Chemistry: fertilizers – Processes and products – Forms or conditioning
Patent
1981-07-22
1983-11-29
Lovering, Richard D.
Chemistry: fertilizers
Processes and products
Forms or conditioning
71 3, 71 6411, 71 90, 71100, 71110, 71118, 71120, 71121, 71DIG1, 264 47, 424 19, 424 32, 4284022, A01N 4348, A01N 4364, A01N 3718, B01J 1302
Patent
active
044179162
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 polyurea, which involves bringing together an aqueous phase containing a lignin sulfonate emulsifier and a water-immiscible phase containing a water-immiscible material, the material to be encapsulated, plus polymethylene polyphenylisocyanate, dipersing the water-immiscible phase in the aqueous phase followed by addition of a polyfunctional amine. Polymethylene polyphenylisocyanate reacts with the amine to form a solid polyurea shell wall about the encapsulated material. The capsules formed may be directly used as aqueous suspensions.
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Beestman George B.
Deming John M.
Coburn Patricia A.
Lovering Richard D.
Monsanto Company
Shear Richard H.
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