Chemistry: fertilizers – Processes and products – Forms or conditioning
Patent
1984-06-12
1987-02-03
Lovering, Richard D.
Chemistry: fertilizers
Processes and products
Forms or conditioning
71 93, 71118, 71120, 71121, 71DIG1, 264 47, 424 19, 424 32, 42840221, A01N 3718, A01N 3722, B01J 1302
Patent
active
046407090
ABSTRACT:
This invention relates to a process for encapsulation, and particularly to the production of small or minute capsules constituted by a skin or thin wall of polymeric material e.g., polyurea, polyamide, polysulfonamide, polyester, polycarbonate, or polyurethane, which involves first providing an aqueous solution (continuous phase liquid) containing an emulsifier which is a water soluble, alkylated polyvinyl pyrrolidone polymer which will form a stable oil-in-water emulsion under the process conditions described herein. A discontinuous (immiscible or organic) phase liquid containing a water-immiscible material which is the material to be encapsulated, plus a first shell wall component; is dispersed in the aqueous liquid to form an oil-in-water emulsion. The second shell wall component is added to the oil-in-water emulsion whereupon the first shell wall component reacts with the second shell wall component to form a solid polycondensate shell wall about the material to be encapsulated. The capsules formed may be directly used as in the form of an aqueous suspension.
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P. W. Morgan, "Interfacial Polycondensation, a Versatile Method of Polymer Preparation", Society Plastics Engineers Journal 15, pp. 485-495, (1959).
Asaji Kondo, "Microcapsule Processing and Technology", pp. 35-45, (1979).
Coburn Patricia A.
Lovering Richard D.
Martin Robert B.
Monsanto Company
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