Patent ID: 7632906

Claim:
Composition comprising a) at least one ethylenically unsaturated monomer to which a photochemically isomerizable or dimerizable molecule, which corresponds to the formula A or B, where R′ is hydrogen or C 1 -C 4 -alkyl, A′ is an optionally substituted mono- or divalent aromatic radical or an optionally substituted mono- or divalent heteroaromatic radical, and A 1 is a bridging group, is covalently bonded, b) at least one ethylenically unsaturated monomer to which a sensitizer is covalently bonded, which corresponds to the formula IIa wherein R is H or methyl, R 2 is H, B is —C(O)—, Y is ketocoumarin, carbonylbiscoumarin or benzophenone, X 3 is —O—, and R 3 is a radical of the formula —(R 4 ) r —X 4 —(R 5 ) s where R 4 is C 1 -C 20 -alkylene, polyoxaethylene or polyoxapropylene having from 2 to 10 oxaalkylene units, C 5 - or C 6 -cycloalkylene, -cyclopentyl-C n H 2n — and -cyclohexyl-C n H 2n — where n is 1 or 2, -cyclopentyl-(C n H 2n ) 2 - and -cyclohexyl-(C n H 2n ) 2 - where n is 1 or 2, phenylene, benzylene, phenylethylene or xylylene, R 5 is a direct bond or C 1 -C 4 -alkylene, X 4 is a radical selected from the group of —O—, —S—, —NR 6 —, —C(O)—O—, —O—C(O)—, —O—C(O)—O—,—SO 2 —O—, —O—SO 2 —O—, —NR 6 —C(O)—, —C(O)—NR 6 —, —NR 6 —C(O)—O—, —O—C(O)—NR 6 —, —NR 6 —C(O)—NR 6 —, —NR 6 —SO 2 —, —SO 2 —NR 6 —, —NR 6 —SO 2 —O—, —O—SO 2 —NR 6 — or —NR 6 —SO 2 —NR 6 —, and r is the number 1 and s is 0 or the number 1, and c) optionally other ethylenically unsaturated comonomers.