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:
May. 05, 1992
Filed:
Apr. 24, 1990
Tai-Shung Chung, Randolph, NJ (US);
Rohitkumar H Vora, Westfield, NJ (US);
Hoechst Celanese Corp., Somerville, NJ (US);
Abstract
Novel polyimide blends are formed of polyimide polymers each having moieties derived from dianhydride and diamine comonomers. The blends of the present invention may be formed by selecting polyimide polymers having structurally identical dianhydride-derived moieties, but structurally different diamine-derived moieties. Preferred miscible blends are formed wherein one of polyimides in the blend is the polymer condensation product of a dianhydride selected from 2,2-bis(3,4-dicarboxyphenyl) hexafluoropropane dianhydride, 3,3',4,4'-diphenyl tetracarboxylic dianhydride, 3,3',4,4'-benzophenone tetracarboxylic dianhydride, bis(3,4-dicarboxyphenyl ether dianhydride, pyromellitic dianhydride, and mixtures thereof, and 2,2-bis(3-aminophenyl) hexafluoropropane, and another of the polyimides in the blend is the polymer condensation product of the same dianhydride and mixtures thereof noted above, and 2,2-bis(4-aminophenyl) hexafluoropropane.