Preparation of microcapsules using the n-butyl half-ester of PVM/MA coacervate system

The n-butyl half-ester of the polymer polyvinyl methyl ether maleic anhydride was used for the preparation of microcapsules applying a simple encapsulation process which is less difficult to control than other methods of phase separation encapsulation. The data demonstrated that the release of the drug from the microcapsules can be controlled by changing the ratio of the amount of the drug to shell substance.