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:
Nov. 15, 1994
Filed:
Dec. 01, 1993
David A Babb, Lake Jackson, TX (US);
W Frank Richey, Lake Jackson, TX (US);
Katherine S Clement, Lake Jackson, TX (US);
Bobby R Ezzell, Midland, MI (US);
The Dow Chemical Company, Midland, MI (US);
Abstract
A process for preparing a polymer having perfluorocyclobutane rings by the steps of (a) contacting monomers having aromatic polyester, aromatic polyamide, or polyimide groups or combination thereof, at least two dimerizable perfluorovinyl groups; and (b) exposing the monomers to sufficient heat and for a sufficient time that a polymer containing perfluorocyclobutane rings is formed. Chain extending oligomers of polymers having poor processing characteristics by this process results in polymers which are more easily processed. For instance, perfluorocyclobutane groups formed in an extruder to chain lengthen polyimide oligomers, in effect, render polyimides extrudable. The polymer formed by the method preferably has polyimide groups. New monomers and polymers having imide and perfluorovinyl or perfluorocyclobutane structures, respectively, are prepared.