Polymers prepared from 4,4'-bis(3,4-dicarboxyphenyl) hexafluoroi

Details Polymers prepared from 4,4'-bis(3,4-dicarboxyphenyl) hexafluoroi Polymers prepared from 4,4'-bis(3,4-dicarboxyphenyl) hexafluoroi

Filed on

1990-08-06

Date issued

1991-10-29

Examiner

Kight, III, John

Patent Class

Synthetic resins or natural rubbers -- part of the class 520 ser

SubClass

Synthetic resins

SubSubClass

From carboxylic acid or derivative thereof

Other Related Categories

528363, 528401, 528486, C08G 7310

Type

Patent

Status

active

Patent number

050617842

Description

ABSTRACT:
Polyimides and polyamide-acids having improved solubility and processing characteristics and high glass transition temperatures are provided, having incorporated into the polymeric chain the novel aromatic dianhydride compound 4,4'-bis[2-(3,4-dicarboxyphenyl) hexafluoroisopropyl] diphenyl dianhydride. The polyamide-acids and polyimides are prepared by reacting the 12F-Diphenyl DA with aromatic or aliphatic diamines. It has been found that the polyimides of this invention have improved solubility characteristics, good dielectric properties while at the same time exhibiting relatively high glass transition temperatures, and superior thermal and thermo-oxidative stability. The polymers may be processed into films, fibers or compression molded or fabricated into composites at moderate temperatures and pressures.

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