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:
Aug. 06, 2002
Filed:
Jul. 12, 2000
Nagakazu Furuya, Kofu-shi, Yamanashi 400-0024, JP;
Other;
Abstract
A reaction layer material for a gas diffusion electrode and a production process therefor, which is obtained by mixing a polytetrafluoroethylene dispersion with a surfactant-containing aqueous solution containing hydrophilic fine particles and a hydrophobic carbon black, each dispersed therein satisfying the relationships: 0.5<D<2 and r <2r , wherein D=r /r , r represents the average particle diameter of the hydrophilic fine particles dispersed in the surfactant-containing aqueous solution, r represents the average particle diameter of the hydrophobic carbon black dispersed in the surfactant-containing aqueous solution, and r represents the average particle diameter of polytetrafluoroethylene fine particles in the polytetrafluoroethylene dispersion to be used; and then adding a self-organizing agent to the mixture and mixing therewith. A jet mill is used for dispersing the hydrophobic carbon black. The liquid obtained by adding and mixing the self-organizing agent is spray-dried or is applied by spraying.