Patent · US Expired

Wholly aromatic polyamide, process for preparing same and structure thereof.

US4987215A · kind A · utility

12Cited by

11References

12Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Gunter Keil
Karl Heinrich · Großaitingen, DE
Peter Klein · Burns Lake, CA

Key dates

Filing date	Oct 16, 1989
Grant date	Jan 22, 1991
Priority date	—
Expiry date	Oct 16, 2009

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G69/32
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

Aromatic copolyamides, soluble in organic polyamide solvents, comprise at least 95 mol % of the recurrent structural units of the formulae ##STR1## and up to 5 mol % of structural units containing m-bonds. Here --Ar--is a divalent, unsubstituted or substituted aromatic radical, the valency bonds of which are in the para-position or in a comparable coaxial or parallel position, and --R--and --R' are different from one another and are lower alkyl radicals or lower alkoxy radicals.

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