Linear and cyclic polymers or oligomers having a photoreactive ethene group

US5539074A · kind A · utility

Assignee

• Hoffmann-La Roche Inc. · US

Inventors

• Rolf-Peter Herr · Glückstadt, DE
• Stephen Kelly · Möhlin, CH
• Martin Schadt · Seltisberg, CH
• Klaus Schmitt · Lörrach, DE
• Andreas Schuster · Annaberg-Buchholz, DE

Key dates

• Filing date: Feb 4, 1994
• Grant date: Jul 23, 1996
• Expiry date: Feb 4, 2014

Classification

• Technology area (CPC G): Physics
• CPC primary: G02F1/133788
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention is concerned with linear and cyclic polymers or oligomers having a photoreactive ethene group. The polymers are of the formula ##STR1## wherein M.sub.a, M.sub.b, M.sub.c are monomer units for homo- or copolymers; PA1 x, y, z are mole fractions of the copolymers, whereby in each case 0<x.ltoreq.1; 0.ltoreq.y.ltoreq.1 and 0.ltoreq.z<1; PA1 S.sub.a, S.sub.b are spacer units; PA1 Z.sub.a, Z.sub.b are molecule units which can undergo photochemical isomerization/dimerization; PA1 n is a magnitude of 4-100 000 and PA1 m is 0 or 1, The compounds are used as an orientating layer for liquid crystals.