Production of closed-celled foams of high compressive strength

摘要

Closed-celled foams of high compressive strength are obtained by extruding a mixture of a styrene polymer and from 8 to 16% by weight of a blowing agent mixture containing from 2 to 20% by weight of ethyl chloride, from 2 to 20% by weight of carbon dioxide, from 20 to 80% by weight of dichlorodifluoromethane and from 10 to 60% by weight of monochlorodifluoromethane.