Compositions – Liquid crystal compositions – Containing nonsteryl liquid crystalline compound of...
Patent
1988-12-16
1992-04-28
Maples, John S.
Compositions
Liquid crystal compositions
Containing nonsteryl liquid crystalline compound of...
25229901, 25229963, 25229965, 25229966, C09K 1934, C09K 1952, C09K 1930, C09K 1912
Patent
active
051086514
ABSTRACT:
A ferroelectric liquid crystal composition having a negative large dielectric anisotropy value, AC stabilizing effect at low voltages and yet high-speed response properties, and a light switching element using the composition are provided, which composition comprises at least two components at least one of which is a compound expressed by the formula ##STR1## wherein R.sup.3 and R.sup.4 each represent the same or different linear or branched alkyl group of 1-18C and l is 1 or 2, and having a negative dielectric anisotropy value.
A preferred embodiment of the above composition contains at least three components A, B and C, one of which is the above compound of the formula (A) and components B and C of which are each selected from a group of specified compounds, and the respective proportions of components A, B and C being 5-50 weight %, 20-70 weight % and 5-40 weight % based on the total weight of the three, respectively.
REFERENCES:
patent: 4368135 (1983-01-01), Osman
patent: 4490015 (1984-12-01), Kawarada et al.
patent: 4780240 (1988-10-01), Emoto et al.
patent: 4780241 (1988-10-01), Furukawa et al.
patent: 4784792 (1988-11-01), Inoue et al.
patent: 4886620 (1989-12-01), Hopf et al.
Furukawa Kenji
Ichihashi Mitsuyoshi
Kikuchi Makoto
Takeshita Fusayuki
Terashima Kanetsugu
Chisso Corporation
Maples John S.
Tucker Philip
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