| 摘要 |
<p>ENCAPSULATION PROCESS Gerhart Schwab and Gerald T. Davis A process for the preparation of oil-containing microcapsules by interfacial condensation of a polyfunctional amine with a polyfunctional 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 hydrophobic 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 emulsification 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.</p> |
