Chiral dopants for liquid crystalline mixtures

Details Chiral dopants for liquid crystalline mixtures Chiral dopants for liquid crystalline mixtures

1990-08-22

1992-03-03

Stoll, Robert L.

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

25229901, 2522992, 560102, 568631, 568633, C09K 1930, C09K 1958, C07C 4100, C07C 6976

Patent

active

050930273

ABSTRACT:
Optically active dopants of the formula ##STR1## wherein A represents an optically active group selected from 1,1'-binaphthyl-2,2'-diyl, --CHR.sup.1 --CHR.sup.2 -- or --CH(COOR.sup.3)--CH(COOR.sup.4)--; Z denotes a group --(CH.sub.2).sub.4 --, --O(CH.sub.2).sub.3 -- or the trans form of --OCH.sub.2 --CH.dbd.CH--; R.sup.1 is hydrogen, methyl, phenyl or cyclohexyl; R.sup.2 is methyl, phenyl or cyclohexyl; R.sup.3 and R.sup.4 denote alkyl; Y stands for --CO-- or --CH.sub.2 --; ring B represents 1,4-phenylene or trans-1,4-cyclohexylene; and R is hydrogen, alkyl, alkoxy or cyano, liquid crystalline mixtures which contain such dopants and their use for optical and electro-optical purposes.

REFERENCES:
patent: 4826620 (1989-05-01), Heppke et al.
patent: 4886619 (1989-12-01), Janulis
Heppke et al., "Chiral Dotierstoffe". Handout at 15th Symposium on Liquid Crystals in Freiburg, Germany (1986).

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