Process for the preparation of microcapsules

Details Process for the preparation of microcapsules Process for the preparation of microcapsules

1988-06-07

1990-07-03

Raymond, Richard L.

Chemistry: fertilizers

Processes and products

Forms or conditioning

514 86, 514 93, 514122, 514134, 514147, 514144, 514148, 514256, 514365, 514383, 514469, 514473, 514352, 514513, 514726, 514433, 514625, 514755, 514431, 514637, 514646, 71 88, 71 92, 71 93, 71 94, 71 98, 71114, 71100, 71120, 71121, 71124, 71126, 71DIG1, A01N 3718, A61K 31675

Patent

active

049387979

ABSTRACT:
The invention relates to a process for the preparation of microcapsules having a capsule wall of polyurea and encapsulating a water-immiscible pesticide. The process comprises first dispersing a solution of a polyisocyanate in the sparingly water-soluble pesticide, in the presence of an anionic dispersant and at least one nonionic protective colloid and/or a nonionic surfactant, and subsequently reacting the dispersion with a polyamine, to give a stable aqueous suspension of microcapsules which can be used either direct or after dilution with water as pesticidal composition.

REFERENCES:
patent: 4230809 (1980-10-01), Heinrich et al.
patent: 4280833 (1981-07-01), Beestman et al.
patent: 4285720 (1981-08-01), Scher
patent: 4303548 (1981-12-01), Shimazaki et al.
patent: 4417916 (1983-11-01), Beestman et al.
patent: 4563212 (1986-01-01), Becher et al.

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