The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 15, 1994
Filed:
May. 12, 1992
Chisso Corporation, , JP;
Abstract
A ferroelectric liquid crystal composition is provided 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. An optical switching element comprising the ferroelectric liquid crystal composition is also provided. The ferroelectric liquid crystal composition comprises components A, B, C and D in respective amounts by weight of 75 to 95%, 3 to 9%, and 3 to 12% and 2 to 5% based on the total amount of these components and having a phase sequence series of an isotropic liquid, a cholesteric phase, a smectic A phase and a chiral smectic C phase in that order from the high temperature side and a spontaneous polarization value of 30 nC/cm.sup.2 or less. The component A is at least one compound selected from the group consisting of 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 formula: ##STR3## In the above formulae, R.sup.1 to R.sup.10, X, m, n and * are as defined in the claims.