Alkenyl cyclohexane derivatives and liquid crystal compositions

Details Alkenyl cyclohexane derivatives and liquid crystal compositions Alkenyl cyclohexane derivatives and liquid crystal compositions

1996-05-31

1998-01-20

Wu, Shean C.

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

25229963, 25229901, 549357, 549369, 549377, C09K 1934, C09K 1930, C07D31906

Patent

active

057098204

ABSTRACT:
Liquid crystalline alkenyl cyclohexane compounds of formula (I) having a nematic phase over a broad temperature range, a higher elastic constant ratio K.sub.33 /K.sub.11 and a lower viscosity, liquid crystal compositions comprising the above compounds and liquid crystal display elements using the liquid crystal compositions. ##STR1## wherein R.sub.1 is an alkyl group of 1-15 carbons, an alkenyl group of 2-15 carbons or an alkyl or alkenyl group in which at least one of non-adjacent methylene groups (--CH.sub.2 --) is replaced by --O--, --S--, --C.tbd.C-- or --COO--; R.sub.2 is a hydrogen atom or an alkyl group of 1-10 carbons; m is 0-5; when m is 2 or more, any one methylene group in --(CH.sub.2).sub.m -- may be replaced by --O--; and the rings A.sub.1, A.sub.2 and A.sub.3 are independently a 1,4-cyclohexylene, a cyclohexene-1,4-diyl or a 6-membered ring group, one or two --CH.sub.2 -- groups in said rings optionally replaced by --O-- or --S--.

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Journal De Physique, Suppl. No. 3, 36, p. C1-379-383, Mar. 1975, "Liquid Crystals With Hydroaromatic And Hydroheterocyclic Structures;" H. Schubert, et al.
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