FINELY DIVIDED AQUEOUS MULTISTAGE POLYMERIZATE DISPERSION, METHOD FOR THE PRODUCTION THEREOF, AND USE THEREOF AS A BINDER

The invention relates to a very finely divided polymerizate dispersion, which can be obtained by means of at least a two-stage emulsion polymerization, wherein 1) an acid-rich first polymerizate P1 is produced from a first composition by radical polymerization, the first composition comprising A) at least one monomer selected from the group of the (meth)acrylic acid (cyclo)alkyl esters, the vinyl aromatics having up to 20 C atoms, a radically polymerizable compound selected from the group of the ethylenically unsaturated nitriles having up to 20 C atoms, vinyl esters of carboxylic acids containing up to 20 C atoms, vinyl halogenides having up to 10 C atoms, and vinyl ethers of alcohols containing 1 to 10 C atoms, B) at least one α,β-ethylenically unsaturated carboxylic acid, C) at least one cross-linking monomer having a keto group or aldehyde group, D) optionally at least one adhesion promoter, E) optionally t-butyl acrylate, F) optionally further monomers M, in the presence of a chain length regulator, 2) the polymerizate P1 produced under 1) is mixed with a base, 3) a hydrophobic polymerizate P2 is produced from a second composition by radical polymerization in the presence of the polymerizate P1 treated under 2), the second composition comprising A) at least one monomer selected from the group of the (meth)acrylic acid (cyclo)alkyl esters, the vinyl aromatics having up to 20 C atoms, a radically polymerizable compound selected from the group of the ethylenically unsaturated nitriles having up to 20 C atoms, vinyl esters of carboxylic acids containing up to 20 C atoms, vinyl halogenides having up to 10 C atoms, and vinyl ethers of alcohols containing 1 to 10 C atoms, B) optionally at least one α,β-ethylenically unsaturated carboxylic acid, C) at least one cross-linking monomer having a keto group or aldehyde group, D) optionally at least one adhesion promoter, and E) optionally further monomers M, 4) and by optionally adding a water-soluble at least trifunctional alkoxylated polyamine, in particular an ethoxylated and/or propoxylated triamine, after the polymerization of P1 and P2.