Method for producing polymer powders that can be easily redispersed in water
AssigneeBASF Aktiegesellschaft
InventorsInes Pietsch, Joachim Pakusch, Oliver Reese, Heinrich Sack
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Abstract
A process for the preparation of a readily water-redispersible polymer powder by spray drying of an aqueous polymer dispersion in the presence of a novel spray drying assistant.
Claims14
A process for the preparation of a readily water-redispersible polymer powder by spray drying of an aqueous polymer dispersion, wherein the spray drying of the aqueous polymer dispersion is effected in the presence of a spray assistant A which was obtained by reacting a dihydroxydiphenyl sulfone with from 0.5 to 5 mol of an aliphatic aldehyde of 1 to 6 carbon atoms and from 0.4 to 2 mol of sodium sulfite per mole of dihydroxydiphenyl sulfone at from 90 to 180° C.
The method of using a reaction product which was obtained by reacting a dihydroxydiphenyl sulfone with from 0.5 to 5 mol of an aliphatic aldehyde of 1 to 6 carbon atoms and from 0.4 to 2 mol of sodium sulfite per mole of dihydroxydiphenyl sulfone at from 90 to 180° C., as a spray assistant in the spray drying of aqueous polymer dispersions.
Dependencies are inferred from the claim text.