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:
Oct. 07, 1980
Filed:
Sep. 19, 1979
John W Fieldhouse, Mogadore, OH (US);
Daniel F Graves, Clinton, OH (US);
The Firestone Tire & Rubber Company, Akron, OH (US);
Abstract
Linear polydihalophosphazene polymers which are substantially free of gel are prepared by thermally polymerizing a cyclic polyhalophosphazene represented by the formula (NPX.sub.2).sub.3, wherein X is fluorine, chlorine or bromine in the presence of a catalyst which comprises the reaction product of a boron trihalide compound with an oxygenated phosphorus compound. In addition to producing substantially gel free polymers, the catalyst composition of the process of the invention permits improved control of molecular weight, lower polymerization temperature, high rates of conversion of (NPCl.sub.2).sub.3 to (NPCl.sub.2).sub.n and provides for more readily processible and derivatizable polymers.