Aqueous dispersions of cross-linkable copolymers based on (meth)acrylates, their preparation and use as stoving enamels

Claim 1

An aqueous dispersion for use in stoving enamels containing from 30% to 70% by weight of a cross-linkable copolymer consisting essentially of: (a) from 30% to 70% by weight of said copolymer of monomer units of monomers giving homopolymers having a glass transition temperature of 80° C. or higher selected from the group consisting of alkyl esters with alkyl having from 1 to 4 carbon atoms of methacrylic acid and styrene, (b) from 19% to 69% by weight of said copolymer of monomer units of monomers giving homopolymers having a glass transition temperature of 10° C. or lower, said monomers being alkyl esters with alkyl having from 1 to 8 carbon atoms of acrylic acid, (c) from 0 to 20% by weight of said copolymer of monomer units of other monomers selected from the group consisting of (meth)acrylic acid and its salts, (meth)acrylamide, (meth)acrylonitrile, N-methylol-(meth)acrylamide, N-alkoxymethyl-(meth)acrylamide, N-vinyl-2-pyrrolidone, N-vinyl-lactams, butadiene, isoprene, divinylbenzene, vinyl lower alkanoates, vinyl halides, vinylidene halides, ethylene, alkenedioic acids having from 4 to 8 carbon atoms, salts of alkenedioic acids having from 4 to 8 carbon atoms, mono-lower alkyl esters of alkenedioic acids having from 1 to 8 carbon atoms, di-lower alkyl esters of alkenedioic acids having from 1 to 8 carbon atoms, monoamides of alkenedioic acids having from 1 to 8 carbon atoms, and diamides of alkenedioic acids having from 1 to 8 carbon atoms, and (d) from 1% to 15% by weight of said copolymers of monomer units of (meth)allyl esters of the formula ##STR7## wherein R represents a straight-chained alkylene having 2 to 10 carbon atoms, optionally substituted with up to three methyl and/or ethyl groups, and R' represents a member selected from the group consisting of hydrogen and methyl, where the hydroxy group is linked to a carbon atom having at least one hydrogen attached thereto.