Anisotropic compounds with negative or positive DC-anisotropy an

Details Anisotropic compounds with negative or positive DC-anisotropy an Anisotropic compounds with negative or positive DC-anisotropy an

1980-06-30

1983-01-11

Gron, Teddy S.

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

2522995, 260465D, 260465R, 260465G, 260465H, 260465F, 560 1, 560 20, 560 21, 560 23, 560 59, 560 61, 560 62, 560 64, 560 65, 560 73, 560102, 560106, 560107, 560118, 560126, 568585, 568631, 568642, 568648, 568649, 568656, 568659, 568661, 570129, 570182, C09K 334, C07C12175

Patent

active

043681352

ABSTRACT:
Anisotropic compounds with negative or positive DCA and .DELTA.n.ltoreq.0.2 have the formula (1) ##STR1## in which R.sup.1 and R.sup.2 l are independently hydrogen, alkyl, alkoxy having 1 to 12 carbon atoms respectively, or one of R.sup.1 and R.sup.2 can represent cyclical fragment of formulae (1a) or (1b); ##STR2## the bridges Z.sup.1, Z.sup.2 and Z.sup.3 are identical or different and means covalent bonds or carboxyl or oxycarbonyl groups; R.sup.3 is hydrogen, alkyl or alkoxy group having 1 to 12 carbon atoms, respectively; X.sup.1 and X.sup.4 are independently hydrogen, halogen, nitrile or nitro, wherein at least one of X.sup.1 and X.sup.4 is not hydrogen when R.sup.2 represents a cyclical fragment of formula (1a) or (1b) and Z.sup.2 is a carboxyl group or Z.sup.3 is an oxycarbonyl group, respectively. Liquid crystal compositions are also disclosed.

REFERENCES:
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patent: 4222887 (1980-09-01), Matsufusi
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patent: 4256656 (1981-03-01), Beguin et al.
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patent: 4290905 (1981-09-01), Kanbe
Dewar, M. J. S., et al.; JACS, vol. 92, No. 6, pp. 1582-1586 (1970).
Demus, D., et al., Mol. Cryst. Liq. Cryst., vol. 63, pp. 129-144 (1981).
Gray, C. W., et al.; Mol. Cryst. Liq. Cryst., vol. 67, No. 1-4, pp. 1-24 (1981).

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