Chemistry: fertilizers – Processes and products – Organic material-containing
Patent
1984-01-03
1985-08-13
Dixon, Jr., William R.
Chemistry: fertilizers
Processes and products
Organic material-containing
71 6411, 264 4, 264 41, 264 47, B01J 1302
Patent
active
045347832
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 organic liquid (continuous phase liquid) containing an oil soluble alkylated polyvinylpyrrolidone emulsifier A discontinuous (aqueous) phase liquid containing a water-soluble material, which is the material to be encapsulated, plus a first shell wall component; is dispersed in the continuous phase liquid to form a water-in-oil emulsion. The second shell wall component is added to the water-in-oil emulsion whereupon the first shell wall component reacts with the second shell wall component to form a solid polymeric shell wall about the material to be encapsulated. The capsules formed may be directly used as in the form of an organic suspension, i.e., a suspension of microcapsules in the organic liquid.
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Coburn Patricia A.
Dixon Jr. William R.
Johnson C.
Monsanto Co.
Shear Richard H.
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