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公开(公告)号：US5387464A
公开(公告)日：1995-02-07
申请号：US925032
申请日：1992-08-05
申请人： Kazuo Kato , Kenichi Masuyama , Hiroaki Araki , Hiroshi Hashimoto
发明人： Kazuo Kato , Kenichi Masuyama , Hiroaki Araki , Hiroshi Hashimoto
CPC分类号： G11B5/738 , G11B5/7021 , G11B5/7023 , Y10S428/90 , Y10T428/256 , Y10T428/257 , Y10T428/265 , Y10T428/31554 , Y10T428/31562 , Y10T428/31565 , Y10T428/3158 , Y10T428/31609 , Y10T428/31736 , Y10T428/3175 , Y10T428/31797 , Y10T428/31935
摘要： A magnetic recording medium is disclosed, comprising a non-magnetic support with an undercoating layer having formed thereon one or more magnetic layers. The undercoating layer contains a polyester resin or polyurethane resin having at least one polar group selected from the group consisting of --SO.sub.3 M, --OSO.sub.3 M, --COOM, and --OPO.sub.3 M.sub.2 (wherein M represents a hydrogen atom, an alkali metal, or an ammonium base, and M in different polar group or plural M's within the same polar group may be the same or different), and a glass transition temperature (Tg) of from 40.degree. C. to 80.degree. C. The magnetic layer contains a binder resin having at least one polar group selected from the same group as defined above. The recording medium has excellent adhesion between the non-magnetic support and the magnetic layer, high running durability and excellent electromagnetic characteristics.
摘要翻译： 公开了一种磁记录介质，其包括具有在其上形成有一个或多个磁性层的底涂层的非磁性载体。 底涂层含有具有至少一个选自-SO 3 M，-OSO 3 M，-COOM和-OPO 3 M 2的极性基团的聚酯树脂或聚氨酯树脂（其中M表示氢原子，碱金属或铵基 ，M不同极性基团中的M或相同极性基团中的多个M可以相同或不同），玻璃化转变温度（Tg）为40℃〜80℃。磁性层含有具有 选自与上述定义相同的至少一个极性基团。 记录介质在非磁性载体和磁性层之间具有优异的粘附性，高运行耐久性和优异的电磁特性。
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公开(公告)号：US5582910A
公开(公告)日：1996-12-10
申请号：US384797
申请日：1995-02-06
CPC分类号： G11B5/716 , G11B5/842 , Y10S428/90 , Y10T428/25 , Y10T428/256 , Y10T428/257 , Y10T428/259 , Y10T428/265 , Y10T428/30
摘要： A magnetic recording medium having improved electromagnetic characteristics and running properties is disclosed. The magnetic recording medium comprises a non-magnetic support having thereon a plurality of magnetic layers consisting of two or more layers composed of a first lower magnetic layer and a second upper magnetic layer, provided on said support by either co-coating the lower magnetic layer and the upper magnetic layer in the wet state, or coating the lower magnetic layer and then the upper magnetic layer while the lower magnetic layer is still in the wet state; wherein the cobalt-modified iron oxide is employed as the ferromagnetic powder contained in the lower magnetic layer, ferromagnetic metal is employed as the ferromagnetic powder contained in the upper magnetic layer, both the ferromagnetic powder contained in the lower magnetic layer and the ferromagnetic powder contained in the upper magnetic layer having an average major axis length of 0.25 .mu.m or less and an average acicular ratio of 10 or less, a difference in the average major axis length between the ferromagnetic powder contained in the lower magnetic layer and that contained in the upper magnetic layer of 0.08 .mu.m or less, and a difference in the average acicular ratio between the ferromagnetic powder contained in the lower layer and that contained in the upper layer of 4 or less.
