Ethyl Corporation

Troy L Smith, Jr

Susan D Landry

Hugh A Fisher

An improved process for producing sulfur-cured polyphosphazene foams is disclosed. The process comprises foaming more than one storable, stable accelerator base composition comprising the sulfur curing agent, a phosphazene oil and a polyphosphazene. A masterbatch of the same or similar polyphosphazene is made by mixing together a hydrated filler, processing aids and phosphazene oil. The matchbatch and accelerator base composition are then blended and foamed and cured.

Phosphonitrilic polymers with curability by sulfur accelerated cures or

Silicon carbide production by pyrolysis of polycarbosilane polymers formed by prior art methods is fraught with defects. These can be obviated by utilizing as the polycarbosilane polymer, a poly(silmethylene) formed by polymerizing 1,3-disilacyclobutane with a ring-opening catalyst of a Group VIII element of atomic number 44 or above, preferably a Pt-containing catalyst, in an inert liquid medium and under an inert atmosphere. At pyrolysis temperatures of at least about 900.degree. C., silicon carbride in a crystalline state is formed. The poly(silmethylene) may be molded or shaped into various forms such as fibers before being subjected to the pyrolysis.

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Kennesaw, GA, United States of America

Troy L Smith, Jr