Patent · US Expired

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

US5856432A · kind A · utility

7Cited by

6References

7Claims

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 20, 1997
Grant date	Jan 5, 1999
Priority date	—
Expiry date	Nov 20, 2017

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 1 to 2 degrees when used in liquid crystal displays.

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