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    • 1. 发明申请
    • MAGNETIC RECORDING MEDIUM
    • 磁记录介质
    • US20070141402A1
    • 2007-06-21
    • US11612755
    • 2006-12-19
    • Takayoshi KUWAJIMAKatsuhiko Yamazaki
    • Takayoshi KUWAJIMAKatsuhiko Yamazaki
    • G11B5/706
    • G11B5/735G11B5/738
    • The present invention provides a magnetic recording medium which has a back coat layer excellent in surface smoothness and durability and is excellent in electromagnetic conversion property. A magnetic recording medium, comprising at least a non-magnetic support, a lower non-magnetic layer on one surface of the non-magnetic support, an upper magnetic layer on the lower non-magnetic layer, and a back coat layer on the other surface of the non-magnetic support, wherein the lower non-magnetic layer contains at least carbon black, a non-magnetic inorganic powder other than carbon black, and a binder resin material, the upper magnetic layer contains at least a ferromagnetic powder, and a binder resin material, and the back coat layer contains at least carbon black, a non-magnetic inorganic powder other than carbon black, a carboxylic acid amine salt, a phosphate amine salt, and a binder resin material.
    • 本发明提供一种磁性记录介质,其具有表面平滑性和耐久性优异且电磁转换特性优异的背涂层。 一种磁记录介质,其至少包括非磁性载体,在非磁性载体的一个表面上的下部非磁性层,在下部非磁性层上的上部磁性层,以及在另一个上的背涂层 所述非磁性载体的表面,其中所述下部非磁性层至少含有炭黑,除了炭黑以外的非磁性无机粉末和粘合剂树脂材料,所述上部磁性层至少含有铁磁性粉末, 粘合剂树脂材料,背涂层至少含有炭黑,除炭黑以外的非磁性无机粉末,羧酸胺盐,磷酸胺盐和粘合剂树脂材料。
    • 2. 发明申请
    • MAGNETIC RECORDING MEDIUM
    • 磁记录介质
    • US20070026264A1
    • 2007-02-01
    • US11461051
    • 2006-07-31
    • Takayoshi KuwajimaAkinori NishizawaAkihiko Seki
    • Takayoshi KuwajimaAkinori NishizawaAkihiko Seki
    • G11B5/716G11B5/71
    • G11B5/70G11B5/73G11B5/735
    • A magnetic recording medium has a non-magnetic layer and a magnetic layer formed in that order on one surface of a non-magnetic support and a back coat layer formed on the other surface of the non-magnetic support. The non-magnetic layer is formed so as to include at least one of α-iron oxide and α-iron hydroxide. The magnetic layer is formed so as to include a ferromagnetic alloy powder. The back coat layer is formed so as to include carbon black, and barium sulfate. At least one of the non-magnetic layer and the magnetic layer includes lubricant. The layers are formed so that the amount of SO42− eluted when the magnetic recording medium is immersed in water at 70° C. is in a range of 300 ppm to 600 ppm inclusive relative to the weight of the magnetic recording medium.
    • 磁记录介质具有非磁性层和在非磁性载体的一个表面上形成的磁性层和形成在非磁性载体的另一个表面上的背涂层。 非磁性层形成为包括α-氧化铁和α-氢氧化铁中的至少一种。 磁性层形成为包含铁磁性合金粉末。 背涂层形成为包括炭黑和硫酸钡。 非磁性层和磁性层中的至少一个包括润滑剂。 这些层被形成为使得当磁记录介质浸入70℃的水中时洗脱的SO 3 - 2的量在300ppm至 相对于磁记录介质的重量为600ppm。
    • 4. 发明授权
    • Magnetic recording medium and method for manufacturing the same
    • 磁记录介质及其制造方法
    • US07601395B2
    • 2009-10-13
    • US11032080
    • 2005-01-11
    • Takayoshi KuwajimaSadafumi Iijima
    • Takayoshi KuwajimaSadafumi Iijima
    • B05D3/02
    • G11B5/7022G11B5/7013
    • A high recording density magnetic recording medium and a manufacturing method therefor are provided. The dilution stability during preparation of magnetic paint is improved and, thereby, even when the magnetic paint concentration is lowered, no problem occurs with the surface roughness and the output of the thin magnetic layer. The magnetic recording medium includes at least a magnetic layer on one surface of a non-magnetic support, wherein the magnetic layer contains a magnetic powder, a vinyl chloride resin having a degree of polymerization of at least 270 and an aliphatic polyester polyurethane resin to serve as binder resins, an aromatic compound having a substituent R (where R is —COOH, —(COOH)2, —OPO(OH)2, —PO(OH)2, or —SO3H), and a phosphoric acid ester. The ratio of binder resins in the magnetic paint is set at 2.0 percent by weight or less relative to a total sum of the binder resins and a solvent.
    • 提供了一种高记录密度磁记录介质及其制造方法。 磁性涂料制备过程中的稀释稳定性提高,即使磁性涂料浓度降低,也不会发生薄磁性层的表面粗糙度和输出问题。 磁记录介质至少包括在非磁性载体的一个表面上的磁性层,其中磁性层含有磁性粉末,聚合度至少为270的氯乙烯树脂和用于服务的脂族聚酯聚氨酯树脂 作为粘合剂树脂,具有取代基R(其中R是-COOH, - (COOH)2,-OPO(OH)2,-PO(OH)2或-SO 3 H)的芳族化合物和磷酸酯。 磁性涂料中的粘合剂树脂的比例相对于粘合剂树脂和溶剂的总和设定为2.0重量%以下。
    • 6. 发明申请
    • MAGNETIC RECORDING MEDIUM
    • 磁记录介质
    • US20080145710A1
    • 2008-06-19
    • US11958036
    • 2007-12-17
    • Takayoshi KUWAJIMAKatsuhiko Yamazaki
    • Takayoshi KUWAJIMAKatsuhiko Yamazaki
    • G11B5/66
    • G11B5/70G11B5/73G11B5/735
    • The present invention provides a high-capacity magnetic recording medium which has a thinned back coat layer excellent in surface smoothness and durability and is excellent in electromagnetic conversion property. A magnetic recording medium comprising at least a non-magnetic support, a lower non-magnetic layer on one surface of the non-magnetic support, an upper magnetic layer on the lower non-magnetic layer, and a back coat layer on the other surface of the non-magnetic support, wherein the lower non-magnetic layer contains at least carbon black, a non-magnetic inorganic powder other than carbon black, and a binder resin material, the upper magnetic layer contains at least a ferromagnetic powder, and a binder resin material, and the back coat layer contains at least carbon black, a non-magnetic inorganic powder other than carbon black, a phosphate amine salt, and nitrocellulose resin as a binder resin material, and has a thickness of 0.3 to 0.8 μm.
    • 本发明提供一种具有优异的表面平滑性和耐久性并且电磁转换性优异的薄的背涂层的高容量磁记录介质。 一种磁记录介质,其至少包括非磁性载体,在非磁性载体的一个表面上的下部非磁性层,在下部非磁性层上的上部磁性层,和在另一个表面上的背涂层 的非磁性载体,其中所述下部非磁性层至少含有炭黑,除了炭黑以外的非磁性无机粉末和粘合剂树脂材料,所述上部磁性层至少含有铁磁性粉末, 粘合剂树脂材料,背涂层至少含有炭黑,除了炭黑以外的非磁性无机粉末,磷酸胺盐和硝酸纤维素树脂作为粘合剂树脂材料,其厚度为0.3〜0.8μm。
    • 10. 发明授权
    • Magnetic recording medium
    • 磁记录介质
    • US07090936B2
    • 2006-08-15
    • US10397845
    • 2003-03-27
    • Kenichi KitamuraTakayoshi KuwajimaSadafumi Iijima
    • Kenichi KitamuraTakayoshi KuwajimaSadafumi Iijima
    • G11B5/738
    • G11B5/738G11B5/7026
    • The present invention provides a high recording density magnetic recording medium with excellent surface smoothness, as well as excellent electromagnetic conversion characteristics and durability. A magnetic recording medium comprising a lower non-magnetic layer containing at least a non-magnetic powder and a binder resin on a non-magnetic support, and an upper magnetic layer with a thickness of 0.2 μm or less on said lower non-magnetic layer, wherein said lower non-magnetic layer contains an acicular powder of hydrated iron oxide as the non-magnetic powder, and said lower non-magnetic layer contains a fatty acid and a fatty acid amide. Preferably the acicular powder of hydrated iron oxide is goethite with an average long axial length of 0.15 μm or less.
    • 本发明提供了具有优异的表面光滑度以及优异的电磁转换特性和耐久性的高记录密度磁记录介质。 一种磁记录介质,包括在非磁性载体上至少包含非磁性粉末和粘合剂树脂的下部非磁性层,以及在所述下部非磁性层上具有0.2μm或更小的厚度的上部磁性层 其中所述下部非磁性层含有作为非磁性粉末的水合氧化铁的针状粉末,所述下部非磁性层含有脂肪酸和脂肪酸酰胺。 优选地,水合氧化铁的针状粉末是具有0.15μm或更小的平均长轴向长度的针铁矿。