Liquid crystal mixtures

Details Liquid crystal mixtures Liquid crystal mixtures

1977-05-04

1978-10-24

Schafer, Richard E.

Compositions

Liquid crystal compositions

252408, 350350, 260465E, 260465D, 260566R, 260205, 2602071, 260576, 260578, 260562P, 260456A, 560 19, 560 20, 560 11, 560 49, C09K 334, G02F 113

Patent

active

041220269

ABSTRACT:
A nematic liquid crystal mixture comprises at least one nematic liquid crystal compound and an amount, sufficient to impart a positive DC anisotropy of at least about 15 to said mixture, of at least one liquid crystalline or potentially liquid crystalline compound having a positive DC anisotropy of above about 25, of the formula (1) ##STR1## wherein X is a monovalent radical of the formula --NR.sup.3 R.sup.4 or --N(R.sup.5)(CHO); Y is a bivalent radical of the formula --CH.dbd.N--, --N.dbd.CH--, --N.dbd.N--, --CH.dbd.CH--, --C(O)O--, --O(O)C--, --C(O)S--, --S(O)C--, --C.tbd.C-- or ##STR2## Z is a monovalent radical of the formula --CN, --NO.sub.2, --SO.sub.2 CH.sub.3, --SO.sub.2 CF.sub.3 or --NHCOR.sup.5 ; R.sup.1 and R.sup.2 are the same or different and each is fluorine, chlorine, bromine, methyl or hydroxy; R.sup.3 and R.sup.4 are the same or different and each is hydrogen or an alkyl group containing from 1 to 8 carbon atoms; R.sup.5 is an alkyl group containing from 1 to 8 carbon atoms; p is zero or 1; and m and n are the same or different integers from zero to 4.

REFERENCES:
patent: 3796479 (1974-03-01), Helfrich et al.
patent: 3853785 (1974-12-01), Labes
patent: 3983049 (1976-09-01), Aftergut et al.
patent: 3988054 (1976-10-01), Yaguchi et al.
patent: 4011173 (1977-03-01), Steinstrasser
patent: 4027950 (1977-06-01), Moriyama et al.
Dave, J. S., et al., J. Chem. Soc. (A), pp. 1473-1478 (1967).
Bloom, A., et al., Mol. Cryst. Liq. Cryst., vol. 41, pp. 1-4 (1977).

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