Liquid crystal dielectrics, new dyestuffs useful therein, proces

Details Liquid crystal dielectrics, new dyestuffs useful therein, proces Liquid crystal dielectrics, new dyestuffs useful therein, proces

1983-01-28

1985-02-12

Gron, Teddy S.

Compositions

Liquid crystal compositions

Containing pleochroic dye

260396R, 350349, G02F 113, C09K 334

Patent

active

044990049

ABSTRACT:
A new liquid crystal dielectric contains at least one dyestuff of formula I ##STR1## wherein R.sup.1 and R.sup.2 are identical or different and each is alkyl or alkoxy each of 3 to 8 C atoms or a group Z--Y--, or one of R.sup.1 and R.sup.2 can also be hydrogen, methyl, ethyl, methoxy or ethoxy; Z is R--Ph--, R--Ph--Ph--, R--Cy--, R--Cy--Cy--, R--Cy--Ph-- or R--Ph--Cy--; Ph is 1,4-phenylene; Cy is 1,4-cyclohexylene; Y is --CH.sub.2 --, --O--, --S--, --NH--, --CH.sub.2 CH.sub.2 --, --CH.sub.2 --O--, --CH.sub.2 --S--, --CH.sub.2 --NH--, or a direct bond; and R is hydrogen or alkyl or alkoxy, each of 1-8 C atoms.

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