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AssigneeNitto Denko Corporation
InventorsMitsuhiro Kanada, Keiji Hayashi, Ikkou Hanaki, Kooki Ooyama, Takayuki Yamamoto
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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.
A surface protection sheet, comprising a base material layer containing a thermoplastic resin, a pressure-sensitive adhesive layer provided on one side of the base material layer, and a backside treatment layer provided on another side of the base material layer and containing a polyethylene-based resin, wherein
A method for producing a surface protection sheet comprising a base material layer containing a thermoplastic resin, a pressure-sensitive adhesive layer provided on one side of the base material layer, and a backside treatment layer provided on another side of the base material layer and containing a polyethylene-based resin, comprising the step of integrally forming the base material layer, the pressure-sensitive adhesive layer and the backside treatment layer by co-extrusion, wherein
Dependencies are inferred from the claim text.