Kanegafuchi Kagaku Kogyo Kabushiki Kaisha

Koji Iritani

Nobutaka Tani

Yoshiaki Yano

Shigeki Masuda

Tetsuya Kawasaki

A polyester represented by the following general formula (I) and a copolymer which comprises two structural units represented by the following general formulae (I') and (II). ##STR1## and a coating material for use in large intestine-selective drug release pharmaceutical preparations, which contains the above polyester and/or copolymer. The polyester and copolymer of the present invention contain a saccharide residue which is hydrolyzed and/or assimilated specifically in the large intestine, drugs contained in solid oral pharmaceutical administration pharmaceutical preparations coated with the coating material of the present invention are not decomposed or absorbed by digestive organs other than the large intestine, but instead are released selectively and therefore in a high concentration in the large intestine.

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Hyogo, Japan

Koji Iritani