Nichiban Company Limited

Yoshinaga Tsuzuki

Syuji Ichimura

Kinnosuke Hino

Kazuhiro Kono

Mikihiro Endo

The pressure-sensitive adhesive sheet for surface protection has a three-layered film formed by laminating a layer A, a layer B and a layer C in this order and a pressure-sensitive adhesive layer formed on the layer C; wherein the layer A contains a polyethylene in an amount of at least 60% by weight based on a total weight of the layer A; the layer B contains a polypropylene type polymer in an amount of at least 50% by weight of based on a total weight of the layer B; and the layer C contains a hydrogenated styrene/diene type hydrocarbon copolymer in an amount of at least 10% by weight based on the total weight of the layer C. This sheet has excellent weathering resistance to undergo neither chalking nor fracture in the substrate at peeling, even after a prolonged outdoor exposure, develops less corona odor to enable extended operation of applying it, and can be manufactured inexpensively with reduced manufacturing process, since no anchor coat treating procedure is required.

Surface-protective pressure-sensitive adhesive sheet

The present invention is to provide a pressure-sensitive adhesive sheet for surface protection, which has a substrate containing an ethylene/propylene copolymer and an ethylene/1-butene copolymer in a weight ratio of 60:40 to 90:10, and an adhesive composition for pressure-sensitive adhesive sheets for surface protection, which contains 5 to 30 parts by weight of a rosin resin tackifier based on 100 parts by weight of a blend comprising 50 to 100% by weight of a polyisobutylene and/or a butyl rubber and 50 to 0% by weight of a polybutene.

Surface-protective pressure-sensitive adhesive sheet and pressure-sensitive adhesive composition for surface-protective pressure-sensitive adhesive sheet

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Tokyo, Japan

Yoshinaga Tsuzuki