Polymerizable liquid crystal compound, liquid crystal...

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Reexamination Certificate

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C252S299620, C252S299670, C526S318100, C526S318200, C558S271000, C560S080000, C560S081000, C560S139000

Reexamination Certificate

active

07985455

ABSTRACT:
The compound of the present invention is represented by the formula (1). In the formula (1), R1and R2are hydrogen, fluorine, chlorine, methyl or ethyl; X1and X2are hydrogen, fluorine, methyl or trifluoromethyl; Z1and Z2are a single bond, —COO—, —OCO—, —CH═CH—COO—, —OCO—CH═CH—, —CH2CH2—COO—, —OCO—CH2CH2—, —CH2O—, —CONH—, —(CH2)4—, —CH2CH2— or —C≡C—; Z3and Z4are a single bond or —O—; A1and A2are 1,4-cyclohexylene, 1,4-phenylene, 1,3-phenylene, pyridin-2,5-diyl, pyrimidin-2,5-diyl, naphthalen-2,6-diyl or tetrahydronaphtlane-2,6-diyl; and Y1and Y2are alkylene having from 2 to 20 carbon atoms.

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