Compounds of the general formula A - X (- T) n, wherein A represents wherein Y 1 and Y 2 independently of one another represent substituents of the general formula wherein r represents 0 or 1, preferably 1, R 1, R 2, R 3 independently of one another represent H, OH, C 1-20 -alkyl, C 4-12 -cycloalkyl, C 2-20 -alkenyl, C 1-20 -alkoxy, C 4-12 -cycloalkoxy, C 2-20 -alkenyloxy, C 7-20 -aralkyl, halogen, -C≡N, C 1-5 -haloalkyl, -SO 2 R', -SO 3 H, -SO 3 M (M = alkali metal), -COOR', -CONHR', -CONR'R", -OCOOR', -OCOR', -OCONHR', (meth)acrylamino, (meth)acryloxy; C 6-12 -aryl optionally substituted by C 1-12 -alkyl, C 1-12 -alkoxy, CN and/or by halogen, or C 3-12 -heteroaryl optionally substituted by C 1-12 -alkyl, C 1-12 -alkoxy, CN and/or by halogen, wherein M represents an alkali metal cation, R' and R" represent H, C 1-20 -alkyl, C 4-12 -cycloalkyl; C 6-12 -aryl optionally substituted by C 1-12 -alkyl, C 1-12 -alkoxy, CN and/or by halogen, or C 3-12 -heteroaryl optionally substituted by C 1-12 -alkyl, C 1-12 -alkoxy, CN and/or by halogen, X represents an optionally substituted linear or branched open-chain linker of carbon, oxygen, nitrogen, sulfur, phosphorus and/or silicon in the chain, T represents an acrylate radical -O-(C=O)-CH=CH 2 or a methacrylate radical -O-(C=O)-C(CH 3)=CH 2, and n represents an integer from 2 to 5. A represents wherein Y 1 and Y 2 independently of one another represent substituents of the general formula wherein r represents 0 or 1, preferably 1, R 1, R 2, R 3 independently of one another represent H, OH, C 1-20 -alkyl, C 4-12 -cycloalkyl, C 2-20 -alkenyl, C 1-20 -alkoxy, C 4-12 -cycloalkoxy, C 2-20 -alkenyloxy, C 7-20 -aralkyl, halogen, -C≡N, C 1-5 -haloalkyl, -SO 2 R', -SO 3 H, -SO 3 M (M = alkali metal), -COOR', -CONHR', -CONR'R", -OCOOR', -OCOR', -OCONHR', (meth)acrylamino, (meth)acryloxy; C 6-12 -aryl optionally substituted by C 1-12 -alkyl, C 1-12 -alkoxy, CN and/or by halogen, or C 3-12 -heteroaryl optionally substituted by C 1-12 -alkyl, C 1-12 -alkoxy, CN and/or by halogen, wherein M represents an alkali metal cation, R' and R" represent H, C 1-20 -alkyl, C 4-12 -cycloalkyl; C 6-12 -aryl optionally substituted by C 1-12 -alkyl, C 1-12 -alkoxy, CN and/or by halogen, or C 3-12 -heteroaryl optionally substituted by C 1-12 -alkyl, C 1-12 -alkoxy, CN and/or by halogen, X represents an optionally substituted linear or branched open-chain linker of carbon, oxygen, nitrogen, sulfur, phosphorus and/or silicon in the chain, T represents an acrylate radical -O-(C=O)-CH=CH 2 or a methacrylate radical -O-(C=O)-C(CH 3)=CH 2, and n represents an integer from 2 to 5. Y 1 and Y 2 independently of one another represent substituents of the general formula wherein r represents 0 or 1, preferably 1, R 1, R 2, R 3 independently of one another represent H, OH, C 1-20 -alkyl, C 4-12 -cycloalkyl, C 2-20 -alkenyl, C 1-20 -alkoxy, C 4-12 -cycloalkoxy, C 2-20 -alkenyloxy, C 7-20 -aralkyl, halogen, -C≡N, C 1-5 -haloalkyl, -SO 2 R', -SO 3 H, -SO 3 M (M = alkali metal), -COOR', -CONHR', -CONR'R", -OCOOR', -OCOR', -OCONHR', (meth)acrylamino, (meth)acryloxy; C 6-12 -aryl optionally substituted by C 1-12 -alkyl, C 1-12 -alkoxy, CN and/or by halogen, or C 3-12 -heteroaryl optionally substituted by C 1-12 -alkyl, C 1-12 -alkoxy, CN and/or by halogen, wherein M represents an alkali metal cation, R' and R" represent H, C 1-20 -alkyl, C 4-12 -cycloalkyl; C 6-12 -aryl optionally substituted by C 1-12 -alkyl, C 1-12 -alkoxy, CN and/or by halogen, or C 3-12 -heteroaryl optionally substituted by C 1-12 -alkyl, C 1-12 -alkoxy, CN and/or by halogen, X represents an optionally substituted linear or branched open-chain linker of carbon, oxygen, nitrogen, sulfur, phosphorus and/or silicon in the chain, T represents an acrylate radical -O-(C=O)-CH=CH 2 or a methacrylate radical -O-(C=O)-C(CH 3)=CH 2, and n represents an integer from 2 to 5.