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    PROCESS FOR PRODUCING POLYCARBONATE
    2.
    发明申请
    PROCESS FOR PRODUCING POLYCARBONATE 审中-公开

    公开(公告)号：US20170349704A1

    公开(公告)日：2017-12-07

    申请号：US15534995

    申请日：2015-12-10

    Applicant: IDEMITSU KOSAN CO., LTD.

    Inventor： Kenji SASAKI ,  Masayuki TAKAHASHI ,  Hiroaki MOTEGI

    IPC: C08G64/24 ,  C08G77/448 ,  C08G64/18

    CPC classification number: C08G64/24 ,  C08G64/186 ,  C08G77/448

    Abstract: A method of producing a polycarbonate, including: introducing a tertiary amine into a reaction process; and performing interfacial polycondensation between an alkali aqueous solution of a dihydric phenol and phosgene in the presence of an organic solvent, in which: (i) a portion into which the tertiary amine is introduced comprises at least a tertiary amine storage tank, a tertiary amine supply pipe, and a diluent solvent supply pipe; (ii) the portion further includes a pressure control valve in the tertiary amine supply pipe on an upstream side of a merging portion with the diluent solvent supply pipe; and (iii) when a pressure P1 of an inside of the tertiary amine storage tank pressurized by a pressurization gas and a pressure P2 in a portion ranging from an outlet of the storage tank to an upstream side of the pressure control valve, a relationship of P1≦P2 is satisfied.

    BRANCHED POLYCARBONATE PRODUCTION METHOD
    3.
    发明申请
    BRANCHED POLYCARBONATE PRODUCTION METHOD 审中-公开

    公开(公告)号：US20170313817A1

    公开(公告)日：2017-11-02

    申请号：US15523918

    申请日：2015-11-06

    Applicant: IDEMITSU KOSAN CO., LTD.

    Inventor： Noriyuki KUNISHI ,  Kazuhiro SEKIGUCHI ,  Yukiko NAGAO ,  Masayuki TAKAHASHI ,  Kenji SASAKI

    IPC: C08G64/24

    CPC classification number: C08G64/24 ,  C08G64/06

    Abstract: Provided is a method of producing a branched polycarbonate, including: a step (a) of subjecting an alkali aqueous solution of a dihydric phenol, phosgene, and a branching agent to a phosgenation reaction in the presence of an organic solvent to provide a reaction liquid; a step (b) of adding the alkali aqueous solution of the dihydric phenol and a polymerization catalyst to the reaction liquid obtained from the step (a) to provide a reaction liquid containing a polycarbonate oligomer; a step (c) of separating the reaction liquid containing the polycarbonate oligomer obtained in the step (b) into an organic solvent phase containing the polycarbonate oligomer and an aqueous phase; and a step (d) of causing the organic solvent phase containing the polycarbonate oligomer separated in the step (c) and the alkali aqueous solution of the dihydric phenol to react with each other to provide a reaction liquid containing the branched polycarbonate, in which a ratio (x/y) of an addition amount of the polymerization catalyst to be added in the step (b), which is represented by x mol/hr, to a chloroformate group amount of the polycarbonate oligomer in the reaction liquid obtained from the step (b), which is represented by y mol/hr, is 0.0035 or more.

    POLYCARBONATE-POLYORGANOSILOXANE COPOLYMER PRODUCTION METHOD
    4.
    发明申请
    POLYCARBONATE-POLYORGANOSILOXANE COPOLYMER PRODUCTION METHOD 审中-公开

    公开(公告)号：US20170327639A1

    公开(公告)日：2017-11-16

    申请号：US15532945

    申请日：2015-12-02

    Applicant: IDEMITSU KOSAN CO., LTD.

    Inventor： Kenji SASAKI ,  Akihiro SHISHIKURA ,  Noriyuki KUNISHI ,  Yukiko NAGAO

    IPC: C08G64/08 ,  C08G64/40

    CPC classification number: C08G64/085 ,  C08G64/186 ,  C08G64/24 ,  C08G64/406 ,  C08G77/06 ,  C08G77/448

    Abstract: A method of producing a polycarbonate-polyorganosiloxane copolymer, including: a step (a) of obtaining a solution containing a polycarbonate-polyorganosiloxane copolymer through use of an alkaline aqueous solution of a dihydric phenol, phosgene, a polyorganosiloxane, and an organic solvent; a step (b) of continuously or intermittently draining the solution containing the copolymer from step (a), followed by separation of the drained solution into an aqueous phase and an organic phase to provide the organic phase with copolymer; and a step (c) of concentrating the organic phase with the from step (b) to remove the organic solvent, before heating the organic phase to a boiling region in the step (c), a viscosity of the organic phase being adjusted to 70 cP or less at 35° C., the polycarbonate-polyorganosiloxane copolymer obtained by the steps (a) to (c) including a polycarbonate-polyorganosiloxane copolymer containing a specific polycarbonate block (A) and a specific polyorganosiloxane block (B).

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