Process for the preparation of microcapsules

Details Process for the preparation of microcapsules Process for the preparation of microcapsules

A - Human Necessities

01

N

A01N 25/28 (2006.01) A01N 25/30 (2006.01) B01J 13/02 (2006.01) B01J 13/16 (2006.01) C05G 3/00 (2006.01)

Patent

CA 2115119

The invention relates to a process for the preparation of an aqueous suspension of microcapsules having a capsule wall of polyurea and encapsulating a water- immiscible pesticide, by dispersing a solution of a polyisocyanate in the sparingly water- soluble pesticide in water and subsequently reacting the dispersion with a polyamine, which process comprises effecting the dispersion of the solution of the polyisocyanate in the sparingly water-soluble pesticide in water and the subsequent reaction of the dispersion with the polyamine in the presence of at least one water-soluble or water- dispersible nonionic surfactant of a block copolymer having at least one hydrophobic block and at least one hydrophilic block.

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