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:
Apr. 27, 1982
Filed:
Aug. 04, 1980
John W Fieldhouse, Mogadore, OH (US);
Steven L Fenske, Uniontown, OH (US);
The Firestone Tire & Rubber Company, Akron, OH (US);
Abstract
Substantially linear polydichlorophosphazene polymers having a degree of polymerization of from 20 to 50,000 are prepared by an improved solution polymerization process which involves the polymerization of substantially pure cyclic dichlorophosphazene oligomers represented by the formula (NPC1.sub.2).sub.n, in which n is from 3 to 7, in cycloaliphatic solvents in the presence of a boron trihalide catalyst or a complex of a boron trihalide with an oxygenated phosphorus compound. The process provides for the production of substantially gel free linear polydichlorophosphazene polymer, improved polymerization rates and easier handling of the polymerizate for subsequent derivatization reactions.