Compositions – Liquid crystal compositions
Reexamination Certificate
2007-02-14
2010-06-22
Visconti, Geraldina (Department: 1795)
Compositions
Liquid crystal compositions
C252S299600, C252S299630, C252S299640, C252S299650, C252S299660, C430S020000, C428S001100, C349S001000
Reexamination Certificate
active
07740769
ABSTRACT:
The invention is to provide such a liquid crystal compound that has general properties required for a liquid crystal compound, stability to heat, light and the like, a small viscosity, a suitable optical anisotropy, a negatively large dielectric anisotropy, a wide temperature range of a nematic phase, and favorable compatibility with other liquid crystal compounds, and a liquid crystal composition containing the compound. The invention provides a compound represented by Formula (1), wherein Ra and Rb are hydrogen or an alkyl having 1 to 20 carbon atoms; ring A1is 1,4-cyclohexylene, 1,4-phenylene, pyridine-2,5-diyl, pyridazine-3,6-diyl, decahydronaphthalene-2,6-diyl, 1,2,3,4-tetrahydronaphthalene-2,6-diyl, 5,6,7,8-tetrahydronaphthalene-2,6-diyl, or naphthalene-2,6-diyl; Z1is a single bond or an alkylene having 1 to 4 carbon atoms; Y1is hydrogen, halogen, —CN, —CF3, —CHF2, —CH2F, —OCF3, —OCHF2, or —OCH2F; and m is 1, 2, or 3.
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Russell A. Lewthwaite et al., “The effect of a lateral hydroxy substituent on the thermal stability of the chiral smectic C phase”, Liquid Crystals, vol. 16, No. 2, pp. 299-313, XP0000420702, ISSN 0267-8292, 1994.
Chisso Corporation
Chisso Petrochemical Corporation
Visconti Geraldina
Wenderoth , Lind & Ponack, L.L.P.
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