Title:
METHOD FOR PRODUCING POLYTETRAFLUOROETHYLENE FINE POWDER
Document Type and Number:
WIPO Patent Application WO/2013/115278
Kind Code:
A1
Abstract:
Provided is a method for producing a PTFE fine powder having high bulk density and low concentration of non-flocculated PTFE in flocculent drainage. In the present invention, a PTFE emulsion is produced by emulsion-polymerization of TFE in the presence of an aqueous medium, one or more types of fluorine-containing emulsifiers selected from the group consisting of fluorine-containing carboxylic acids and salts thereof having 4-7 carbon atoms and 1-4 etheric oxygen atoms in the main chain thereof, and a radical polymerization initiator, the resultant PTFE emulsion is adjusted to a PTFE concentration of 10-25 mass%, flocculent agitation is performed at a flocculation temperature of 5-18°C, a non-dried PTFE fine powder is separated out, and the obtained non-dried PTFE fine powder is dried to produce a PTFE fine powder.
Inventors:
HIGUCHI SHINYA (JP)
KOBAYASHI SHIGEKI (JP)
NAGAI HIROKI (JP)
KOBAYASHI SHIGEKI (JP)
NAGAI HIROKI (JP)
Application Number:
PCT/JP2013/052108
Publication Date:
August 08, 2013
Filing Date:
January 30, 2013
Export Citation:
Assignee:
ASAHI GLASS CO LTD (JP)
International Classes:
C08F6/22; C08F2/26; C08J3/16
Domestic Patent References:
| WO2009142080A1 | 2009-11-26 | |||
| WO2006095657A1 | 2006-09-14 | |||
| WO2005042593A1 | 2005-05-12 |
Foreign References:
| JPH05186605A | 1993-07-27 | |||
| JP2010037365A | 2010-02-18 | |||
| US20070142541A1 | 2007-06-21 | |||
| US20080269408A1 | 2008-10-30 | |||
| JP2010037365A | 2010-02-18 |
Other References:
See also references of EP 2810958A4
Attorney, Agent or Firm:
SENMYO, Kenji et al. (JP)
Spring name Kenji (JP)
Spring name Kenji (JP)
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Claims:
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