摘要翻译： 公开了具有改进的电磁特性和运行特性的磁记录介质。 该磁记录介质包括非磁性载体，其上具有多个由两层或多层组成的磁性层，所述两层或更多层由第一下磁层和第二上磁层组成，所述第一下层磁性层和第二上层磁性层均设置在所述载体上， 在上部磁性层处于湿润状态，或者在下部磁性层仍然处于湿润状态的同时涂覆下部磁性层，然后涂覆上部磁性层; 其中使用钴改性的氧化铁作为包含在下磁性层中的铁磁粉末，使用强磁性金属作为包含在上磁性层中的铁磁性粉末，包含在下磁性层中的铁磁性粉末和含有铁磁性粉末 在平均长轴长度为0.25μm以下且平均针状比为10以下的上磁性层中，下磁性层中含有的铁磁性粉末与包含在下磁性层中的平均长轴长度的差异 上磁性层为0.08μm以下，下层含有的铁磁性粉末与上层中所含的铁磁性粉末的平均针状比为4以下。
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公开(公告)号：US5510177A
公开(公告)日：1996-04-23
申请号：US994522
申请日：1992-12-21
申请人： Kenichi Masuyama , Kazuo Kato , Hiroaki Araki
发明人： Kenichi Masuyama , Kazuo Kato , Hiroaki Araki
IPC分类号： G11B5/702 , C09D5/23 , C09D127/04 , C09D127/06 , C09D175/06 , G11B5/708 , G11B5/716 , G11B5/73 , B32B5/16 , G11B5/66
CPC分类号： G11B5/716 , Y10S428/90 , Y10T428/25 , Y10T428/256 , Y10T428/257 , Y10T428/259 , Y10T428/31551 , Y10T428/31663 , Y10T428/31721 , Y10T428/31725 , Y10T428/31786 , Y10T428/31855 , Y10T428/31909 , Y10T428/31935 , Y10T428/31971
摘要： A magnetic recording medium having two or more magnetic layers is disclosed, comprising a first magnetic layer and a second magnetic layer which-have been provided in this order on a surface of a nonmagnetic support, and which contain ferromagnetic particles and a binder, wherein said second magnetic layer (outermost layer) contains nonmagnetic particles having a pH of less than 7, and a Mohs' hardness of 6 or more, in an amount of from 1 to 20 parts by weight, per 100 parts by weight of the ferromagnetic particles in the second magnetic layer, and said first magnetic layer contains nonmagnetic particles having a pH of 7 or more, and a Mohs' hardness of 6 or more, in an amount of from 5 to 50 parts by weight, per 100 parts by weight of the ferromagnetic particles in the first magnetic layer.
摘要翻译： 公开了一种具有两个或多个磁性层的磁记录介质，包括在非磁性载体的表面上依次提供的第一磁性层和第二磁性层，并且含有铁磁颗粒和粘合剂，其中所述 第二磁性层（最外层）每100重量份的铁磁颗粒含有pH为小于7的非磁性颗粒，并且莫氏硬度为6或更大，为1至20重量份 所述第二磁性层和所述第一磁性层包含pH为7以上的非磁性颗粒，并且每100重量份的所述第一磁性层含有5至50重量份的莫氏硬度为6以上的莫氏硬度 第一磁性层中的铁磁颗粒。
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公开(公告)号：US5631062A
公开(公告)日：1997-05-20
申请号：US248246
申请日：1994-05-24
申请人： Kenichi Masuyama , Hiroaki Takano , Kazuo Kato , Kazuko Hanai , Noburo Hibino
发明人： Kenichi Masuyama , Hiroaki Takano , Kazuo Kato , Kazuko Hanai , Noburo Hibino
CPC分类号： G11B5/738 , G11B5/70 , Y10S428/90 , Y10T428/24355 , Y10T428/24372
摘要： A magnetic recording medium comprising a nonmagnetic support and a magnetic layer, wherein the magnetic layer is provided on one surface of the nonmagnetic support, comprises a ferromagnetic particle, and has a surface roughness of from 2 to 10 nm; the nonmagnetic support has plural layers; at least one layer of the plural layers comprises an antistatic agent; and the nonmagnetic support has a surface roughness of from 5 to 30 nm on the opposite surface to the surface on which the magnetic layer is provided.
摘要翻译： 包括非磁性载体和磁性层的磁记录介质，其中所述磁性层设置在所述非磁性载体的一个表面上，包括铁磁颗粒，并且具有2至10nm的表面粗糙度; 非磁性载体具有多层; 至少一层多层包括抗静电剂; 并且非磁性载体在与设置有磁性层的表面相反的表面上具有5至30nm的表面粗糙度。
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公开(公告)号：US5336561A
公开(公告)日：1994-08-09
申请号：US868096
申请日：1992-04-14
IPC分类号： G11B5/702 , C09D5/23 , C09D167/00 , C09D175/04 , G11B5/73 , G11B5/738 , B32B5/16 , G11B5/66
CPC分类号： G11B5/738 , Y10S428/90 , Y10T428/265 , Y10T428/31609 , Y10T428/31736 , Y10T428/31786 , Y10T428/31797
摘要： A magnetic recording medium comprising a non-magnetic support having thereon an undercoating layer and a magnetic layer, wherein the undercoating layer is provided between the non-magnetic support and magnetic layer, and a binder used for the undercoating layer comprises a resin having an elution amount of 0.05 to 0.4 mg/cm.sup.2 when placed in a mixed solvent of methyl ethyl ketone and cyclohexanone having a weight ratio of 1:1 at 25.degree. C. for 30 seconds.
