Patent ID: 9536513
Date: 2017-01-03
CPC Classifications: C08F,C08K,C09D,G10K

Claim:
1. An aqueous polymer dispersion, comprising at least one polymer obtained by emulsion polymerization of a monomer mixture comprising hydrophilic monomers (a) to (c) having hydrophilic groups; (a) at least one (meth)acrylate monomer comprising a polyethylene glycol group; (b) at least one acid monomer; and (c) at least one hydroxyalkyl(meth)acrylate having 1 to 20 C atoms in the alkyl group, and also at least one hydrophobic principal monomer (d) selected from: (d) an alkyl(meth)acrylate having 1 to 20 C atoms in the alkyl group, a vinylaromatic compound, and a mixture of these monomers, and also, optionally: (e) at least one further monomer, different from the monomers (a) to (d), which is ethylenically unsaturated and radically polymerizable, wherein the polymer is obtained by an at least two-stage emulsion polymerization comprising a first polymerization stage with a predominant fraction or an entire amount of the hydrophilic monomers (a) to (c), and a later polymerization stage with a predominant fraction or an entire amount of the hydrophobic monomers (d).