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1. Copolymer comprising
a) a first monomer having at least one photoreactive group of formula (I),and
b) a second monomer having at least one monomer selected from the group of compounds having at least one not-photoreactive or at least one photoreactive group, with the proviso that the second monomer is different from that the first monomer, andwherein
Z represents a bridging group, A and B independently from each other represent an unsubstituted or substituted carbocyclic or heterocyclic aromatic or alicyclic 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, R2 and R3 are independently from each other hydrogen, halogen or nitrile; unsubstituted or with halogen substituted C1-C12alkyl, in which one or more C-atom, CH- or CH2-group may be replaced by a linking group.
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