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    • 33. 发明授权
    • Aqueous polymer dispersions as binders for elastic, nonblocking and
scratch-resistant coatings
    • US06005042A
    • 1999-12-21
    • US811168
    • 1997-03-04
    • Ulrich DesorStephan Krieger
    • Ulrich DesorStephan Krieger
    • C08F2/22C08F216/00C08F291/00C09D15/00C09D181/00C09D201/00C08F2/24
    • C09D181/00C08F291/00
    • A polymer dispersion having a minimum film-forming temperature in the range from 0 to 40.degree. C., which is useful in coating compositions for substrates, in the form of varnishes or gloss paints, is obtained by stepwise emulsion polymerization, which includes polymerizing, onto a first stage having the monomer composition I comprising: from 50 to 68.5% by weight of soft monomers A whose homopolymers have a glass transition temperature (T.sub.g) below 0.degree. C.; from 30 to 50% by weight of hard monomers B whose homopolymers have a glass transition temperature (T.sub.g) above 65.degree. C.; from 0.5 to 5% by weight of .alpha.,.beta.-unsaturated carboxylic acids and/or carboxamides C which are copolymerizable with A and B; from 1 to 7.5% by weight of ethylenically unsaturated monomers D containing keto groups; and from 0 to 10% by weight of other ethylenically unsaturated monomers E which do not contain a nitrogen atom, where the weight percentages in each case are based on the overall amount of the polymer of the first stage, a second stage having the monomer composition II comprising: from 5 to 45% by weight of soft monomers A whose homopolymers have a glass transition temperature (T.sub.g) below 0.degree. C.; from 65 to 95% by weight of hard monomers B whose homopolymers have a glass transition temperature (T.sub.g) above 65.degree. C.; from 0 to 4% by weight of .alpha.,.beta.-unsaturated carboxylic acids and/or carboxamides C which are copolymerizable with A and B; from 0 to 5% by weight of ethylenically unsaturated monomers D containing keto groups; and from 0 to 10% by weight of other ethylenically unsaturated monomers E which do not contain a nitrogen atom, where the weight percentages in each case are based on the overall amount of the polymer of the second stage, in a weight ratio of the monomer composition I to the monomer composition II of from 50:50 to 75:25.