Liquid crystal compounds

Details Liquid crystal compounds Liquid crystal compounds

1992-05-28

1995-07-18

Tucker, Philip

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

25229967, 560 60, 560 73, C09K 1920, C07C 6976

Patent

active

054338875

ABSTRACT:
The invention discloses optically active liquid crystal compounds represented by the formulas [I], [II] and [III]: ##STR1## wherein R.sub.1 and R.sub.2 each represents an alkyl group of 4-18 carbon atoms, X represents O, COO or a single bond, and (A), (B), (C), (D) and (E) each represents ##STR2## in which l represents a halogen. The invention further discloses optically active liquid crystal compounds which are able to exhibit tristable states, represented by the formulas [IV], [V] and [VI]: ##STR3## wherein R.sub.1 ' and R.sub.2 ' each represents a straight chain alkyl group of 5-16 carbon atoms, X' represents O or COO and (A), (B), (C), (D) and (E), and l each has the same meaning as above.

REFERENCES:
patent: 4918213 (1990-04-01), Nohira et al.
patent: 4921632 (1990-05-01), Nakamura et al.
patent: 5184847 (1993-02-01), Suzuki et al.
patent: 5204020 (1993-04-01), Suzuki et al.
patent: 5207946 (1993-05-01), Numazawa et al.
patent: 5207947 (1993-05-01), Suzuki et al.
patent: 5211879 (1993-05-01), Shiratori et al.
Molecular Crystals and Liquid Crystals Incorporating Nonlinear Optics, vol. 174, Sep. 1989, pp. 89-99.
Patent Abstracts of Japan, vol. 13, No. 151 (C-584)[349], 12th Apr. 1989, p. 26 C 584.

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