Invention Grant
- Patent Title: Polycarbonate manufacturing method and polycarbonate
- Patent Title (中): 聚碳酸酯制造方法和聚碳酸酯
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Application No.: US14883759Application Date: 2015-10-15
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Publication No.: US09447235B2Publication Date: 2016-09-20
- Inventor: Naoko Shirota , Takashi Okazoe , Kimiaki Kashiwagi
- Applicant: ASAHI GLASS COMPANY, LIMITED
- Applicant Address: JP Tokyo
- Assignee: ASAHI GLASS COMPANY, LIMITED
- Current Assignee: ASAHI GLASS COMPANY, LIMITED
- Current Assignee Address: JP Tokyo
- Agency: Oblon, McClelland, Maier & Neustadt, L.L.P.
- Priority: JP2013-085816 20130416
- Main IPC: C08G63/02
- IPC: C08G63/02 ; C08G64/28 ; C08G64/30 ; C08G64/00

Abstract:
The present invention relates to a method of producing polycarbonate containing following step (a) and step (b), (a) a step of reacting a specific fluorine-containing carbonate (Compound (1), etc.) and an aromatic dihydroxy compound in the presence of a condensation catalyst, to obtain a prepolymer, and (b) a step of heating the prepolymer at a temperature which is lower than a melting temperature of the prepolymer and performing solid phase polymerization on the prepolymer while a fluorine-containing alcohol that is produced as a by-product is discharged out of a system, to obtain a polycarbonate.
Public/Granted literature
- US20160032046A1 POLYCARBONATE MANUFACTURING METHOD AND POLYCARBONATE Public/Granted day:2016-02-04
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