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    • 1. 发明授权
    • Magnetic recording medium
    • 磁记录介质
    • US06127030A
    • 2000-10-03
    • US50181
    • 1998-03-30
    • Shuji IidaKiyoto Fukushima
    • Shuji IidaKiyoto Fukushima
    • G11B5/735
    • G11B5/735Y10T428/25
    • Disclosed is a magnetic recording medium good in production efficiency, paint stability and electromagnetic characteristics, and improved in running properties and durability, which has a magnetic layer formed on a surface side of a non-magnetic support and a backcoat layer formed on a back side thereof, in which said backcoat layer is formed by kneading a compounded composition comprising 50 parts to 120 parts by weight of carbon black (P) per 100 parts by weight of a resin binder (B) (P/B=0.5/1 to 1.2/1), said carbon black (P) having an average particle size of 18 nm to 25 nm and a DBP oil absorption of 90 cc/100 g to 125 cc/100 g, 0.3 part to 2.5 parts by weight of large-sized carbon black or carbon graphite having an average particle size of 150 nm to 500 nm per 100 parts by weight of said carbon black, and a vinyl chloride copolymer as the resin binder, said copolymer containing at least amine-modified vinyl units and acidic functional group-containing vinyl units at the same time, so as to satisfy that the concentration of nonvolatile components is 45 to 60%, and that the P/B is 1.5/1 to 3.5/1, and then, dispersing the kneaded compound by dilution.
    • 公开了一种磁性记录介质,其制造效率,涂料稳定性和电磁特性良好,运行性能和耐久性提高,其具有形成在非磁性载体的表面侧的磁性层和形成在背面的背涂层 其中所述背涂层通过将每100重量份树脂粘合剂(B)(P / B = 0.5 / 1至1.2)包含50重量份至120重量份炭黑(P)的混合组合物 / 1),所述炭黑(P)的平均粒径为18nm〜25nm,DBP吸油量为90cc / 100g〜125cc / 100g,0.3〜2.5重量份的大尺寸 每100重量份所述炭黑具有150nm至500nm的平均粒度的碳黑或碳石墨和作为树脂粘合剂的氯乙烯共聚物,所述共聚物至少含有胺改性的乙烯基单元和酸性官能团 含乙烯基单元 以满足不挥发成分的浓度为45〜60%,P / B为1.5 / 1〜3.5 / 1,然后通过稀释分散混炼的化合物。
    • 2. 发明授权
    • Method for production of magnetic recording medium
    • 磁记录介质的制造方法
    • US5721010A
    • 1998-02-24
    • US798098
    • 1997-02-12
    • Kiyonori HinokiKiyoto FukushimaShigeo Kurose
    • Kiyonori HinokiKiyoto FukushimaShigeo Kurose
    • G11B5/70G11B5/73G11B5/735G11B5/84G11B5/842B05D5/12
    • G11B5/842G11B5/84G11B5/8404
    • This invention produces a magnetic recording medium by applying a magnetic paint for the formation of the magnetic layer and a paint for the formation of the backcoat layer severally to the nonmagnetic support, drying the applied layers of the paints, optionally subjecting the layers to a calendering treatment, performing a curing treatment on the layers thereby adjusting the surface of the backcoat layer to a surface roughness (Ra).sub.B in the range of 10 nm to 30 nm, and thereafter subjecting the surface of the backcoat layer subsequent to the curing treatment to a polishing treatment by the use of a lapping tape the abrasive layer of which has a surface roughness (Ra).sub.L in the range of 150 nm to 550 nm. In a preferred embodiment of this invention, the Mohs hardness of the abrasive grains contained in the abrasive layer is set within a prescribed range and the conditions of the curing treatment are fixed within prescribed ranges. The magnetic recording medium produced by this invention, therefore, never suffers the surface of the backcoat layer to sustain a scratch, provides thorough protection against the occurrence of instantaneous clogging and DO, and exhibits a veritably excellent running property (evinced particularly by the realization of low torque against the POM guide).
