Method of making oil-containing microcapsules

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

1978-03-31

1980-09-16

Lovering, Richard D.

Compositions

Preservative agents

Anti-corrosion

282 275, 428307, 428914, B01J 1302

Patent

active

042228913

ABSTRACT:
The method of making oil-containing microcapsules comprises the step of (1) preparing an aqueous system comprising an aqueous solution of gelatin and at least one anionic colloid material and oil droplets dispersed in said solution (2) causing coacervation in said aqueous system at a temperature above the gelation point of said gelatin 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 gelatin 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. The gelatin has an average viscosity not larger than 35 millipoise in terms of the value measured by the bloom type pipette method at 40.degree..+-.0.5.degree. C. according to Japan Industrial Standard K 6503 with respect to a 62/3% aqueous solution of said gelatin at the pH of 4.5 and at least 5% by weight of said gelatin has a viscosity not larger than 25 millipoise in said terms and/or the anionic colloid material is a carboxymethylcellulose having a viscosity within the range of 2 to 500 centipoise measured by the Brookfield viscometer with a 60 r.p.m. No. 1 rotor with respect to a 2% aqueous solution of said carboxymethylcellulose at 25.degree. C.

REFERENCES:
patent: 2886446 (1959-05-01), Kramer et al.
patent: 3041289 (1962-06-01), Katchen et al.
patent: 3687865 (1972-08-01), Katayama et al.
patent: 3738857 (1973-06-01), Brockett et al.

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