Magnetic recording medium having ferromagnetic powder, a binder

Details Magnetic recording medium having ferromagnetic powder, a binder Magnetic recording medium having ferromagnetic powder, a binder

1992-07-02

1993-11-02

Resan, Stevan A.

Stock material or miscellaneous articles

Composite

Of polyamidoester

428522, 428900, 428694BG, 428694BU, 428694BP, G11B 500

Patent

active

052582310

ABSTRACT:
A magnetic recording medium comprising a non-magnetic support having provided thereon a magnetic layer comprising a ferromagnetic powder and a binder material, wherein the magnetic layer contains at least a vinyl chloride copolymer binder having at least one polar group selected from --SO.sub.3 M and --COOM, wherein M represents a hydrogen atom, an alkali metal, or an ammonium ion, and at least one epoxy group per molecule in an amount of 1.times.10.sup.-4 to 1.times.10.sup.-2 per gram, and a fatty acid amide having from 12 to 26 atoms and present in an amount of from 0.05 to 2 wt % based on the amount of the ferromagnetic powder, and wherein the content of the polar group in the vinyl chloride copolymer binder is from about 1.times.10.sup.-7 to 1.times.10.sup.-3 equivalent per gram, and wherein the vinyl chloride copolymer binder has a weight average molecular weight of from 20,000 to 100,000 and wherein the magnetic layer further contains a polyurethane resin having a polar group.

REFERENCES:
patent: 4594174 (1986-06-01), Nakayama et al.
patent: 4654258 (1987-03-01), Kawamata et al.
patent: 4731292 (1988-03-01), Sasaki et al.

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