Invention Grant
- Patent Title: Method for producing polycarbonate
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Application No.: US15314406Application Date: 2015-05-28
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Publication No.: US09988490B2Publication Date: 2018-06-05
- Inventor: Yukiko Nagao , Masayuki Takahashi , Kota Mabuchi
- Applicant: IDEMITSU KOSAN CO., LTD.
- Applicant Address: JP Tokyo
- Assignee: IDEMITSU KOSAN CO., LTD.
- Current Assignee: IDEMITSU KOSAN CO., LTD.
- Current Assignee Address: JP Tokyo
- Agency: Foley & Lardner LLP
- Priority: JP2014-113430 20140530
- International Application: PCT/JP2015/065388 WO 20150528
- International Announcement: WO2015/182700 WO 20151203
- Main IPC: C08G64/00
- IPC: C08G64/00 ; C08G64/16 ; C08J3/12 ; C08G64/40 ; B29B9/12 ; B29K69/00 ; B29K105/00

Abstract:
Provided is a method of producing a polycarbonate that enables efficient drying of a polycarbonate powder and has no risk of deteriorating the quality of a polycarbonate molded article to be obtained. The method of producing a polycarbonate includes: a step of causing an alkali aqueous solution of a dihydric phenol and phosgene to react with each other in the presence of an organic solvent to produce an organic solvent solution containing a polycarbonate; a powdering step of powdering the organic solvent solution containing the polycarbonate to provide a polycarbonate powder; and a pre-drying step of drying the polycarbonate powder to remove the remaining organic solvent, in which a drying temperature in the pre-drying step is set to a temperature lower than the glass transition temperature of the polycarbonate containing 1.5 mass % of the organic solvent by from 5° C. to 15° C.
Public/Granted literature
- US20170198091A1 METHOD FOR PRODUCING POLYCARBONATE Public/Granted day:2017-07-13
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