Nitto-Denko Corporation

Toyota Jidosha Kabushiki Kaisha

Kyoto Institute of Technology

National University Corporation Kyoto Institute of Technology

Takashi Wano

Atsushi Tanaka

Yozo Nagai

Osamu Tabei

Yuri Horie

Yoshinori Yamamoto

Yoshio Terada

Junichi Nakayama

Hiroyuki Higuchi

Kenji Furuta

Ryoichi Matsushima

Koichiro Yamashita

Daisuke Kitagawa

Yuuki Fukuda

Hideki Yamane

Osamu Hashimoto

Masataka Tada

Masayoshi Kawabe

Yuri Hori

Yoshihito Takagi

There is disclosed a fuel cell in which an insulating material is disposed, whereby the thermal diffusion of the inside and outside of a fuel cell can be suppressed to suppress the deterioration of the performance of the fuel cell due to a temperature drop. Moreover, the physical properties of the insulating material are specified, whereby appropriate insulating properties required in the fuel cell can be obtained, and startup properties are improved. A fuel cell has a cell stack in which a plurality of unit cells are stacked, and terminal plates disposed on both sides of the cell stack in a cell stack direction thereof. The fuel cell comprises an insulating portion having an insulating material and holding plates which hold the insulating material from both the sides of the insulating material in the cell stack direction, the insulating material is held between the holding plates, and the insulating material has a thermal conductivity of 0.1 W/mK or less and a porosity of 70% or more.

Fuel cell

The method for producing the porous sheet of the present invention includes the steps of (I) preparing a plurality of sheet materials that contain polytetrafluoroethylene and carbon particles and (II) stacking the plurality of sheet materials over one another and rolling the stacked sheet materials. In the method for producing the porous sheet of the present invention, step (I) and step (II) may be repeated alternately. Further, as the sheet materials to be used in the production method of the present invention, a base sheet obtained by forming a mixture containing polytetrafluoroethylene and carbon particles into sheet form also can be used, or a laminated sheet obtained by stacking a plurality of base sheets over one another and rolling them also can be used, for example.

Method for producing laminated porous sheet comprising polytetrafluoroethylene and carbon particles

The present invention provides a method for producing a PTFE fiber that makes it possible, unlike the emulsion spinning process, to obtain a polytetrafluoroethylene (PTFE) fiber, particularly a long PTFE fiber, without using a matrix material, is more productive than conventional production methods such as a slit yarn process, and is capable of enhancing mechanical properties and the degree of freedom in diameter of the obtained fiber. The method for producing the PTFE fiber of the present invention includes the step of reducing a diameter of a string-shape PTFE-containing solid material (a first solid material) by drawing the first solid material at a temperature equal to or higher than a melting point of PTFE. The first solid material can be obtained from a PTFE-containing solid material (a second solid material) containing water and a surfactant, by reducing an amount of the water contained in the second solid material.

Method for producing polytetrafluoroethylene fiber and polytetrafluoroethylene fiber

An electromagnetic wave absorber includes a dielectric layer, a divided conductive film layer and an electromagnetic wave reflective layer, wherein a ratio of thickness 'd' and wavelength '&#x3bb;' satisfies a condition of [0.01&#x2266;d/&#x3bb;0.03], weight per unit area of the electromagnetic wave absorber falls within a range of 1000 g/mand 3000 g/m. The divided conductive film layer is configured such that each side's length of conductive films is dimensioned within a range of 0.5 mm and 4.8 mm and arrangement distance between adjoining conductive films is taken within a range of 0.01 mm and 3 mm.

Electromagnetic wave absorber

Disclosed is a process for production of a polytetrafluoroethylene (PTFE) sheet, which is superior in productivity compared to conventional processes and can reduce the cost of production. Also disclosed is a process for production of a PTFE seal tape. The processes comprise the following steps (i) to (iii): (i) applying a force to a PTFE particle suspension comprising PTFE particles, a surfactant and water (a dispersion medium) so that the particles can come close to each other or contact with each other, thereby forming a PTFE-containing solid material having the water and the surfactant included therein; (ii) shaping the solid material into a sheet-like form; and (iii) reducing the water content in the sheet-like solid material.

Process for production of polytetrafluoroethylene sheet, and process for production of polytetrafluoroethylene seal tape

The present invention provides a method of manufacturing a polytetrafluoroethylene (PTFE) product offering better productivity and a higher degree of flexibility in form of the product to be obtained than the conventional methods of manufacturing a PTFE product, and a method of manufacturing PTFE particle aggregate obtained as an intermediate while manufacturing a PTFE product. According to the manufacturing methods, aggregate of PTFE particles including water and a surfactant is obtained by applying force to a dispersion of PTFE particles containing PTFE particles, a surfactant and water as a dispersion medium, where the force makes the PTFE particles approach or contact with each other. Such a manufacturing method may be carried out, for example, with a chamber () shown in FIG.

Method of manufacturing polytetrafluoroethylene particle aggregate and method of manufacturing polytetrafluoroethylene product

Growing community of inventors

Osaka, Japan

Takashi Wano