Benzene derivative, liquid crystal composition and liquid...

Details Benzene derivative, liquid crystal composition and liquid... Benzene derivative, liquid crystal composition and liquid...

2005-03-29

2010-11-23

Wu, Shean C (Department: 1795)

Stock material or miscellaneous articles

Liquid crystal optical display having layer of specified...

C252S299610, C252S299630, C252S299660, C252S299670, C549S380000, C570S127000, C570S128000, C570S129000

Reexamination Certificate

active

07838087

ABSTRACT:
Known compounds showing negative dielectric anisotropy show negative dielectric anisotropy of relatively large values but are not satisfactory in view of the balance of the physical property as the liquid crystal material such as having low clearing point and showing high viscosity. The present invention intends to provide a liquid crystalline compound showing a negative dielectric anisotropy, as well as having excellent balance for physical property such as having relatively high clearing point, relatively low viscosity, appropriate optical anisotropy, and excellent compatibility with other liquid crystalline compounds.The compound of the invention is a compound represented by Formula (1) or Formula (2). In the formulae, Ra and Rb each independently is hydrogen or alkyl of 1 to 20 carbon atoms, A1, A11, A12, A2, A21and A22each independently is a cyclic group, Y, W, Z11, Z12, Z2, Z21and Z22each independently is a bonding group, and j, k, m, n, p and q each independently is 0 or 1 and the sum of them is 1, 2 or 3;

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Pamphlet of WO 0039063, Jul. 6, 2000.
Peer Kirsch et al., “Nematic Liquid Crystals with Negative Dielectric Anisotropy: Molecular Design and Synthesis”, Synlett, No. 4, ISSN: 0936-5214, pp. 389-396, 1999.
Peer Kirsch et al., “Nematic Liquid Crystals for Active Matrix Displays: Molecular Design and Synthesis”, Angew. Chem. Int. Ed., 39, pp. 4216-4235, 2000.

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