The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 21, 2020
Filed:
Aug. 04, 2017
Daikin Industries, Ltd., Osaka-Shi, Osaka, JP;
Ken Yoshida, Osaka, JP;
Hirotoshi Yoshida, Osaka, JP;
Keisuke Hagi, Osaka, JP;
Masayuki Tsuji, Osaka, JP;
Taketo Kato, Osaka, JP;
Yuuji Tanaka, Osaka, JP;
Taku Yamanaka, Osaka, JP;
Kazuya Kawahara, Osaka, JP;
Masamichi Sukegawa, Osaka, JP;
Kazutaka Hosokawa, Osaka, JP;
DAIKIN INDUSTRIES, LTD., Osaka, JP;
Abstract
A method for producing low molecular weight polytetrafluoroethylene less likely to generate C8-C14 perfluorocarboxylic acids and salts thereof. The method includes: (1) feeding into an airtight container: polytetrafluoroethylene; at least one additive selected from the group consisting of hydrocarbons, chlorinated hydrocarbons, alcohols, and carboxylic acids other than C8-C14 perfluorocarboxylic acids; and at least one selected from the group consisting of inert gases other than the above additive and oxygen adsorbents; and (2) irradiating the polytetrafluoroethylene to provide low molecular weight polytetrafluoroethylene having a complex viscosity of 1×10to 7×10Pa·s at 380° C.