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:
Feb. 19, 2013
Filed:
Sep. 29, 2010
Toshinori Tomita, Tokyo, JP;
Jumpei Nomura, Tokyo, JP;
Junji Saito, Tokyo, JP;
Yasuhiko Matsuoka, Tokyo, JP;
Kazuo Umemura, Tokyo, JP;
Toshinori Tomita, Tokyo, JP;
Jumpei Nomura, Tokyo, JP;
Junji Saito, Tokyo, JP;
Yasuhiko Matsuoka, Tokyo, JP;
Kazuo Umemura, Tokyo, JP;
Asahi Glass Company, Limited, Tokyo, JP;
Abstract
A polymerization medium having small ozone depletion potential and small global warming potential and having a small chain transfer constant is used, to efficiently produce a fluoropolymer having a high molecular weight and having excellent heat resistance, solvent resistance, chemical resistance, etc. A process for producing a fluoropolymer, which comprises polymerizing a fluoromonomer having a carboxylic acid type functional group and a fluoroolefin using a hydrofluorocarbon as a medium, wherein the hydrofluorocarbon as the medium has 4 to 10 carbon atoms and has a ratio (molar basis) of the number of hydrogen atoms/the number of fluorine atoms (H/F ratio) of from 0.05 to 20.