Patent · US Expired

Heat-stable polyimides and polyamide-imides with modified benzhydrol structural elements and their preparation

US5378799A · kind A · utility

0Cited by

9References

6Claims

0Family size

Assignee

Chemie Linz GmbH · AT

Inventors

Gerhard Greber · Bischofshofen, AT
Heinrich Gruber · Wien, AT
Marcel Sychra · Bezirk Krems an der Donau (Stadt), AT

Key dates

Filing date	Sep 13, 1993
Grant date	Jan 3, 1995
Priority date	—
Expiry date	Sep 13, 2013

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G73/14
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

Heat-stable polyimides and polyamideimides with modified benzhydrol structural elements and a process of preparing thereof; wherein the polyimides and polyamideimides are obtained by reacting 3,3'4,4'-benzhydroltetracarboxylic acid dimethyl ester a) with only a diamine and then cyclized to give polyimides or b) with a diamine and with trimellitic, phthalic-or isophthalic acid (or the anhydrides, acid chlorides, anhydride chlorides or esters) and is then cyclized to give polyamideimides.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.