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Title:
POLYTETRAFLUOROETHYLENE AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2010/113950
Kind Code:
A1
Abstract:
Disclosed is a polytetrafluoroethylene suitable for forming a porous polytetrafluoroethylene film using a water-soluble and highly volatile surfactant. The polytetrafluoroethylene has non-melt secondary processability, and has a standard specific gravity of 2.160 or less, an average primary particle diameter of 150 nm or more, and a stress relaxation time of 500 sec or more, and is obtained by the emulsion polymerization of tetrafluoroethylene in the presence of a fluorinated surfactant having a logPow of 3.4 or less, and has a rupture strength of 29.7 N or more.

Inventors:
ONO MAKOTO (JP)
SATO HIROYUKI (JP)
SAWAUCHI CHIE (JP)
KATO TAKETO (JP)
Application Number:
PCT/JP2010/055708
Publication Date:
October 07, 2010
Filing Date:
March 30, 2010
Export Citation:
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Assignee:
DAIKIN IND LTD (JP)
ONO MAKOTO (JP)
SATO HIROYUKI (JP)
SAWAUCHI CHIE (JP)
KATO TAKETO (JP)
International Classes:
C08F2/26; C08F14/26
Domestic Patent References:
WO2007049517A12007-05-03
WO2005042593A12005-05-12
WO2009001894A12008-12-31
WO2005042593A12005-05-12
WO2008060461A12008-05-22
WO2007046377A12007-04-26
WO2007119526A12007-10-25
WO2007046482A12007-04-26
WO2007046345A12007-04-26
Foreign References:
JP2003119204A2003-04-23
JP2000143727A2000-05-26
JP4452354B22010-04-21
JP2002201217A2002-07-19
JP3552685B22004-08-11
JP2007046345A2007-02-22
JP2009001894A2009-01-08
US20070015864A12007-01-18
US20070015865A12007-01-18
US20070015866A12007-01-18
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US20070117914A12007-05-24
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US3271341A1966-09-06
JP2003119204A2003-04-23
JP2005527652A2005-09-15
US4576869A1986-03-18
Other References:
See also references of EP 2409996A4
Attorney, Agent or Firm:
YASUTOMI & Associates (JP)
Patent business corporation Yasutomi international patent firm (JP)
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