JPH0644343B

JPH0644343B

PURPOSE:To decrease the variance of the performance of a magnetic recording medium contg. magnetic powder and to improve the dwell stability during the dispersion stage by specifying the ratio of the carbon and iron existing in the surface region of the magnetic powder. CONSTITUTION:The ratio of the...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Hauptverfasser: MYAKE TOORU, NAGAOKA SHINSAKU, KOYAMA MIDORI
Format: Patent
Sprache:eng
Schlagworte:
ADHESIVES
BASIC ELECTRIC ELEMENTS
CHEMICAL PAINT OR INK REMOVERS
CHEMISTRY
COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS
COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F
CORRECTING FLUIDS
DYES
ELECTRICITY
FILLING PASTES
INDUCTANCES
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
INKS
INORGANIC CHEMISTRY
MAGNETS
METALLURGY
MISCELLANEOUS APPLICATIONS OF MATERIALS
MISCELLANEOUS COMPOSITIONS
NATURAL RESINS
PAINTS
PASTES OR SOLIDS FOR COLOURING OR PRINTING
PHYSICS
POLISHES
SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
TRANSFORMERS
USE OF MATERIALS THEREFOR
WOODSTAINS
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Beschreibung
Zusammenfassung:PURPOSE:To decrease the variance of the performance of a magnetic recording medium contg. magnetic powder and to improve the dwell stability during the dispersion stage by specifying the ratio of the carbon and iron existing in the surface region of the magnetic powder. CONSTITUTION:The ratio of the carbon and iron (carbon/iron) existing in the surface layer of the magnetic powder of the magnetic recording medium contg. the magnetic powder is specified to =30m /g. At least a polyurethane is usable as the binder for the magnetic layer and can be synthesized by the reaction of a polyol and polyisocyanate. The electromagnetic conversion characteristic of the medium is thereby improved and the dwell stability of the magnetic paint during the dispersion of the magnetic powder is improved.