PROCESS FOR MANUFACTURING POLYSILOXANE MICROCAPSULES THAT ARE FUNCTIONALIZED AND ARE NOT VERY POROUS.

摘要

The present invention relates to a process for encapsulating products that may exhibit lipophilic or hydrophilic properties, including volatile products, in a particularly leaktight polysiloxane membrane. It also proposes a method for evaluating the leaktightness of such capsules. This process comprises the following steps: a) -formation of droplets via an emulsion between an oily phase containing the product to be encapsulated and an acidic aqueous phase heated to around 50°C and in the presence of surfactants; b) -addition and hydrolysis of at least one silane in order to obtain a silanol; c) -increase of the pH in order to obtain a start of condensation of the silanol in order to form a first membrane around droplets of the product to be encapsulated; d) -lowering of the pH; e) -increase of the pH, optionally preceded by the addition of a silane, in order to obtain a new condensation of silanol around droplets of the product to be encapsulated.