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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。
    • 5. 发明授权
    • Cleaning medium for magnetic recording devices
    • 磁记录装置用清洁介质
    • US6086986A
    • 2000-07-11
    • US276672
    • 1999-03-26
    • Masaki SuzukiHiroo Inaba
    • Masaki SuzukiHiroo Inaba
    • G11B5/41G11B5/708
    • G11B5/41Y10S428/90Y10T428/256Y10T428/257Y10T428/265
    • A cleaning medium for magnetic recording devices comprises a non-magnetic substrate, a lower coating layer, which is overlaid upon the non-magnetic substrate and primarily contains a binder and non-magnetic inorganic particles dispersed in the binder, and a cleaning layer, which is overlaid upon the lower coating layer and contains a binder and inorganic particles dispersed in the binder and at least containing ferromagnetic particles. An at least 50% by weight portion of the non-magnetic inorganic particles, which are contained in the lower coating layer, is constituted of granular inorganic particles, which have a mean particle diameter of at most 0.08 .mu.m, or acicular inorganic particles, which have a mean longer axis length falling within the range of 0.05 .mu.m to 0.3 .mu.m and an acicular ratio falling within the range of 3 to 20. The cleaning medium removes dirt from magnetic heads with high cleaning power, such that the wear of the magnetic heads may be small and no scratch may occur on the cleaned magnetic heads.
    • 用于磁记录装置的清洁介质包括非磁性基底,下涂层,其覆盖在非磁性基底上并且主要包含分散在粘合剂中的粘合剂和非磁性无机颗粒以及清洁层,其中 覆盖在下涂层上并含有分散在粘合剂中并且至少含有铁磁颗粒的粘合剂和无机颗粒。 包含在下涂层中的至少50重量%的非磁性无机颗粒由平均粒径为至多0.08μm的粒状无机颗粒或针状无机颗粒构成, 其平均长轴长度在0.05μm至0.3μm的范围内,针状比落在3至20的范围内。清洁介质以高清洁力从磁头去除灰尘,使得磨损 磁头可能很小,并且在清洁的磁头上不会发生划痕。