| 摘要 |
<p>The invention relates to an aqueous dispersion of multi-layered polymer particles, which particles comprise (a) a core obtained by emulsion polymerization of ethylene and a vinyl monomer selected from the group consisting of (1) vinyl chloride, and (2) a vinyl ester of a C1-13 alkanoic acid, a free-radically polymerizable monomer containing at least two double bonds, and optionally vinyl chloride, and (b) a shell obtained by copolymerization in a subsequent step of (1) 30 to 90 wt.% of a (cyclo)alkyl ester of (meth)acrylic acid containing 4 to 12 carbon atoms in the alkyl group, (2) 10 to 70 wt.% of a monoethylenically unsaturated monomer selected from the group consisting of an alkyl ester of (meth)acrylic acid containing 1 to 3 carbon atoms in the alkyl group, styrene, ( alpha )methylstyrene and mixtures thereof, and (3) 0 to 20 wt.% of a different copolymerizable, monethylenically unsaturated monomer. The invention also provides a coating composition based on said dispersion.</p> |
