Patent ID: 9586864
Date: 2017-03-07
CPC Classifications: C04B

Claim:
1. A pulverulent composition comprising, based on the overall mass of the composition: A) at least 20 wt % of a calcium sulfate-based binder and B) 0.01 to 4 wt % of at least one copolymer at least partially coating the binder, the copolymer obtained by a process comprising polymerizing a mixture of monomers comprising (I) at least one ethylenically unsaturated monomer which comprises at least one radical from the series carboxylic acid, carboxylic salt, carboxylic ester, carboxylic amide, carboxylic anhydride, and carboxylic imide and (II) at least one ethylenically unsaturated monomer having a polyalkylene oxide radical, wherein the pulverulent composition is produced by contacting a powder component comprising a calcium sulfate-based binder with a liquid hydrous component comprising less than 30 wt % of an organic solvent comprising B), wherein the liquid hydrous component is added in an amount of less than 20 wt %, based on the overall mass of the pulverulent composition, and wherein the pulverulent composition contains no hydraulic binder.