Encapsulation process

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B - Operations, Transporting

41

L

42/15

B41L 1/36 (2006.01) B01J 13/16 (2006.01) B41M 5/165 (2006.01)

Patent

CA 1141956

ENCAPSULATION PROCESS Gerhart Schwab and Gerald T. Davis Abstract of Disclosure A process for the preparation of oil-containing microcapsules by interfacial condensation of a polyfunctional amine with a poly- functional wall-forming material is disclosed. Microcapsules produced by this process have utility in the manufacture of carbonless copy paper. The process comprises emulsifying a mixture of a hydro- phobic phase, which includes an oil, a chromogenic material and an oil soluble polyfunctional wall-forming material and a hydrophilic phase, which includes water, a water soluble emulsifying agent and a water soluble salt of the desired polyfunctional amine. The amine salt may be formed in situ in the hydrophilic phase before the emulsi- fication step. After emulsification, sufficient base is added to the ; emulsion to convert the polyfunctional amine salt to a polyfunctional amine and to neutralize acid formed during subsequent condensation reactions, thus initiating the reaction of the polyfunctional amine with the oil soluble polyfunctional wall-forming material and thus forming microcapsule walls around droplets of the hydrophobic phase.

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