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Adhesive sheet

A technology of adhesive sheets and adhesive layers, applied in the direction of adhesive types, adhesives, film/sheet adhesives, etc., can solve problems such as poor stress relaxation, micro-dispersion state damage, and poor peeling, and achieve good Effects of stress relaxation, good initial adhesion, and good adhesion over time

Inactive Publication Date: 2013-08-21
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this surface protection film has a problem of contaminating painted steel sheets, etc., with phosphate ester-based surfactants as peeling components.
Also, styrenic A-B-A block polymers lack stress relaxation due to their pseudo-crosslinked structure based on styrene domains
Therefore, when the above-mentioned surface protective film is attached to a painted steel sheet or the like, problems such as the following problems arise: Steps due to film sticking marks tend to occur on the surface of the painted steel sheet.
However, among these surface protection films, the surface protection film that can obtain good adhesive strength contains styrene-based A-B-A type block polymers such as SEBS and SEPS in the adhesive layer. Due to the influence of the block, the problem of poor peeling and material transfer occurs in long-term storage
Furthermore, an adhesive layer formed of a mixed system of an α-olefin copolymer and a hydrogenated styrene-based A-B-A type block polymer has the problem that since the adhesive is mechanically kneaded at the time of initial manufacture, each polymer It is in a micro-dispersed state, but the micro-dispersed state is destroyed over time when it is exposed to high temperature outdoors for a long time, and phase separation occurs, resulting in slurry residue
In addition, the α-olefin copolymers used in these surface protection films have a disadvantage of poor stress relaxation due to their crystallized parts, and when the surface protection film is attached to the surface of a painted steel plate, etc., there is a problem that film sticking marks are likely to occur. question

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] As a material for forming the adhesive layer, 17% by weight of hydrogenated resin was added to a mixture composed of 80% by weight of propylene-based copolymer (1) and 20% by weight of ethylene / vinyl acetate copolymer (manufactured by Tosoh Corporation, Ultracene 633). An adhesive composition based on petroleum resin (manufactured by Arakawa Chemical Co., Ltd., Alcon P-125), as a material for forming a black layer of the base material intermediate layer, 1% by weight of carbon black (manufactured by Mitsubishi Chemical, carbon black "# 45") low-density polyethylene (manufactured by Tosoh Corporation, Petrothene 172), and the above-mentioned low-density polyethylene (manufactured by Dainichi Seika Co., Ltd., HCM2035W) added with 20% by weight of white pigment was used as a material for forming the white layer of the surface layer of the substrate. Polyethylene, each material is co-extruded by blow molding to obtain a surface protection sheet (1).

[0095] The thickness o...

Embodiment 2

[0097] In Example 1, an adhesive composed of 80% by weight of the propylene-based copolymer (1) and 20% by weight of linear low-density polyethylene (manufactured by Idemitsu Petrochemical Co., Ltd., Idemitsu LL1014G) was used as the forming material of the adhesive layer. Except for the composition, it carried out similarly to Example 1, and obtained the surface protection sheet (2).

[0098] The thickness of the surface protection sheet (2) is white-colored layer / black-colored layer / adhesive layer=25 μm / 25 μm / 15 μm.

Embodiment 3

[0100] As a material for forming the adhesive layer, 9% by weight of hydrogenated terpene was added to a mixture composed of 90% by weight of the propylene-based copolymer (1) and 10% by weight of random polypropylene (manufactured by Idemitsu Petrochemical Co., Ltd., F-744NP). An adhesive composition of vinyl resin (manufactured by YASUHARA CHEMICAL, Clearon P-105) was used as a material for forming the white layer of the surface layer of the base material, with the addition of 0.7 The material of weight % fatty acid amide, 20 weight % white pigment (manufactured by Dainichi Seika Co., Ltd., HCM2035W) is used as the material of the black color layer forming the base material intermediate layer. 0.3% by weight of ultraviolet absorber (manufactured by Ciba Specialty Chemicals, Tinuvin), 0.22% by weight of light stabilizer (manufactured by Ciba Specialty Chemicals, Chimassorb), 1% by weight of carbon black (manufactured by Mitsubishi Chemicals, carbon black "#45") Each material ...

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Abstract

The invention provides an adhesive sheet. The adhesive sheet has the advantages of excellent weatherability, good initial adhesiveness, excellent peeling property and good age adhesiveness even the adhesive sheet is in the ageing process after outdoor exposure or high temperature preservation, and good stress relaxation property. The adhesive sheet is obtained through forming an adhesive layer on at least one side of a substrate layer, the substrate includes at least one layer selected from a white series layer and a black series layer, the adhesive layer is formed through an adhesive containing a propylene series copolymer (A) and a resin (B), the propylene series copolymer (A) includes propylene and C2-12 alpha-olefin except propylene as copolymerization components, and the resin (B) comprises at least one selected from a crystalline olefin blocked C-B-C thermoplastic elastomer (B represents a conjugated diene polymer block and C represents a crystalline polyolefin block) hydride, homopolymerized polypropylene, an ethylene / alpha-olefin biopolymer, a propylene / alpha-olefin biopolymer, low density polyethylene, high density polyethylene and straight-chain low density polyethylene.

Description

technical field [0001] The present invention relates to an adhesive sheet. The pressure-sensitive adhesive sheet of the present invention is useful as a pressure-sensitive adhesive sheet having releasability, such as a surface protection sheet and a positioning pressure-sensitive adhesive sheet for electronic components. The pressure-sensitive adhesive sheet of the present invention is attached to metal plates, painted metal plates, aluminum alloy frames, resin plates, decorative steel plates, vinyl chloride-laminated steel plates, glass plates, etc. during transportation, processing, and maintenance. The surface of the part, the use for protecting the surface of the part, etc. Background technique [0002] The required properties of the surface protection sheet include that the surface protection sheet does not buckle or peel off after being attached to the adherend, and that the adhesive does not remain on the adherend when it is peeled off. In particular, when the adhes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/02C09J123/14C09J123/08C09J131/04C09J153/00C09J123/12C09J123/06C09J7/29
CPCC09J7/02C09J7/0275C09J123/14C09J7/387C09J7/243C09J7/29C08L23/06C08L23/0815C08L23/0853C08L23/14
Inventor 武田公平生岛伸祐山户二郎
Owner NITTO DENKO CORP
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