PROCESS FOR PRODUCING FOAMABLE COMPOSITE POLYOLEFIN RESIN SHEET AND COMPOSITE FOAM

摘要

A composite foam having a high compression strength. A polyolefin resin is melt mixed with a modifying monomer to react them. A thermally decomposable chemical foaming agent is added to the resultant modified resin and the mixture is kneaded. The resultant foamable resin composition is shaped into a sheet. The foamable sheet obtained is laminated on at least one side to a sheet (3) having a strength sufficient to inhibit the foamable sheet from expanding in the in-plane directions during foaming by heating. The resultant foamable composite sheet is thermally foamed to produce a composite foam (1) having rugby-ball-shaped cells (2) oriented in the direction of the sheet thickness.