Microencapsulated compositions

Details Microencapsulated compositions Microencapsulated compositions

B - Operations, Transporting

01

J

B01J 13/16 (2006.01) A01N 25/28 (2006.01) A01N 43/40 (2006.01) A01N 53/00 (2006.01)

Patent

CA 2255852

Polyurea microcapsules particularly suitable for foliar application are prepared by an interfacial polymerization process in which the polyurea is formed from an aromatic diisocyanate and optionally an aromatic polyisocyanate having 3 or more isocyanate groups, in a weight ratio (when both types of isocyanate are present) of polyisocyanate:diisocyanate of from about 1:100 to about 1:15, and in which the microcapsules are produced having an average particle size of from about 1 to about 5 microns. As compared to conventional liquid (e.g., emulsifiable concentrate) compositions of pesticides, the microcapsules can provide safer handling and higher loading of active ingredients, while providing substantially equivalent biological activity to the liquid compositions.

Des microcapsules de polyurée convenant tout particulièrement à une application foliaire sont préparées par un procédé de polymérisation interfaciale dans lequel la polyurée est constituée à partir d'un diisocyanate aromatique et, éventuellement, d'un polyisocyanate aromatique ayant au moins 3 groupes isocyanate, le rapport de poids (en présence des deux types d'isocyanate) polyisocyanate: diisocyanate étant compris entre environ 1:100 et environ 1:15; et dans lequel les microcapsules produites ont des particules dont la taille moyenne est comprise entre environ 1 et environ 5 microns. Comparées aux compositions liquides classiques de pesticides (par exemple, un concentré émulsionnable), les microcapsules peuvent offrir une manipulation plus sûre et un chargement plus élevé des ingrédients actifs, tout en offrant une activité biologique sensiblement équivalente à celle des compositions liquides.

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