobutyronitrile was added to the mixture as a polymerization initiator, and the whole was subjected to solution polymerization at 60° C. for 8 hours to A solution of an acrylic polymer is provided. The weight average molecular weight of the acrylic polymer was 700,000.

[0211] With respect to 100 parts of the acrylic polymer in the obtained acrylic polymer solution, 20 parts of terpene-phenol resin (product name: "YS PO...

manufacture example 2

[0214] [Manufacture Example 2]: Manufacture of pressure-sensitive adhesive sheet (2)

[0215] The pressure-sensitive adhesive composition (1) obtained in Production Example 1 was applied to the release surface of a polyester release liner (product name: "DIAFOIL MRF", manufactured by Mitsubishi Polyester Film, Inc.) having a thickness of 38 μm, And dried at 100° C. for 2 minutes to form a pressure-sensitive adhesive layer ( 2 ) having a thickness of 95 μm.

[0216] Next, the pressure-sensitive adhesive layer surface of the pressure-sensitive adhesive layer (2) on which the release liner is not disposed was bonded to a polyurethane substrate (SILKLON NES85, Okura Industrial Co., Ltd. manufacturing) on ​​each of the two surfaces. The resulting structure was passed through a laminator (0.3 MPa, speed: 0.5 m / min) once at room temperature, and then aged in an oven at 50° C. for 1 day. After that, peel off the release liner. Thus, a pressure-sensitive adhesive sheet ( 2 ) having ...

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Abstract

The invention provides a laminate, including a laminated structure of a pressure-sensitive adhesive sheet, a reinforcing agent layer, and an adherend, wherein an outermost layer of the pressure-sensitive adhesive sheet on a reinforcing agent layer side is a pressure-sensitive adhesive layer, wherein the laminate shows an adhesive strength of 20 N / 20 mm or more when the pressure-sensitive adhesive sheet is peeled from a laminated structural body of the pressure-sensitive adhesive sheet, the reinforcing agent layer, and a SUS plate at 23 DEG C. and 50% RH, and at a tensile rate of 300 mm / min and a peel angle of 180 DEG, wherein the laminate shows an adhesive strength of 20 N / 20 mm or more when the pressure-sensitive adhesive sheet is peeled from a laminated structural body of the pressure-sensitive adhesive sheet, the reinforcing agent layer, and a polycarbonate plate at 23 DEG C. and 50% RH, and at a tensile rate of 300 mm / min and a peel angle of 180 DEG, wherein the laminate shows an adhesive strength of 20 N / 20 mm or more when the pressure-sensitive adhesive sheet is peeled from a laminated structural body of the pressure-sensitive adhesive sheet, the reinforcing agent layer, and an aluminum plate at 23 DEG C. and 50% RH, and at a tensile rate of 300 mm / min and a peel angle of 180 DEG, and wherein the laminated structural body of the pressure-sensitive adhesive sheet, the reinforcing agent layer, and the SUS plate shows an impact resistance of 0.35 J or more at 23 DEG C. and 50% RH.

Description

technical field [0001] The present invention relates to laminated bodies. The present invention typically relates to a laminate including a laminated structure of a pressure-sensitive adhesive sheet, a reinforcing agent layer, and an adherend. Background technique [0002] In recent years, along with the trend of sophistication of various performances of mobile devices, sophistication of various performances of various constituent members used in mobile devices has been required. In mobile devices, pressure-sensitive adhesive sheets are sometimes used to bond casings and the like. Complication of various properties of pressure-sensitive adhesive sheets has also been required in recent years, and various studies have been conducted (for example, Japanese Patent Application Laid-Open No. 2019-147851). [0003] When a pressure-sensitive adhesive sheet to be used for a mobile device does not have high adhesive strength, the sheet is peeled during use, resulting in failure or t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/38C09J7/50C09J7/28C09J7/25C09J7/29C09J133/08C09J11/08C09J11/06
CPCC09J7/385C09J7/50C09J7/28C09J7/25C09J7/29C09J133/064C09J11/08C09J11/06C09J2400/163C09J2469/006C09J2433/00C09J2475/003C09J2475/006C08L45/00C08K5/17C08K5/34924C09J2203/326C09J2301/312B32B2255/10B32B2307/748B32B7/12B32B27/308B32B15/092B32B2250/02B32B5/02B32B27/18B32B2255/26B32B2307/732B32B2274/00B32B27/302B32B15/082B32B27/32B32B27/281B32B2270/00B32B15/18B32B27/40B32B2457/00B32B27/365B32B27/36B32B27/12B32B15/20B32B2262/101B32B15/085B32B27/08B32B27/20B32B2405/00B32B15/095B32B2250/03B32B2307/54B32B2307/546B32B2307/544B32B2311/24B32B2367/00B32B2369/00B32B2333/12B32B2375/00
Inventor 住田启迪藤田卓也丹羽理仁
Owner NITTO DENKO CORP