Compositions – Liquid crystal compositions
Patent
1997-02-07
1999-01-12
Wu, Shean C.
Compositions
Liquid crystal compositions
25229961, 25229963, 25229964, 25229965, 25229966, C09K 1952, C09K 1934, C09K 1930
Patent
active
058582711
ABSTRACT:
Liquid crystal compositions are disclosed which satisfy various characteristics required of liquid crystal compositions used for TN-LCD or STN-LCD display mode, have a low viscosity to cope with the response at a high speed, have a high clearing point to cope with the change in environmental temperature, and have a small dependency of the pitch length on temperature. The liquid crystal compositions comprise, as a first component, at least one liquid crystalline 4-substituted-benzonitrile having a positive dielectric anisotropy, as a second component, at least one liquid crystalline compound having a small positive or negative dielectric anisotropy, and as chiral component A, at least one optically active compound expressed by general formula (X-a) or (X-b) ##STR1## wherein R.sup.0 represents an alkyl group or alkoxy group having 1 to 10 carbon atoms, X represents a halogen atom or CN, and Y represents an alkyl group having 1 to 10 carbon atoms or hydrogen atom.
REFERENCES:
patent: 4764619 (1988-08-01), Gunjima et al.
patent: 4904409 (1990-02-01), Miyazawa et al.
patent: 5076947 (1991-12-01), Kaneoya et al.
Isoyama Toyoshiro
Matsushita Tetsuya
Murashiro Katsuyuki
Nakagawa Etsuo
Sekiguchi Yasuko
Chisso Corporation
Wu Shean C.
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