会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 45. 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。