Title:
AQUEOUS EMULSION OF MODIFIED POLYTETRAFLUOROETHYLENE, FINE POWDER AND METHOD FOR PRODUCING STRETCHED POROUS BODY
Document Type and Number:
WIPO Patent Application WO/2017/030094
Kind Code:
A1
Abstract:
Provided is an environmentally friendly method for producing an aqueous emulsion of a modified polytetrafluoroethylene that is suitable for the production of a stretched porous body having excellent break strength.
A method for obtaining an aqueous emulsion of modified polytetrafluoroethylene particles having an average primary particle diameter of 0.10-0.30 μm by subjecting tetrafluoroethylene and perfluoroalkyl ethylene to emulsion polymerization in an aqueous medium with use of a polymerization initiator in the presence of a fluorine-containing anionic surfactant having a LogPOW of 2.4-3.4, wherein: the amount of perfluoroalkyl ethylene to be used is 120-3,000 ppm relative to the final production amount of the modified polytetrafluoroethylene; the whole amount of the perfluoroalkyl ethylene is present at the beginning of the emulsion polymerization; and a combination of a bromate salt and a bisulfite salt or sulfite salt and/or a combination of a permanganate salt and oxalic acid is used as the polymerization initiator.
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Inventors:
HIGUCHI SHINYA (JP)
NAGAI HIROKI (JP)
KOBAYASHI SHIGEKI (JP)
NAGAI HIROKI (JP)
KOBAYASHI SHIGEKI (JP)
Application Number:
PCT/JP2016/073776
Publication Date:
February 23, 2017
Filing Date:
August 12, 2016
Export Citation:
Assignee:
ASAHI GLASS CO LTD (JP)
International Classes:
C08F2/26; C08F2/00; C08F214/26; C08J3/16; C08J9/00; C08J9/28; B29C48/02; B29C48/08; B29C48/92
Domestic Patent References:
| WO2010113950A1 | 2010-10-07 | |||
| WO2009142080A1 | 2009-11-26 | |||
| WO2014084399A1 | 2014-06-05 | |||
| WO2007046482A1 | 2007-04-26 |
Foreign References:
| JP2005506405A | 2005-03-03 | |||
| JP2009500491A | 2009-01-08 |
Other References:
See also references of EP 3339330A4
Attorney, Agent or Firm:
SENMYO, Kenji et al. (JP)
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