Patent ID: 6528473
Filing Date: 2003-03-04
Classification: C11D

Abstract:
Water-dispersible dry solid granules of a system comprising particles comprising at least one hydrophobic organic active material encapsulated in solid particles of an alkali-water-soluble organic polymer obtained by emulsion polymerization of at least one ethylenically unsaturated anionic monomer which is a is an &agr;,&bgr;-ethylenically unsaturated carboxylic acid and which can undergo radical-mediated polymerization and of at least one ethylenically unsaturated nonionic comonomer which is an alkyl ester of &agr;,&bgr;-ethylenically unsaturated acid, and which can undergo radical-mediated polymerization, the amount of said anionic monomer(s) representing at least 10%, by weight of the total amount of monomers, said particles being dispersed in and encapsulated by a matrix made of at least one water-soluble or water-dispersible dry solid organic compound which is a surfactant whose water-surfactant binary phase diagram comprises an isotropic phase which is fluid at 25Â° C. up to a concentration of at least 50% by weight of surfactant, followed by a rigid liquid crystal phase of hexagonal or cubic type at higher concentrations, which is stable at least up to 60Â° C., at least 0.1% by weight of at least one emulsifier relative to the weight of said alkali-water-soluble copolymer being present at the interface: matrix particles of the system.