Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Biocides; animal or insect repellents or attractants
Patent
1991-06-26
1993-01-12
Page, Thurman K.
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Biocides; animal or insect repellents or attractants
252302, 252304, 252308, 25231501, 2523155, 2523156, 2523157, 424 45, 514937, 514938, 514939, 514941, 514943, A01N 2502
Patent
active
051788713
ABSTRACT:
A preferred method of producing an aqueous, stable double emulsion is disclosed. The first step of the method is the production of an "inner" emulsion. The inner emulsion is produced by combining water, a liquid hydrocarbon solvent, and an emulsifier, in an agitated mixing vessel, along with an effective amount of finely-divided particulate material, to produce an oil-in-water emulsion having a viscosity of no more than about 200,000 centipoises, wherein the finely-divided particulate material is substantially homogeneously-dispersed throughout the thus-produced oil-in-water emulsion. The second step of the method is the production of an "outer" emulsion. The outer emulsion is produced by combining a liquid hydrocarbon solvent, water, and an emulsifier, in an agitated mixing vessel, to produce a water-in-oil emulsion. The third step of the method is the production of a "dual" emulsion. The dual emulsion is produced by combining the water-in-oil emulsion with an effective amount of the oil-in-water emulsion, in a mixing zone, thereby to produce the aqueous, stable double emulsion.
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Harrison Robert H.
Page Thurman K.
S. C. Johnson & Son Inc.
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