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Title:
METHOD FOR PRODUCING LOW-MOLECULAR-WEIGHT POLYTETRAFLUOROETHYLENE
Document Type and Number:
WIPO Patent Application WO/2020/013336
Kind Code:
A1
Abstract:
A method for producing low-molecular-weight polytetrafluoroethylene is provided, the method being less apt to yield C6-14 perfluorocarboxylic acids and salts thereof. The method according to the present invention is a method for producing low-molecular-weight polytetrafluoroethylene having a melt viscosity at 380°C of 1.0×102 to 7.0×105 Pa·s, and is characterized by including step (1), in which high-molecular-weight polytetrafluoroethylene is irradiated with radiation substantially in the absence of oxygen to reduce the molecular weight of the high-molecular-weight polytetrafluoroethylene, and step (2), in which at least some of the main-chain radicals and terminal radicals generated by the irradiation are deactivated substantially in the absence of oxygen to obtain the low-molecular-weight polytetrafluoroethylene.

Inventors:
OSHIMA AKIHIRO (JP)
TANAKA TAKAYUKI (JP)
NAKAYA HIDEKI (JP)
SATOH KAZUYUKI (JP)
SENBA RYOSUKE (JP)
Application Number:
PCT/JP2019/027810
Publication Date:
January 16, 2020
Filing Date:
July 12, 2019
Export Citation:
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Assignee:
UNIV OSAKA (JP)
DAIKIN IND LTD (JP)
International Classes:
C08F8/50; C08J3/28; C08J7/00
Domestic Patent References:
WO2018026017A12018-02-08
WO2018026012A12018-02-08
WO2018026012A12018-02-08
WO2018026017A12018-02-08
WO2009020187A12009-02-12
Foreign References:
CN105968247A2016-09-28
JP2002105124A2002-04-10
JP2006063140A2006-03-09
JPH10147617A1998-06-02
JPH0420507A1992-01-24
JPS63146908A1988-06-18
JP2000026614A2000-01-25
Other References:
RADIAT. PHYS. CHEM., vol. 50, 1997, pages 611 - 615
See also references of EP 3822293A4
Attorney, Agent or Firm:
YASUTOMI & ASSOCIATES (JP)
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