Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1997-12-17

2000-03-28

Resan, Stevan A.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

4284259, 428694BB, 428900, G11B 568

Patent

active

060429380

ABSTRACT:
A magnetic recording medium includes a non-magnetic supporting substrate, and a magnetic layer on one surface thereof and a back coat layer on the other surface thereof, said back coat layer having a non-magnetic powder dispersed in a binder. The back coat layer contains carbon black and an inorganic powder as said non-magnetic powder. The carbon black contains a carbon black species having an average primary particle diameter of 40 to 70 nm, and the inorganic powder has an average primary particle diameter of 40 to 150 nm and a Mohs hardness of at least 3, with a weight ratio between said carbon black and said inorganic powder being 100:0.5 to 100:10. The binder comprises a phenoxy resin, a thermoplastic polyurethane resin having an amino group in a molecule thereof, and a polyisocyanate compound.

REFERENCES:
patent: 5238753 (1993-08-01), Ryoke et al.
patent: 5374478 (1994-12-01), Hitomi et al.
patent: 5443913 (1995-08-01), Kohno et al.
patent: 5698286 (1997-12-01), Ikarashi et al.

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