Photoaligning materials

摘要

The present invention relates to polymer, homo- or copolymer or oligomer, which, when irradiated with polarised light orients perpendicular to the polarization direction of polarized actinic light, for the photoalignment of liquid crystals, especially for the planar orientation of liquid crystals, and which derives from at least one monomer (I), compositions thereof, and its use for optical and electro optical devices, such as, liquid crystal devices (LCDs), especially for planar orientation of liquid crystals.

主权项

1. Polymer or oligomer formed from at least one monomer (I): wherein, A represents an unsubstituted or substituted carbocyclic or heterocyclic aromatic group selected from a monocyclic ring of five or six atoms, two adjacent monocyclic rings of five or six atoms, a bicyclic ring system of eight, nine or ten atoms, or a tricyclic ring system of thirteen or fourteen atoms or a group “E”; B represents an unsubstituted or substituted, straight-chain C1-C16alkyl, wherein at least one —C—, —CH—, —CH2— or —CH3 group is independently from each other replaced by at least one heteroatom, or a primary,secondary, tertiary, or quaternary nitrogen, and wherein the C1-C16alkyl group is substituted by at least one di-(C1-C16alkyl)amino, nitrile, or unsubstituted or substituted straight-chain or branched alkynyl; D represents a polymerizable group; E represents an aromatic group, a single bond, an oxygen atom, a sulphur atom, —NH—, —N(C1-C6alkyl)—, —CR2R3, —OCO—, —COO—, —OOC—, —NHCO—, —CONH—, —CONR2—, —NR2CO —,—SCS—, or —CO—
wherein R2 and R3 are independently from each other hydrogen or a cyclic, straight-chain or branched, substituted or unsubstituted C1-C24alkyl, wherein one or more —C—, —CH—, —CH2— group(s) may be independently from each other unreplaced or replaced by a linking group, and with the proviso that at least one of R2 and R3 is not hydrogen; S1, S2 each independently from each other represents a spacer unit; X, Y each independently from each other represents hydrogen, fluorine, bromine, chlorine, nitrile, or unsubstituted or with fluorine substituted C1-C12alkyl, wherein one or more —CH2— groups may be unreplaced or replaced by a linking group; n, n1 each independently from each other represents 1, 2, 3 or 4, with the proviso that if n is 2, 3, or 4, each A, B, E, S1, S2, X, Y are identical or different; and if n1 is 2, 3 or 4 each B, is identical or different; and with the proviso that if B is substituted with at least one fluorine then there is at least one additional polar group in (I), wherein the polymer or oligomer orients perpendicular to the polarization direction of polarized actinic light when irradiated with polarized light, for the photoalignment of liquid crystals.