Magnetic recording medium comprising a lower magnetic layer cont

Details Magnetic recording medium comprising a lower magnetic layer cont Magnetic recording medium comprising a lower magnetic layer cont

1990-08-22

1992-10-06

Thibodeau, Paul J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428323, 428329, 428336, 428402, 4284246, 4284259, 428515, 428518, 428520, 428522, 428694, 428695, 428900, G11B 500

Patent

active

051530538

ABSTRACT:
A magnetic recording medium excellent in video output and audio output is disclosed which comprises a non-magnetic support having thereon at least plurality of a first magnetic layer and a second magnetic layer, containing ferromagnetic particles dispersed in a binder, in that sequence, wherein said first magnetic layer contains an amine-modified vinyl chloride copolymer as the binder. Preferably, the second magnetic layer contains a vinyl chloride copolymer as a binder having at least one polar group selected from the group consisting of --OH, an epoxy group, --COOM, --SO.sub.3 M, --OSO.sub.3 M, ##STR1## wherein M represents hydrogen, an alkali metal or ammonium.

REFERENCES:
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patent: 4844946 (1989-05-01), Komatsu et al.
patent: 4851289 (1989-07-01), Ogawa
patent: 4865924 (1989-09-01), Saito et al.
patent: 4965120 (1990-10-01), Ono et al.

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