Patent · US Expired

Polyimide film from pyromellitic dianhydride and a bis(4-aminophenoxy) aromatic compound as an alignment layer for liquid crystal displays

US5731404A · kind A · utility

8Cited by

3References

10Claims

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

Key dates

Filing date	Nov 1, 1995
Grant date	Mar 24, 1998
Priority date	—
Expiry date	Nov 1, 2015

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/31721
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A polyimide alignment film based on pyromellitic dianhydride and a bis(4-aminophenoxy) aromatic compound, such as 1,3-bis(4-aminophenoxy)benzene or 1,4-bis(4-aminophenoxy)benzene, providing low tilt angles of from to 2 degrees when used in liquid crystal displays.

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