Magnetic recording disk

Details Magnetic recording disk Magnetic recording disk

1996-06-21

1998-06-30

Marquis, Melvyn I.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

428141, 428694BS, 428694BU, 428694BY, B32B 516

Patent

active

057731373

ABSTRACT:
A magnetic recording disk having a flexible non-magnetic support, an intervening non-magnetic layer of 0.5 to 5 .mu.m thick which contains as binder and anon-magnetic inorganic powder, and a magnetic layer of 0.02 to 0.5 .mu.m thick containing a binder, a ferromagnetic powder, carbon black and a lubricant to reduced in its tendency to make a magnetic head of a magnetic recording/reproducing device corrosive without reducing its running endurance, by employing a binder polymer containing no chlorine atom in its molecular structure for both the non-magnetic layer and the magnetic layer and by making the magnetic layer to have an upper surface having a Knoop hardness of 14 to 25.

REFERENCES:
patent: 4880666 (1989-11-01), Ito et al.
patent: 5080967 (1992-01-01), Noguchi et al.
patent: 5258223 (1993-11-01), Inaba et al.

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