REVERSE-PHASE MICROCAPSULES FOR ACTIVE INGREDIENTS, SIMPLIFIED PRODUCTION METHOD THEREOF AND COMBINED FORMULATIONS WDG-CS, ZC, EC-SC AND CX Russian patent published in 2012 - IPC C08G18/28 C08G18/38 B01J13/16 A01N25/28 

FIELD: chemistry.

SUBSTANCE: invention relates to reverse-phase microcapsules (RPµ) for regular release of water-soluble or dispersed compounds, preferably agricultural chemicals. The microcapsule has a polymer wall produced in situ from reaction of an oil-soluble material(s), selected from at least one of groups i) or ii), more preferably at least one of each group, and more preferably one of each group: (i) at least glycorulil resin, preferably tetra-butoxylated glycorulil resin; (ii) at least isocyanate, preferably aliphatic polyisocyanate resin; and if selected from both types, the ratio of ii) to i) is at most 20:1 and at least 1:2; and the average size of the microcapsules ranges from 0.1 mcm to 25 mcm, preferably 1-5 mcm, and 90 percentile of the size of the microcapsules is at most 100 mcm, preferably 50 mcm, when measuring dispersion in water using a laser diffraction analyser. The invention also describes a method of obtaining a dispersion of reverse-phase microcapsules (RPµ) and an agricultural chemical composition which is a dispersion obtained using said method. The invention also discloses agricultural chemical compositions containing said microcapsules, of the type of granules dispersed in water, ZC (suspension concentrate plus a capsule suspension), as well as an agricultural chemical composition consisting of a combination of an emulsion concentrate with a capsule suspension and a method of obtaining said agricultural chemical composition.

EFFECT: obtaining acceptable agricultural compositions using a reliable, simple and efficient reverse-phase microencapsulation method which enables formation of fine microcapsules with a very uniform particle size distribution and good composition characteristics overall.

20 cl, 11 ex, 4 dwg