Liquid crystal composition

Details Liquid crystal composition Liquid crystal composition

1986-07-30

1988-10-25

Gron, Teddy S.

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

25229901, 25229963, 25229964, 25229965, 25229966, 25229967, 350350R, 350350S, C09K 1902, G02F 113

Patent

active

047802405

ABSTRACT:
A nematic liquid crystal composition having a notable increase of the twistability (i.e. the reciprocal of the intrinsic helical pitch) with temperature rise is provided, which composition comprises (i) optically active substance(s) which are the same in the helical twist sense to one another and make positive the temperature dependency of the twistability of the cholesteric phase induced when singly added to nematic compound(s), and (ii) nematic liquid crystal(s), which optically active substance(s) are a specified compound (I) containing a plurality of benzene, cyclohexane, dioxane, pyrimidine or/and pyridine ring and also having an optically active terminal group ##STR1## (R.sup.1 : alkyl); and further a nematic composition having a nearly constant twistability with temperature rise is provided, which composition comprises the above compound (I), optically active substance(s) which have the same helical twist sense as that of (I) and make negative the temperature dependency of the twistability of the induced cholesteric phase when singly added to nematic compound(s) and nematic liquid crystal(s), which latter optically active substance(s) are a specified compound (II) containing a plurality of benzene, cyclohexane dioxane, pyrimidine or/and pyridine group and having an optically active terminal group ##STR2## (W: a specified group, S: 0-4, and R.sup.5 : alkyl).

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