Toray Industries, Inc.

Kazumasa Yoneyama

Nobuaki Ito

Akimitsu Tsukuda

Aromatic polyamide film and magnetic recording medium using the same

The present invention relates to a film made of an aromatic polyamide having excellent running property, durability and output characteristics when combined with a magnetic medium, and having excellent heat resistance, the number of large protrusions per 100 cm.sup.2 H2 on one surface of the film and the number of large protrusions per 100 cm.sup.2 H3 on the opposite surface of the film satisfy the relationships of:

Aromatic polyamide film

Magnetic recording medium having specified base film surface

The present invention provides a magnetic recording medium including a base film having an aromatic polyamide and a magnetic layer formed on at least one surface of the base film, such that the base film has a tensile Young's modulus in at least one direction of not less than 700 kg/mm.sup.2, a content of materials extractable with methylene chloride of not more than 0.5%, and a dimensional change in the longitudinal direction after applying a load of 1 kg per 1 mm.sup.2 at 100.degree. C. for 10 minutes of not more than 2%. The magnetic recording medium is excellent in running property and durability even under severe conditions.

Growing community of inventors

Otsu, Japan

Kazumasa Yoneyama