Rigid polyphosphazene foam and process for making same

Details Rigid polyphosphazene foam and process for making same Rigid polyphosphazene foam and process for making same

C - Chemistry, Metallurgy

08

J

403/9, 18/979

C08J 9/04 (2006.01) C08J 9/06 (2006.01)

Patent

CA 2004152

RIGID POLYPHOSPHAZENE FOAM AND PROCESS FOR MAKING SAME Abstract of the Disclosure Low density rigid foamed polyphosphazene articles having excellent physical and flammability properties are made by masticating a mixture of high molecular weight weight linear polyphosphazene, a curing agent (e.g., sul- fur), an accelerator, a blowing agent and optionally fillers, processing aids and the like to form a substan- tially homogeneous blend and then stopping the masticat- ing, heating to pre-cure and then heating to activate the blowing agent and complete the cure thereby forming a flexible foamed polyphosphazene composition, forming the flexible foamed polyphosphazene composition into a shaped composition, and thereafter heating the flexible foamed shaped polyphosphazene composition at a temperature and for a length of time which causes the flexible foamed polyphosphazene composition to become a rigid foamed polyphosphazene composition of the same shape as the flexible foamed polyphosphazene composition.

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