Patent ID: 7728063

Claim:
A method of reducing or preventing dye transfer between textiles during washing of colored textiles, the method comprising washing the colored textiles in the presence of a solid or liquid detergent comprising a copolymer comprising, in polymerized form, (a) from 80 to 99.9 mol %, based on the total amount of the monomers polymerized to prepare the copolymer, of at least one monomer A which in each case comprises a heterocycle having at least 1 nitrogen atom and composed of from 3 to 10 ring members and a C 2 -C 6 -alkenyl group bonded to a carbon or nitrogen ring atom of the heterocycle; and (b) from 0.1 to 20 mol %, based on the total amount of the monomers polymerized to prepare the copolymer, of at least one monomer B copolymerizable with monomer A, said monomer B having a monoethylenically unsaturated double bond and also a linear or branched poly-C 2 -C 4 -alkylene oxide group having on average from 4 to 500 C 2 -C 4 -alkylene oxide units.