Asahi Kasei Kogyo Kabushiki Kaisha

Nobuyuki Shinmura

Sojiro Matsumoto

Kazurou Komatsu

Takeshi Maniwa

A process for the continuous production of a polyisocyanate by reacting an organic diisocyanate with an adduct-producing agent that reacts with an isocyanato group to form an intermediate product having a urea bond and a gas is disclosed wherein the initial stage of the reaction is performed in one or two continuous complete mixing type reactors until the amount of gas generated is at least about 80% of the amount of gas to be generated during the entire reaction and the subsequent stage of the reaction is performed in a plug flow reactor.

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Hyuga, Japan

Nobuyuki Shinmura