Patent ID: 9334388
Filing Date: 2016-05-10
CPC Classification: C04B,C08J,C08K,C08L

Claim Text:
1. A water-redispersible polymer powder, comprising polymer particles prepared by emulsion polymerizing unsaturated monomers in an aqueous medium and spray drying a resulting polymer particle-containing aqueous medium containing from 3-30 weight percent based on polymer solids of protective colloid, and containing at least one gemini surfactant selected from the group consisting of alkynediols and alkynediol derivatives, the water-redispersible polymer powder further optionally comprising one or more antiblocking agents selected from the group consisting of calcium carbonate, magnesium carbonate, talc, gypsum, silica, kaolin, metakaolin, calcined kaolin, silicates, and mixtures thereof, wherein the polymer particles consist of polymerized residues of the unsaturated monomers, wherein the water-redispersible polymer powders redisperse in water to form dispersions containing polymer particles having particle sizes of from 0.1 μm to 5 μm, and wherein the water-redispersible polymer powder is suitable for adding to chemical building products containing hydraulically settable inorganic binders.