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A protective sheet and backside treatment technology, which is applied in the direction of film/flaky adhesives, applications, adhesive products, etc., can solve the problems of poor adhesiveness, rough surface, rough appearance, etc., to achieve small impact, sticky Excellent joint strength and good sealing effect
Inactive Publication Date: 2009-12-30
NITTO DENKO CORP
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However, this adhesive sheet uses a resin containing ethylene-α-olefin copolymer in the adhesive layer, so the adhesive layer may become hard and the adhesiveness on rough surfaces may be poor.
The surface roughness is specified in order to improve the adhesiveness, however, depending on the molding conditions, these materials sometimes have a rough appearance caused by melt fracture, and the surface becomes rough
Method used
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Embodiment 1
[0089] It will be made of low-density polyethylene (manufactured by Nippon Polyethylene Co., Ltd., LC680, MFR: 10, density: 0.936g / cm 3 ) and ethylene-vinyl acetate copolymer (manufactured by Nippon Polyethylene Co., Ltd., LV430, MFR: 1, VA content: 15%), long-chain alkyl additives (manufactured by Yifangsha Oil Industry Co., Ltd., ピロイル1010S) at 89.5 / The material for forming the backside treatment layer in a weight ratio of 5.5 / 5, including low-density polyethylene (manufactured by Tosoh Corporation, Petorosen 0M05B, MFR: 2.0, density: 0.924g / cm 3 ) base material layer forming material, and a polypropylene-based elastomer (manufactured by Sumitomo Chemical Co., Ltd., タフセレン H5002, MFR: 10, density: 0.860 g / cm 3 ) was co-extruded at a die temperature of 180° C. to form a film by blow molding to obtain a surface protection sheet with a back surface treatment layer of 5 μm / substrate layer of 50 μm / adhesive layer of 7 μm. Under these film-forming conditions, the shear rate of the...
Embodiment 2
[0091] It will be made of low-density polyethylene (manufactured by Nippon Polyethylene Co., Ltd., LC680, MFR: 10, density: 0.936g / cm 3 ) and ethylene-vinyl acetate copolymer (manufactured by Nippon Polyethylene Co., Ltd., LV430, MFR: 1, VA content: 15%), long-chain alkyl additives (manufactured by Yifangsha Oil Industry Co., Ltd., ピロイル1010S) at 89.5 / The material for forming the backside treatment layer in a weight ratio of 5.5 / 5, including low-density polyethylene (manufactured by Tosoh Corporation, Petorosen 0M05B, MFR: 2.0, density: 0.924g / cm 3 ) base material layer forming material, and a polypropylene-based elastomer (manufactured by Sumitomo Chemical Co., Ltd., タフセレン H5002, MFR: 10, density: 0.860 g / cm 3 ) was co-extruded at a die temperature of 180° C. to form a film by blow molding to obtain a surface protection sheet with a back surface treatment layer of 5 μm / substrate layer of 50 μm / adhesive layer of 7 μm. The shear rate at this time was 9.4 (l / s), and the shear s...
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Abstract
A surface protection sheet including a base layer and a pressure-sensitive adhesive layer which have been formed by coextrusion. The surface protection sheet has satisfactory suitability for unwinding from a roll, etc., and the pressure-sensitive adhesive layer has a smooth surface and satisfactory adhesion to rough surfaces, is free from release ingredient transfer thereto, and hence poses no problem concerning contamination. The surface protection sheet comprises: a base layer comprising a thermoplastic resin; a pressure-sensitive adhesive layer formed on one side of the base layer; and a back treatment layer formed on the other side and comprising a polyethylene resin. The surface protection sheet is characterized in that the base layer, pressure-sensitive adhesive layer, and back treatment layer have been integrally formed by coextrusion molding and the pressure-sensitive adhesive layer contains a noncrystalline polyolefin elastomer in an amount of 50 wt.% or larger.
Description
technical field [0001] The present invention relates to a surface protection sheet. The surface protection sheet of the present invention can be used, for example, in optical films such as metal plates, painted plates, aluminum frames, resin plates, painted steel plates, vinyl chloride laminated steel plates, glass plates, optical films for liquid crystals such as polarizing films, and liquid crystal panels. Applications such as sticking protection on the surface of components, electronic components, etc. during transportation, processing, or maintenance. Background technique [0002] In the surface protection sheet, an adhesive layer may be provided on one side of the base sheet, and a release layer may be provided on the other side to ensure releasability when the sheet is unwound from a roll. In addition to protection performance, the surface protection sheet is required to have uniform adhesion on the surface, peelability, staining after peeling, and the like. Contamin...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information
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