<p>Polyamide microcapsules (A) of mean diameter 0.0001-5 mm produced by (a) preparing an aqueous phase (a1) containing a di- and/or tri-amine (I); (b) preparing an oil phase containing an oil body (b1), dicarboxylic acid chloride (b2) and tricarboxylic acid chloride (b3) and (c) contacting (a) and (b) to form an emulsion so that polycondensation occurs at the phase boundary. Independent claims are also included for: (1) preparing (A) as described; and (2) separate methods for preparing (A) of mean diameters 0.0001-0.1 and 0.1-5 mm.</p>
