Microencapsulated agriculturally active material

Details Microencapsulated agriculturally active material Microencapsulated agriculturally active material

A - Human Necessities

01

N

167/13, 71/47, 7

A01N 31/00 (2006.01) A01N 25/26 (2006.01) A01N 25/28 (2006.01) A01N 33/18 (2006.01)

Patent

CA 2007320

"MICROENCAPSULATED AGRICULTURALLY ACTIVE MATERIAL" Abstract of the Invention Agriculturally active materials, such as pesticides, herbicides and the like and a process for microencapsulating said materials. The present invention includes trifluralin having a polymorphic form characterized by a yellow color and a melting point of approximately 41'- 43°C. The present invention also includes a method of using the yellow polymorphic form of trifluralin as a herbicide. In addition, the present invention includes a method of microencapsulating low-melting agriculturally active materials, such as trifluralin. The microencapsulation process comprises the steps of heating a low-melting, water-immiscible, agriculturally active material to a molten state. The molten active material is then combined with an aqueous solution of a water-soluble, film-forming polymer at a temperature sufficient to maintain the active material in its molten state. The active material is then dispersed or emulsified in the aqueous solution so that the active material has a primary particle size of between approximately 0.1 and 10 microns. The resulting dispersion or emulsion is then spray dried at a temperature between approximately 50° and 220°C. so as to microencapsulate the active material in the polymer. Compounds for promoting the rapid solidification of the active material are also disclosed.

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