Compositions – Liquid crystal compositions
Patent
1995-10-12
1997-08-19
Kelly, C. H.
Compositions
Liquid crystal compositions
2522996, 25229961, 25229966, 25229962, 252 2963, 25229965, 25229967, C09K 1906, C09K 1934, C09K 1912, C09K 1932
Patent
active
056584911
ABSTRACT:
A process for controlling the cone tilt angle of a tilted smectic liquid crystal composition comprises the step of combining (a) at least one liquid crystal composition comprising at least one smectic or latent smectic liquid crystal compound comprising (i) an aliphatic fluorocarbon terminal portion comprising a terminal fluoroalkyl or fluoroether group and an alkylene group having at least two carbon atoms and containing at least one catenary ether oxygen atom, (ii) an aliphatic hydrocarbon terminal portion, and (iii) a central core connecting the terminal portions; and (b) at least one liquid crystal composition comprising at least one smectic or latent smectic liquid crystal compound; with the provisos that at least one of the compositions (a) and (b) comprises at least one chiral liquid crystal compound and that the combining of compositions (a) and (b) provides an optically active, tilted chiral smectic liquid crystal composition. The process enables control of cone tilt angle and thereby control of the brightness characteristics of liquid crystal display devices.
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Kistner John F.
Radcliffe Marc D.
Savu Patricia M.
Snustad Daniel C.
Griswold Gary L.
Kelly C. H.
Kirn Walter N.
Minnesota Mining and Manufacturing Company
Weiss Lucy C.
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