Process for the preparation of polyurethane microcapsules contai

Details Process for the preparation of polyurethane microcapsules contai Process for the preparation of polyurethane microcapsules contai

1998-03-30

1999-10-05

Levy, Neil S.

Drug, bio-affecting and body treating compositions

Preparations characterized by special physical form

Biocides; animal or insect repellents or attractants

424408, 514119, 264 47, 427212, A01N 2528

Patent

active

059620030

ABSTRACT:
The present invention relates to a process for the preparation of polyurethane microcapsules containing monocrotophos, which comprises of preparing a solution of diol or polyol having a molecular weight in the range of 200-2000, crosslinker, monocrotophos and a catalyst selected from amino or organometallic compounds; dispersing this solution into a dilute solution of stabilizer which consists of a block copolymer having the compositionally dissimilar segments where n and m segments are in between 30-115 and 10-60 units respectively, such that the sum of n and m does not exceed 175 units, in an aliphatic hydrocarbon; adding an isocyanate dropwise to this dispersion; agitating the mixture at 1000-1400 revolutions per minute for the first 6-8 hours and then at 500-800 revolutions per minute for an additional period of 14-18 hours at a temperature between 30.degree. to 40.degree. C. to permit the formation of polyurethane microcapsules; heating the dispersion for an additional period of 1-2 hours at a temperature not exceeding 50.degree. C.; filtering the microcapsules; washing the microcapsules with lower aliphatic hydrocarbon and drying the microspheres under vacuum at temperature between 20.degree. to 35.degree. C.

REFERENCES:
patent: 3577515 (1971-05-01), Uandegaer
patent: 3726804 (1973-04-01), Matsukawa et al.
patent: 4076774 (1978-02-01), Short
patent: 5603986 (1997-02-01), Yabuuchi et al.
DE1936748 Abstract of CAPLUS 72:91372, Jan. 1970.

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