Dupont Teijin Advanced Papers (japan) Limited

The Furukawa Electric Co., Ltd.

Japan Agency for Marine-earth Science and Technology

Kawamura Sangyo Co., Ltd.

Teijin Techno Products Limited

Dupont Teijin Advanced Papers, Ltd.

Tatsushi Fujimori

Shinji Naruse

Chihiro Kondo

Yasunori Tanaka

Koichi Ukigaya

Katsuya Sakamoto

Sadamitsu Murayama

Masashi Kato

Hajime Izawa

Yoshihiro Fujimoto

Hisashi Katsumata

Hiroyuki Osawa

Takashi Murashima

Yoshihiko Kagetani

Kikuo Hashimoto

Provided is a method for producing a laminate, comprising laminating an aramid paper sheet and a polyimide film together by performing heating and pressurizing process under conditions of a temperature of 275 to 320&#xb0; C. and a pressure of 50 to 400 kgf/cm. In the present invention, an aramid paper sheet-polyimide film laminate with excellent heat resistance, electrical properties, chemical resistance, mechanical properties, and the like can be manufactured by laminating the aramid paper sheet and the polyimide film in a simple method without impairing their properties.

Laminate of aramid paper sheet and polyimide film and method for producing same

The present invention provides an electromagnetic wave suppression sheet provided with: an absorption layer which has surface resistivity of at least 100&#x3a9;/&#x25a1; and which contains an electrical conductive material and an insulating material in the state where the electrical conductive material and the insulating material are in direct contact with each other, the insulating material having a dielectric loss tangent of 0.01 or larger at a frequency of 60 Hz at 20&#xb0; C.; and a contact layer which is formed on a surface, of the absorption layer, opposite to a surface to be irradiated with electromagnetic waves and of which a surface in contact with the absorption layer has surface resistivity of at least 20&#x3a9;/&#x25a1;.

Electromagnetic wave suppression sheet

Provided is an a aramid-resin film laminate comprising an aramid paper comprising an aramid fibrid and an aramid short fiber, and a resin film laminated on each other. The aramid-resin film laminate is obtained by conducting a plasma treatment on a surface of the aramid paper, the surface having a skin layer portion whose heat of fusion measured with a differential scanning calorimeter (DSC) is 25 cal/g or less, and bonding the aramid paper and the resin film to each other by heating, pressing, or heating under pressure, with the plasma treated surface of the aramid paper and a plasma treated surface of the resin film facing each other. This laminate is an aramid-resin film laminate in which the aramid paper and the resin film are laminated on each other without using any adhesive agent and without impairing characteristics of both the aramid paper and the resin film, and is excellent in heat resistance, electrical characteristics, chemical resistance, mechanical characteristics, and the like.

Aramid resin film laminate and method for producing the same

A motor bobbin having a bobbin body portion around which a coil is to be wound, and flange portions provided integrally to both end portions of the bobbin body portion. The bobbin includes: a molded resin article formed by using a polymer having amide linkages, and an insulating paper having an aramid paper made of an aramid fibrid and an aramid short fiber. The surface of the molded resin article and the aramid paper are directly bonded to each other. The motor bobbin can cope with an increased efficiency and an increased power output of a motor generator or the like.

Motor bobbin

Disclosed is colored aramid paper which comprises aramid paper comprising aramid fibrids and short aramid fibers and, formed on at least one surface thereof, a colored layer comprising a colorant and a binder, wherein the colored layer has a surface resistivity of 1&#xd7;10&#x3a9;/&#x25a1; or higher and the colored layer comprises portions colored in a single hue, the colored portions having a color difference of 5.0 or less.

Colored aramid paper and process for producing same

Provided is a motor bobbin around which a winding wire is wound, said motor bobbin comprising insulating paper and a resin molded body. The insulating paper and the resin molded body are coupled and fixed together without using an adhesive agent. Surfaces of the insulating paper which are in contact with the resin molded body are configured using aramid paper comprising an aramid fibrid and aramid short fibers. Resin is melt extruded and thermal-fusion bonded upon the aramid paper comprising the aramid fibrid and the aramid short fibers, and the surfaces configured from the aramid paper are surface treated to obtain the insulating paper. The motor bobbin is obtained by bringing melted portions of the resin molded body into contact with the top of the aramid paper.

In a method for manufacturing a motor bobbin around which a coil is wound, an insulating sheet and a core material are disposed within the cavity of an injection mold, and the motor bobbin is formed by the injection mold into which a resin is injected. The motor bobbin consists of the insulating sheet and a resin molded body.

Motor bobbin and method for manufacturing same

Provided is a conductive aramid paper comprising an aramid short fiber, an aramid fibrid, and a conductive filler, and having a density of 0.45 to 1.10 g/cm, a tensile strength of 2.5 kN/m or higher, and a surface resistivity of 1.0&#xd7;10to 5.0&#xd7;10&#x3a9;/&#x25a1;. This conductive aramid paper has an electric field relaxation function and an antistatic function enough to be favorably used as a material for reducing corona in rotating electrical machines, and also antistatic components for electrical and electronic devices, and sub-materials for processing or assembling any of these.

Conductive aramid paper and method for producing same

A high-strength cable having a twisted layer of non-metallic reinforcing elements in outer coatings is disclosed. The reinforcing elements include coating elements, fiber elements of copolyparaphenylene-3,4'-oxydiphenyleneterephthalic amide disposed in the coating elements, and filling materials filled between the fiber elements, respectively. The lateral compression stress of the fiber elements of the copolyparaphenylene-3,4&#x2032;-oxydiphenyleneterephthalic amide is 75 cN/dtex or more.

High-strength cable

A heat-resistant fiber paper-like sheet comprises 40 to 97% by mass of heat-resistant organic synthetic polymers staple fibers, 3 to 60% by mass of heat resistant organic synthetic polymer fibrid and or an organic resin binder, in a portion of the staple fibers, each staple fiber having two flat end faces having an inclining angle of 10 degrees or more from a plane crossing the fiber axis at a right angles, and is useful as a base material for laminate materials for electrical circuit boards.

Growing community of inventors

Tokyo, Japan

Tatsushi Fujimori