Aqueous polymer dispersions containing organic compounds having carbonate groups and carbonyl groups and paints and coating systems produced therewith

An aqueous polymer dispersion comprising:

• A) a 20-65% w/w aqueous dispersion of a copolymer of
• (a) from 0.5 to 5% w/w of units of a .alpha.-.beta. unsaturated compound containing one or more carboxyl groups, amide groups or a mixture thereof;
• and
• (b) units of at least two monomers selected from the group consisting of acrylates and methacrylates of C.sub.1-18 alkanols and vinyl aromatic compounds;
• wherein the total amount w/w of units (a) and (b) total 100% w/w;
• and
• B) from 0.1 to 5% w/w, base on the weight of the copolymer contained in component A) of at least one aromatic ketone of the formula (I) ##STR23## wherein R is a straight-chain, C.sub.1 -C.sub.4 -alkyl radical, a branched-chain C.sub.3 -C.sub.4 -alkyl radical, a C.sub.6 -C.sub.20 -aryl radical, or a radical R.sup.1, wherein R.sup.1 is defined below,
• R.sup.1 is ##STR24## wherein R.sup.2 -R.sup.6 each independently are H, C.sub.1 -C.sub.4 -alkyl or phenyl, provided that at least one, but not more than three, of the radicals R.sup.2 -R.sup.6 stand for a radical of the formula ##STR25## wherein A, B, and C are each independently i) a divalent oxyalkylene radical of the formula
• --(CHR.sup.a --CHR.sup.b --O--).sub..gamma. --
• wherein R.sup.a and R.sup.b are each independently H, OH, aryl, COOH, COOCH.sub.3, COOC.sub.2 H.sub.5, or C.sub.1-4 alkyl, and
• y is an integer from 1 to 80;
• ii) a radical of the formula
• --(CH.sub.2).sub.n --O--(CH.sub.2).sub.p --
• where n is an integer from 1 to 5 and p is an integer from 1 to 5;
• iii) a polyoxyalkylene radical of from 2 to 20 oxygen atoms linked by at least one --CH.sub.2 -- or --CH.sub.2 --CH(CH.sub.3)-- group;
• iv) a radical of the formula
• --(CH.sub.2).sub.m --O--CO--O--(CH.sub.2).sub.n --,
• --(CH.sub.2).sub.n --O--CO--NH--(CH.sub.2).sub.m --,
• --(CH.sub.2).sub.n --NH--CO--O--(CH.sub.2).sub.m --,
• --(CH.sub.2).sub.m --CO--O--(CH.sub.2).sub.n --, or
• --(CH.sub.2).sub.m --O--CO--(CH.sub.2).sub.n --,
• wherein m is an integer from 1 to 10 and
• n is an integer from 1 to 10;
• v) a C.sub.5-10 cycloalkylene radical, a (bis)methylenecycloalkylene radical of from 6 to 12 carbon atoms or o--, m-- or p-- phenylene radical;
• and
• k, l and q are each an integer from 1 to 80;
• and
• Z is H, C.sub.1-6 alkyl, phenyl, straight chain C.sub.1-20 alkyl substituted phenyl, branched-chain C.sub.1-20 alkyl substituted phenyl or a radical of the formula ##STR26## wherein the alkyl radicals contain from 1 to 8 carbon atoms and the aryl radicals contain from 6 to 18 carbon atoms, and wherein R.sup.a, R.sup.b, or R.sup.1 and m are defined as above;
• or when R denotes an aryl radical, one of the radicals R.sup.2 to R.sup.6 is O, S, NH, or NR'" which links the aryl radical to R.sup.1 in its ortho-position wherein R'" is H or a C.sub.1 -C.sub.8 -alkyl.