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AssigneeHitachi, Ltd.
InventorsWaichi Nagashiro, Hajime Fukke, Yoshiki Kato, Teruo Tsunoda, Teruaki Kobayashi, Yoichi Oba, Katsuyoshi Chiba, Munehisa Mitsuya, Heigo Ishihara, Mitsushi Endo
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A method of manufacturing a paint composite for magnetic films wherein a mixture consisting of a magnetic powder, a polymer such as polyvinylbutyral, and a solvent is ground under a shear stress of 10-400 kg/cm.sup.2, and the ground mixture has a solvent, an epoxy resin and a phenol resin added thereto and is further ground. When a magnetic disk is produced using a paint which has been obtained by executing the first grinding under a shear stress of 10-400 kg/cm.sup.2 with a kneader or the like, it is endowed with excellent electric characteristics and surface flatness.
A method of manufacturing a paint composite for magnetic films which comprises a first step of grinding a mixture under a shear stress of 10-400 kg/cm.sup.2, the mixture comprising 100 parts by weight of a magnetic powder, 1.5-30 parts by weight of at least one polymer selected from the group consisting of polyvinylbutyral polyvinylformal and polyvinyl acetate, and 20-60 parts by weight of a solvent for the polymer, a second step of adding 40-290 parts by weight of a solvent for the polymer to the ground mixture and then grinding the mixture, and a third step of adding 10-70 parts by weight of an epoxy resin, 10-70 parts by weight of a phenol resin and 0-450 parts by weight of a solvent for the polymer to the resultant mixture and further grinding the resultant mixture.
A method of manufacturing a paint composite for magnetic films which comprises a first step of grinding a mixture under a shear stress of 10-400 kg/cm.sup.2, the mixture consisting essentially of 100 parts by weight of a magnetic powder, 1.5-30 parts by weight of at least one polymer selected from the group consisting of polyvinylbutyral, polyvinylformal and polyvinyl acetate, 0.1-15 parts by weight of a filler, and 20-60 parts by weight of a solvent, the second step of adding 40-290 parts by weight of a solvent for said at least one polymer to the ground mixture and then grinding the resultant mixture, and a third step of adding 10-70 parts by weight of an epoxy resin, 10-70 parts by weight of a phenol resin and 0-450 parts by weight of a solvent for said polymer to the resultant mixture and further grinding the mixture.
Dependencies are inferred from the claim text.