POLYAMIDE MICROCAPSULES
The invention relates to polyamide microcapsules having a mean diameter in the range of from 0.1 to 5 mm. The inventive polyamide microcapsules are obtainable by (a) producing an aqueous phase in which (a1) diamines and (a2) anionic polymers and/or heteropolysaccharides are dissolved, (b) producing an oil phase in which (b1) dicarboxylic acid halides are dissolved, (c) contacting the two phases while forming a W/O emulsion so that polycondensation takes place on the interface and polyamide microcapsules are formed, (d) filtering off the polyamide microcapsules and washing them, (e) treating the polyamide microcapsules so purified with a calcium salt solution and solidifying them, and finally (f) again filtering off, washing and drying the solidified polyamide microcapsules.