abstract |
A liquid crystalline copolymer contains a comonomer to which a radical <IMAGE> is bonded, where X is a chemical bond, O or NR1, Y is a chemical bond or -CO-, R1 is hydrogen or C1-C4-alkyl and A is a linear or branched C2-C20-alkylene group which may be interrupted by -O- or <IMAGE> The liquid crystalline copolymers have very good lightfastness, high dichroism and a high absorption. |