Importance

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Abstract

A reinforcing sheet for a resin molded article includes a constraining layer and a reinforcing layer laminated on the constraining layer to be then heated at 80° C. or more to bring the reinforcing sheet into close contact with the resin molded article. The constraining layer may be formed from at least one of a glass cloth, a resin impregnated glass cloth, a non-woven fabric, a metal foil, a carbon fiber or a polyester film. The reinforcing layer is formed of an adhesive composition containing styrene-ethylene-butylene-styrene copolymer or styrene-ethylene-propylene-styrene copolymer, a tackifier and a filler. When the reinforcing sheet is attached to a polypropylene plate having a thickness of 2.0 mm and is heated at 80° C. for 10 minutes, the bending strength at a displacement of 1 mm of the resulting sheet after the heating is 3N or more and the maximum bending strength thereof is 30N or more, and a high-temperature adhesion retention ratio R is 80% or more, wherein R=(Adhesive force A_1000h after heating at 100° C. for 1000 hours/Adhesive force A_1h after heating at 100° C. for 1 hour)×100.

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First Claim