Encapsulation process

Details Encapsulation process Encapsulation process

1980-06-02

1982-06-08

Lovering, Richard D.

Compositions

Preservative agents

Anti-corrosion

4283206, 428914, B01J 1302

Patent

active

043338496

ABSTRACT:
A process is disclosed for the manufacture of microcapsules which comprises the steps of preparing hydrophobic and hydrophilic phase components. The hydrophobic phase component comprises a homogeneous solution of an electron donating chromogenic material and a hydrophobic material. The hydrophilic phase component comprises a mixture of a regulating agent and water, the regulating agent being a starch material. The hydrophobic phase component is combined with a hydrophilic phase component to form an oil-in-water emulsion. The oil-in-water emulsion further contains aqueous solutions of urea, resorcinol and formaldehyde. The pH of the oil-in-water emulsion is adjusted to a level at which the capsule wall forming reaction is initiated by the addition of a catalyst. The temperature of the partially reacted oil-in-water emulsion is then elevated to from about 50.degree. C. to about 80.degree. C. and this temperature is maintained for a period of time sufficient to form discrete microcapsules characterized by being substantially impermeable to the hydrophobic emulsion component.

REFERENCES:
patent: 3754062 (1973-08-01), Kobayashi
patent: 4221710 (1980-09-01), Hoshi et al.
patent: 4251386 (1981-02-01), Saeki et al.

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