Magnetic recording medium comprising a polyurethane binder resin

Details Magnetic recording medium comprising a polyurethane binder resin Magnetic recording medium comprising a polyurethane binder resin

1990-12-18

1992-03-10

Cashion, Jr., Merrell C.

Stock material or miscellaneous articles

Composite

Of polyamidoester

4284246, 428694, 428900, G11B 500

Patent

active

050949160

ABSTRACT:
A magnetic recording medium is disclosed which has a magnetic layer comprising a ferromagnetic powder and a specific polyurethane resin as a binder. The polyurethane resin has a weight average molecular weight of not more than 30,000, a glass transition point of not higher than 0.degree. C. and a -SO.sub.3 M group, wherein M is a hydrogen atom or an alkali metal atom, in an amount of not less than 0.35% by weight in terms of sulfur atom. The recording medium is excellent in the dispersibility of the magnetic powder in the binder and has high running stability.

REFERENCES:
patent: 4634633 (1987-01-01), Ninomiya et al.

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