Invention Grant
- Patent Title: Method for producing aqueous fluorine-containing polymer dispersing element, and purified aqueous fluorine-containing polymer dispersing element
-
Application No.: US14403033Application Date: 2013-05-22
-
Publication No.: US09644055B2Publication Date: 2017-05-09
- Inventor: Takashi Yoshimura , Kazuhiro Ohtsuka , Tadashi Ino , Noriyuki Shinoki , Masahiro Kondo
- Applicant: DAIKIN INDUSTRIES, LTD.
- Applicant Address: JP Osaka
- Assignee: DAIKIN INDUSTRIES, LTD.
- Current Assignee: DAIKIN INDUSTRIES, LTD.
- Current Assignee Address: JP Osaka
- Agency: Sughrue Mion, PLLC
- Priority: JP2012-117663 20120523
- International Application: PCT/JP2013/064245 WO 20130522
- International Announcement: WO2013/176185 WO 20131128
- Main IPC: C08F216/14
- IPC: C08F216/14 ; C08F8/26 ; C08F8/12 ; C08F6/02 ; C08F14/18 ; C08F6/16 ; C08F2/24 ; B01D71/32 ; H01M8/1025 ; H01M8/1039 ; B01D69/02

Abstract:
A method for preparing a fluoropolymer aqueous dispersion, including: step (A) of preparing a fluoropolymer aqueous dispersion comprising a fluoropolymer having at least one selected from the group consisting of —SO2Y and —COOR (wherein Y is a halogen, and R is a C1 to C4 alkyl) by emulsion polymerization; step (B) of heating the fluoropolymer aqueous dispersion to 50° C. or higher; and step (C) of contacting the fluoropolymer aqueous dispersion with an ion exchange resin for cation exchange after step (B), thereby providing a purified fluoropolymer aqueous dispersion, the fluoropolymer aqueous dispersion being adjusted to pH 7 or lower from the end of the polymerization in step (A) to the end of step (C).
Public/Granted literature
Information query
IPC分类: