Formulation process

Details Formulation process Formulation process

1988-01-13

1989-10-24

Mills, Catherine L.

Chemistry: fertilizers

Processes and products

Forms or conditioning

71 92, 71DIG1, H01N 2532

Patent

active

048759279

ABSTRACT:
A process of preparing a herbicidal emulsion comprising 75 grams per liter or more of a salt of a herbicidal bipyridylium diquaternary cation as an active ingredient comprising as a first step agitating an aqueous solution of a herbicidal bipyridylium diquaternary salt with an oil and a first emulsifier having a low HLB value to give a first emulsion comprising droplets of herbicidal bipyridylium diquaternary salt solution dispersed in a continuous oil phase, and as a second step, agitating the first emulsion with water and a second emulsifier having a high HLB value, to give a second emulsion comprising drops of the first emulsion dispersed in a continuous aqueous phase. The emulsions have a lower oral toxicity than conventional aqueous formulations.

REFERENCES:
patent: 3479176 (1969-11-01), Wilson
patent: 4075005 (1978-02-01), Knowles et al.
patent: 4115098 (1978-09-01), Stull
patent: 4244816 (1981-01-01), Vogler et al.
patent: 4385049 (1983-05-01), Cuca
patent: 4446051 (1984-05-01), Berthod et al.
Journal of Controlled Release, 3, (1986), May, No. 4, Amsterdam, Netherlands "Stabilisation of W/O/W Multiple Emulsions by Interfacial Complexation . . . ".
Asher et al., "Liquid Membrane Capsule System for the Treatment of Chronic Uremia", May 10, 1974.

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