Magnetic recording medium having a lower layer containing a spec

Details Magnetic recording medium having a lower layer containing a spec Magnetic recording medium having a lower layer containing a spec

1996-12-26

1999-06-01

Resan, Stevan A.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

428336, 4284259, 428694BU, 428694BL, 428694BS, 428694BM, 428900, G11B 05702

Patent

active

059086912

ABSTRACT:
The present invention provides a magnetic recording medium having high durability and excellent electromagnetic transfer characteristics and having a lower coating layer, which contains a binder and has high dispersion property and durability. The magnetic recording medium comprises a lower coating layer where non-magnetic powder or ferromagnetic power is dispersed in a binder and an upper magnetic layer where ferromagnetic powder is dispersed in a binder, said two layers being placed on a non-magnetic support member, whereby the binder of the lower coating layer comprises polyurethane resin, which is a reaction product using diol and organic diisocyanate as major materials, the polyurethane resin contains short-chain diol having cyclic structure by 17 to 40 weight %, and the polyurethane resin contains long-chain diol, containing ether groups by 1.0 to 5.0 mmol/g to the entire polyurethane resin, by 10 to 50 weight %.

REFERENCES:
patent: 4637959 (1987-01-01), Ninomiya et al.
patent: 5153071 (1992-10-01), Watanabe et al.
patent: 5702821 (1997-12-01), Murayama et al.

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