Chemistry: fertilizers – Processes and products – Forms or conditioning
Patent
1989-01-24
1992-11-03
Raymond, Richard L.
Chemistry: fertilizers
Processes and products
Forms or conditioning
71100, 71103, 71108, 71DIG1, A01N 3306, A01N 3720, A01N 3734, A01N 4106
Patent
active
051605309
ABSTRACT:
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.degree.-43.degree. 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 soluion 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.degree. and 220.degree. 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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Bergman Elliot
Hoff, Jr. Edwin F.
LeFiles James H.
McKinney Larry J.
Misselbrook John
Clardy S. Mark
Griffin Corporation
Raymond Richard L.
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