Patent · US Expired

Mixtures of nematic liquid crystal materials

US4090975A · kind A · utility

6Cited by

12References

1Claims

0Family size

Assignee

I-TEK, Inc. · US

Inventors

Ralph E. Aldrich · Acton, US
William J. Cumming · North Chelmsford, US
William A. Simmons · Windsor, US

Key dates

Filing date	Jun 28, 1976
Grant date	May 23, 1978
Priority date	—
Expiry date	Jun 28, 1996

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC09K19/48
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

Liquid crystal mixtures are disclosed which contain 30-60% of a Schiff's base nematic liquid crystal compound, 25-65% of a second nematic liquid crystal compound selected from the classes of azoxy, ester and biphenyl, and 5-15% of a triphenyl compound to raise the isotropic transition temperature. This combination results in liquid crystal compositions having unexpectedly wide nematic temperature ranges.

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