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:
Nov. 13, 2007
Filed:
Jul. 16, 2004
Hiroshi Akita, Iruma-gun, JP;
Hiroshi Akita, Iruma-gun, JP;
Honda Motor Co., Ltd., Tokyo, JP;
Abstract
A polyphosphazene derivative and an aromatic ring compound are bonded to one another to obtain an intermediate product. Subsequently, anhydrous sulfuric acid is added in such an amount that the molar ratio is 2 to 8 with respect to a repeating unit of the intermediate product. Further, SOand the intermediate product are reacted with each other to sulfonate the intermediate product. The sulfonation is performed under a condition in which the temperature range is −20 to 0° C. and the total time is 5 to 30 hours. Accordingly, a sulfonated polyphosphazene derivative is obtained, in which the number average molecular weight is not less than 25,000 and the ion exchange capacity exceeds 3.0 mmol/g.