| abstract |
A dry powder consisting of an emulsion polymer of A) 20 to 85% by weight units of at least one alkyl ester of acrylic and / or methacrylic acid, B) 80 to 15% by weight units of at least one radically polymerizable monomer capable of salt formation, C) optionally up to 30 wt .-% units of one or more other free-radically polymerizable monomers, the powder granules of which are composed of loosely aggregated fine particles, is introduced into water and in the presence of an amount of an agent capable of salt formation with the monomer units B, so It is dimensioned that after their reaction with the monomer units B, a total of 1 to 10% by weight of these units, based on the weight of the copolymer, are present in the salt form, redispersed to at least 80% by weight to latex particles and, if appropriate, more conventionally after addition Excipients - applied to pharmaceutical forms as coating agents. |