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1. (WO2017033776) PROCESS FOR PRODUCING FLUOROPOLYMER

Pub. No.:    WO/2017/033776    International Application No.:    PCT/JP2016/073780
Publication Date: Fri Mar 03 00:59:59 CET 2017 International Filing Date: Sat Aug 13 01:59:59 CEST 2016
IPC: C08F 6/10
Applicants: ASAHI GLASS COMPANY, LIMITED
旭硝子株式会社
Inventors: SAITO, Susumu
齋藤 貢
HASHIMOTO, Wakako
橋本 和可子
Title: PROCESS FOR PRODUCING FLUOROPOLYMER
Abstract:
Provided is a process capable of relatively inexpensively producing a fluoropolymer having ring structures by efficiently recovering the unreacted perfluoromonomer having a ring structure from a mixture comprising both the fluorpolymer, which has been obtained by polymerizing a perfluoromonomer having a ring structure, and the unreacted perfluoromonomer having a ring structure. A monomer ingredient comprising a perfluoromonomer having a specific ring structure is polymerized in the presence of a polymerization initiator at a given polymerization temperature to obtain a mixture comprising a fluoropolymer and the unreacted monomer having the ring structure. Thereafter, the perfluoromonomer having the ring structure is recovered from the mixture under the conditions of a temperature which is not higher than [(maximum polymerization temperature)+12ºC] and is not higher than [(10-hour half-life temperature of the polymerization initiator)+12ºC] and of a pressure which is less than atmospheric pressure.