Ferroelectric liquid crystal composition and light switching ele

Details Ferroelectric liquid crystal composition and light switching ele Ferroelectric liquid crystal composition and light switching ele

1990-04-05

1993-02-23

Stoll, Robert L.

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

25229966, 25229967, C09K 1934, C09K 1912, C09K 1920

Patent

active

051887614

ABSTRACT:
A ferroelectric liquid crystal composition, exhibiting an Sc* phase over a wide temperature range including room temperature and having a spontaneous polarization value of 30 nc/cm.sup.2 or less and a quick response time, is provided. An optical switching element, comprising the ferroelectric liquid crystal composition, is also provided. The ferroelectric liquid crystal composition comprises three components A, B and C in respective amount by weight of 75 to 95%, 3 to 9% and 3 to 12% based on the total amount of these components and having a phase sequence series of Iso-N*-Sa-Sc*. Component A is at least one compound selected from the group consisting of the compounds represented by the general formulae: ##STR1## The component B is at least one compound selected from the group consisting of compounds represented by the general formulae: ##STR2## The component C is at least one compound selected from the group consisting of compounds represented by the general formulae: ##STR3## In the above formulae, R.sup.1 to R.sup.10, X, m, n and * are as defined in the claims.

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patent: 4973426 (1990-11-01), Ohno et al.
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