MICROCAPSULES WITH ACETYLENE CARBAMIDE-POLYUREA POLYMERS AND COMPOSITIONS THEREOF FOR REGULAR RELEASE Russian patent published in 2012 - IPC C08G18/28 C08G18/38 C08G18/72 B01J13/16 A01N25/28 

FIELD: chemistry.

SUBSTANCE: invention relates to microcapsules used in agrochemical compositions as part of any type of composition used to in agriculture, as well for microencapsulation of pharmaceutical and medical compounds, flame-retardants, phase transition materials, thermosetting materials, ink and catalysts. The microcapsules contain a material with water solubility of less than 750 mg/l at 20°C. The wall of the microcapsules is formed via interphase polymerisation of materials which form the wall: (a) aliphatic isocyanate(s), and (b) aromatic isocyanate(s), and (c) compound(s) of formula (I), acetylene carbamide derivatives

,

where R₁, R₃, R₅, R₇ independently denote methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butylene, tert-butyl; R₂, R₄, R₆, R₈ independently denote hydrogen, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl; R₉, R₁₀ denote hydrogen or hydroxymethyl; including oligomeric forms of compounds (I), where the number of moles of compounds (I) ranges from 2 to 10; and the microcapsules have average diameter from 0.3 to 25 mcm when using a conventional laser diffraction analyser to measure particle size with preliminary conventional dissolution in water while stirring. The invention also describes a method of producing an agrochemical composition of a typical encapsulated suspension, containing said microcapsules, and versions of using said microcapsules.

EFFECT: obtaining microcapsules with possibility of controlling the speed of release of the microencapsulated material, and improvement of the toxicological profile of the microcapsules and compositions containing said microcapsules.

12 cl, 12 ex, 13 dwg