Magnetic recording medium and base film for the same
AssigneeTeijin Limited
InventorsMakoto Handa, Hirofumi Murooka, Toshifumi Osawa
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Abstract
A base film for magnetic recording media, comprising a film layer containing inert fine particles and having an agglomeration rate of the inert fine particles on the surface of the film of 4 to 20%, or a film layer containing inert fine particles and an ester wax of an aliphatic monocarboxylic acid having 8 or more carbon atoms and a polyhydric alcohol and having a water contact angle of the exposed surface of 70 to 90°. A magnetic recording medium, particularly a metal deposited thin film magnetic recording medium comprising this base film is excellent in electromagnetic conversion characteristics.
Claims9
A laminated thermoplastic resin base film for a magnetic recording medium, comprising:
- a first thermoplastic resin layer having a surface roughness WRa of an exposed surface of 0.1 to 4 nm;
- and
- a second thermoplastic resin layer which contains 0.001 to 5 wt % of inert fine particles having an average particle diameter of primary particles of 0.1 to 2.0 μm and 0.001 to 10 wt % of at least one ester wax selected from the group consisting of sorbitan tristearate, pentaerythritol tribehenate, glycerin tripalmitate and polyoxyethylene distearate, and which has a water contact angle of the exposed surface of 70 to 90°, the first thermosplastic resin layer and the second thermoplastic resin layer being laminated together.
Dependencies are inferred from the claim text.