Swallow-tailed compound and ferrielectric liquid crystal composi

Details Swallow-tailed compound and ferrielectric liquid crystal composi Swallow-tailed compound and ferrielectric liquid crystal composi

1997-09-11

1999-08-17

Kelly, C. H.

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

25229967, 25229966, 560 65, 560 67, 560 73, C09K 1912, C09K 1920, C07C 6976

Patent

active

059389737

ABSTRACT:
A swallow-tailed compound of the following general formula (1), ##STR1## wherein m is an integer of 4 to 10, n is an integer of 2 to 6, p is 0 or 1 and each of X and Y is independently a hydrogen or fluorine atom; and a ferrielectric liquid crystal composition consisting essentially of the swallow-tailed compound of the general formula (1) and a ferrielectric liquid crystal compound of the following general formula (2), ##STR2## wherein R is a linear alkyl group having 6 to 12 carbon atoms, Z is a hydrogen or fluorine atom, r is an integer of 2 to 4 and s is an integer of 2 to 4. The ferrielectric liquid crystal composition has a ferrielectric phase in a broad temperature range and attains a fast response and a large tilt angle in a broad temperature range so that a ferrielectric liquid crystal display device having high display qualities can be provided.

REFERENCES:
patent: 5534190 (1996-07-01), Johno et al.
patent: 5660762 (1997-08-01), Ito et al.
Booth, et al., "The Ferro-, Ferri-And Antiferro-electric Properties of a Series of Novel 2-or 3-substituted-alkyl 4'-(4-dodecyloxybiphenyl-4-carbonyloxy)-benzoate esters", Liquid Crystals, 1996, vol. 20, No. 6, pp. 815-823.
Heinemann, et al., "Competition Between Dipolar and Steric Interactions In Swallow-Tailed Compounds", Liquid Crystals, 1993, vol. 13, No. 3, pp. 373-380.
Nito, et al., "TFT-driven Monstable Ferroelectric Liquid Crystal Display with Wide Viewing Angle and Fast Response Times", SIDS 1994 Preprint pp. 48-51.
Gorecka, et al. "Molecular Orientational Structures in Ferroelectric, Ferrielectric and Antiferroelectric Smectic Liquid Crystal Phases as Studied by Conoscope Observation", Jap. Journal of Appl. Physics, vol. 29, No. 1, Jan. 1990, pp. 131-137.
Nakagawa, M., "A Hysterisis Model for Antiferroelectric SmC*.sub.A Phases", Jap. Journal of Appl. Physics, vol. 30, No 8, Aug. 1991 , pp. 1759-1764.
Okabe, et al., "Reentrant Antiferroelectric Phase in 4-(1-Methylheptyloxy-carbonyl) phenyl-4'-Octylbiphenyl-4-Carboxylate", Jap. Journal of Appl. Physics, vol. 31 (1992), pp. L793-L796 (Part 2, No. 6B, Jun. 15, 1992).
Neubert et al., Mol. Crys. Liq. Crys., 1993, vol. 237 pp. 47-68. 1993.

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