    • 本发明通过施加用于形成磁性层的磁性涂料和用于与非磁性载体分别形成背涂层的涂料来生产磁记录介质,干燥涂料的涂层,任选地使层压延 处理,对层进行固化处理,由此将背涂层的表面调整为10nm〜30nm范围内的表面粗糙度(Ra)B,然后对固化处理后的背涂层的表面进行 通过使用其研磨层的表面粗糙度(Ra)L在150nm至550nm的范围内的研磨带的抛光处理。 在本发明的一个优选实施例中,研磨层中包含的磨粒的莫氏硬度设定在规定范围内,固化处理条件固定在规定范围内。 因此,本发明生产的磁记录介质从不会受到背涂层的表面的伤害,从而提供了防止瞬时堵塞和DO发生的全面保护,并且显示出优异的运行性能(特别是通过实现 针对POM引导的低扭矩)。
    • 3. 发明授权
    • Method for producing magnetic recording medium
    • 磁记录介质的制造方法
    • US6126990A
    • 2000-10-03
    • US40438
    • 1998-03-18
    • Kiyonori HinokiKiyoto Fukushima
    • Kiyonori HinokiKiyoto Fukushima
    • G11B5/706G11B5/842B05D5/12
    • G11B5/70636G11B5/842
    • A method for producing a magnetic recording medium having low head abrasion loss and excellent mechanical strength characteristics, said medium having a magnetic layer mainly composed of a ferromagnetic powder and a binder on one surface of a non-magnetic support and a backcoat layer on the other surface of the support, wherein said ferromagnetic powder comprises chromium dioxide and cobalt-containing iron oxide within the weight ratio (wt %) range of 40:60 to 70:30, and said magnetic layer is formed of a paint prepared by a process comprising kneading cobalt-containing iron oxide and the binder at a solid concentration of 65% to 85% by weight, subsequently diluting the resulting product with the binder and a solvent, then, adding chromium dioxide thereto, followed by stirring to obtain a mixture, and subjecting the mixture to dispersion.
    • 一种具有低磁头磨耗损耗和优异的机械强度特性的磁记录介质的制造方法,所述介质具有主要由非磁性载体的一个表面上的铁磁性粉末和粘结剂构成的磁性层和另一面的背涂层 其中所述铁磁粉末包含重量比(wt%)范围为40:60至70:30的二氧化铬和含钴氧化铁,并且所述磁性层由通过包括以下步骤的方法制备的涂料形成: 以固体浓度为65〜85重量%的方式捏合含钴氧化铁和粘合剂,随后用粘合剂和溶剂稀释所得产物,然后向其中加入二氧化铬,然后搅拌以获得混合物,并且 使混合物分散。
    • 4. 发明授权
    • Method for producing magnetic recording medium
    • 磁记录介质的制造方法
    • US06117484A
    • 2000-09-12
    • US173542
    • 1998-10-16
    • Kiyonori HinokiKiyoto Fukushima
    • Kiyonori HinokiKiyoto Fukushima
    • G11B5/84G11B5/842B05D5/12
    • G11B5/8404Y10S428/90
    • Disclosed is a method for producing a magnetic recording medium comprising coating both sides of a non-magnetic support with paints for formation of coating films, followed by simultaneous drying of the respective coating films, in which the following four requirements are fulfilled, taking the amount of the paint coated on one side (a magnetic layer side) of the non-magnetic support as "W MAG" and the amount of the paint coated on the other side (a backcoat layer side) thereof as "W BC":2.0 g/m.sup.2 .ltoreq.W MAG.ltoreq.40.0 g/m.sup.2 (1)2.5 g/m.sup.2 .ltoreq.W BC.ltoreq.25.0 g/m.sup.2 (2)3 W MAG.gtoreq.-16 W BC+70 (3)9 W MAG.ltoreq.-10 W BC+385 (4)thereby being able to produce the magnetic recording medium excellent in electromagnetic characteristics, magnetic characteristics and running durability without deteriorating the appearance of a coated sheet roll.
    • 公开了一种磁记录介质的制造方法,其特征在于,包括用形成涂膜的涂料涂覆非磁性载体的两面,然后同时干燥其中符合以下四个要求的各个涂膜, 涂布在非磁性载体的一侧(磁性层侧)上的涂料为“W MAG”,涂布在另一侧(背涂层侧)上的涂料的量为“W BC”:2.0g / m2 / = - 16W BC + 70 )9W MAG