Ester compounds, liquid crystal composition including same and m

Details Ester compounds, liquid crystal composition including same and m Ester compounds, liquid crystal composition including same and m

1980-07-18

1982-07-27

Gron, Teddy S.

Compositions

Liquid crystal compositions

Containing nonchiral additive having no specified mesophase

25229962, 25229963, 25229964, 25229965, 25229966, 25229967, 260465D, 350350R, C09K 334, G02F 113, C07C12160, C07C12175

Patent

active

043416527

ABSTRACT:
Ester compounds suitable for use in liquid crystal compositions are provided. The ester compounds are (2'-chloro-4'-n-alkylphenyl)-3-cyano-4-n-alkoxybenzoates represented by the general formula: ##STR1## wherein R and R' are straight-chain alkyl groups having from one to eight carbon atoms. The ester compounds alone do not exhibit a liquid crystal phase, but have a relatively high value of dielectric anisotropy. Addition of minor amounts of at least one such ester compound to a liquid crystal composition lowers the value of the dielectric anisotropy of the composition in the high frequencies range. Such compositions are particularly well suited for the two-frequency matrix-addressing drive in a display of complex characters or graphic displays by reducing the driving voltage.
The ester compounds in accordance with the invention are prepared by condensing a 3-bromo-4-n-alkoxybenzoyl chloride having the general formula: ##STR2## and a 2-chloro-4-n-alkylphenol having the general formula: ##STR3## to prepare a (2'-chloro-4'-n-alkylphenyl)-3-bromo-4-n-alkoxybenzoate having the general formula: ##STR4## wherein R and R' are straight-chain alkyl groups having from one to eight carbon atoms, and reacting the benzoate (IV) with cuprous cyanide to yield the desired ester (I).

REFERENCES:
patent: 4009934 (1977-03-01), Goodwin et al.
patent: 4099856 (1978-07-01), Weissflog et al.
patent: 4113647 (1978-09-01), Coates et al.
patent: 4138359 (1979-02-01), Mizukuchi
patent: 4173545 (1979-11-01), Beguin et al.
patent: 4230596 (1980-10-01), Beguin et al.
patent: 4235736 (1980-11-01), Beguin et al.
patent: 4279770 (1981-07-01), Inukai et al.
patent: 4279771 (1981-07-01), Shionozaki et al.
patent: 4287085 (1981-09-01), Takei et al.
patent: 4293434 (1981-10-01), Deutscher et al.
DuBois, J. C., et al., Mol. Cryst. Liq. Cryst., vol. 42, pp. 139-152 (1977).

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