Patent ID: 6924260

Claim:
A method of reducing or preventing soil redeposition on kitchen- and tableware cleaned in an automatic dishwashing machine, comprising the steps of: 1) providing a rinsing composition comprising from 0.2% to 10% relative to the total weight of the composition of a water-soluble or water-dispersible copolymer; and 2) contacting said kitchen- and tableware with the composition in the rinse cycle of an automatic dishwashing machine, wherein the water-soluble or water-dispersible copolymer reduces or prevents redeposition of soils on the kitchen- and tableware wherein the water-soluble or water-dispersible copolymer comprises, in the form of polymerized units: (a) at least one monomer compound of general formula I: in which: R 1 and R 4 , independently of each other, represent a hydrogen atom or a linear or branched C 1 -C 6 alkyl group; R 2 and R 3 , independently of each other, represent an alkyl, hydroxyalkyl or aminoalkyl group in which the alkyl group is a linear or branched C 1 -C 6 chain, preferably a methyl group; n and m are integers between 1 and 3; X, which may be identical or different, represent counterions which are compatible with the water-soluble or water-dispersible nature of the polymer; (b) at least one hydrophilic monomer bearing a function of acidic nature which is copolymerizable with (a) and capable of ionizing in the application medium, (c) optionally, at least one hydrophilic monomer compound containing ethylenic unsaturation and of neutral charge, bearing one or more hydrophilic groups, which is copolymerizable with (a) and (b); and wherein the a/b molar ratio is between 50/50 and 10/90.