Patent · US Expired

Use of fluorinated aromatic polyamides as orientation layer for liquid-crystal switching and display devices

US5331081A · kind A · utility

3Cited by

3References

10Claims

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	Apr 21, 1992
Grant date	Jul 19, 1994
Priority date	—
Expiry date	Apr 21, 2012

Classification

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

Abstract

Use of fluorinated aromatic polyamides as orientation layer for liquid crystal switching and display devices Use of substituted aromatic polyamides as orientation layer in liquid crystal switching and display elements is described, in which the polyamides contain structural units of the formula (I) ##STR1## in which in formula I the symbols have the following meaning: ##STR2## in which R.sup.1 and R.sup.2 are identical or different and are perfluorinated alkyl having 1 to 4 carbon atoms, R.sup.3 and R.sup.4 are identical or different and are H or CF.sub.3, and in which --W-- is, for example, --O--, --C(CH.sub.3).sub.2 --, --C(CF.sub.3).sub.2 --. Orientation layers made of these polyamides can be cured at low temperatures, have good adhesion and high transmittance and allow for a high surface tilt angle.

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