Pyrimidine derivatives and liquid crystal compositions including

Details Pyrimidine derivatives and liquid crystal compositions including Pyrimidine derivatives and liquid crystal compositions including

1992-04-15

1993-04-06

Stoll, Robert L.

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

544242, 558418, C09K 1934, C07C27700, C07C25500

Patent

active

052001105

ABSTRACT:
2-phenyl-5-(4'-trans-cyclohexyl) phenyl pyrimidine derivatives represented by the general formula: ##STR1## wherein R is a straight chain alkyl group having 1 to 10 carbon atoms; X is CN or F; Y is F or H; Z is F or H; and when X is F, at least one of Y and Z is H; and the cyclohexane ring is a trans isomer, exhibiting a nematic phase and having a high nematic phase-isotropic liquid phase transition temperature (N-I Point) and large positive dielectric constant anisotropy (.DELTA..epsilon.). The pyrimidine derivatives may be included in liquid crystal compositions for improved display devices having a wide temperature range, including a high N-I point, a low threshold voltage and a low driving voltage.

REFERENCES:
patent: 4713197 (1987-12-01), Eidenschink et al.
patent: 4818428 (1989-04-01), Scheuble et al.
patent: 4834904 (1989-05-01), Krause et al.
patent: 4883609 (1989-11-01), Yamada
patent: 5030382 (1991-07-01), Yamada

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