Magnetic recording medium and a process of fabricating such magn

Details Magnetic recording medium and a process of fabricating such magn Magnetic recording medium and a process of fabricating such magn

1984-05-25

1985-12-31

Robinson, Ellis P.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

252 6254, 360134, 360135, 360136, 428694, 428900, 427128, G11B 570

Patent

active

045621179

ABSTRACT:
A magnetic recording medium comprising a support and provided thereon a magnetic layer containing magnetic powder and a copolymer capable of being soluble in water by 10 parts by weight or more per 100 parts by weight of water.
Further, a process of preparing a magnetic recording medium wherein magnetic powder is treated with a copolymer capable of dissolving 10 parts by weight or more per 100 parts by weight of water in an aqueous medium under presence of a metal ion and a magnetic paint containing this treated magnetic powder is coated on base to form a magnetic layer is also provided.
Further a process of preparing a magnetic recording medium wherein magnetic powder emulsion that has been pretreated for a higher coercive force is filtered to separate unnecessary materials from magnetic powder and said magnetic powder is surface treated in an aqueous medium with a copolymer capable dissolving 10 parts by weight or more per 100 parts by weight of water, and a magnetic paint comprising this surface treated magnetic powder is coated on base to form a magnetic layer.

REFERENCES:
patent: 3804797 (1974-04-01), Broxterman
patent: 3976822 (1976-08-01), Thomas
patent: 4063000 (1977-12-01), Aonuma
patent: 4135036 (1979-01-01), Muharda
patent: 4178416 (1979-12-01), Hector
patent: 4197347 (1980-04-01), Ogawa
patent: 4328282 (1982-05-01), Lehner
patent: 4407901 (1983-10-01), Miyatsuha
patent: 4439486 (1984-03-01), Yamada
patent: 4529661 (1985-07-01), Ninomiya

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