Magnetic recording medium having a magnetic layer comprising fer

Details Magnetic recording medium having a magnetic layer comprising fer Magnetic recording medium having a magnetic layer comprising fer

1994-05-24

1995-09-19

Resan, Stevan A.

Stock material or miscellaneous articles

Composite

Of polyamidoester

428694BU, 428694BG, 428900, G11B 500

Patent

active

054514649

ABSTRACT:
A non-magnetic base film is provided thereon with a magnetic layer having ferromagnetic powders dispersed in a binder. The binder contains 30 to 70% by weight of a polyurethane resin A having a glass transition temperature Tg conforming to 60.degree. C..ltoreq.Tg.ltoreq.80.degree. C., and 30 to 70% by weight of a polyurethane resin B having a glass transition temperature Tg conforming to 0.degree. C.<Tg.ltoreq.30.degree. C. The polyurethane resins A and B, at least one which contains a polar group, account for 80 to 100% by weight of the binder. The magnetic recording medium can be fabricated with an improved processability to calendering, has excellent electromagnetic characteristics, allows detachment of powders from the edge portions in particular to be substantially avoided at normal temperature, and is improved in terms of running stability in a high-temperature environment.

REFERENCES:
patent: 4525424 (1985-06-01), Bradshaw
patent: 4784907 (1988-11-01), Matsufuji et al.
patent: 5153079 (1992-10-01), Sasaki et al.

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