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:
Dec. 30, 1980
Filed:
Apr. 19, 1979
Tai C Cheng, Akron, OH (US);
John R Schreffler, Clinton, OH (US);
The Firestone Tire & Rubber Company, Akron, OH (US);
Abstract
A method of producing substantially pure polyhalophenoxyphosphazene homopolymers or copolymers which are free from phenoxy groups formed by reduction of halophenols is provided. The method involves as a first step preparing a substantially pure sodium salt of a halogen-substituted phenol (in the case of homopolymers) or the substantially pure sodium salts of a mixture of a halogen-substituted phenol and an alkyl or alkoxy-substituted phenol, alkanol, or fluoroalkanol (in the case of copolymers) by reacting said halogen-substituted phenol or mixture with sodium hydride. Following this procedure, the resultant sodium salt or salts are reacted with a poly(dichlorophosphazene) of the formula (NPCl.sub.2).sub.n, in which n is from 20 to 50,000, to produce a mixture of polyhalophenoxyphosphazene homopolymer or copolymer and sodium chloride. The sodium chloride is then separated from the mixture to produce a substantially pure polyhalophenoxyphosphazene homopolymer or copolymer which is free from phenoxy groups.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile