Polymer dispersions and sound deadener compositions with emulsion polymer from two-stage preparation

摘要

A description is given of an aqueous polymer dispersion comprising a polymer which is obtainable by emulsion polymerization from a monomer mixture comprising as hydrophilic monomers ethoxylated (meth)acrylate monomer, acid monomer, and C1 to C20 hydroxyalkyl(meth)acrylate; and also at least one hydrophobic principal monomer, selected from C1 to C20 alkyl(meth)acrylates and vinylaromatics; and also, optionally, further monomers. This polymer is preparable by at least two-stage emulsion polymerization, where in a first polymerization stage the predominant fraction or the entire amount of the hydrophilic monomers is used, and in a later polymerization stage the predominant fraction or the entire amount of the hydrophobic monomers is used. The polymer dispersion is a suitable binder for aqueous particle dispersions, more particularly of sound deadener compositions, which comprise inorganic and optionally also organic particulate solids. Also described is a method for damping oscillations or vibrations of vehicle components.

主权项

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).