Patent · US Expired

Polyimide alignment film from 2,2-BIS (3,4-dicarboxyphenyl)--hexafluoropropane dianhydride and ortho-substituted aromatic diamines for active matrix liquid crystal displays

US5759442A · kind A · utility

12Cited by

3References

16Claims

0Family size

Assignees

E.I. DU PONT DE NEMOURS AND COMPANY · US
Merck Patent GmbH · DE

Inventors

Brian C. Auman · Avondale, US
Edgar Bohm · Clausthal-Zellerfeld, DE
Bernd Fiebranz · Munster, DE

Key dates

Filing date	Mar 7, 1997
Grant date	Jun 2, 1998
Priority date	—
Expiry date	Mar 7, 2017

Classification

Technology area (CPC G)Physics
CPC primaryG02F1/133723
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A polyimide alignment film based on 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride and ortho-substituted aromatic diamines, such as 2,3,5,6-tetramethyl-p-phenylene diamine, 2,4,6-trimethyl-m-phenylene diamine and 1,5-diaminonaphthalene, providing high voltage holding ratio and high tilt angle when used in active matrix liquid crystal displays.

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