5-Substituted-2-(4-cyanophenyl)-1,3-dioxanes

Details 5-Substituted-2-(4-cyanophenyl)-1,3-dioxanes 5-Substituted-2-(4-cyanophenyl)-1,3-dioxanes

1981-07-06

1982-06-15

Gron, Teddy S.

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

350350R, C09K 334, C02F 113

Patent

active

043350127

ABSTRACT:
Compounds of the formula: ##STR1## wherein R is an alkyl, alkoxy, aryl, aryloxy, arylester, carboxy or ester derived from carboxy are used as liquid crystal materials in electro-optical displays.
A typical embodiment is 5-butyl-2-(4-cyanophenyl)-1,3-dioxane which has a very low threshold voltage in nematic displays. On rubbed indium oxide surfaces the threshold voltage was 0.6 V using predominately the trans isomer. It was nematic over the range 32.2.degree. C. to 34.6.degree. C.

REFERENCES:
patent: 3947375 (1976-03-01), Gray et al.
patent: 3997536 (1976-12-01), Boller et al.
patent: 4200580 (1980-04-01), Hsu
patent: 4298528 (1981-11-01), Sethofer
Sorkin, H., Mol. Cryst. Liq. Cryst. vol. 56 (Letters), pp. 279-281 (1980).
Boller, A., et al., Mol Cryst. Liq. Cryst., vol. 42, pp. 215-231, (1977).
Demus, D., et al., Mol. Cryst. Liq. Cryst., vol. 63, pp. 129-144, (1981).

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