Daicel Chemical Industries, Ltd.

Teruo Itokazu

Toyokazu Yagii

Hidetaka Kojima

Yasutaka Tanaka

Kiyokazu Murata

Kenji Oka

An aliphatic diisocyanate compound is prepared in a high yield by reacting dimethyl carbonate with an aliphatic diamine in the presence of an alkali catalyst to produce a corresponding urethane compound; and, within 48 hours after the completion of the preparation of the urethane compound, thermally decomposing the urethane compound under a reduced pressure of 1 to 700 Torr in a high-boiling-point solvent.

Process for preparation of isocyanate compounds

An aliphatic diisocyante compound is prepared in a high yield by reacting dimethyl carbonate with an aliphatic diamine in the presence of an alkali catalyst to produce a corresponding urethene compound; and, within 48 hours after the completion of the preparation of the urethane compound, thermally decomposing the urethane compound under a reduced pressure of 1 to 700 Torr in a high-boiling-point solvent.

Process for preparation of aliphatic diisocyanate compounds

A diisocyanate compound substantially free from chlorine is prepared by the following consecutive steps (1), (2) and (3):

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Hiroshima, Japan

Teruo Itokazu