Tanabe Seiyaku Company, Limited

Akira Kida

Masayoshi Samejima

Goichi Hirata

Yoshiyuki Koida

Yoshinori Kobayashi

Pharmaceutically active compound-containing microcapsules the coating walls of which consist essentially of ethylcellulose and a water-insoluble, acid-soluble polymer material are disclosed. A method of preparing said microcapsules is also disclosed.

Process for preparing ethylcellulose microcapsules

Ethylcellulose microcapsules, wherein a polymer material which shows at least 1.2 times increase in weight by immersing it in water at 37.degree. C. is incorporated into the ethylcellulose coating walls and/or the core material thereof, are disclosed. Said ethylcellulose microcapsules show rapid release of the core material in digestive organs such as stomach.

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Settsu, Japan

Akira Kida