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    • 2. 发明授权
    • Magnetic recording medium
    • 磁记录介质
    • US5112680A
    • 1992-05-12
    • US185214
    • 1988-04-25
    • Hiroo InabaTakeshi KakutaKoichi YamauchiAkihiro Matsufuji
    • Hiroo InabaTakeshi KakutaKoichi YamauchiAkihiro Matsufuji
    • C09D5/23C09D127/04C09D127/06C09D175/00C09D175/04G11B5/702G11B5/708G11B5/714
    • G11B5/7085G11B5/7023G11B5/714Y10S428/90Y10T428/257Y10T428/30
    • A magnetic recording medium comprising a nonmagnetic support having provided thereon a magnetic layer comprising a ferromagnetic powder dispersed in a binder, wherein said ferromagnetic powder has a specific surface area of 40 m.sup.2 /g or more as measured by the BET method; said magnetic layer further comprises Al.sub.2 O.sub.3 particles having an average particle diameter of from about 0.1 to 0.5 .mu.m; and said binder comprises the combination of (1) a vinyl chloride resin containing a phosphate ester group represented by ##STR1## wherein M.sub.1 and M.sub.2, which may be the same or different, each represents Na, K, Li, H, N.sym.R.sub.3, or N.sym.HR.sub.2 wherein R represents an alkyl group or a hydrogen atom, and (2) at least one resin other than said vinyl chloride resin containing at least one of --SO.sub.3 M, --OSO.sub.2 M, --COOM, and ##STR2## wherein M, M.sub.1, and M.sub.2, which may be the same or different, each represents Na, K, Li, H, N.sym.R.sub.3, or N.sym.HR.sub.2 wherein R represents an alkyl group or a hydrogen atom; provided that the weight ratio of said resin other than said vinyl chloride resin to said vinyl chloride resin is from about 0.4 to 2.5.
    • 一种包含非磁性载体的磁记录介质,其上设置有包含分散在粘合剂中的铁磁性粉末的磁性层,其中所述铁磁性粉末通过BET法测量的比表面积为40m 2 / g以上; 所述磁性层还包含平均粒径为约0.1至0.5μm的Al 2 O 3颗粒; 并且所述粘合剂包含(1)含有由下式表示的磷酸酯基的氯乙烯树脂的组合,其中M1和M2可以相同或不同,各自表示Na,K,Li,H,N(+ )R3或N(+)HR2,其中R表示烷基或氢原子,和(2)至少一种除了含有-SO 3 M,-OSO 2 M,-COOM和 其中M,M1和M2可以相同或不同,分别表示Na,K,Li,H,N(+)R3或N(+)HR2,其中R表示烷基或氢原子 ; 所述氯乙烯树脂以外的所述树脂与所述氯乙烯树脂的重量比为约0.4〜2.5。