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:
May. 20, 2008
Filed:
Jan. 22, 2004
Yousuke Nishimura, Settsu, JP;
Masaki Irie, Settsu, JP;
Sadashige Irie, Settsu, JP;
Manabu Fujisawa, Settsu, JP;
Satoshi Tokuno, Settsu, JP;
Mitsuru Kishine, Settsu, JP;
Yousuke Nishimura, Settsu, JP;
Masaki Irie, Settsu, JP;
Sadashige Irie, Settsu, JP;
Manabu Fujisawa, Settsu, JP;
Satoshi Tokuno, Settsu, JP;
Mitsuru Kishine, Settsu, JP;
Daikin Industries, Ltd., Osaka, JP;
Abstract
The present invention provides a process for preparing a fluorine-containing elastomer in a high productivity comparable to that of non-iodine transfer polymerization process by carrying out an iodine transfer polymerization at high pressure. The present invention also provides a fluorine-containing elastomer prepared by this process, and fluorine-containing molded articles. The process is a batch copolymerization process conducted under conditions that the reduced temperature of the critical constant is at least 0.95 and the reduced pressure of the critical constant is at least 0.80 wherein the reduced temperature and the reduced pressure are calculated using the Peng-Robinson formula from the critical temperature, the critical pressure and the composition ratio of each of the monomers in the gaseous phase in a reaction vessel,