Nitto-denko Corporation

Japan Atomic Energy Agency

Nitto Denki Corporation

Yozo Nagai

Toshimitsu Tachibana

Masaharu Asano

Soji Nishiyama

Masaru Yoshida

Satoru Furuyama

Tetsuya Yamaki

Junichi Moriyama

Atsushi Tanaka

Takashi Wano

Osamu Tabei

Yasunari Maekawa

Yuri Horie

Jinhua Chen

Hajime Yamamoto

Miho Yamaguchi

Kouji Furuuchi

Takuya Maeoka

Norikane Nabata

Yousuke Morita

Satoshi Sakuma

Eizo Kawano

Masaaki Mori

Hiroshi Koshikawa

Yuuzou Muraki

Yuri Hori

Yosuke Yuri

Takahiro Yuyama

Tomohisa Ishizaka

Ikuo Ishibori

Ken-ichi Yoshida

Susumu Okumura

The polymer film of the present invention has through holes extending from one principal surface of the polymer film to the other principal surface of the polymer film. The through holes are straight holes having a central axis extending straight, and have a shape in which the area of a cross-section perpendicular to the direction of the central axis increases from the one principal surface of the polymer film toward the other principal surface. This polymer film has passages in its thickness direction, has an unconventional structure, and can be used in various applications, such as in a waterproof sound-permeable membrane, in a waterproof gas-permeable membrane, and in a suction sheet. The ratio a/b of the opening diameter a of the through holes at the one principal surface to the opening diameter b of the through holes at the other principal surface is 80% or is less than 80%.

Polymer film, waterproof sound-permeable membrane, waterproof sound-permeable member, electronic device, electronic device case, waterproof sound transmission structure, waterproof gas-permeable membrane, waterproof gas-permeable member, waterproof ventilation structure, suction sheet, method for holding workpiece by suction on suction unit, method for producing ceramic capacitor, optical film, optical member, and composition

A water-proof air-permeable filter () includes: a resin film () having formed therein a plurality of through pores (); a treated layer () having hydrophobicity and oil repellency, and formed on at least one of both surfaces in the thickness direction of the resin film () such that the treated layer () has openings () at positions corresponding to the through pores (); and a loop-shaped double-sided tape () stuck to an edge region of one of both surfaces in the thickness direction of the resin film (), with the treated layer () interposed therebetween.

Water-proof air-permeable filter and use of the same

The method of the present disclosure is a method for producing a porous polymer film including: irradiating a strip-shaped polymer film with an ion beam while moving the polymer film transversely to the ion beam, so as to form a polymer film that has collided with ions in the beam; and chemically etching the formed polymer film so as to form openings and/or through holes corresponding to tracks left by the colliding ions in the polymer film. The ion beam () with which the polymer film is irradiated is obtained by folding a tail of an original beam () inwardly toward a center of the original beam by nonlinear focusing. The original beam is composed of ions accelerated in a cyclotron and has a cross-sectional intensity distribution profile in which an intensity is maximum at the center of the original beam and continuously decreases from the center toward the tail of the original beam, and the profile is an intensity distribution profile in a cross section perpendicular to a direction of the original beam.

Method for producing porous polymer film and porous polymer film

A water-proof air-permeable filter () includes: a resin film () having formed therein a plurality of through pores (); and a treated layer () having hydrophobicity and oil repellency, and formed on at least one of both surfaces in the thickness direction of the resin film () such that the treated layer () has openings () at positions corresponding to the through pores (). The through pores () each have a predetermined size larger than or equal to 0.01 &#x3bc;m and smaller than or equal to 10 &#x3bc;m, and are uniformly distributed such that a density of the through pores falls within specific limits included in a range from 10 to 1&#xd7;10pores/mm.

A porous electrode sheet () includes a resin film () being transparent and having insulating properties, and a transparent electrode () placed on one face () of the resin film (). The resin film () is provided with a plurality of through holes () extending linearly from the one face () to the other face (). The transparent electrode () has openings () at positions corresponding respectively to the through holes (). The through holes () of the resin film () and the openings () of the transparent electrode () communicate with each other, and thereby form passages () penetrating the porous electrode sheet () in the thickness direction.

Porous electrode sheet, method for producing the same, and display device

The present invention provides a resin porous membrane with an adhesive layer that exhibits excellent bonding precision and can be bonded to an adherend while maintaining the gas permeability of the porous membrane even when the porous membrane is small, and a method for producing the resin porous membrane with the adhesive layer. The present invention also provides the filter member including the resin porous membrane with the adhesive layer.

Method for producing resin porous membrane with adhesive layer, resin porous membrane with adhesive layer, and filter member

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

An object is to provide an electrolyte membrane that maintains excellent cell characteristics for a long time under high temperature and low water retention, as this is the most important point in fuel cells. A process for producing a polymer electrolyte membrane for fuel cells is provided, which process comprises in sequence: forming graft molecular chains by graft-polymerization of a vinyl silane coupling agent on a polymer film substrate that has phenyl groups capable of holding sulfonic acid groups; introducing sulfonic acid groups into phenyl groups contained in the graft molecular chains; and hydrolyzing and condensing alkoxy groups contained in the graft molecular chains so that a silane crosslinked structure is introduced between the graft molecular chains. A polymer electrolyte membrane produced by the process is also provided.

Silane crosslinked structure-introduced fuel-cell polymer electrolyte membrane and fuel-cell electrode assembly having the same

Polymer ion-exchange membranes having outstanding electrical conductivity, water retention and oxidation resistance are produced by the steps of uniformly mixing an organic high-molecular weight resin with functional inorganics having the abilities to promote graft polymerization of polymerizable monomers, adsorb water and conduct protons, irradiating the resulting functional inorganics/polymer membrane to initiate graft polymerization or graft copolymerization of polymerizable monomers having functional groups, and then introducing sulfonic acid groups into the graft chains.

Process or producing hybrid ion-exchange membranes comprising functional inorganics and graft polymer and electrolyte membranes for use in fuel cells comprising the hybrid ion-exchange membranes

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

A crosslinked nano-inorganic particle/polymer electrolyte membrane composed of a polymer film substrate, graft molecular chains bound to the backbone skeleton of the polymer film substrate and comprising a vinyl monomer graft-polymerized, sulfonic groups bound to the graft molecular chains, and an inorganic material as nano-scale particles uniformly dispersed within a crosslinked structure ascribed to the backbone skeleton of the polymer film substrate and the graft molecular chains, wherein the backbone skeleton of the polymer film substrate, the graft molecular chains, and the nano-inorganic particles mutually construct a crosslinked structure.

Crosslinked nano-inorganic particle/polymer electrolyte membrane for membrane electrode assembly

Growing community of inventors

Osaka, Japan

Yozo Nagai