Toyo Boseki Kabushiki Kaisha

Satoshi Takase

Yoshimitsu Sakaguchi

Shiro Hamamoto

Kota Kitamura

Shigenori Nagahara

Yatsuhiro Tani

Susumu Ohmori

Junko Nakao

Akira Yagi

Tooru Kitagawa

Fusaki Fujibayashi

Hiroaki Taguchi

Hideki Sugihara

Makoto Inoue

Naohiko Takimoto

Kousuke Sasai

Hiroshi Tachimori

Masaru Kobayashi

Miyako Noshiro

There are provided a novel proton-conducting polymer membrane that shows good workability in a fuel cell assembling process and good proton conductivity and durability even under high-temperature, non-humidified conditions, a method for production thereof, and a fuel cell therewith. The proton-conducting polymer membrane includes: a polymer membrane containing a polybenzimidazole compound having a sulfonic acid group and/or a phosphonic acid group; and vinylphosphonic acid contained in the polymer membrane. The fuel cell uses the proton-conducting polymer membrane. The polybenzimidazole compound preferably includes a sulfonic and/or phosphonic acid group-containing component represented by Structural Formula (1): wherein n represents an integer of 1 to 4, Rrepresents a tetravalent aromatic linking unit capable of forming an imidazole ring, Rrepresents a bivalent aromatic linking unit, and Z represents a sulfonic acid group and/or a phosphonic acid group.

Proton conducting polymer membrane, method for production thereof and fuel cell therewith

A composite ion exchange membrane having a high swelling resistance and being superior in mechanical strength and ion conductivity can be provided by means of an composite ion exchange membrane including an ion exchange resin composition and a support membrane having a continuous pore penetrating the support membrane, wherein the support membrane is one which accepts the ion exchange resin composition within the pore, and wherein the ion exchange resin composition is one which contains an ion exchange resin containing, as a main component, an aromatic polyether and/or its derivative, the aromatic polyether being obtained by mixing a compound having a specific structure, an aromatic dihalogenated compound and a bisphenol compound with a carbonate and/or a bicarbonate of an alkali metal and polymerizing the mixture in an organic solvent.

Composite ion-exchange membrane

The present invention provides a composite ion exchange membrane which has high mechanical strength and is suitable for use as a solid polymer electrolyte membrane excellent in ionic conductivity and a method for its production. The invention is achieved by a composite ion exchange membrane including a composite layer comprising a support membrane with continuous voids formed of polybenzazole polymer, the support membrane being impregnated with ion exchange resin, and surface layers formed of ion exchange resin free of support membranes, the surface layers being formed on both surfaces of the composite layer so as to sandwich the composite layer therebetween.

Composite ion exchange membrane and electrolyte membrane electrode assembly

An object of the present invention is to obtain a novel polymeric material capable of forming a solid polymer electrolyte excellent not only in processability, solvent resistance and durability/stability but also in ion conductivity by introducing sulfonic acid group or phosphonic acid group into a polybenzazole compound having excellent properties in view of heat resistance, solvent resistance, mechanical characteristics and the like. Means attaining the object of the present invention is a polybenzazole compound including an aromatic dicarboxylic acid bond unit having sulfonic acid group and/or phosphonic acid group and satisfying either a condition that inherent viscosity measured in concentrated sulfuric acid is in the range of 0.25 to 10 dl/g or a condition that inherent viscosity measured in a methanesulfonic acid solution is in the range of 0.1 to 50 dl/g. The object of the present invention can be attained also by a resin composition containing the aforementioned polybenzazole compound, a resin molding, a solid polymer electrolyte membrane, a solid polymer electrolyte membrane/electrode assembly and a method of preparing the solid polymer electrolyte membrane/electrode assembly.

Polybenzazole compound having sulfonic acid group and/or phosphonic acid group, resin composition containing the same, resin molding, solid polymer electrolyte membrane, solid polymer electrolyte membrane/electrode assembly and method of preparing assembly

The carbon electrode material of the present invention is used for a vanadium redox-flow cell. The carbon electrode material has quasi-graphite crystal structure in which <002> spacing obtained by X-ray wide angle analysis is 3.43 to 3.60 &angst;, size of a crystallite in c axial direction is 15 to 33 &angst; and size of crystallite in a axial direction is 30 to 70 &angst;. In addition, an amount of surface acidic functional groups obtained by XPS surface analysis is 0.1 to 1.2% and total number of surface bound-nitrogen atoms is 5% or smaller relative to total number of surface carbon atoms. The carbon electrode materials formed of a non-woven fabric of a carbonaceouss fiber is preferable.

Carbon electrode material for a vanadium-based redox-flow battery

An electret sheet comprises a porous sheet made of a dielectric polymer and at least one solid material selected from the group consisting of organic materials, inorganic materials, and metallic materials, the porous sheet having the material spaced at various intervals and a method for the manufacture of the said electret sheet.

Electret sheet and a method for the production of the same

Method for the production of an electret sheet

An electretized material for a dust filter which is made of an insulating polymer material such as polypropylene incorporated with a fatty acid metal salt in an amount of not less than 100 ppm in terms of the metal.

Electretized material for a dust filter

Growing community of inventors

Otsu, Japan

Satoshi Takase