Liquid crystalline copolymer

US4943617A · kind A · utility

Assignee

• BASF SE

Inventors

• Karl-Heinz Etzbach · Bischofswerda, DE
• Bernd Hisgen · Schifferstadt, DE

Key dates

• Filing date: Sep 1, 1987
• Grant date: Jul 24, 1990
• Expiry date: Sep 1, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K19/408
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A liquid crystalline copolymer contains a comonomer to which a radical ##STR1## is bonded, where X is a chemical bond, O or NR.sup.1, Y is a chemical bond or --CO--, R.sup.1 is hydrogen or C.sub.1 -C.sub.4 -alkyl and A is a linear or branched C.sub.2 -C.sub.20 -alkylene group which may be interrupted by --O-- or ##STR2## The liquid crystalline copolymers have very good lightfastness, high dichroism and a high absorption.