Process for the preparation of pharmaceutical substance-containing microcapsules

摘要

A process for the preparation of pharmaceutical substance-containing microcapsules by liquid-liquid phase separation is disclosed. In this process, ethyl cellulose having an ethoxy content of about 48 to about 49.5% by weight is used as a wall-forming agent and polyisobutylene is used as a phase separation inducing agent, and both or either one of the ethyl cellulose and polyisobutylene are used in the form of a mixture of two kinds differing in the average molecular weight.