Liquid crystal compounds

Details Liquid crystal compounds Liquid crystal compounds

2008-07-08

2008-07-08

Oh, Taylor Victor (Department: 1625)

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

C252S299650, C252S299660, C349S182000, C560S084000, C560S086000

Reexamination Certificate

active

07396487

ABSTRACT:
A compound of formula (I): where R1is alkyl or alkenyl, Y1and Y2are independently selected from oxygen or sulphur, n is an integer of from 1 to 5, A is an optionally substituted phenyl or an optionally substituted cycloalkyl ring, X is a direct bond, a C1-4alkylene, a C2-4alkenylene, an acetylene, —CO(O)— or a group of sub-formula (i): where X1and X2are independently selected from a direct bond, a C1-4alkylene, a C2-4alkenylene, an acetylene, —CO(O)— and R2, R3and R4are independently selected from hydrogen, halo or cyano, provided that no more than one of R2, R3and R4is hydrogen. These compounds have a high dipole moment and may be used as dopants in liquid crystal mixtures.

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