Method for improving the dispersion of redispersible polymer powders

摘要

The method according to the present invention includes the step of adding sufficient amounts of an alkalinizing agent to an aqueous solution into which a redispersible polymer powder will be dispersed or to an aqueous dispersion which will be dried to form a redispersible polymer powder. The method of the invention is particularly well suited for nonionic polymers. A surfactant, plasticizer and/or preservative can also be used in addition to the alkalinizing agent. Redispersible polymer powders processed according to the invention form acceptable tablet coatings which are comparable in quality to those coatings formed from aqueous polymer dispersions that have not been dried into redispersible polymer powders.