METHOD OF PRODUCTION FOR FOAMED WEB FROM HIGHLY HEAT RESISTANT POLYSULFONE OR POLYETHER SULFONE

摘要

PPROBLEM TO BE SOLVED: To provide a method of production for foamed web utilizing a safe foam for use at high temperature. PSOLUTION: The invention provides a method producing the foamed web by carrying out a foaming extrusion of a mixture of a polysulfone or a polyether with a volatile foaming agent. The foaming agent used in the method comprises water, or a mixture of water and an organic liquid for example, an alcohol or a ketone. PCOPYRIGHT: (C)2003,JPO