High concentration encapsulation of water soluble materials

Details High concentration encapsulation of water soluble materials High concentration encapsulation of water soluble materials

B - Operations, Transporting

01

J

71/41, 400/5052,

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

Patent

CA 1224298

HIGH CONCENTRATION ENCAPSULATION OF WATER SOLUBLE MATERIALS ABSTRACT OF THE DISCLOSURE This invention relates to a process for encapsulation, and particularly to the production of small or minute capsules constituted by a skin or thin wall of polymeric material e.g., polyurea, polyamide, polysulfonamide, polyester, polycarbonate, or poly- urethane, which involves first providing an organic liquid (continuous phase liquid) containing an oil soluble alkylated polyvinylpyrrolidone emulsifier A discontinuous (aqueous) phase liquid containing a water-soluble material, which is the material to be encapsulated, plus a first shell wall component; is dispersed in the continuous phase liquid to form a water-soluble emulsion. The second shell wall compo- nent is added to the water-in-oil emulsion whereupon the first shell wall component reacts with the second shell wall component to form a solid polymeric shell wall about the material to be encapsulated. The capsules formed may be directly used as in the form of an organic suspension, i.e., a suspension of microcapsules in the organic liquid.

469612

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