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. 30, 2012
Filed:
Sep. 12, 2008
Mitsuyasu Sakuma, Tokyo, JP;
Hiroshi Sato, Tokyo, JP;
Michihisa Miyahara, Tokyo, JP;
Katsuo Horie, Tokyo, JP;
Hiroshi Sakabe, Tokyo, JP;
Mitsuyasu Sakuma, Tokyo, JP;
Hiroshi Sato, Tokyo, JP;
Michihisa Miyahara, Tokyo, JP;
Katsuo Horie, Tokyo, JP;
Hiroshi Sakabe, Tokyo, JP;
Kureha Corporation, , JP;
Abstract
A method for producing a vinylidene fluoride based polymer powder having a high molecular weight and excellent solubility in an organic solvent, which is useful as an electrode binder for nonaqueous cells, is provided. Methods for producing an NMP solution and an electrode mixture are also provided. A vinylidene fluoride based polymer powder produced by supercritical suspension polymerization in an aqueous dispersion medium wherein a volume of pores having a pore diameter of 0.03 μm to 1.0 μm, as measured by a mercury porosimeter, is 77 vol % to 93 vol % of a total pore volume and an inherent viscosity is 2.0 dl/g or greater is obtained.