Method of making oil-containing microcapsules

Details Method of making oil-containing microcapsules Method of making oil-containing microcapsules

1978-03-31

1980-08-26

Lovering, Richard D.

Compositions

Preservative agents

Anti-corrosion

282 275, 428307, 428914, B01J 1302

Patent

active

042194393

ABSTRACT:
The method of making oil-containing microcapsules comprises the steps of (1) preparing an aqueous system comprising an aqueous solution of at least two kinds of hydrophilic colloid materials with opposite electric charges and oil droplets dispersed in said solution (2) causing coacervation in said aqueous system at a temperature above the gelation points of said hydrophilic colloid materials to form a coacervate suspension in which each of said oil droplets is surrounded by a coacervate and (3) cooling said coacervate suspension to a temperature below the gelation points of said hydrophilic colloid materials to form multi-nucleus capsules. During the step of cooling the coacervate suspension, aggregation of particles of oil droplets each having a coacervate therearound is controlled by an agitation flow so as to allow formation of multi-nucleus microcapsules having an average diameter within the range of 3 to 20 microns. Aggregation of particles of oil droplets each having a coacervate therearound is controlled by an agitation flow produced by rotating at least one agitator in a vessel containing the coacervate suspension under the special conditions.

REFERENCES:
patent: 3016308 (1962-01-01), Macaulay
patent: 3041289 (1962-06-01), Katchen et al.
patent: 3415758 (1968-12-01), Powell et al.
patent: 3687865 (1972-08-01), Katayama et al.
patent: 3738857 (1973-06-01), Brockett et al.

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