MAGNETIC RECORDING MEDIUM

PURPOSE:To obtain the recording medium having excellent durability by incorporating a specific acid or the salt thereof into a magnetic layer. CONSTITUTION:The magnetic layer 2 on a nonmagnetic base 1 is formed mainly of magnetic powder and binder into which the sulfophthalic acid or the salt thereo...

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Bibliographic Details
Main Author SOMEZAWA MASASHI
Format Patent
LanguageEnglish
Published 31.10.1989
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 obtain the recording medium having excellent durability by incorporating a specific acid or the salt thereof into a magnetic layer. CONSTITUTION:The magnetic layer 2 on a nonmagnetic base 1 is formed mainly of magnetic powder and binder into which the sulfophthalic acid or the salt thereof is incorporated. The sulfophthalic acid is phthalic acid, isophthalic acid or terephthalic acid introduced with sulfonic acid in any position of the benzene ring. The salt thereof is such that at least either of the carboxylic acid or sulfonic acid group in the molecule is in the form of a salt. Such salt generates a good interaction between the binders introduced with a neutral or basic polar group, by which the dispersibility of the magnetic powder and the boundary face reinforcement of a magnetic coating compd. are improved. The medium having the excellent durability is thus obtd. Sulfosalicylic acid may be used in place of the sulfophthalic acid.
Bibliography:Application Number: JP19880099090