Process for producing multiple types of microcapsules

Details Process for producing multiple types of microcapsules Process for producing multiple types of microcapsules

B - Operations, Transporting

01

J

117/45.3

B01J 13/02 (2006.01) A01N 25/28 (2006.01) B01J 13/16 (2006.01)

Patent

CA 1245917

PR-4694 PROCESS FOR PRODUCING MULTIPLE TYPES OF MICROCAPSULES Abstract of the Disclosure A process of encapsulating water-immiscible material within dis- crete capsules of polyurea without addition of a second reactant, whereby hydrolysis of an isocyanate monomer to form an amine takes place, which in turn reacts with another isocyanate monomer to form polyurea, which com- prises the steps of (a) providing at room temperature, a dispersion of (i) a plurality of water-immiscible phases, each phase com- prising the water-immiscible material to be encapsulated and at least one organic polyisocyanate in (ii) an aqueous phase comprising a solution of water, a sur- factant and a protective colloid; and (b) heating and maintaining said dispersion in a temperature range of about 40°C to about 90°C, whereupon said water-immiscible materi- al is encapsulated within discrete polyurea capsular enclosures directly usable without further separation or purification.

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