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    • 32. 发明授权
    • Magnetic recording medium
    • 磁记录介质
    • US06376083B1
    • 2002-04-23
    • US08532976
    • 1995-09-22
    • Yuichiro MurayamaMasaki SatakeHiroshi HashimotoTsutomu Okita
    • Yuichiro MurayamaMasaki SatakeHiroshi HashimotoTsutomu Okita
    • G11B5702
    • G11B5/7021Y10S428/90Y10T428/31609
    • The present invention provides a magnetic recording medium having high dispersion property, good running durability and good preservation property, and it comprises at least one magnetic layer having ferromagnetic powder dispersed by a binder placed on a non-magnetic support member, whereby a polyurethane resin or a polyurethane urea resin consisting of 5 mol % or less of a long chain diol having weight average molecular weight of 800 to 5,000, a short chain diol having weight average molecular weight of 50 to 500 and/or a short chain diamine and an organic diisocyanate is contained as the binder, said long chain diol has one polar group selected from —COOM, —SO3M, —OSO3M, —OPO(OM)2, or —PO(OM)2 (where M represents a hydrogen atom, an alkali metal ion, or an ammonium ion) in the molecule, and the polar group is contained in the polyurethane by 1 to 5 mol %.
    • 本发明提供了具有高分散性,良好的运行耐久性和良好保存性的磁记录介质,并且它包括至少一个磁性层,该磁性层具有通过放置在非磁性支撑构件上的粘合剂分散的铁磁性粉末,由此聚氨酯树脂或 由5重量%以下的重均分子量为800〜5000的长链二醇,重均分子量为50〜500的短链二醇和/或短链二胺和有机二异氰酸酯组成的聚氨酯脲树脂 所述长链二醇具有一个选自-COOM,-SO3M,-OSO3M,-OPO(OM)2或-PO(OM)2的极性基团(其中M表示氢原子,碱金属 离子或铵离子),聚氨酯中的极性基团含有1〜5摩尔%。
    • 39. 发明授权
    • Method for preparing a magnetic recording medium
    • 磁记录介质的制备方法
    • US4548833A
    • 1985-10-22
    • US461702
    • 1983-01-28
    • Hiroshi HashimotoTsutomu Okita
    • Hiroshi HashimotoTsutomu Okita
    • G11B5/70C09D5/23C09D175/00C09D175/14G11B5/73G11B5/842G11B5/845B05D3/06
    • G11B5/845Y10S428/90
    • A method for preparing a magnetic recording medium is disclosed. The method includes providing a support base and a particular coating composition for the base. The composition is comprised of a ferromagnetic powder, a binder containing a compound capable of being polymerized with electron beam irradiation, and a solvent. The composition has apparent viscosity of about 1 to 150 centipoise at a shearing speed of 4000 sec.sup.-1. After coating the composition on the support base, the coated layer is subjected to magnetic orientation. During orientation or shortly thereafter the coated layer is subjected to electrom beam irradiation and then dried in order to evaporate the solvent. The magnetic recording medium prepared has excellent dispersibility of the ferromagnetic fine powder within the binder, which further provides a smooth surface and excellent electrical properties as well as anti-abrasion properties.
    • 公开了一种制备磁记录介质的方法。 该方法包括提供支撑基底和用于基底的特定涂层组合物。 该组合物由铁磁粉末,含有能够用电子束照射聚合的化合物的粘合剂和溶剂组成。 该组合物在4000sec -1的剪切速度下具有约1至150厘泊的表观粘度。 将组合物涂布在支撑基底上之后,涂覆层经受磁性取向。 在取向期间或不久之后,对涂层进行电磁辐射照射,然后干燥以蒸发溶剂。 制备的磁记录介质具有极好的铁磁细粉在粘合剂中的分散性,这进一步提供了光滑的表面和优异的电性能以及抗磨损性能。