Encapsulation by interfacial polycondensation of...

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B - Operations, Transporting

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167/4, 117/45.3

B01J 13/02 (2006.01) A01N 25/26 (2006.01) A01N 25/28 (2006.01) B01J 13/00 (2006.01) B01J 13/16 (2006.01) C08G 18/08 (2006.01) C08G 18/32 (2006.01) C08G 71/02 (2006.01) C08J 3/12 (2006.01) C08K 9/10 (2006.01)

Patent

CA 1165636

AG-1288 ENCAPSULATION BY INTERFACIAL POLYCONDENSATION 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 polyurea, which involves bringing together an aqueous phase containing a lignin sulfonate emulsifier and a water- immiscible phase containing a water-immiscible material, the material to be encapsulated, plus polymethylene polyphenylisocyanate, dispersing the water-immiscible phase in the aqueous phase followed by addition of a polyfunctional amine. Polymethylene polyphenylisocyanate reacts with the amine to form a solid polyurea shell wall about the encapsulated material. The capsules formed may be directly used as aqueous suspensions.

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