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US 11,685,696 B2Granted
Process for producing an aqueous dispersion and redispersible dispersion powder produced therefrom
AssigneeBASF SE
InventorsChristian Schmidtke, Ekkehard Jahns, Torben Gaedt, Martin Winklbauer, Klaus Seip, Iris Loescher
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Abstract
The present invention relates to a process for producing a redispersible dispersion powder, to the redispersible dispersion powder obtainable by this process, to an aqueous dispersion obtainable by step (1) of this process, and to a building material composition comprising the redispersible dispersion powder and/or the aqueous dispersion, to the use of the redispersible dispersion powder in a building material composition and to the use of the aqueous dispersion for production of a redispersible dispersion powder.
Claims10
A process comprising:
- (1) mixing, to obtain a first aqueous dispersion, at least
- (i) a second aqueous dispersion, where the second aqueous dispersion comprises particles, where the particles comprise at least one polymer I, where the at least one polymer I comprises monomer units formed from at least one ethylenically unsaturated monomer;
- and
- (ii) a polyacid II comprising monomer units formed from methyl-2-propene-1-sulfonic acid,
- and
- at least one further ethylenically unsaturated monomer selected from the group consisting of acrylic acid, methacrylic acid, maleic acid, itaconic acid, salts thereof, and mixtures thereof;
- and
- wherein, in (1), an additive comprising a polyoxyalkylene group is present, wherein the additive is
- (a) mixed as a further component in the mixing, or
- (b) applied by emulsion polymerization to a surface of the particles prior to the mixing, or
- (c) incorporated as a monomer unit into the at least one polymer I of the particles prior to the mixing;
- and wherein the first aqueous dispersion has a pH of <4;
- and
- (2) drying the first aqueous dispersion in order to obtain the redispersible dispersion powder.
11 more elements
Dependencies are inferred from the claim text.