AQUEOUS POLYTETRAFLUOROETHYLENE EMULSION AND PROCESS FOR PRODUCTION THEREOF, AQUEOUS POLYTETRAFLUOROETHYLENE DISPERSION OBTAINED USING THE EMULSION, POLYTETRAFLUOROETHYLENE FINE POWDER, AND STRETCH-EXPANDED BODY

Title:

Document Type and Number:

WIPO Patent Application WO/2011/055824

Kind Code:

A1

Abstract:

Provided is a process for producing an aqueous polytetrafluoroethylene (PTFE) emulsion which exhibits high emulsion stability and generates little environmental load and which can provide heat-resistant moldings. A process for the production of an aqueous PTFE emulsion by emulsion-polymerizing tetrafluoroethylene (TFE) using at least one fluorine-containing emulsifying agent selected from the group consisting of fluorine-containing carboxylic acids and salts thereof, each fluorine-containing carboxylic acid having 4 to 8 carbon atoms and containing 1 to 4 etheric oxygen atoms in the main chain, to form an aqueous emulsion containing PTFE microparticles having a mean primary particle diameter of 0.1 to 0.3μm, wherein when initiating the emulsion polymerization of TFE, (a) a (polyfluoroalkyl)ethylene represented by the general formula: CH2=CH-Rf1 and/or (b) a comonomer that exhibits a monomer reactivity ratio (rTFE) of 0.1 to 8 in the copolymerization with TFE is incorporated into the emulsion polymerization system so as to give finally a comonomer (b) content of 0.001 to 0.01% by mass relative to the quantity of PTFE produced.

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Inventors:

HIGUCHI SHINYA (JP)
MATSUOKA YASUHIKO (JP)
KOBAYASHI SHIGEKI (JP)

Application Number:

PCT/JP2010/069863

Publication Date:

May 12, 2011

Filing Date:

November 08, 2010

Export Citation:

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Assignee:

ASAHI GLASS CO LTD (JP)
HIGUCHI SHINYA (JP)
MATSUOKA YASUHIKO (JP)
KOBAYASHI SHIGEKI (JP)

International Classes:

C08F214/26; C08F2/24; C08J9/00

Domestic Patent References:

WO2007046345A1	2007-04-26
WO2009014136A1	2009-01-29

Foreign References:

JPH11240917A	1999-09-07
US20070015865A1	2007-01-18
US20080269408A1	2008-10-30
JPH11240917A	1999-09-07
US5470655A	1995-11-28
US4576869A	1986-03-18
JP2009255949A	2009-11-05

Other References:

"Div. Polymer Chem., Preprints", vol. 7, 1966, AMER. CHEM. SOC., pages: 1116
J. POLYMER SCI., A, vol. 1, no. 8, 1970, pages 2441
ZH. PRIKL. KHIM., vol. 57, 1984, pages 1126
See also references of EP 2500366A4

Attorney, Agent or Firm:

SENMYO, Kenji et al. (JP)
Spring name Kenji (JP)

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