Polymerizable liquid crystal compound, liquid crystal...

Details Polymerizable liquid crystal compound, liquid crystal... Polymerizable liquid crystal compound, liquid crystal...

2008-04-17

2009-11-17

Wu, Shean C (Department: 1795)

Stock material or miscellaneous articles

Liquid crystal optical display having layer of specified...

C428S001310, C252S299010, C252S299630, C252S299640, C252S299650, C252S299660, C252S299670, C526S320000, C349S117000, C349S201000, C560S059000, C560S061000, C560S062000, C560S064000, C560S065000

Reexamination Certificate

active

07618690

ABSTRACT:
A liquid crystal compound represented by the formulain-line-formulae description="In-line Formulae" end="lead"?CH2═CR1—COO-(L)k-E1-E2-E3-E4-R2in-line-formulae description="In-line Formulae" end="tail"?wherein R1: a hydrogen atom or a methyl group; R2: a C1-8alkyl group; k: 0 or 1; L: —(CH2)pO— or —(CH2)q— (wherein each of p and q which are independent of each other, is an integer of from 2 to 8); E1: a 1,4-phenylene group; E2, E3, E4: each independently a 1,4-phenylene group or a trans-1,4-cyclohexylene group and at least one of E2and E3is a trans-1,4-cyclohexylene group, provided that the 1,4-phenylene group and trans-1,4-cyclohexylene group in E1to E4,may be such that a hydrogen atom bonded to a carbon atom in each group may be substituted by a fluorine atom, a chlorine atom or a methyl group. To provide a novel liquid crystal compound for preparing an optical element which can exhibit a proper Rd value depending upon usable wavelength and application and which is excellent in durability against a blue laser beam.

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