Microcapsules, a process for their preparation and their use

Details Microcapsules, a process for their preparation and their use Microcapsules, a process for their preparation and their use

B - Operations, Transporting

01

J

B01J 13/14 (2006.01) A01N 25/28 (2006.01) B01J 13/16 (2006.01)

Patent

CA 2086583

PH/5-18924/A/CGC 1598 Microcapsules, a process for their preparation and their use Abstract This invention relates to a process for encapsulation and particularly for the preparation of microcapsules having a capsule wall of a solid polymeric substance enclosing a water- immiscible material, which process comprises preparing a solution of a first reactive component required to form the capsule wall in the water-immiscible material, then dispersing the mixture in an aqueous medium containing a surfactant which is a salt of a partial ester of a styrene-maleic anhydride copolymer, to form an oil-in-water emulsion, and subsequently adding a second reactive component required to form the capsule wall which is complementary to the first one and reacts with it under the mixing conditions, whereby a solid polymeric wall is formed about the dispersed water-immiscible material. The resulting stable aqueous suspension of microcapsules can either be used directly or after dilution with water, or the microcapsules can be separated from the aqueous phase.

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