| abstract |
The present invention provides a compound comprising a repeating unit of formula (I) <CHEM> in which: A represents a nitrogen atom, a carbon atom, a group -CR<1>- or an aromatic or alicyclic group, wherein R<1> represents a hydrogen atom or lower alkyl, M represents a repeating monomer unit; n<1> to n<3> each independently represent 0 or an integer having a value of from 1 to 3, with the proviso that 1 < n<1> + n<2> + n<3> < 4; P<1>, P<2>, P<3> each independently represent a photoactive group; and B<1> to B<4> each independently represent a residue of general formula II <CHEM> as well as photoactive polymers prepared from such compounds and the use of such compounds in the preparation of liquid crystal orientation layers and structured and unstructured electro-optical elements. |