Invention Grant
- Patent Title: Production method of polycarbonate resin
- Patent Title (中): 聚碳酸酯树脂的生产方法
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Application No.: US12519205Application Date: 2007-09-25
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Publication No.: US07985823B2Publication Date: 2011-07-26
- Inventor: Kazuyuki Takahashi , Kouji Iwaki , Ryuuji Uchimura
- Applicant: Kazuyuki Takahashi , Kouji Iwaki , Ryuuji Uchimura
- Applicant Address: JP Tokyo
- Assignee: Mitsubishi Chemical Corporation
- Current Assignee: Mitsubishi Chemical Corporation
- Current Assignee Address: JP Tokyo
- Agency: Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- Priority: JP2006-340464 20061218
- International Application: PCT/JP2007/068571 WO 20070925
- International Announcement: WO2008/075490 WO 20080626
- Main IPC: C08G63/02
- IPC: C08G63/02 ; C08G63/00

Abstract:
The invention aims at providing a process for the production of polycarbonate resin which is suppressed in discoloration and reduced in the content of crystalline foreign substance, gel, and so on. The invention relates to a process for the production of polycarbonate resin from raw materials, namely, an aromatic dihydroxyl compound and a carbonic diester through continuous transesterification by the use of a production unit provided with plural reactors, which comprises producing continuously an aromatic polycarbonate resin having a viscosity-average molecular weight of 10,000 to 20,000 for a prescribed time before the termination of the continuous transesterification, discharging the polymerization fluid, cleaning the insides of the reactors with a mixture of the raw materials and then with an aromatic monohydroxy compound, feeding the raw materials and a catalyst to the reactors after the internal temperatures and degrees of vacuum of the reactors have reached respectively to levels falling within −5% to +5% of the levels preset for manufacturing operation, and then initiating manufacturing operation again.
Public/Granted literature
- US20100036087A1 PRODUCTION METHOD OF POLYCARBONATE RESIN Public/Granted day:2010-02-11
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