Patent ID: 7288605

Claim:
A polymer dye on the basis of dicyanomethylene (DCM) having the general formula I wherein R 1 =H, straight-chain, branched or cyclic alkyl or alkoxy group with 1-20 C atoms, whereby R 1 can be bridged with R 2 by a ring of carbon atoms, R 2, R 3 =independently of each other, H, straight-chain, branched or cyclic alkyl or alkoxy group having 1-20 C atoms or aryl, whereby at least one of the two groups is a group having the general formula II wherein R 4 , R 5 =independently of each other, H, straight-chain, branched or cyclic alkyl or alkoxy group with 1-20 C atoms, R 6 , R 7 =selected independently of each other, H, straight=chain, branched or cyclic alkyl or alkoxy group having 1-20 C atoms, aryl, carbocyclic or heterocyclic group, whereby R 4 can be bridged with R 7 and/or R 5 with R 6 by a ring of carbon atoms, and at least one of the groups R 6 and R 7 represents a copolymer backbone, producible by copolymerization of a first comonomer selected from the group consisting of: dicarboxylic acids, dicarboxylic acid chlorides, dicarboxylic anhydrides and diisocyanates; and a second comonomer selected from the group consisting of: dihydroxy and diamino compounds.