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Thermotropic chiral nematic liquid crystalline copolymers

  • US 5,332,522 A
  • Filed: 04/29/1993
  • Issued: 07/26/1994
  • Est. Priority Date: 04/29/1993
  • Status: Expired due to Fees
First Claim
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1. A chiral nematic liquid crystalline copolymer composition comprised of the repeating units of formula ##STR39## wherein --NEM-- and --NEM'"'"'-- are each independently nematogenic units of formula ##STR40## wherein R is H or CH3, --Q-- is an alkylene radical having 1 to about 8 carbon atoms,--X-- is --O--, --S--, or --CH2 --, --Y-- is ##STR41## --Z is --CN, --NO2, or --N═

  • C═

    S, q and r are each independently 0 or 1;

    wherein --CHI-- is a chiral unit of formula ##STR42## wherein R is H or CH3, --Q'"'"'-- is an alkylene radical having 1 to about 8 carbon atoms,--X'"'"'-- is --O--, --S--, or --CH2 --,--Z'"'"' is an alkoxy, aralkoxy, alkylamino, or aralkylamino radical having 4 to about 12 carbon atoms and containing at least one asymmetric carbon atom,q'"'"' and r'"'"' are each independently 0 or 1;

    and wherein x is the mole fraction of chiral units, and (y+y'"'"') is the total mole fraction of nematogenic units in said copolymer composition, and the ratio of x to (y+y'"'"') is from about 1;

    50 to 1;

    1.

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