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. 16, 2012
Filed:
Jul. 21, 2005
Masahiro Toriida, Sodegaura, JP;
Junichi Ishikawa, Ichihara, JP;
Takehiko Omi, Chiba, JP;
Satoko Fujiyama, Kisarazu, JP;
Kuniyuki Takamatsu, Ichihara, JP;
Shoji Tamai, Chiba, JP;
Masahiro Toriida, Sodegaura, JP;
Junichi Ishikawa, Ichihara, JP;
Takehiko Omi, Chiba, JP;
Satoko Fujiyama, Kisarazu, JP;
Kuniyuki Takamatsu, Ichihara, JP;
Shoji Tamai, Chiba, JP;
Mitsui Chemicals, Inc., Minato-Ku, Tokyo, JP;
Abstract
This invention provides a binder for a fuel cell which has high adhesion, low methanol solubility, high methanol permeability and high proton conductivity, a composition for electrode formation, an electrode for a fuel cell, and a fuel cell using them. The binder is particularly suitable for a binder for a direct methanol type fuel cell which requires high proton conductivity. The binder for a fuel cell comprises a block copolymer which comprises a block having a repeating structural unit of a divalent aromatic group that contains a protonic acid group and a block having a repeating structural unit of a divalent aromatic group that does not contain a protonic acid group, and which has a glass transition temperature (Tg) of 180° C. or less. In particular, it is preferable that the block copolymer has an ion exchange group equivalent of from 200 to 1,000 g/mole and a weight retention ratio of 90% or more as measured by immersion in a 64 weight % aqueous methanol solution at 25° C. for 24 hours.