Daicel Chemical Industries, Ltd.

Yoshiaki Okumura

Hajime Namikoshi

Shoji Watanabe

Kiyoshi Okitsu

Masahiro Asami

Masatoshi Mikumo

Tsuyoshi Sei

A process for preparing a graft polymer by subjecting a cyclic ester to ring-opening polymerization in the presence of a cellulose derivative in the presence of a ring-opening polymerization catalyst for the cyclic ester. The resulting graft polymer has high transparency, good film-formability and high solubility and can be suitably used as a novel polymer material.

Process for preparing novel graft polymer

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

Yoshiaki Okumura