Toyo Boseki Kabushiki Kaisha

Akinobu Nagara

Keizo Kawahara

Masayuki Tsutsumi

Kazutake Okamoto

Satoshi Maeda

Naonobu Oda

Hisato Kobayashi

Noriko Takahashi

Kazumoto Imai

Shoichi Uemura

Akira Takahashi

Shigeto Yoshida

Eiji Kumagai

Hiroko Oyama

Shunji Kurahara

Yoshiko Akitomo

Jun Yasui

Takefumi Yoshida

Morio Morino

Shinsuke Yamaguchi

This polyimide film is superior in heat resistance, rigidity and high frequency properties, is free of inconveniences due to curling even when various functional layers are laminated by heating, and is preferable as a substrate film superior in thermal degradation stability for electronic parts. This polyimide film has a planar orientation coefficient of 0.79-0.89 as measured by an X-ray diffraction method, a difference in the surface planar orientation degree between one surface thereof and the other surface thereof of not more than 2 and a curling degree of not more than 5%, which is obtained by imidation of a polyimide precursor film having a particular imidation rate.

Polyimide film

An oriented syndiotactic polystyrene-based film composed of an oriented film made of a syndiotactic styrene polymer and an adhesiveness-improving layer formed from a specific water-dispersible resin on at least one surface of the oriented film, which is excellent in the tight adhesion between the oriented film and the adhesiveness-improving layer, the adhesion between the adhesiveness-improving layer and an ink layer or laminate layer applied thereon, economical efficiency, recyclability, and environmental compatibility in production. It is particularly preferable that the film be produced by applying the aqueous dispersion of the water-dispersible resin on unstretched or uniaxially stretched film to form the adhesiveness-improving layer, stretching the obtained laminate uni- or bi-axially at least one time, and then heat-treating the resulting laminate.

Oriented syndiotactic polystyrene-base film

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Ohtsu, Japan

Akinobu Nagara