Dupont Teijin Advanced Papers (japan) Limited

Koichi Ukigaya

Yasunori Tanaka

Shinji Naruse

Tatsushi Fujimori

Chihiro Kondo

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;.

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Tokyo, Japan

Koichi Ukigaya