Magnetic recording member

Details Magnetic recording member Magnetic recording member

1977-12-20

1979-05-15

Silverman, Stanley S.

Stock material or miscellaneous articles

Composite

Of polyamidoester

252 6254, 360131, 360134, 360135, 360136, 428423, 428539, 428900, H01F 1002

Patent

active

041548957

ABSTRACT:
In a magnetic recording member comprising a non-magnetic support having provided thereon a magnetic layer comprising finely divided ferromagnetic powders dispersed in a binder, in which the binder comprises about 10 to about 70 wt% of (a) a polyester-polyurethane resin and about 30 to about 90 wt% of (b) a synthetic non-drying oil modified alkyd resin and (c) a polyisocyanate, wherein the molar ratio of the isocyanate groups present in the polyisocyanate (c) to the hydroxyl groups present in the synthetic non-drying oil-modified alkyd resin (b) ranges from about 0.8:1 to about 2.0:1. The binder system in accordance with the present invention provides excellent magnetic properties, particularly improved squareness ratio and 5 MHz output. The binder system of the present invention also enables the use of finely divided ferromagnetic alloy powders, with excellent magnetic properties being maintained when magnetic recording members are produced therefrom.

REFERENCES:
patent: 4049871 (1977-09-01), Ogasa et al.

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