Halogenated diphenyldiacetylene liquid crystals

Details Halogenated diphenyldiacetylene liquid crystals Halogenated diphenyldiacetylene liquid crystals

1991-03-11

1993-01-12

Stoll, Robert L.

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

25229901, 568647, C09K 1906, C09K 1952

Patent

active

051787911

ABSTRACT:
The present invention provides liquid crystals that are 3,3'-dihalogenated diphenyldiacetylenes of the general formula: ##STR1## where X and Y are, independently of one another, a halogen atom and T.sub.1 and T.sub.2, independently of one another are alkyl or alkenyl or alkoxy tail groups, R.sub.1, R.sub.2, or OR.sub.3, respectively, wherein R.sub.1 and R.sub.3, independently of one another, are straight-chain or branched alkyl groups having three to twenty carbon atoms and R.sub.2 is a mono or diene which may be branched or straight-chain having three to twenty carbon atoms. R.sub.1, R.sub.2, or R.sub.3 may be substituted with one or more halogens, particularly fluorines, except that the C-1 carbon of an OR.sub.3 tail may not be halogenated. One or two non-neighboring CH.sub.2 groups of R.sub.1 or R.sub.3 may be substituted with an O atom, except that the C-1 CH.sub.2 group of an OR.sub.3 tail may not be substituted with an O atom. Liquid crystals in which X=Y=fluorine and T.sub.1 =T.sub.2 are more preferred. Compounds in which R.sub.1, R.sub.2 and R.sub.3 are straight-chain alkyl groups or .omega.-monoene groups are more preferred.

REFERENCES:
patent: 4431263 (1984-02-01), Garito
patent: 4778458 (1988-03-01), Higuchi et al.
patent: 4895975 (1990-01-01), Fujiwara
Grant et al., (1978), Mol. Cryst. Liq. Cryst., 48:175-182.
Barrall et al., (1978), Liq. Cryst. Ordered Fluids, 3:19-39.

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