National Institute of Advanced Industrial Science and Technology

Nobuhiko Teshima

Takeo Ebina

Fujio Mizukami

Katsuro Tsukamoto

Shinichi Iwata

Yasuhisa Hasegawa

Hyun-Jeong Nam

Asami Suzuki

The present invention provides a film for a back sheet of a solar cell exhibiting excellent water vapor barrier properties, water resistance and gas barrier properties, has flexibility and mechanical strength and has excellent heat stability, and a method for producing the film. The present invention is a water vapor barrier film comprising a clay membrane coated on a PET substrate, wherein the clay membrane is formed of clay and an additive; the weight ratio of the clay relative to the total sold is 60 to 90% by weight in the clay membrane; the production process thereof comprises a water resistance imparting heat treatment at 100 to 200&#xb0; C. after the coating and drying; the film has a water vapor transmission rate of less than 3 g/m&#xb7;day; the additive in the modified clay is a polyimide; and at least 90% by mole of exchangeable ions is lithium ion, and a method for producing the water vapor barrier film. The above film exhibits water vapor barrier properties and is useful as a back sheet for a solar cell and the like.

Water vapor barrier film and method for producing same

To provide a composite that can find application to various uses in a wide spectrum of fields, for example, sealing members, such as a joint sheet, a gasket and a packing, for use in junction portions, etc. of pipings of power plant and chemical plant, radiation sheets, electromagnetic wave shielding members, soundproof sheets, etc., and provide a process for producing the composite; a gasket or packing based on the composite and a clay dispersion liquid used for the composite. There is provided a composite composed mainly of graphite and clay and having the structure of graphite laminated with and/or impregnated with clay. The composite is produced by subjecting an exfoliated graphite sheet or film or a molding therefrom to coating with and/or immersion in a clay dispersion liquid with clay particles dispersed therein, or by laminating together of an exfoliated graphite sheet and/or film and a sheet and/or film composed mainly of clay. Further, a gasket or packing is produced by molding the composite.

Graphite clay composite material, process for producing the same, gasket or packing comprising the composite material, and clay dispersion used for the composite material

Growing community of inventors

Osaka, Japan

Nobuhiko Teshima