MAGNETIC RECORDING MEDIUM

PURPOSE:To prevent the elimination of a binder from magnetic powder so that the magnetic powder is improved in dispersibility and is decreased in dislodgement and the electromagnetic conversion characteristics and the durability of a magnetic coated film are improved by using a polyurethane resin ha...

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Bibliographic Details
Main Author SOMEZAWA MASASHI
Format Patent
LanguageEnglish
Published 03.10.1989
Subjects
ADHESIVES
CHEMICAL PAINT OR INK REMOVERS
CHEMISTRY
COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS
CORRECTING FLUIDS
DYES
FILLING PASTES
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
INKS
METALLURGY
MISCELLANEOUS APPLICATIONS OF MATERIALS
MISCELLANEOUS COMPOSITIONS
NATURAL RESINS
PAINTS
PASTES OR SOLIDS FOR COLOURING OR PRINTING
PHYSICS
POLISHES
USE OF MATERIALS THEREFOR
WOODSTAINS
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Summary:PURPOSE:To prevent the elimination of a binder from magnetic powder so that the magnetic powder is improved in dispersibility and is decreased in dislodgement and the electromagnetic conversion characteristics and the durability of a magnetic coated film are improved by using a polyurethane resin having a residual aminocarboxylic acid group in the molecule as the binder of the magnetic layer. CONSTITUTION:The polyurethane resin having the residual aminocarboxylic acid group in the molecule is used as the binder of the magnetic layer 2 which is provided on a nonmagnetic base 1 and consists essentially of the magnetic powder and binder. The residual aminocarboxylic acid group bonds securely to the magnetic powder by multidentate coordination on the surface of the magnetic powder and improves the dispersibility of the magnetic powder having all surface characteristics (neutral, acidic, basic) and the boundary face intensifying property of the magnetic coated film. Since the surface of the magnetic powder having the neutral and acidic surface characteristics and the residual aminocarboxylic acid group are securely adsorbed, the adsorption of various additives such as fatty acid having proton- donating atomic groups to the magnetic powder is prevented. The elimination of the binder from the magnetic powder is thereby prevented and the magnetic powder is improved in the dispersibility and decreased in the dislodgment. In addition, the electromagnetic conversion characteristics and durability are improved.
Bibliography:Application Number: JP19880074735