Patent ID: 6156866
Filing Date: 2000-12-05
Classification: C08G,C09K

Abstract:
A chiral nematic polycarbonate having carbonate units, of the formula I ##STR19## where the w/x/y/z molar ratio is 1 to 20/1 to 5/0 to 10/0 to 10, A is a mesogenic group of the formula ##STR20## B is a chiral group of the formula ##STR21## D is a photoreactive group of the formula ##STR22## and E is another, nonchiral group of the formula ##STR23## where, in the above formulae L is alkyl, alkoxy, halogen, COOR, OCOR, CONHR or NHCOR,X is S, O, N, CH.sub.2 or a single bond,R is alkyl or hydrogen,A.sup.1 is a single bond, (CH.sub.2).sub.n, O(CH.sub.2).sub.n, S(CH.sub.2).sub.n, NR(CH.sub.2).sub.n, ##STR24## or ##STR25## R.sup.1 is hydrogen, halogen, alkyl or phenyl, and n is an integer from 1 to 15.