Fully aromatic copolyamide from 4,4'-diamino benzanilide

US5097015A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Georg-Emerich Miess · Regensburg, DE
• Peter Klein · Burns Lake, CA

Key dates

• Filing date: Oct 23, 1990
• Grant date: Mar 17, 1992
• Expiry date: Oct 23, 2010

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G69/36
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Aromatic copolyamides are described which are soluble in organic polyamide solvents and contain at least 95 mol % of repeating structural units of the formulae ##STR1## and up to 5 mol % of structural units E and/or F containing m-bonds and being derived from aromatic dicarboxylic acids (E') and/or aromatic diamines (F'), the sums of the molar proportions of structural units A+E and the molar proportions of structural units B+C+D+F being essentially the same. In these formulae, --Ar-- is a divalent aromatic radical whose valence bonds are in the para or comparable coaxial or parallel position, --R is hydrogen, lower alkyl radicals, lower alkoxy radicals or halogen, and R' is a direct bond, a polymethylene chain of 2 to 6 carbon atoms, --O--, --S--, --CO-- or --SO.sub.2 --, or a group of the formula --O--Ar'--O--, in which Ar' has the same meanings as Ar. The proportions of the diamine structural units B, C and D, relative to the total amount of these diamine structural units, are within the following limits: ______________________________________ structural unit B: 5-60 mol %, structural unit C: 10-80 mol %, structural unit D: 10-85 mol %. ______________________________________