The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 26, 1989
Filed:
Dec. 23, 1988
Warren B Mueller, Baton Rouge, LA (US);
Susan D Landry, Baton Rouge, LA (US);
Ethyl Corporation, Baton Rouge, LA (US);
Abstract
Low density rigid foamed polyphosphazene articles having excellent physical and flammability properties are made by masticating a mixture of high molecular weight linear polyphosphazene, a curing agent (e.g., sulfur), an accelerator, a blowing agent and optionally fillers, processing aids and the like to form a substantially homogeneous blend and then stopping the masticating, heating to pre-cure and then heating to activate the blowing agent and complete the cure thereby forming a flexible foamed polyphosphazene composite, 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.