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    • 11. 发明授权
    • Magnetic recording medium
    • 磁记录介质
    • US5034271A
    • 1991-07-23
    • US184539
    • 1988-04-21
    • Takahito MiyoshiHiroo InabaKazuko HanaiYasuyuki Yamada
    • Takahito MiyoshiHiroo InabaKazuko HanaiYasuyuki Yamada
    • G11B5/702G11B5/71
    • G11B5/7022G11B5/71Y10S428/90Y10T428/25Y10T428/257Y10T428/30Y10T428/31609
    • An improved magnetic recording medium comprises a nonmagnetic support and a magnetic recording layer which comprises a ferromagnetic powder, a lubricant and an abrasive dispersed in a binder comprising a specific polyurethane resin and a specific vinyl chloride copolymer at a ratio (polyurethane resin:vinyl chloride copolymer) in the range of 15:85 to 90:10. The polyurethane resin has a polar group such as --COOM, --SO.sub.3 M, --OSO.sub.3 M and --PO(OM').sub.2, wherein M is hydrogen or an alkali metal atom, and M' is hydrogen, an alkali metal atom or a lower hydrocarbon group, one polar group being contained per 53,000 to 100,000 of the number-average molecular weight of the resin, and the vinyl chloride copolymer has one of the above-mentioned polar group, one polar group unit being contained per 10,000 to 100,000 of the number-average molecular weight of the copolymer. The recording layer contains a fatty acid ester lubricant having a low melting point, a carbon black having an average particle size of 90-150 .mu.m, and/or a .alpha.-alumina having a small average particle size.
    • 改进的磁记录介质包括非磁性载体和磁记录层,其包含分散在粘合剂中的铁磁性粉末,润滑剂和磨料,所述粘合剂包含特定聚氨酯树脂和特定氯乙烯共聚物(聚氨酯树脂:氯乙烯共聚物 )在15:85至90:10的范围内。 聚氨酯树脂具有极性基团,例如-COOM,-SO 3 M,-OSO 3 M和-PO(OM')2,其中M是氢或碱金属原子,M'是氢,碱金属原子或低级烃 基,树脂的数均分子量为53,000至100,000,包含一个极性基团,并且氯乙烯共聚物具有上述极性基团之一,每10,000至100,000个数中包含一个极性基团单元 - 共聚物的平均分子量。 记录层含有低熔点的脂肪酸酯润滑剂,平均粒径为90-150μm的炭黑和/或平均粒度小的α-氧化铝。
    • 12. 发明授权
    • Magnetic recording medium
    • 磁记录介质
    • US4880692A
    • 1989-11-14
    • US171360
    • 1988-03-21
    • Katsumi RyokeMasatoshi TakahashiAkihiro HashimotoTsutomu OkitaKazuko Hanai
    • Katsumi RyokeMasatoshi TakahashiAkihiro HashimotoTsutomu OkitaKazuko Hanai
    • C09D5/23C09D127/04C09D127/06C09D175/00C09D175/04G11B5/73G11B5/735
    • G11B5/735Y10S428/90Y10T428/25Y10T428/265
    • A magnetic recording medium comprising a support having provided on one surface thereof a magnetic recording layer containing ferromagnetic particles dispersed in a binder and on the other surface thereof a backing layer, wherein said binder comprises a vinyl chloride/vinyl acetate copolymer reisn containing at least one group represented by formula (I) or (II): ##STR1## wherein X represents a --COO-- group, a --CONH-- group, or a --C.sub.6 H.sub.4 -- group; x represents an integer of from 1 to 10; R.sub.1, R.sub.2, and R.sub.3 each represents a hydrogen atom, an alkyl group having from 1 to 10 carbon atoms, or an alkyl derivative having from 1 to 10 carbon atoms, or R.sub.1, R.sub.2, and R.sub.3 may be combined to each other to form a heterocycric ring; and Y.sup..crclbar. represents a halogen atom, ClO.sub.4.sup..crclbar., or HgI.sub.3.sup..crclbar. ; or Y.sup..crclbar. is bound to R.sub.2, R.sub.2 represents an alkylene group having from 1 to 10 carbon atoms, and Y.sup..crclbar. represents a --COO.sup..crclbar. group, an --SO.sub.3.sup..crclbar. group, or an --OSO.sub.3.sup..crclbar. group.
    • 一种磁记录介质,其包括在其一个表面上设置有包含分散在粘合剂中的铁磁颗粒的磁记录层和在其另一表面上的背衬层的支撑体,其中所述粘合剂包括含有至少一个的氯乙烯/乙酸乙烯酯共聚物 (I)或(II)表示的基团:其中X表示-COO-基团,-CONH-基团或-C 6 H 4 - 基团; x表示1〜10的整数, R1,R2和R3各自表示氢原子,具有1至10个碳原子的烷基或具有1至10个碳原子的烷基衍生物,或者R1,R2和R3可以彼此结合形成 杂环; Y( - )表示卤素原子,ClO 4( - )或HgI 3( - ); 或Y( - )与R 2结合,R 2表示具有1〜10个碳原子的亚烷基,Y( - )表示-COO( - )基,-SO 3( - )基或-OSO 3( - )组。