Diafoil Hoechst Company, Limited

Diafoil Company, Ltd.

Kenji Kato

Shigeo Utsumi

Seiji Sakamoto

Kazuo Endo

Chikakazu Kawaguchi

Masashi Inagaki

Toshifumi Takisawa

Kichinojo Tomitaka

Yoshio Meguro

Hidemi Yoshida

Masahiko Fujimoto

Nobuyasu Shudo

Kazuyuki Akatsu

Shigeyuki Watanabe

Disclosed herein is an optical tape comprising: a substrate whose a center-line average roughness (Ra.sup.B) on the surface of one side is not more than 0.005 .mu.m and the number of coarse protuberances having a height of not less than 0.10 .mu.m in the surface of that side is not more than 10 protuberances/cm.sup.2, and an optical recording layer formed on the surface whose the Ra.sup.B is not more than 0.005 .mu.m.

Optical tape

A biaxially oriented polyethylene-2,6-naphthalate (PEN) film for capacitor dielectric which contains the specific monodisperse cross-linked polymer particles is described. The capacitors using the PEN film have excellent handling qualities and workability as well as excellent electrical properties.

Biaxially oriented polyester film for capacitor dielectric

Disclosed herein is a polyester film containing specific fine spherical silica particles. The film of the present invention is especially suitable as a base film for a magnetic recording medium or dielectric for a capacitor. The films of the present invention have the markedly improved properties such as surface properties, electromagnetic properties, electrical properties, etc. due to the excellent dispersibliity of the particles in the film.

Polyester films, magnetic recording media and film capacitors produced

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Yokohama, Japan

Kenji Kato