-
公开(公告)号：US11780973B2
公开(公告)日：2023-10-10
申请号：US17259859
申请日：2019-07-12
IPC分类号： C08J3/28 , C08F8/50 , C08F114/26
CPC分类号： C08J3/28 , C08F8/50 , C08F114/26 , C08J2327/18
摘要： Provided is a method for producing low-molecular-weight polytetrafluoroethylene which is less likely to generate C6-C14 perfluorocarboxylic acids and salts thereof. The disclosure relates to 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. The method includes (1) irradiating high-molecular-weight polytetrafluoroethylene with radiation in a substantially oxygen-free state and decomposing the high-molecular-weight polytetrafluoroethylene into a low-molecular-weight component and (2) deactivating, in a substantially oxygen-free state, at least part of main-chain radicals and end radicals generated by the irradiation and providing the low-molecular-weight polytetrafluoroethylene.
-
公开(公告)号：US20210070679A1
公开(公告)日：2021-03-11
申请号：US17099098
申请日：2020-11-16
发明人： Toshihiko OHTA , Hideki Nakaya , Mai Hirai , Takashi Yasuhara , Atsushi Noguchi
IPC分类号： C07C17/361 , C07C21/185 , B01J19/00
摘要： A process for producing one or both of tetrafluoroethylene and hexafluoropropylene, which includes pyrolyzing a low molecular weight fluorine compound by continuous reaction in a microreactor.
-
公开(公告)号：US09944595B2
公开(公告)日：2018-04-17
申请号：US15372974
申请日：2016-12-08
IPC分类号： C07C407/00
CPC分类号： C07C407/00 , C08G65/007 , C08G2650/48
摘要： The present invention provides a process for producing a perfluoropolyoxyalkylene peroxide compound comprising a step of reacting a perfluoroalkene with oxygen, wherein the reaction of the perfluoroalkene with oxygen is performed under ultraviolet irradiation and in the presence of a fluorine source.
-
公开(公告)号：US11427520B2
公开(公告)日：2022-08-30
申请号：US17099098
申请日：2020-11-16
发明人： Toshihiko Ohta , Hideki Nakaya , Mai Hirai , Takashi Yasuhara , Atsushi Noguchi
IPC分类号： C07C17/361 , C07C17/367 , C07C21/185 , C07C21/18 , B01J19/00
摘要： A process for producing one or both of tetrafluoroethylene and hexafluoropropylene, which includes pyrolyzing a low molecular weight fluorine compound by continuous reaction in a microreactor.
-
公开(公告)号：US10029981B2
公开(公告)日：2018-07-24
申请号：US15373131
申请日：2016-12-08
IPC分类号： C07C407/00
摘要： The present invention provides a process for producing a perfluoropolyoxyalkylene peroxide compound comprising a step of reacting a perfluoroalkene with oxygen, wherein the reaction of the perfluoroalkene with oxygen is performed in a microreactor.
-
-
-
-
搜索结果
5 条记录 (耗时 0.014 秒)
