Ube Industries, Inc.

Shuichi Hashiguchi

Hiroaki Yamaguchi

Fumio Aoki

Tomohiko Yamamoto

Hideki Ozawa

Shigeru Yamamoto

Masafumi Kohda

Toshinori Hosoma

Ryoichi Sato

Michimasa Shimizu

Katsumi Kato

Hideharu Watakabe

A flexible heating sheet is composed of two heat fusible aromatic polyimide films and an electric heating element having an electric source-connecting terminal at each end which intervenes between the heat fusible aromatic polyimide films, in which each heat fusible aromatic polyimide film is covered with a heat resistant aromatic polyimide film.

Flexible heating sheet

An atomic oxygen-resistant film comprising an atomic oxygen-resistant film formed on a polyimide film, wherein the mass reduction rate thereof is no greater than 1.0% when irradiated with atomic oxygen at an irradiation dose of appromixately 3&#xd7;10atoms/cmat a speed of about 8 km/sec.

Atomic oxygen-resistant film

A polyimide film favorably employable in a method of producing a through-hole in an aromatic-polyimide film having on its surface a laminated or deposited metal film by applying laser beam onto the polyimide film, preferably is composed of a high Tg aromatic polyimide layer which has a Tg of 300&deg; C. or higher or has no noticeable Tg and is produced from a biphenyltetracarboxylic acid compound and an aromatic diamine compound and a low Tg aromatic polyimide layer which has a Tg of lower than 375&deg; C. but higher than 200&deg; C., provided that the Tg of the low Tg polyimide layer is lower than the Tg of the high Tg polyimide layer and the metal film is laminated or deposited on the surface of the low Tg polyimide layer on the side not facing the high Tg polyimide layer.

Method of producing through-hole in aromatic polyimide film

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Tokyo, Japan

Shuichi Hashiguchi