G - Physics – 11 – B
Patent
G - Physics
11
B
G11B 5/70 (2006.01) G11B 5/73 (2006.01)
Patent
CA 2061969
-15- ABSTRACT OF THE DISCLOSURE A digital recording medium having a non-magnetic support made of a polyethylene naphthalate film which is prepared by stretching the film in a longitudinal direction, coating the film with a coating liquid containing a lubri- cant before stretching in a transverse direction, stretching the coated film in a transverse direction and heat setting the film without restretching in a longitudinal direction and which has at least 800 kg/mm2 of a Young's modulus in the longitudinal direction of the film at least 700 kg/mm2 of a Young's modulus in the transverse direction of the film; 0.008 µm or less of a center line average roughness on the smooth surface of the film; and the number of protru- sions having a height of at least 0.27 µm on the smooth surface of the film which is measured by a multiple inter- ference method, the recording medium having good electro- magnetic conversion properties, running durability and being suitable for long-time recording.
Diafoil Hoeschst Company Limited
Kirby Eades Gale Baker
Utsumi Shigeo
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