Patent · US Expired

Substituted aromatic polyamides as orientation layers for liquid crystal display elements and liquid crystal switching elements

US5196501A · kind A · utility

2Cited by

5References

8Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Hans-Rolf Dubal · Königstein, DE
Mikio Murakami · Kakegawa, JP
Otto Herrmann-Schonherr · Bensheim, DE
Arnold Schneller · Mainz, DE

Key dates

Filing date	Dec 17, 1991
Grant date	Mar 23, 1993
Priority date	—
Expiry date	Dec 17, 2011

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/31725
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

Preparation of specially substituted aromatic polyamides containing structural units of the formula I mentioned and copolyamides containing at least 10 mol % of structural units of the formula I and structural units of the formula II mentioned and their use as orientation layer in liquid crystal display elements and/or liquid crystal switching elements.

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