MAGNETIC COATING

• Main Authors: HAYASHI HIDEO, NAKAGAWA TERUO, OGASAWARA YOSHIHISA, MURASE KIYOSHI, SAKAMOTO YUKIYA
• Format: Patent
• Language: English
• Published: 25.07.1984
• Subjects: ADHESIVES; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; COMPOSITIONS BASED THEREON; CORRECTING FLUIDS; DYES; FILLING PASTES; INKS; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; POLISHES; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF MATERIALS THEREFOR; WOODSTAINS

PURPOSE:To provide a solvent type magnetic coating consisting mainly of magnetic powder and a binder prepared from a specified thermoplastic resin, which is excellent in dispersion of magnetic powder and coatability and produces magnetic recording media having good magnetic properties and durability. CONSTITUTION:The magnetic coating is of solvent type consisting mainly of magnetic power and a binder. The binder is a thermoplastic resin obtained by polymerizing in an organic solvent 100pts.wt. vinyl chloride and/or vinylidene chloride monomer or its blend with a copolymerizable monomer in the presence of 3-100pts.wt. thermoplastic polyurethane elastomer soluble in an organic solvent and having a softening point of 20 deg.C or higher. The coating exhibits good dispersion of magnetic powder and coatability and produces magnetic recording media having excellent magnetic properties and durability.