Daicel Chemical Industries, Ltd.

Tsuyoshi Sei

Tatsuya Kanno

Hajime Namikoshi

Ikuo Takahashi

Kenichi Sasaki

Yoshiaki Okumura

Takeshi Matsumoto

Tsuyoshi Habe

An aromatic polycarbonate copolymer is useful for a substrate of an optical disk and is composed of 1 to 99 mole percent of the unit of 2,2-bis(4-hydroxy-3-tertiary-butyl-phenyl)propane, 99 to 1 mole percent of the unit of a comonomer selected from the group consisting of

Co-polycarbonate copolymer from 2,2-bis(4-hydroxy-3-tertiary butyl

A flavone glycoside having the formula is isolated from the natural source and is found to be effective to amelioration of the hemolinetic disturbance. ##STR1##

Flavone glycoside

Novel cellulose ester derivatives having good solubility which are useful for coating agent, thickening agent, protective colloid, etc.; and a method for the preparation of said cellulose ester derivatives wherein cellulose is reacted with a specific lactone such as glycolide, lactide or .epsilon.-caprolactone in a solvent and in the presence of a catalyst for esterification.

Cellulose ester derivatives and a process for the production thereof

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Himeji, Japan

Tsuyoshi Sei