Patent ID: 6441113
Filing Date: 2002-08-27
Classification: B82Y,C08F,G11B,G11C

Abstract:
A homopolymer formed from monomers which:contain groupings which are at least trinuclear, which are capable of absorbing the electromagnetic radiation of visible light, and which are structured so that in their thermodynamically stable state they are distended and strongly anisometric, wherein the at least trinuclear groupings comprise at least one electron-attracting substituent which gives rise to a dipole moment which forms an angle of at least 20Â° with the longitudinal axis of the at least trinuclear groupings, and further wherein said homopolymer, which, on a main chain which acts as a backbone, contains covalently bonded side groups which branch therefrom, of formula, â€”Â§â€”Tâ€”Qâ€”E â€ƒwherein Â§ denotes one of oxygen, sulphur and NR1, T denotes a (CH2)n radical, optionally interrupted by one of â€”Oâ€”, â€”NR1â€” and â€”OSiR12Oâ€”, and optionally substituted by one of methyl and ethyl, R1 representing one of hydrogen and C1-C4 alkyl, n denotes the number 2, 3 or 4 Q denotes a divalent linking group, and E denotes the trinuclear group, which is represented by the following formula (VII), wherein R2, R2â€², R3, R3â€², R4, R5, R5â€², R6 of ring-A and R6â€² each independently represent hydrogen, chlorine, bromine, trifluoromethyl, methoxy, â€”SO2CH3, â€”SO2CF3, â€”SO2NH2, â€”CN, benzamido and â€”NO2: R6 of the amide linkage â€”C(O)â€”NR6â€” is hydrogen; and R7, R8, R9 and R10 each independently represent hydrogen, chlorine and methyl provided that birefringence effects written into said homopolymer by means of light are thermally stable.