Redispersible dispersion powder composition method for the production and use thereof
OwnerWolfgang Fiedler, Ulrich Geissler +1inventors
InventorsWolfgang Fiedler, Ulrich Geissler, Ludwig Schmitz
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Abstract
The present invention relates to a water-dispersible dispersion powder composition based on water-insoluble polymers, and comprising, based on the total weight of the polymer, from 0.1 to 30% by weight of at least one carboxylic ester whose alcohol component derives from the group consisting of the polyhydroxy compounds, and to a process for preparing the composition, and also to the use of the composition, in particular for reducing the water absorption of construction compositions.
Claims20
A dispersion powder composition based on water-insoluble polymers and comprising, based on the total weight of the polymer, from 0.1 to 30% by weight of at least one carboxylic ester whose alcohol component derives from the group consisting of the polyhydroxy compounds, and wherein the polymer is stabilized by means of protective colloids.
The dispersion powder composition as claimed in at least one of the preceding claims, wherein polyvinyl alcohol with a degree of polymerization of from 200 to 3 500 and a degree of hydrolysis of from 80 to 98 mol % is used as protective colloid for preparing the polymer.
The dispersion powder composition as claimed in at least one of the preceding claims, wherein the polyhydroxy component of the carboxylic ester derives from the group consisting of the sorbitans.
The dispersion powder composition as claimed in at least one of the preceding claims, wherein the acid component and the alcohol component contain halogens, hydroxyl groups, ether groups, thioether groups, ester groups, amide groups, carboxy groups, sulfonic acid groups, carboxylic anhydride groups, and/or carbonyl groups.
The dispersion powder composition as claimed in at least one of the preceding claims, wherein the carboxylic ester used comprises the appropriate monoester of the polyhydroxy compounds.
The dispersion powder composition as claimed in at least one of the preceding claims, wherein the carboxylic ester is added to the initial charge for the polymer a) needed for the preparation process.
The dispersion powder composition as claimed in at least one of the preceding claims, wherein aluminum silicate, calcium carbonate or magnesium carbonate or mixtures of these, silicas, or combinations of dolomite and, respectively, calcite and talc are used as anticaking agents.
The dispersion powder composition as claimed in at least one of the preceding claims, wherein the carboxylic acid has been applied to a pulverulent carrier material, with the proviso that this carrier material comprises from 10 to 160% by weight of carboxylic ester, based on the total weight of the carrier material.
The use of a dispersion powder composition based on water-insoluble polymers, which composition comprises, based on the total weight of the polymer, from 0.1 to 30% by weight of at least one carboxylic ester whose alcohol component derives from the group consisting of the polyhydroxy compounds, for hydrophobicizing mortar or concrete.
Dependencies are inferred from the claim text.