公开(公告)号：US10538605B2

公开(公告)日：2020-01-21

申请号：US16069052

申请日：2017-08-04

Applicant: DAIKIN INDUSTRIES, LTD.

Inventor： Ken Yoshida ,  Hirotoshi Yoshida ,  Keisuke Hagi ,  Masayuki Tsuji ,  Taketo Kato ,  Yuuji Tanaka ,  Taku Yamanaka ,  Kazuya Kawahara ,  Masamichi Sukegawa ,  Kazutaka Hosokawa

IPC: C08F2/46 ,  C08F2/50 ,  C08G61/04 ,  C08F8/50 ,  C08J3/28

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 1×102 to 7×105 Pa·s at 380° C.