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AssigneeUniversity of Rochester
InventorsShaw H. Chen, John C. Mastrangelo, Hongqin Shi, Sushil Krishnamurthy
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A thermotropic chiral nematic liquid crystalline copolymer composition comprises ##STR1## wherein --NEM-- and --NEM'-- are each independently nematogenic units of formula ##STR2## wherein R is H or CH.sub.3, --Q-- is an alkylene radical having 1 to about 8 carbon atoms, --X-- is --O--, --S--, or --CH.sub.2 --, --Y-- is ##STR3## --Z is --CN, --NO.sub.2 or --N.dbd.C.dbd.S, q and r are each independently 0 or 1; wherein --CHI-- is a chiral unit of formula ##STR4## wherein R is H or CH.sub.3, --Q'-- is an alkylene radical having 1 to about 8 carbon atoms, --X'-- is --O--, --S--, or --CH.sub.2 --, --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. This compolymer composition is employed to form an optical device.
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 CH.sub.3, --Q-- is an alkylene radical having 1 to about 8 carbon atoms,
An optical device comprising an optically transparent substrate and a film formed from a chiral nematic liquid crystalline copolymer composition comprised of the repeating units of the formula ##STR51## wherein --NEM-- and --NEM'-- are each independently nematogenic units of formula ##STR52## wherein R is H or CH.sub.3, --Q-- is an alkylene radical having 1 to about 8 carbon atoms,
Dependencies are inferred from the claim text.