(2'-Cyano-4'-n-alkyl)phenyl-3-chloro-4-n-alkoxy benzoates and li

Details (2'-Cyano-4'-n-alkyl)phenyl-3-chloro-4-n-alkoxy benzoates and li (2'-Cyano-4'-n-alkyl)phenyl-3-chloro-4-n-alkoxy benzoates and li

1980-01-23

1981-07-21

Torrence, Dolph H.

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

260465D, 350350R, 25229964, 25229965, 25229967, C07C12175, C09K 334, G02F 113

Patent

active

042797713

ABSTRACT:
A new ester compound suitable for use in a liquid crystal composition is provided. The compound is a (2'-cyano-4'-alkyl)phenyl-3-chloro-4 alkoxybenzoate represented by the following formula: ##STR1## wherein R and R' are selected from straight-chain alkyl groups having from one to eight carbon atoms. The ester is not a liquid crystal compound, but upon addition to a liquid crystal composition increases the absolute value of the dielectric anisotropy in the high frequency range. Such compositions are particularly well suited for the two frequency matrix-addressing drive in a liquid crystal display for complex character and graphic displays. The esters are prepared by condensing an acid chloride having the general formula ##STR2## and a phenol having the general formula ##STR3## wherein R and R' are as defined above.

REFERENCES:
patent: 4110243 (1978-08-01), Albert-Mellah et al.
patent: 4195916 (1980-04-01), Coates et al.
patent: 4198312 (1980-04-01), Sato et al.

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