| 摘要 |
PURPOSE:To improve the dispersibility of magnetic powder in a magnetic paint and to improve the magnetic characteristic thereof by using a copolymer derived from acrylate and maleic anhydride as at least part of a binder resin. CONSTITUTION:The copolymer derived from the acrylate (CH2=CHCOOR, R is an alkyl group of 1-8C) and maleic anhydride has about 1,000-10,000mol.wt. and is used together with a binder resin of an acrylic resin-or phenolic resin base consisting essentially of an epoxy resin. The compsn. consisting of about 50-120pts.wt. the entire binder by 100pts.wt. the magnetic powder is kneaded for 24hr by a ball mill to prepare the magnetic paint. Said magnetic paint is coated on an aluminum alloy substrate and is cured by baking and thereafter the surface thereof is subjected to a polishing treatment, by which a magnetic disk is obtd. The dispersibility is thus improved, the decrease in the coercive force and squareness ratio owing to the damage of the magnetic powder is prevented and the wear resistance is semipermanently improved.
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