Abstract:
The present invention provides aqueous finely divided polymer dispersions which at low temperatures are film-forming, exhibit good blocking resistance in a formulation, even at elevated temperatures, and display a low foam tendency, processes for preparing them, and their use as binders for coating substrates.
Abstract:
The present invention relates to coating compositions which comprise dispersions of polymers obtained by a two-stage procedure, to processes for preparing them, and to their use.
Abstract:
The present invention relates to a process for preparing a polymer dispersion foam L, where:a) a mixture M which comprises at least one conjugated diene monomer A and at least one ethylenically unsaturated comonomer B is polymerized by free-radical aqueous emulsion polymerization in the presence of at least one emulsifier to give a fine polymer dispersion P,b) the fine polymer dispersion P is pressure-agglomerated to give a coarse polymer dispersion G,c) the polymer dispersion G is concentrated, if desired, and is mixed, if desired, with a reinforcer dispersion H, andd) the dispersion from c) is foamed to give a polymer dispersion foam L,which comprises adjusting the average particle size and the particle size distribution of G by varying a parameter selected from:I) the solids content of P,II) the agglomeration temperature in step b),III) the agglomeration pressure in step b),IV) the content of comonomer B in the mixture M,V) the concentration of the emulsifier in P,VI) the agglomeration throughput,to polymer dispersion foams obtainable by this process and to their use.