Patent ID: 6281282
Filing Date: 2001-08-28
Classification: A61K,A61Q,C08J

Abstract:
A process for preparing polymer powders redispersible in aqueous solution which comprisespreparing a first dispersion of copolymers carrying free acid or base groups,adjusting the pH of said first dispersion by the addition of at least one buffer system to a pH of from 2.0 to 6.5, in the case of copolymers carrying acid groups, or to a pH of 7.5 to 12, in the case of copolymers carrying base groups,whereby some of the free acid or base groups are converted to salts thereof forming a second dispersion,and drying said second dispersion to obtain said polymer powders redispersible in aqueous solution,optionally, with the addition of auxiliaries prior to or after drying said second dispersion.