Coating processes – Magnetic base or coating – Magnetic coating
Patent
1996-09-27
1997-12-30
Yoon, Tae
Coating processes
Magnetic base or coating
Magnetic coating
427130, 427128, 428694B, 428694BA, 428694BB, 428695, 428900, 428928, 252 6251, 524431, B05D 512, G11B 5845, C08K 322
Patent
active
057027579
ABSTRACT:
A process for preparing a magnetic recording medium capable of exhibiting excellent magnetostatic properties, electromagnetic conversion properties and travel durability in a high density recording region, is disclosed, which process includes the steps of mixing a magnetic powder having a major axis length of 0.1 .mu.m or less, a first binder composed primarily of a vinyl chloride-based copolymer composed of a sulfonate group and/or a group derived from quaternary ammonium salt, a hydroxyl group and an epoxy group and having an average degree of polymerization of 100 to 200, and a first solvent with each other to form a mixture, and dispersing and diluting the mixture by adding a non-magnetic hard inorganic powder, a second binder and a second solvent to the mixture to prepare a magnetic coating material.
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patent: 5424094 (1995-06-01), Tsunoda et al.
patent: 5449527 (1995-09-01), Tobisawa et al.
patent: 5478626 (1995-12-01), Mori et al.
Sony Corporation
Yoon Tae
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