Title:
METHOD FOR PRODUCING LOW MOLECULAR WEIGHT POLYTETRAFLUOROETHYLENE
Document Type and Number:
WIPO Patent Application WO/2019/156038
Kind Code:
A1
Abstract:
Provided is a method for producing a low molecular weight polytetrafluoroethylene with a reduced content of a C6-14 perfluoro carboxylic acid and of a salt thereof. The method for producing low molecular weight polytetrafluoroethylene is characterized by including : a step (1) in which a high molecular weight polytetrafluoroethylene is exposed to radiation to obtain a low molecular weight polytetrafluoroethylene with a melt viscosity of 1.0x102 - 7.0x105Pa.s at 380°C; and a step (2) in which the obtained low molecular weight polytetrafluoroethylene is exposed to a radiation dose such that said low molecular weight polytetrafluoroethylene does not decompose.
Inventors:
TSUJI MASAYUKI (JP)
Application Number:
PCT/JP2019/003936
Publication Date:
August 15, 2019
Filing Date:
February 05, 2019
Export Citation:
Assignee:
DAIKIN IND LTD (JP)
International Classes:
C08J3/28; C08F8/50
Domestic Patent References:
| WO2018026012A1 | 2018-02-08 | |||
| WO2018026017A1 | 2018-02-08 |
Foreign References:
| JP2002327067A | 2002-11-15 | |||
| JP2005523964A | 2005-08-11 | |||
| JP2015078374A | 2015-04-23 | |||
| JP2002105124A | 2002-04-10 | |||
| JP2006063140A | 2006-03-09 | |||
| JPS4891190A | 1973-11-27 | |||
| JPH01294010A | 1989-11-28 | |||
| JPH10147617A | 1998-06-02 | |||
| JPH0420507A | 1992-01-24 |
Other References:
See also references of EP 3730540A4
Attorney, Agent or Firm:
YASUTOMI & ASSOCIATES (JP)
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