Patent ID: 6613172
Filing Date: 2003-09-02
Classification: B29C,B32B

Abstract:
A process for producing a foamable composite polyolefin resin sheet, which comprises the steps of:reacting a polyolefin resin with 0.2 to 2 parts by weight per 100 parts by weight of the polyolefin resin of a modifying monomer to form a modified resin, the modifying monomer being a non-silane compound, having two or more functional groups which can undergo radical reaction, selected from the group consisting of a dioxime compound, a bismaleimide compound, divinylbenzene, an allylic polyfunctional monomer, a (meth)acrylic polyfunctional monomer and a quinine compound or a mixture thereof; blending with the obtained modified resin 50 to 200 parts by weight of an unmodified resin for every 100 parts by weight of the obtained modified resin; adding a thermally decomposable chemical foaming agent to the obtained modified resin blended with the unmodified resin to obtain a mixture; kneading the obtained mixture to obtain a foamable resin composition; shaping the obtained foamable resin composition into a foamable sheet; and laminating a plane of facing material on at least one side of the obtained foamable sheet, the facing material having a strength sufficient to inhibit the foamable sheet from expanding in in-plane directions during subsequent foaming by heating the foamable sheet.