Diafoil Company, Ltd.

Diafoil Hoechst Company, Limited

Masahiko Fujimoto

Kazuo Endo

Chikakazu Kawaguchi

Masashi Inagaki

Toshifumi Takisawa

Yoshio Meguro

Nobuyasu Shudo

Shigeo Utsumi

Kichinojo Tomitaka

Kenji Kato

Kazuyuki Akatsu

Shigeyuki Watanabe

Kazuhiro Kunugihara

A poly(ethylene 2,6-naphthalate) film obtained by stretching a poly(ethylene 2,6-naphthalate) sheet containing cross-linked polymer particles which have at least one ethylene glycol unit and have an average particle size of from 0.05 to 3 .mu.m and a spherical ratio of from 1.0 to 1.1, wherein a deformation ratio of the cross-linked polymer particles in the stretching is from 1.2 to 3.0, has excellent runnability, abrasive resistance and strength.

Poly(ethylene 2,6-naphthalate) film

A polyester film having uniform surface and excellent running property and transparency is disclosed. Said polyester film is characterized by containing 0.01-5 wt. % of porous precipitated silica particles which are coagulates of primary particles having an average particle diameter of 0.01-0.1 .mu.m and have a pore volume of 0.05-0.5 ml/g, a specific surface area of 30-150 m.sup.2 /g and an average particle diameter of 0.1-0.5 .mu.m.

Polyester film comprising specific porous silica particles

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 dispersibility of the particles in the film.

Polyester films, magnetic recording media and film capacitors produced

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.

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Yokohama, Japan

Masahiko Fujimoto