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OwnerJuergen Dombrowski, Hartmut Kuehn +2inventors
InventorsJuergen Dombrowski, Hartmut Kuehn, Margarita Perello, Sonja Scharlemann
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Powdered polyurethane flexible foams, preferably powdered recycled polyurethane flexible foams are used with a redispersible polymer powder (RDP), preferably as a preblended additive, in hydraulic binders or cementitious compositions to improve performance of cementitious compositions or mortar, in applications such as cement based tile adhesives (CBTA), or external thermal insulating composite systems (ETICS). The use of the powdered polyurethane flexible foam as a partial replacement for an RDP unexpectedly provides an increase in wet mortar density while maintaining excellent workability and quick open time, quicker setting times, improved impact resistance, and increased adhesion after water immersion.
An additive for a hydraulic binder, the additive comprising a preblend of a powdered polyurethane flexible foam and a water redispersible polymer powder (RDP), said water redispersible polymer powder comprising a water insoluble film-forming polymer, the amount of the powdered polyurethane flexible foam being from 10% by weight to 80% by weight, based upon the total weight of the powdered polyurethane flexible foam and the water redispersible polymer powder.
A method for producing an additive for a hydraulic binder comprising dry blending a powdered polyurethane flexible foam and a water redispersible polymer powder (RDP), said water redispersible polymer powder comprising a water insoluble film-forming polymer, the amount of the powdered polyurethane flexible foam being from 10% by weight to 80% by weight, based upon the total weight of the powdered polyurethane flexible foam and the water redispersible polymer powder, the powdered polyurethane flexible foam having an average particle size of from 5 microns to 500 microns, and the redispersible polymer powder having an average particle size of from 5 to 150 microns.
A method for making a hydraulic binder comprising admixing cement ingredients with a powdered polyurethane flexible foam and a water redispersible polymer powder (RDP), said water redispersible polymer powder comprising a water insoluble film-forming polymer, the amount of the powdered polyurethane flexible foam being from 10% by weight to 80% by weight, based upon the total weight of the powdered polyurethane flexible foam and the water redispersible polymer powder.
A dry mix composition comprising cement ingredients, a powdered polyurethane flexible foam, and a water redispersible polymer powder (RDP), said water redispersible polymer powder comprising a co-dried admixture of a water insoluble film-forming polymer and a colloidal stabilizer, the amount of the powdered polyurethane flexible foam being from 10% by weight to 80% by weight, based upon the total weight of the powdered polyurethane flexible foam and the water redispersible polymer powder, and the total amount of the powdered polyurethane flexible foam and the water redispersible polymer powder being from 0.1% by weight to 10% by weight, based upon the weight of the dry mix formulation.
Dependencies are inferred from the claim text.