Mitsubishi Chemical Industries Limited

Mitsubishi Kasei Corporation

Isao Akihara

Katsuyuki Sakata

Mitsuhiko Tamura

Shinichiro Koga

Akira Matsuno

Yoshiaki Ohtani

A process for producing an aromatic polycarbonate in a water-in-oil emulsified form, having an improved heat stability during molding at a high temperature, is described. In the process according to the present invention, a tertiary amine is added to the water-to-oil emulsion after the average diameter of liquid droplets of the water phase is reduced to not more than 10.mu.m. The polycarbonate obtained by the process of the present invention is improved in heat stability and can provide a molded article with less coloration.

Water-in-oil emulsion process for producing an aromatic polycarbonate

Disclosed herein is a process for producing a resin having carbonate bonding, comprising polymerizing a hydroxydiaryl compound and phosgene in an organic solvent of methylene chloride such that the concentration of carbon tetrachloride in phosgene and methylene chloride in the polymerization system satisfies the following equation:

Preparation with controlled amounts of polycarbonate carbon tetrachloride

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Kitakyushu, Japan

Isao Akihara