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Acrylic polymer emulsion

  • US 4,385,152 A
  • Filed: 10/13/1981
  • Issued: 05/24/1983
  • Est. Priority Date: 11/06/1979
  • Status: Expired due to Term
First Claim
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1. A cementitious coating composition which forms a film at or below room temperature and which film has low dirt pickup properties comprising an aqueous film forming emulsion consisting essentially of(a) a polymer formed by first reacting a minor portion of(i) a monomer mixture comprising one or more monomers selected from acrylic or methacrylic acid esters of alcohols of 1 to 4 carbon atoms in conjunction with a minor amount of one or more monomers selected from divinyl benzene and acrylic or methacrylic acid esters of alcohols of 1 to 8 carbon atoms which monomer mixture yields a polymer having glass transition temperatures between 50°

  • and 150°

    C. and subsequently adding to said first reaction mixture a major portion of(ii) a monomer mixture comprising a major amount of one of more monomers selected from acrylic or methacrylic acid esters of alcohols of 1 to 4 carbon atoms and one or more monomers selected from acrylic acid or methacrylic acid esters of alcohols of 1 to 8 carbon atoms with a minor amount of acrylic acid and/or methacrylic acid which monomer mixture yields a polymer having a glass transition temperature in the range of -10°

    to 10°

    C.;

    in admixture with(b) a polymer formed by reacting a mixture of a major amount of one or more monomers selected from acrylic or methacrylic acid esters of alcohols of 1 to 4 carbon atoms and a minor portion of one or more acrylic acid esters of alcohols of 1 to 8 carbon atoms with acrylic and/or methacrylic acid, wherein the weight ratio of a (ii) to a (i) is within the range of 67;

    33 to 95;

    5 and the ratio of (a) to (b) is within the range of 3;

    1 to 1;

    2.

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