Teijin Limited

Other

Hidemi Takemoto

Katsushi Sasaki

Toru Sawaki

Keiichi Kaneko

Hiroaki Kaneko

Wataru Funakoshi

Masumi Hirata

Masasi Simonaru

Masanori Abe

Jyuhou Matsuo

Yoshiki Matsuoka

An aromatic polycarbonate having excellent color is obtained by keeping an aromatic dihydroxy compound and a carbonic acid diester which are raw materials for the production of an aromatic polycarbonate in consideration of the influences of storage atmosphere, temperature, temperature difference from a storage tank and residence time.

Method for producing an aromatic polycarbonate and method of keeping raw materials thereof

A method of cleaning the aromatic polycarbonate production unit with a carbonic acid diaryl ester at a temperature of 200 to 350&deg; C. in an inert gas atmosphere.

Process for producing a polycarbonate and method of cleaning a production unit

Aromatic polycarbonate having a reduced discoloration and improved heat stability, hue, etc. is provided by keeping a pressure in a raw material melting vessel and the linear velocity of a gas in a transporting piping in a specific range, keeping the concentration of a nitrogen-containing basic compound in a specific range, recycling a byproduct containing specific amounts of impurities, suppressing the amounts of a nitrogen-containing basic compound, metallic elements and a silicic acid derivative in the carbonic acid diester at specific values or less, prescribing the material quality of the reaction facilities, and/or forming an oxide layer at the inner wall surfaces of the reaction facilities.

Carbonic acid diester, aromatic polycarbonate and facilities, and preparation thereof

A process for producing an aromatic polycarbonate through an ester interchange reaction between an aromatic carbonic acid diester and an aromatic dihydroxy compound, wherein the aromatic carbonic acid diester is obtained through the decarbonylation reaction of an aromatic oxalic acid diester represented by the following general formula (1):

Process for the preparation of aromatic polycarbonate

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Iwakuni, Japan

Hidemi Takemoto