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    • 2. 发明授权
    • Magnetic recording medium
    • 磁记录介质
    • US4465737A
    • 1984-08-14
    • US462179
    • 1983-01-31
    • Hajime MiyatukaAkira KasugaAkihiro MatsufujiTsutomu Sugisaki
    • Hajime MiyatukaAkira KasugaAkihiro MatsufujiTsutomu Sugisaki
    • G11B5/708C09D5/23C09D7/12C10M105/08C10N40/18C10N50/08G11B5/70G11B5/71G11B5/714H01F10/02
    • G11B5/71G11B5/714Y10S428/90Y10T428/269Y10T428/2982Y10T428/31678
    • A magnetic recording medium is disclosed. The medium is comprised of a support having a magnetic layer coated thereon. The magnetic layer is comprised of a ferromagnetic metal powder and a binder. The ferromagnetic metal powder has a specific surface area of not less than 30 m.sup.2 /g. The magnetic layer is further comprised of a fatty acid and a fatty acid ester in a total amount of 2 to 10 wt % based on the weight of the ferromagnetic metal powder. The proportion of the fatty acid ester is 15 to 60 wt % based on the total weight of the fatty acid and the fatty acid ester. The surface roughness of the magnetic layer is not more than 0.03.mu.. The recording medium has excellent video characteristics obtained by the use of fine metal particles having the disclosed specific surface area and by increasing the surface properties of the magnetic layer so that spacing loss between the recording or reproducing head and the recording tape is decreased and output level is increased and modulation noise is decreased so that the video S/N is increased.
    • 公开了一种磁记录介质。 介质由其上涂覆有磁性层的载体组成。 磁性层由铁磁金属粉末和粘合剂组成。 铁磁性金属粉末的比表面积为30m 2 / g以上。 磁性层进一步由脂肪酸和脂肪酸酯组成,总量为2〜10重量%,以铁磁性金属粉末的重量计。 脂肪酸酯的比例相对于脂肪酸和脂肪酸酯的总重量为15〜60重量%。 磁性层的表面粗糙度不大于0.03μm。 记录介质具有通过使用具有公开的比表面积的细金属颗粒和通过增加磁性层的表面性质而获得的优异的视频特性,使得记录或再现头与记录带之间的间隔损耗减小并且输出水平 增加了调制噪声,从而增加了视频S / N。
    • 4. 发明授权
    • Process for preparing ferromagnetic metal powder and a magnetic
recording medium including the powder
    • 制备铁磁性金属粉末的方法和包括该粉末的磁记录介质
    • US4481253A
    • 1984-11-06
    • US448651
    • 1982-12-10
    • Akihiro MatsufujiShizuo UmemuraAkira KasugaHajime MiyatukaGoro Akashi
    • Akihiro MatsufujiShizuo UmemuraAkira KasugaHajime MiyatukaGoro Akashi
    • B22F9/22G11B5/706H01F1/06H01F10/02
    • B22F9/22G11B5/70615H01F1/065Y10S428/90Y10T428/25Y10T428/265Y10T428/266Y10T428/31678
    • A process for preparing a ferromagnetic metal powder and a magnetic recording medium utilizing that powder are disclosed. The ferromagnetic metal powder is prepared by heat-treating an acicular iron oxyhydroxide or an acicular iron oxide powder prepared from the acicular iron oxyhydroxide in a non-reducing gas at a temperature of from 300.degree. C. to 1000.degree. C. or in a reducing gas at a temperature of from 150.degree. C. to 500.degree. C. The heat-treated material is washed and then reduced under heating. The ferromagnetic metal powder prepared in this manner is dispersed in a binder and cated on a non-magnetic base to form a magnetic recording medium. By utilizing the washing step followed by heat-treating preparing the ferromagnetic metal powder a large amount of water soluble impurities are removed from the metal powder. The metal powder produced according to this disclosed process as excellent oxidation stability and ability to resist corrosion. Accordingly, the magnetic recording medium prepared utilizing this powder has an excellent ability to resist oxidation and corrosion even when subjected to adverse conditions.
    • 公开了一种制备铁磁金属粉末和利用该粉末的磁记录介质的方法。 通过在300〜1000℃的温度或非还原性气体中以非还原性气体热处理由针状羟基氧化铁制成的针状羟基氧化铁或针状氧化铁粉末,制备强磁性金属粉末。 在150〜500℃的温度下进行气体洗涤。将热处理材料洗涤,然后在加热下还原。 以这种方式制备的铁磁性金属粉末分散在粘合剂中并在非磁性基底上形成磁记录介质。 通过利用洗涤步骤进行热处理,制备铁磁性金属粉末,从金属粉末中除去大量的水溶性杂质。 根据该公开方法制备的金属粉末具有优异的氧化稳定性和耐腐蚀性。 因此,利用这种粉末制备的磁记录介质即使在不利条件下也具有优异的抵抗氧化和腐蚀的能力。
    • 5. 发明授权
    • Method for machining metal work
    • 金属加工方法
    • US4025338A
    • 1977-05-24
    • US609648
    • 1975-09-02
    • Hajime MiyatukaSatoru Honjo
    • Hajime MiyatukaSatoru Honjo
    • B25H7/04B05D7/14B23D36/00B23H9/06B23K7/08B23P13/00C09D5/00G03G5/00G03G7/00G03G8/00G03G13/22G03G15/05G03G15/22
    • B23P13/00B23H9/06C09D5/008G03G13/22G03G7/00G03G8/00Y10T409/30112
    • A process for machining metal work comprising forming a marked-off image from an image-forming material on a surface of a metal work or on a recording layer provided on the surface of the metal work and subsequently machining the metal work by machine cutting and/or oil immersion electrospark machining on the basis of the marked-off image, and including applying a protective resin layer on the image-bearing surface of the metal work prior to any metal machining, the resin layer comprising a mixture of nitrocellulose and a methacrylic polymer in a weight ratio ranging from about 80:20 to 40:60 of the nitrocellulose to the methacrylic polymer and not hindering the viewing of the image, and the methacrylic polymer mainly comprising methyl methacrylate and having a glass transition temperature of higher than about 85.degree. C.
    • 一种用于加工金属加工的方法,包括从金属加工件的表面上的图像形成材料或设置在金属加工件的表面上的记录层上形成标记的图像,随后通过机械切割和/ 或基于标记图像的油浸电火花加工,并且包括在任何金属加工之前在金属加工的图像承载表面上施加保护树脂层,所述树脂层包含硝化纤维素和甲基丙烯酸聚合物的混合物 硝酸纤维素至甲基丙烯酸类聚合物的重量比范围为约80:20至40:60,并且不妨碍图像的观看,主要包含甲基丙烯酸甲酯并且玻璃化转变温度高于约85℃的甲基丙烯酸类聚合物 C。