Mixtures comprising a nematic liquid crystal and a non-mesomorph

Details Mixtures comprising a nematic liquid crystal and a non-mesomorph Mixtures comprising a nematic liquid crystal and a non-mesomorph

1986-09-24

1988-12-06

Gron, Teddy S.

Compositions

Liquid crystal compositions

Containing nonchiral additive having no specified mesophase

25229962, 25229963, 350350R, 350347E, C09K 1954, C09K 1932, C09K 1930, G02F 113

Patent

active

047895080

ABSTRACT:
The invention relates to a mixture comprising a nematic liquid crystal and a non-mesomorphous compound. The non-mesomorphous compound makes it possible to improve the elastic behavior of the nematic liquid crystal by increasing the value of the ratio K.sub.33 /K.sub.11, in which K.sub.33 represents the elastic bending constant and K.sub.11 the elastic fanning constant of the liquid crystal. The non-mesomorphous compound can be in accordance with the formula: ##STR1## in which R.sup.1 and R.sup.2, which can be the same or different, represent a hydrogen atom or an alkyl radical having 1 to 12 carbon atoms and n is an integer between 2 and 16 and can be associated with liquid crystals or liquid crystal mixtures containing a 1-(alkylcyclohexyl)-2-(alkylfluorobiphenylyl)-ethane. These mixtures can be used as a liquid crystal in a display device.

REFERENCES:
patent: 4180475 (1979-12-01), Schadt et al.
patent: 4643841 (1987-02-01), Ishii et al.
patent: 4695131 (1987-09-01), Balkwill et al.
patent: 4702562 (1987-10-01), Scheuble et al.
patent: 4733949 (1988-03-01), Abe et al.
Gauthier et al., Mol. Cryst. Liq. Cryst. Letters, vol. 3(5), pp. 139-145 (1986).

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