Sumitomo Electric Fine Polymer, Inc.

Daikin Industries, Ltd.

Sumitomo Electric Industries, Limited

Sumitomo Electric Sintered Alloy, Ltd.

Kazuaki Ikeda

Taku Yamanaka

Makoto Nakabayashi

Hirotoshi Yoshida

Hong-Phuc Nguyen

Katsuya Yamada

Fumihiro Hayashi

Masato Uozumi

Eiichi Kobayashi

Yoshimasa Suzuki

Hiroshi Okazaki

Nobutaka Matsushita

Shinichi Kanazawa

Shoichi Takada

Tooru Morita

Masahiro Habuka

Hajime Funatsu

Kouji Mutou

Noriaki Takami

Itsumu Furumoto

Akito Kubo

Yasunori Nagaoka

A crosslinked fluororesin-coated rotor manufacturing method is a method for manufacturing an annular outer rotor of an internal gear pump including the outer rotor, and an inner rotor, a side surfaces of the outer rotor being coated with a crosslinked fluororesin, an inner peripheral surface of the outer rotor not being coated with the crosslinked fluororesin, the method including: using an outer masking jig for covering the inner peripheral surface in a state where the side surfaces of the outer rotor are exposed; coating the outer rotor with an uncrosslinked fluororesin in a state where the outer masking jig is mounted to the outer rotor; and then irradiating the fluororesin with radiation in a state where the outer masking jig is removed from the outer rotor, to crosslink the fluororesin.

Crosslinked fluororesin-coated rotor manufacturing method

A manufacturing method for a polytetrafluoroethylene formed product according to an aspect of the invention is a manufacturing method for a polytetrafluoroethylene formed product, the method including a step of irradiating a forming material containing a polytetrafluoroethylene as a principal component with ionizing radiation, wherein the polytetrafluoroethylene has a melt viscosity at 380&#xb0; C. of not greater than 7&#xd7;10Pa&#xb7;s.

Method for manufacturing polytetrafluoroethylene formed product, and polytetrafluoroethylene formed product

A polytetrafluoroethylene formed product according to an aspect of the invention contains, as a principal component, a polytetrafluoroethylene having a crosslinked structure and has a PV limit of not less than 1600 MPa&#xb7;m/min.

Polytetrafluoroethylene formed product, and manufacturing method therefor

A fluorocarbon resin composite includes a fluorocarbon resin layer on a base, in which a fluorocarbon resin constituting the fluorocarbon resin layer is crosslinked by electron beam irradiation, and the base has a desired shape obtained by machining. The fluorocarbon resin is composed of a tetrafluoroethylene-perfluoro(alkyl vinyl ether) copolymer, polytetrafluoroethylene, or a mixture of the tetrafluoroethylene-perfluoro(alkyl vinyl ether) copolymer and polytetrafluoroethylene. A fluorocarbon resin composite, cookware, and a roller and a belt for use in office automation equipment are each produced by applying an uncrosslinked fluorocarbon resin on a base, subjecting the fluorocarbon resin to electron beam irradiation in a low-oxygen atmosphere to crosslink the fluorocarbon resin while the temperature of the fluorocarbon resin is maintained at a temperature equal to or higher than the melting point of the fluorocarbon resin, and machining the base into a desired shape. There is also provided methods for producing them.

Fluorocarbon resin composite, cookware, cooker, roller for office automation equipment, belt for office automation equipment, and method for producing them

The invention offers a high-frequency circuit substrate that sufficiently decreases the transmission delay and transFmission loss in comparison with the conventional high-frequency circuit substrate. In the offered high-frequency circuit substrate, a dielectric layer made of fluororesin is brought into intimate contact directly with a metal conductor that is used for wiring and that has a surface not subjected to coarsening treatment or primer treatment. The offered high-frequency circuit substrate causes a transmission loss of &#x2212;3 dB/m or less at a frequency of 1 GHz and has a combined specific inductive capacity of 2.6 or less and a combined dielectric loss tangent of 0.0007 or less.

High-frequency circuit substrate

There are provided a fluororesin thin film which is composed of a fluororesin, which has a thickness of 20 &#x3bc;m or less and a Gurley's number of 300 seconds or more, and which includes no defects, such as voids and/or cracks; a method for manufacturing the fluororesin thin film in which after a fluororesin dispersion including a dispersing medium and a fluororesin powder dispersed therein is applied on a flat and smooth foil, the dispersing medium is dried, and the fluororesin powder is sintered; the fluororesin dispersion; a fluororesin composite including a porous base material and the fluororesin thin film; a manufacturing method thereof, a porous fluororesin composite formed by stretching the fluororesin composite; and a separation membrane element using the porous fluororesin composite.

Manufacturing methods for a porous fluororesin composite

Provided are a resin-releasing jig including a base and a releasing layer formed on a surface side of the base, in which the releasing layer is composed of a resin containing a perfluorinated polymer as a main component, and the perfluorinated polymer is crosslinked; and the resin-releasing jig further including a primer layer disposed between the base and the releasing layer, in which the primer layer is composed of a resin containing, as a main component, a perfluorinated polymer and an engineering plastic, the perfluorinated polymer in the primer layer is crosslinked, and the releasing layer has high abrasion resistance and a good adhesive force to the base and thus the resin-releasing jig has good durability. In particular, provided is the resin-releasing jig which is an extrusion molding mold used in an extruder for producing a long resin molded article.

Resin-releasing jig

The invention provides a multi-layered transfer belt for image forming apparatus including a base layer, an elastic layer (intermediate layer) and a surface layer, having a high surface resistivity, an excellent toner releasing property and an excellent non-contaminating property. The transfer belt for image forming apparatus is characterized in including, on the base layer, an elastic layer containing an elastomer and a surface layer formed by a fluorine-containing polymer, and preferably further characterized in that the elastic layer is formed by an elastomer rendered ionic conductive, or in that a binder layer is included between the elastic layer and the surface layer, and that the binder layer is formed by a material having a melting point equal to or lower than a thermal decomposition point of the material constituting the elastic layer and a thermal decomposition point equal to or higher than a melting point of the material constituting the surface layer.

Transfer belt for image forming apparatus

A manufacturing method is provided for a roller, by which a roller having low eccentricity and high surface smoothness can be obtained without the need to perform cumbersome processes such as polishing of a foamed layer. The manufacturing method for a roller includes the steps of injecting a foam-layer compound into the space between a core bar, which is disposed at the center of a cylindrical mold, and an electron beam-irradiated tube, which has an outer diameter somewhat smaller than an inside diameter of the cylindrical mold, and which is set inside the cylindrical mold, and heating and foaming the foam-layer compound, so that the outer surface of the electron beam-irradiated tube is pressed against the inner surface of the cylindrical mold.

Growing community of inventors

Osaka, Japan

Kazuaki Ikeda