METHOD FOR PRODUCING LOW MOLECULAR WEIGHT POLYTETRAFLUOROETHYLENE, LOW MOLECULAR WEIGHT POLYTETRAFLUOROETHYLENE, AND POWDER

Title:

METHOD FOR PRODUCING LOW MOLECULAR WEIGHT POLYTETRAFLUOROETHYLENE, LOW MOLECULAR WEIGHT POLYTETRAFLUOROETHYLENE, AND POWDER

Document Type and Number:

WIPO Patent Application WO/2018/026012

Kind Code:

A1

Abstract:

Provided is a method capable of easily removing, from low molecular weight polytetrafluoroethylene, nearly all irradiation-derived perfluorocarboxylic acids having 8-14 carbon atoms, and salts thereof. This method for producing low molecular weight polytetrafluoroethylene is characterized by comprising: step (1) of irradiating polytetrafluoroethylene with radiation to obtain low molecular weight polytetrafluoroethylene having a melt viscosity at 380°C of 1×102-7×105 Pa·s; step (2) of pulverizing the low molecular weight polytetrafluoroethylene; and step (3) of heat-treating the low molecular weight polytetrafluoroethylene pulverized in step (2).

Inventors:

YOSHIDA KEN (JP)
YOSHIDA HIROTOSHI (JP)
HAGI KEISUKE (JP)
TSUJI MASAYUKI (JP)
KATO TAKETO (JP)
TANAKA YUUJI (JP)
YAMANAKA TAKU (JP)
KAWAHARA KAZUYA (JP)
SUKEGAWA MASAMICHI (JP)
HOSOKAWA KAZUTAKA (JP)

Application Number:

PCT/JP2017/028469

Publication Date:

February 08, 2018

Filing Date:

August 04, 2017

Export Citation:

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Assignee:

DAIKIN IND LTD (JP)

International Classes:

C08J3/28; C08F8/50; C08J3/12

Foreign References:

JP2001513579A	2001-09-04
JPS4719609B1	1972-06-05
JPH1077378A	1998-03-24
JPH0491134A	1992-03-24
JP2010202741A	2010-09-16
JPS495184A	1974-01-17
JP2002114882A	2002-04-16
JP2009001745A	2009-01-08

Other References: