利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

59 条记录 (耗时 0.023 秒)

    Process for preparing ferromagnetic metal powder and a magnetic recording medium including the powder
    1.
    发明授权
    Process for preparing ferromagnetic metal powder and a magnetic recording medium including the powder 失效
    制备铁磁性金属粉末的方法和包括该粉末的磁记录介质

    公开(公告)号：US4481253A

    公开(公告)日：1984-11-06

    申请号：US448651

    申请日：1982-12-10

    申请人： Akihiro Matsufuji ,  Shizuo Umemura ,  Akira Kasuga ,  Hajime Miyatuka ,  Goro Akashi

    发明人： Akihiro Matsufuji ,  Shizuo Umemura ,  Akira Kasuga ,  Hajime Miyatuka ,  Goro Akashi

    IPC分类号： B22F9/22 ,  G11B5/706 ,  H01F1/06 ,  H01F10/02

    CPC分类号： B22F9/22 ,  G11B5/70615 ,  H01F1/065 ,  Y10S428/90 ,  Y10T428/25 ,  Y10T428/265 ,  Y10T428/266 ,  Y10T428/31678

    摘要： 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.

    摘要翻译： 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。

    Magnetic recording medium
    2.
    发明授权
    Magnetic recording medium 失效
    磁记录介质

    公开(公告)号：US4465737A

    公开(公告)日：1984-08-14

    申请号：US462179

    申请日：1983-01-31

    申请人： Hajime Miyatuka ,  Akira Kasuga ,  Akihiro Matsufuji ,  Tsutomu Sugisaki

    发明人： Hajime Miyatuka ,  Akira Kasuga ,  Akihiro Matsufuji ,  Tsutomu Sugisaki

    IPC分类号： G11B5/708 ,  C09D5/23 ,  C09D7/12 ,  C10M105/08 ,  C10N40/18 ,  C10N50/08 ,  G11B5/70 ,  G11B5/71 ,  G11B5/714 ,  H01F10/02

    CPC分类号： G11B5/71 ,  G11B5/714 ,  Y10S428/90 ,  Y10T428/269 ,  Y10T428/2982 ,  Y10T428/31678

    摘要： 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.

    摘要翻译： 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。

    Magnetic recording medium
    5.
    发明授权
    Magnetic recording medium 失效
    磁记录介质

    公开(公告)号：US4784914A

    公开(公告)日：1988-11-15

    申请号：US944114

    申请日：1986-12-22

    申请人： Akihiro Matsufuji ,  Akira Kasuga ,  Shigeo Komine ,  Yasuyuki Yamada ,  Hajime Miyatsuka

    发明人： Akihiro Matsufuji ,  Akira Kasuga ,  Shigeo Komine ,  Yasuyuki Yamada ,  Hajime Miyatsuka

    IPC分类号： C08G18/08 ,  C08L75/04 ,  C09D5/23 ,  C09D127/04 ,  C09D127/06 ,  C09D175/00 ,  C09D175/04 ,  G11B5/702

    CPC分类号： G11B5/7022 ,  C08G18/0819 ,  C08L75/04 ,  Y10S428/90 ,  Y10T428/256 ,  Y10T428/257 ,  Y10T428/31529 ,  Y10T428/31609 ,  Y10T428/31935

    摘要： A magnetic recording medium comprising a nonmagnetic support and a magnetic recording layer provided on the support, said magnetic recording layer comprising a binder and a ferromagnetic powder dispersed therein, which is characterized in that said binder is composed of a resin component comprising:a vinyl chloride copolymer containing a repeating unit having at least one polar group selected from the group consisting of --SO.sub.3 M, --OSO.sub.3 M, --COOM and --PO(OM').sub.2, wherein M is hydrogen or an alkali metal atom, and M' is any one of hydrogen, an alkali metal atom and a lower hydrocarbon group, and a repeating unit having an epoxy group; anda polyurethane resin containing a repeating unit having at least one polar group selected from the group consisting of --SO.sub.3 M, --OSO.sub.3 M, --COOM and --PO(OM').sub.2, wherein M and M' have the same meanings as defined above.

    摘要翻译： 一种磁记录介质，包括设置在所述载体上的非磁性载体和磁记录层，所述磁记录层包含粘合剂和分散在其中的铁磁性粉末，其特征在于，所述粘合剂由树脂组分构成，所述树脂组分包括：氯乙烯 含有具有至少一个选自-SO 3 M，-OSO 3 M，-COOM和-PO（OM'）2的极性基团的重复单元的共聚物，其中M是氢或碱金属原子，M'是任何一个 的氢，碱金属原子和低级烃基，以及具有环氧基的重复单元; 和含有至少一个选自-SO 3 M，-OSO 3 M，-COOM和-PO（OM'）2的极性基团的重复单元的聚氨酯树脂，其中M和M'具有与上述相同的含义。

    Magnetic recording medium using a binder resin containing a polar group, and a lubricant system comprising two types of fatty acid esters and one fatty acid
    10.
    发明授权
    Magnetic recording medium using a binder resin containing a polar group, and a lubricant system comprising two types of fatty acid esters and one fatty acid 失效
    使用含有极性基团的粘合剂树脂的磁记录介质和包含两种脂肪酸酯和一种脂肪酸的润滑剂体系

    公开(公告)号：US5041336A

    公开(公告)日：1991-08-20

    申请号：US251437

    申请日：1988-09-30

    申请人： Takao Ohya ,  Yasuo Nishikawa ,  Akihiro Matsufuji ,  Akira Kasuga ,  Kiyomi Ejiri

    发明人： Takao Ohya ,  Yasuo Nishikawa ,  Akihiro Matsufuji ,  Akira Kasuga ,  Kiyomi Ejiri

    IPC分类号： C09D5/23 ,  C09D127/04 ,  C09D127/06 ,  C10M105/34 ,  C10M105/38 ,  C10N40/18 ,  G11B5/702 ,  G11B5/708 ,  G11B5/71

    CPC分类号： G11B5/71 ,  G11B5/702 ,  G11B5/7021 ,  G11B5/7023 ,  Y10S428/90 ,  Y10T428/31551 ,  Y10T428/3158 ,  Y10T428/31786

    摘要： A magnetic recording medium comprising a non-magnetic support having provided thereon a magnetic layer comprising a ferromagnetic powder dispersed in a binder,wherein said binder comprises a polymer containing a polar group selected from --SO.sub.3 M, --OSO.sub.3 M, --COOM, ##STR1## where M represents a hydrogen atom, Li, Na, K or NR.sub.4 where R represents a hydrogen atom or an alkyl group, and M' represents a hydrogen atom, Li, Na, K, an alkyl group or NR.sub.4 where R represents a hydrogen atom or an alkyl group, andsaid magnetic layer contains at least one fatty acid ester compound represented by formula (I), at least one fatty acid ester compound represented by formula (II), and at least one fatty acid having from 11 to 35 carbon atoms: ##STR2## wherein R.sup.1 represents a linear or branched chain hydrocarbon group having from 11 to 35 carbon atoms, R.sup.2 represents a linear or branched chain hydrocarbon group having from 1 to 8 carbon atoms or a phenyl group, X represents a hydrogen atom or a methyl group, and n represents an integer of from 2 to 200; ##STR3## wherein R.sup.3 represents a linear or branched chain hydrocarbon group having from 11 to 35 carbon atoms and R.sup.4 represents a linear or branched chain hydrocarbon group having from 1 to 8 carbon atoms.

    摘要翻译： 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粉末的磁性层，其中所述粘合剂包含含有选自-SO 3 M，-OSO 3 M，-COOM，中的极性基团的聚合物，其中 M表示氢原子，Li，Na，K或NR4，其中R表示氢原子或烷基，M'表示氢原子，Li，Na，K，烷基或NR4，其中R表示氢原子或 烷基，所述磁性层含有至少一种由式（I）表示的脂肪酸酯化合物，至少一种由式（II）表示的脂肪酸酯化合物和至少一种具有11至35个碳原子的脂肪酸 （Ⅰ）其中R1表示碳原子数为11〜35的直链或支链烃基，R2表示碳原子数为1〜8的直链或支链烃基或苯基，X表示氢原子 原子或甲基， n表示2〜200的整数， （II）其中R 3表示具有11至35个碳原子的直链或支链烃基，R 4表示具有1至8个碳原子的直链或支链烃基。