An aqueous dispersion of (meth)acrylic esters of polymers comprising N-hydroxyalkylated lactam units, wherein the aqueous dispersion is obtained by free-radically initiated emulsion polymerization of (meth)acrylic esters of N-hydroxyalkylated lactams and other ethylenically unsaturated monomers, wherein monomers copolymerized comprise
- (a) at least one of styrene, acrylonitrile, methacrylonitrile and methyl methacrylate,
- (b) at least one of C1 to C18 alkyl acrylate and C2 to C18 alkyl methacrylate,
- (c) at least one of acrylic ester of an N-hydroxyalkylated lactam and methacrylic ester of an N-hydroxyalkylated lactam, and
- (d) optionally, other ethylenically unsaturated monomers.