Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

G - Physics

11

B

G11B 5/73 (2006.01) G11B 5/733 (2006.01) G11B 5/738 (2006.01)

Patent

CA 2169293

A magnetic recording medium comprising a magnetic layer provided on one side of a base film made from an aromatic polyamide or polyimide, wherein the number (H2) of coarse surface protrusions on the magnetic layer side and the number (H3) of coarse surface protrusions on the nonmagnetic layer side satisfy the following conditions: H2 <= 50, 2 <= H3 <= 100 and the Young's modulus (E20) of extension in at least one direction of the base film at 20 ~C and the Young's modulus (E100) of extension in the same direction of the base film at 100 ~C satisfy the following conditions: E20 >= 800 kg/mm2, 0.5 <= E100/E20. This medium is excellent in durability, traveling behavior and output characteristics under severe environmental conditions, particularly at high temperatures.

Support pour enregistrements magnétiques comportant une couche magnétique disposée sur l'une des faces d'une pellicule de base de polyamide ou de polyimide aromatique, dans laquelle le nombre (H2) des protubérances à surface rugueuse côté couche magnétique et le nombre (H3) des protubérances à surface rugueuse du côté opposé satisfait aux relations suivantes: H2 <= 50; et 2 <= H3 <= 100, tandis que le module de Young (E20) de traction de la pellicule de base dans au moins une direction à 20 ~C et le module de Young (E100) de traction de la pellicule de base dans la même direction à 100 ~C satisfont aux relations suivantes: E20 >= 800 kg/mm?2¿; et 0,5 <= E100/E20. Ledit support se caractérise par sa durabilité, son bon défilement et sa bonne restitution dans des conditions ambiantes difficiles, particulièrement à haute température.

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