Microencapsulated agricultural chemical and process of preparati

Details Microencapsulated agricultural chemical and process of preparati Microencapsulated agricultural chemical and process of preparati

1982-07-23

1985-12-10

Lovering, Richard D.

Chemistry: fertilizers

Processes and products

Forms or conditioning

71118, 264 47, 424 19, 424 32, 42721334, 42840221, 42840224, 514936, A01N 3700, A01N 3718, A01N 2528, B01J 1302

Patent

active

045577552

ABSTRACT:
A microencapsulated agricultural chemical comprises an agricultural chemical as an active ingredient having a solubility of not more than 1 g in 100 ml of water at 20.degree. C. and vapor pressure of not more than 760 mmHg at 60.degree. C. and a microcapsule wall enclosing the agricultural chemical therein and the microcapsule wall comprises a water-soluble cationic urea resin and at least one of prepolymer composed of formaldehyde and at least one compound selected from the group consisting of urea, melamine and thiourea. The microcapsule is prepared by dispersing the agricultural chemical in an aqueous medium containing the water-soluble cationic urea resin, an anionic surfactant and at least one of the prepolymer and maintaining pH of the obtained dispersion within an acidic range to polycondense the water-soluble cationic urea resin and at least one of the prepolymers.

REFERENCES:
patent: 3074845 (1963-01-01), GEary
patent: 3516941 (1970-06-01), Matson
patent: 3607775 (1971-09-01), Yoshida et al.
patent: 3778383 (1973-12-01), Schibler et al.
patent: 4105823 (1978-08-01), Hasler et al.
patent: 4223060 (1980-09-01), Raine et al.
patent: 4460722 (1984-07-01), Igarashi et al.

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