Magnetic recording medium
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Jul 31, 2001
Grant Date -
N/A
app pub date -
Feb 16, 2000
filing date -
Feb 23, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A magnetic recording medium which is capable of improving durability and reliability while satisfactory electromagnetic conversion characteristics are being maintained, the magnetic recording medium incorporating a non-magnetic support member; and a magnetic layer formed on the non-magnetic support member and mainly composed of magnetic powder and a binder and having a two-layer structure composed of a first magnetic layer and a second magnetic layer, wherein Young's modulus of the first magnetic layer is 140.times.10.sup.5 N/m.sup.2 to 160.times.10.sup.5 N/m.sup.2 and Young's modulus of the second magnetic layer is 45.times.10.sup.5 N/m.sup.2 to 50.times.10.sup.5 N/m.sup.2. The specific surface area of the magnetic powder for use in the first magnetic layer is 42 m.sup.2 /g to 46 m.sup.2 /g and the specific surface area of the magnetic powder for use in the second magnetic layer is 32 m.sup.2 /g to 35 m.sup.2 /g.
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