Title:
A manufacturing method of polytetrafluoroethylene water dispersion liquid
Document Type and Number:
Japanese Patent JP5954432
Kind Code:
B2
Abstract:
The present invention aims to provide a method of producing a PTFE aqueous dispersion which contains PTFE particles having a small particle size and which is excellent in dispersion stability by multistage polymerization without using a long-chain fluorosurfactant. The method includes the steps of: (1) polymerizing a fluoromonomer in an aqueous medium in the presence of a fluorosurfactant and a polymerization initiator to provide an aqueous dispersion containing particles of at least one fluoropolymer selected from the group consisting of PTFE and melt-processible fluororesins excluding polytetrafluoroethylene; and (2) polymerizing TFE alone or TFE and a modifying monomer in an aqueous medium in the presence of the fluoropolymer particles and a polymerization initiator to provide an aqueous dispersion containing PTFE particles. The fluoropolymer particles have an equivalent weight (EW) of 6,000 or more and a volume average particle size of not smaller than 0.1 nm but smaller than 20 nm.
Inventors:
Yoshinori Namba
Application Number:
JP2014549942A
Publication Date:
July 20, 2016
Filing Date:
December 02, 2013
Export Citation:
Assignee:
Daikin Industries, Ltd.
International Classes:
C08F14/26; C08F2/26; C08F2/44
Domestic Patent References:
| JP4714991B2 | 2011-07-06 | |||
| JP2012513535A | 2012-06-14 | |||
| JP2010180364A | 2010-08-19 | |||
| JP4714991B2 | 2011-07-06 | |||
| JP2012513535A | 2012-06-14 | |||
| JP2010180364A | 2010-08-19 |
Foreign References:
| WO2009020187A1 | 2009-02-12 | |||
| WO2010113950A1 | 2010-10-07 | |||
| WO2009020187A1 | 2009-02-12 | |||
| WO2010113950A1 | 2010-10-07 |
Attorney, Agent or Firm:
Atomi International Patent Office