Idemitsu Kosan Company, Limited

Idemitsu, Kosan Kabushiki-kaisha

Yoshihiro Narita

Hideo Konuma

Norio Komori

Sanae Tagami

Shigeaki Mochizuki

Haruo Kobayashi

Kiyoshi Watanabe

Shigeru Kakimoto

Katsuharu Ogishima

Hideji Shiota

Hirosi Yamada

Hiroshi Nishitani

Takenori Asajima

A process is provided for preparing a polycarbonate composition with excellent weatherproof properties. The process comprises adding an ultraviolet absorbing compound having a hydroxy group which contributes at least partially to the molecular weight modifier to an oligomeric polycarbonate which is obtained by the reaction of a dioxy compound with phosgene, and then condensing said oligomeric polycarbonate to polymerize the same. The invention also concerns a process for preparing a polycarbonate with excellent weatherproof properties which process comprises introducing a dioxy compound in alkaline solution and an organic solvent for the polycarbonate into a tubular reactor continuously to form a turbulent flow, feeding phosgene concurrently to the reactor with cooling outside of the reactor to produce an oligomeric polycarbonate as the solution of organic solvent, adding an aqueous alkaline solution of dioxy compound, molecular weight modifier, which is contained at least in part ultraviolet absorbing compound having an hydroxy group, and catalyst selected from the group consisting of tertiary amine and quaternary ammonium salt and, if desired, antioxidant to said oligomeric polycarbonate solution and condensing said oligomeric polycarbonate to polymerize the same.

Process for the preparation of polycarbonate with weatherproof property

A method of producing polycarbonate powder comprises continuously mixing and kneading a polycarbonate solution while heating same, the kneading being accomplished by producing a limited 'to and fro' movement of the polycarbonate solution with the aid of a set of spiral blades mounted on rotating shafts in an elongated barrel.

Method for producing polycarbonate powder from a polycarbonate solution

A heat resistant and impact resistant polycarbonate having a narrow distribution of molecular weight is continuously produced by reacting chloroformate ester, prepared in advance by reacting alkaline solution of dioxy compound in a turbulent flow of the two solutions while cooling and subsequently reacting the mixture concurrently in a laminar flow after the viscosity of the mixture has become significant.

Process and apparatus for continuous production of polycarbonates

Compositions comprising a polycarbonate resin and a mixture of anthraquinone series colorants have excellent transparency.

Polycarbonate resin compositions with improved transparency

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Tokuyama, Japan

Yoshihiro Narita