An aqueous dispersion of a multistage polymer comprising a polymer A and a polymer B, wherein the polymer A has a number average molecular weight of from 3,000 to 50,000 by Gel Permeation Chromatography analysis using polystyrene as the standard and comprises as polymerized units, based on the weight of the polymer A, from 2.1% to 10% by weight of a carbonyl-containing functional monomer; from 5% to 15% by weight of an acid monomer, a salt thereof, or mixtures thereof; and from 75% to 92% by weight of a hydrophilic (meth)acrylic acid alkyl ester; being a monomer that has a Hansch value < 2.20, the Hansch value being determined by the method described by A.J. Leo in Chem. Rev., 1993, 93, No. 4, page 1281, and wherein the polymer B comprises as polymerized units, based on the weight of the polymer B, from 0.8% to 10% by weight of a carbonyl-containing functional monomer; from 0.2% to 2.5% by weight of a silicone monomer having the structure of formula II or III, wherein X represents O or NH, R 1 represents a hydrogen atom or a methyl group, each R 2 independently represents a C 1 -C 10 alkyl group, and m, n each independently represents an integer of from 1 to 100; or wherein X represents O or NH, R 3 represents a hydrogen atom or a methyl group, R 4 represents a C 1 -C 6 bivalent hydrocarbon group, R 5 represents a C 1 -C 10 alkyl group or a C 1 -C 10 alkoxyl group, and p represents an integer of from 1 to 100; and from 87% to 99% by weight of an ethylenically unsaturated nonionic monomer; wherein the polymer B has a glass transition temperature calculated by using the Fox equation at least 40°C lower than that of the polymer A, and the weight ratio of the polymer A to the polymer B is from 38:62 to 55:45. wherein the polymer A has a number average molecular weight of from 3,000 to 50,000 by Gel Permeation Chromatography analysis using polystyrene as the standard and comprises as polymerized units, based on the weight of the polymer A, from 2.1% to 10% by weight of a carbonyl-containing functional monomer; from 5% to 15% by weight of an acid monomer, a salt thereof, or mixtures thereof; and from 75% to 92% by weight of a hydrophilic (meth)acrylic acid alkyl ester; being a monomer that has a Hansch value < 2.20, the Hansch value being determined by the method described by A.J. Leo in Chem. Rev., 1993, 93, No. 4, page 1281, and wherein the polymer B comprises as polymerized units, based on the weight of the polymer B, from 0.8% to 10% by weight of a carbonyl-containing functional monomer; from 0.2% to 2.5% by weight of a silicone monomer having the structure of formula II or III, wherein X represents O or NH, R 1 represents a hydrogen atom or a methyl group, each R 2 independently represents a C 1 -C 10 alkyl group, and m, n each independently represents an integer of from 1 to 100; or wherein X represents O or NH, R 3 represents a hydrogen atom or a methyl group, R 4 represents a C 1 -C 6 bivalent hydrocarbon group, R 5 represents a C 1 -C 10 alkyl group or a C 1 -C 10 alkoxyl group, and p represents an integer of from 1 to 100; and from 87% to 99% by weight of an ethylenically unsaturated nonionic monomer; wherein the polymer B has a glass transition temperature calculated by using the Fox equation at least 40°C lower than that of the polymer A, and the weight ratio of the polymer A to the polymer B is from 38:62 to 55:45.