MAGNETIC RECORDING MEDIUM

申请公布号：JPS57135439(A)

申请号：JP19810019905

申请日期：1981.02.13

申请公布日期：1982.08.21

申请人：

FUJI SHASHIN FILM KK

发明人：YAMADA YASUYUKI;TSUJI NOBUO

分类号：G11B5/712;C09D5/23;G11B5/702;G11B5/706

主分类号：G11B5/712

摘要：PURPOSE:To raise an S/N ratio and to improve an abrasion resistance, by coating ferromagnetic fine powder having a specified specific surface area with butyl acrylate acrylic acid compound oligomer, and dispersing it in a binder consisting of a specific component. CONSTITUTION:The surface of ferromagnetic powder whose specific surface area by a BET surface area measuring method of gamma-Fe2O3, etc. is >=30m<2>/g is coated with butyl acrylate acrylic acid compound oligomer which is <=1,500 in its number mean molecular weight, and contains 3 or less COOH radicals whose copolymerization ratio is 70-98mol% butyl acrylate and 2-30mol% acrylic acid, and the coated magnetic powder concerned is dispersed to a binder containing nitrocellulose and polyurethane resin, by which a magnetic recording medium is obtained.

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