Patent ID: 8546502

Claim:
A production process of a dye polymer having a dye content of from 1 to 50 wt %, the process comprising a living radical polymerization process which uses a dye having a polymerization initiating group as a polymerization initiator and in which a radical in the polymerization initiating group is formed by using a catalyst and then an addition-polymerizable monomer reacts to the radical, wherein the polymerization initiating group is a group of the following formula (1): wherein X and Y may be the same or different and each represent a hydrogen atom, hydrocarbon group, halogen atom, cyano group, alkoxycarbonyl group, allyloxycarbonyl group, acyloxy group, allyloxy group, alkoxy group, alkylcarbonyl group or allylcarbonyl group, and A represents a connecting group to the dye, wherein the catalyst is a compound capable of converting into a radical and is selected from an iodine-containing phosphorus halide, a phosphite compound or a phosphinate compound, an imide compound, a phenol compound, an iodoxyphenyl compound and a vitamin, and wherein a catalyst radical is generated from the catalyst with reacting a free radical generated from organic peroxides or azo compounds to the catalyst and then the catalyst radical generates the radical in the polymerization initiating group by extracting the iodine atom from the group of the formula (1).