Magnetic recording medium containing magnetic alloy powder and s

Details Magnetic recording medium containing magnetic alloy powder and s Magnetic recording medium containing magnetic alloy powder and s

1991-04-19

1993-10-05

Resan, Stevan A.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

4284246, 4284259, 428522, 428694BY, 428900, 428694BU, G11B 500

Patent

active

052503542

ABSTRACT:
A magnetic recording medium excellent in electromagnetic characteristics and running durability and a method for producing the same are disclosed, the magnetic recording medium comprising a non-magnetic support and a magnetic layer formed thereon, the magnetic layer containing a magnetic alloy powder and a binder, wherein said magnetic alloy powder has a length in the long axis of 2,000 .ANG. or less and a saturation magnetization (.sigma.s) of 100 emu/g or more; said binder contains a vinyl chloride copolymer, a polyisocyanate, and a polyurethane resin, wherein the polyurethane resin has at least 3 hydroxyl groups per molecule and at least 1.times.10.sup.-5 eq/g of at least one type of polar group selected from the group consisting of --SO.sub.3 M, --OSO.sub.3 M, --COOM, --PO(OM').sub.2 and --OPO(OM').sub.2 (wherein each of M and M' represents a hydrogen atom, an alkali metal or ammonium ion) and the polyurethane resin is used in an amount equal to or more than by weight that of the polyisocyanate, and wherein the vinyl chloride copolymer has at least 1.times.10.sup.-5 eq/g of at least one type of polar group selected from the group consisting of --SO.sub.3 M, --OSO.sub.3 M, --COOM, --PO(OM').sub.2 and --OPO(OM').sub.2 (wherein each of M and M' represents a hydrogen atom, an alkali metal or ammonium ion); and a Kerr rotational angle measured at a surface of the magnetic layer is 5 minutes or more.

REFERENCES:
patent: 4548772 (1985-10-01), Kawamata
patent: 4597990 (1986-07-01), Roller et al.
patent: 5084341 (1992-01-01), Hashimoto
patent: 5085941 (1992-02-01), Ohkubo

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