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US 5,225,478 AGranted
Polymer powders which are redispersible in water and can be prepared by atomizing aqueous polymer dispersions, and their use as additives in hydraulic binders
AssigneeBASF SE
InventorsWilhelm F. Beckerle, Rolf Dersch, Gernot Franzmann, Brigitte Gareiss, Ludger Leber
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Abstract
Polymer powders which are redispersible in water and are obtainable by atomizing aqueous polymer dispersions to which from 3 to 50% by weight, based on the polymer, of a water-soluble alkali metal salt or alkaline earth metal salt of a phenolsulfonic acid/formaldehyde condensate has been added are used as additives in hydraulic binders.
Claims11
A polymer powder which is redispersible in water, said polymer powder being obtained by atomizing an aqueous polymer dispersion of:
- a polymer of olefinically unsaturated monomers having a glass transition temperature of from +50.degree. C. to -60.degree. C.;
- and
- from 3 to 50% by weight, based on the polymer, of a water-soluble alkali metal salt or alkaline earth metal salt of a phenolsulfonic acid/formaldehyde condensate.
A method of modifying a hydraulic binder comprising cement, said method comprising:
- mixing from 5 to 30% by weight, based on said cement, of a polymer powder which is redispersible in water with said cement,
- wherein said polymer powder is obtained by atomizing an aqueous polymer dispersion of:
- a polymer of olefinically unsaturated monomers having a glass transition temperature of from +50.degree. C. to -60.degree. C.;
- and
- 3 to 50% by weight, based on the polymer of a water-soluble alkali metal salt or alkaline earth metal salt of a phenolsulfonic acid/formaldenhyde condensate.
2 more elements
Dependencies are inferred from the claim text.