| abstract |
The present invention relates to an aqueous polymer dispersion comprising polymerized units derived from the following monomers, based on 100 parts by weight of a)+b), in a relevant weight ratio of: a) 50 % to 90% monoethylenically unsaturated nonionic monomers, b) 10% to 50% vinyl aromatic monomers or methyl methacrylate, c) 1% to 5% hydroxyl-containing (methyl methacrylate) base) acrylate, d) 0.1% to 3% of an acid monomer selected from the following: d1) an acid monomer selected from a monocarboxylic acid monomer or a dicarboxylic acid monomer and d2) a phosphorus group or a sulfur group Strong acid monomers and/or acid monomers of their salts, or mixtures of d1) and d2), e) 0.001% to 0.5% of chain transfer agents, and f) 0% to 1% of one having at least two The copolymerizable ethylenically unsaturated group internal crosslinking agent, the Tg of the polymer measured by DSC is -30°C to 0°C, and the gel content formed during the polymerization is 0 to 60%. The present invention also relates to a specific preparation method of the dispersion, a coating composition comprising the dispersion, the use of the dispersion in a waterproof cement coating and the resulting final waterproof coating. |