Cushioning material for hot pressing and process for producing the same

摘要

In order to prevent any surface swelling, resulting from bleeding of a low molecular weight compounding agent contained in rubber, a cushioning pad for hot pressing has a rubber sheet 1, and a surface layer material 2 made of a porous heat-resistant resin film laminated on at least one face of rubber sheet 1. The porous film has an average pore diameter of 10 mu m or less and the porous film has gas permeability of 0.1 cm3/cm2.sec or more.