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:
Oct. 05, 2010
Filed:
May. 15, 2008
Mai Taguchi, Osaka, JP;
Kenji Otoi, Osaka, JP;
Yoshiyuki Takase, Osaka, JP;
Hideya Saitou, Osaka, JP;
Yoshiyuki Hiraga, Osaka, JP;
Mai Taguchi, Osaka, JP;
Kenji Otoi, Osaka, JP;
Yoshiyuki Takase, Osaka, JP;
Hideya Saitou, Osaka, JP;
Yoshiyuki Hiraga, Osaka, JP;
Daikin Industries, Ltd., Osaka, JP;
Abstract
The present invention provides a polymerization inhibitor preventing the self-polymerization of TFE and the generation of a modified polymer of a polymerization inhibitor in a distillation step, particularly in a rectification step, of TFE. The present invention provides a method of distilling tetrafluoroethylene in the presence of a polymerization inhibitor comprising a cyclohexadiene compound of the formula:R-A-Rwherein Ris a hydrocarbon group having 1 to 5 carbon atoms, Ris a hydrogen atom or a hydrocarbon group having 1 to 5 carbon atoms, and A is a cyclohexadiene ring. The cyclohexadiene compound is preferably α-terpinene or γ-terpinene.