Patent ID: 7744694

Claim:
A process for accelerating the setting of construction chemistry products containing hydraulically setting binders, comprising adding an accelerant composition containing a water-redispersible polymer powder composition consisting essentially of a) homo- or copolymers of one or more monomers selected from the group consisting of vinyl esters of unbranched or branched C 1-15 alkylcarboxylic acids, methacrylic esters and acrylic esters of C 1-15 alcohols, vinylaromatics, olefins, dienes, and vinyl halides, and one or more protective colloids, and optionally, one or more antiblocking agent(s), and b) one or more accelerant compounds selected from the group of alkali metal salts and alkaline earth metal salts of organic C 1-4 carboxylic acids, added to said water-redispersible polymer following polymerization, the accelerant(s) being present in an amount of from 3 weight percent to 20 weight percent based on the total weight of the redispersible powder composition.