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:
Aug. 21, 2012
Filed:
Oct. 21, 2010
Shigeru Aida, Tokyo, JP;
Manabu Sato, Tokyo, JP;
Takeya Sakamoto, Tokyo, JP;
Nobuo Matsushita, Kitakyushu, JP;
Yuuji Hayase, Kitakyushu, JP;
Tomohiro Gotou, Kitakyushu, JP;
Kenji Fujiwara, Kitakyushu, JP;
Shigeru Aida, Tokyo, JP;
Manabu Sato, Tokyo, JP;
Takeya Sakamoto, Tokyo, JP;
Nobuo Matsushita, Kitakyushu, JP;
Yuuji Hayase, Kitakyushu, JP;
Tomohiro Gotou, Kitakyushu, JP;
Kenji Fujiwara, Kitakyushu, JP;
Asahi Glass Company, Limited, Tokyo, JP;
Abstract
To provide a method for purifying tetrafluoroethylene by removing, from tetrafluoroethylene containing a polymerization inhibitor, the polymerization inhibitor by adsorption. A method of bringing tetrafluoroethylene containing a polymerization inhibitor into contact with a silica gel containing a metal salt in an amount of from 250 to 100,000 mass ppm as calculated as metal atoms to remove the polymerization inhibitor by adsorption, and the metal salt is preferably a salt of a metal of Group 3 to 13 of the Periodic Table, more preferably a salt of a metal of Group 8 to 10 of the Periodic Table. For example, as the metal salt, a salt of at least one metal selected from the group consisting of iron, cobalt, nickel, ruthenium, rhodium, palladium, osmium, iridium and platinum may be used.