Mitsubishi Gas Chemical Company, Inc.

Daicel Corporation

Hitachi Shipbuilding & Eng. Co., Ltd.

Hiroyuki Yoshizaki

Yoshitaka Masuda

Hiromitsu Takanohashi

Yukio Hozumi

Takeaki Megumi

Akira Ohi

Hiroyuki Koda

Yutaka Kojima

Shiro Tsuchiya

Yuzo Sonoyama

Kunio Hamaya

Takashi Ikeno

Shinichi Fukuda

Yuzo Toga

Sigeo Kondoh

A process for preparing polycarbonate oligomers by reacting phosgene with an alkaline aqueous solution containing an alkali metal salt or alkaline earth metal salt of a dihydric phenol in the presence of an inert organic solvent, which comprises previously cooling said alkaline aqueous solution to not higher than 0.degree. C., reacting the cooled aqueous solution with phosgene to perform a phosgenation reaction and also to absorb the heat of the phosgenation reaction by the quantity of heat that said cooled aqueous solution has, thereby to adjust the phosgenation reaction system substantially to not higher than 10.degree. C., and then oligomerizing the phosgenation product at a temperature of 15.degree. C. or higher.

Preparing polycarbonate oligomers by reacting phosgene with an aqueous

A process is disclosed for producing powdery polycarbonate from a polycarbonate solution which comprises:

Process for producing powdery polycarbonate from a polycarbonate solution

A process for producing polycarbonate oligomers by the reaction of dihydroxy compounds with phosgene, which comprises contacting a mixture of a dihydroxy compound and an aqueous alkali solution with phosgene in the presence of an organic solvent in a tubular reactor to perform a first-stage reaction, introducing the first-stage reaction mixture into a tank-type reactor equipped with a stirrer and containing the aqueous alkali solution and a solution in the organic solvent of a polycarbonate oligomer formed by the reaction of the first-stage reaction product in a second stage, and performing the second-stage reaction while stirring the reaction mixture in the tank-type reactor and maintaining it at a predetermined temperature by sufficient removal of the heat of reaction.

Process for producing polycarbonate oligomers

A polyfunctional organic compound, as a crosslinking agent, is used for producing a branched polycarbonate or poly(ester-carbonate).

Process for producing a branched polycarbonate or poly(ester-carbonate)

An impact-resistant, flame-retardant resin composition is disclosed comprising

Impact-resistant, flame-retardant resin composition

A flame retardant resin composition having a high impact resistance is disclosed, containing (A) 20 to 85 weight percent of a high molecular weight aromatic polycarbonate copolymer comprising (1) 2 to 30 molar percent of a bisphenol the nucleus of which is substituted with a halogen and (2) 70 to 98 molar percent of a halogen-free bisphenol and (B) 80 to 15 weight percent of an ABS resin comprising a mixture of (1) a graft copolymer of a butadiene-based rubbery polymer to which is grafted a vinyl aromatic hydrocarbon and acrylonitrile and and (2) a copolymer of a vinyl aromatic hydrocarbon and acrylonitrile. The amount of said rubbery polymer is 5 to 40 weight percent of the ABS resin.

Resin composition having high impact resistance

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Toyonaka, Japan

Hiroyuki Yoshizaki