Encapsulation process

Details Encapsulation process Encapsulation process

B - Operations, Transporting

01

J

42/15, 167/168

B01J 13/02 (2006.01) B01J 13/18 (2006.01) B41M 5/165 (2006.01)

Patent

CA 1153887

ABSTRACT OF THE DISCLOSURE A process is disclosed for the manufacture of microcapsules which comprises the steps of preparing hydrophobic and hydrophilic phase components. The hydrophobic phase compo- nent comprises a homogeneous solution of an electron donat- ing chromogenic material and a hydrophobic material. The hydrophilic phase component comprises a mixture of a regu- lating 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°C to about 80°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.

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