Cholesteric liquid crystal polyester containing optically active group

Abstract From the Canadian patent

A cholesteric liquid crystal polyester containing an optically active group, constituted of the structural units: (A) -O-Ar-CO- where Ar is a bivalent aromatic ring having 6 to 12 carbons; (B), where the mark * denotes optical activity; (C) -O-R1-O-; (D) -CO-R2-CO-; where R1 and R2 each represent a bivalent aromatic ring having 6 to 18 carbons a bivalent, aliphatic chain having 2 to 16 carbons or a bivalent, alicyclic ring having 6 to 18 carbons. The liquid crystal polyester comprises 20 to 90 mole % of (A) 5 to, 40 mole % of (B), 5 to 40 moles % of (C) and 0 to 30, mole % of (D), and has a reduced viscosity of not less than 0.2 dl/g at a temperature of 60°C at a concentration of 0.5 g/dl …