摘要翻译： 一种磁记录介质，包括其上具有底涂层和磁性层的非磁性载体，其中底涂层设置在非磁性载体和磁性层之间，并且用于底涂层的粘合剂包括具有洗脱作用的树脂 在25℃下重量比为1:1的甲基乙基酮和环己酮的混合溶剂中，为0.05〜0.4mg / cm2。
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公开(公告)号：US4780365A
公开(公告)日：1988-10-25
申请号：US19286
申请日：1987-02-26
IPC分类号： C09D101/18 , C09D175/04 , G11B5/73 , G11B5/735 , G11B5/70
CPC分类号： G11B5/735 , Y10S428/90 , Y10T428/25 , Y10T428/257 , Y10T428/265
摘要： In a magnetic recording medium comprising a nonmagnetic support, a magnetic recording layer provided on one surface of said support and a back layer containing carbon black provided on another surface of said support, the improvement wherein said back layer has thickness of not larger than 0.6 .mu.m and contains an inorganic filler powder having a Mohs' scale of hardness of not less than 5, a mean particle diameter of smaller than the thickness of the back layer and not smaller than 1/5 of the thickness thereof, and the maximum particle diameter of not larger than 11/10 of the thickness of the back layer.
摘要翻译： 在包括非磁性载体的磁记录介质中，设置在所述载体的一个表面上的磁记录层和设置在所述载体的另一表面上的含有炭黑的背层，其中所述背层的厚度不大于0.6μm 并且含有莫氏硬度不小于5的无机填料粉末，平均粒径小于背层厚度，不小于其厚度的1/5，最大粒径 不大于背层厚度的11/10。
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公开(公告)号：US4614685A
公开(公告)日：1986-09-30
申请号：US598093
申请日：1984-04-09
申请人： Katsumi Ryoke , Kenichi Masuyama , Eiichi Tadokoro
发明人： Katsumi Ryoke , Kenichi Masuyama , Eiichi Tadokoro
CPC分类号： G11B5/708 , Y10S428/90 , Y10T428/25 , Y10T428/257
摘要： A magnetic recording medium comprised of a non-magnetic support base having a magnetic layer provided thereon is disclosed. The magnetic layer is comprised of carbon black having an average particle size of 30 to 50 m.mu. and an iron oxide which contains Co. The iron oxide containing the Co has a specific surface area of 25 m.sup.2 /g or more. The carbon black and the iron oxide containing the Co are dispersed in a binder. By utilizing the particular type of carbon black in combination with the particular iron oxide containing Co in the magnetic layer it is possible to greatly improve the running characteristics of the magnetic recording medium as well as obtain an improved RF output.
摘要翻译： 公开了一种磁记录介质，其包括具有设置在其上的磁性层的非磁性支撑基底。 磁性层由平均粒径为30〜50μm的碳黑和含有Co的氧化铁构成。含有Co的氧化铁的比表面积为25m 2 / g以上。 含有Co的炭黑和氧化铁分散在粘合剂中。 通过将特定类型的炭黑与在磁性层中含有Co的特定氧化铁组合使用，可以极大地改善磁记录介质的运行特性并获得改进的RF输出。
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公开(公告)号：US4626469A
公开(公告)日：1986-12-02
申请号：US505505
申请日：1983-06-17
CPC分类号： G11B5/708 , Y10S428/90 , Y10T428/25
摘要： A magnetic recording material, which comprises a magnetic layer coated on a non-magnetic support is disclosed. The magnetic layer contains both carbon black fine powder having a mean primary grain size of less than 10 m.mu. and carbon black coarse powder having a mean primary grain size in the range of 50 to 120 m.mu. in a mixing ratio ranging from 95/5 to 5/95. The material is improved in both RF output and audio output.
摘要翻译： 公开了一种磁记录材料，其包括涂覆在非磁性载体上的磁性层。 磁性层含有平均一次粒径小于10μm的炭黑细粉末和平均一次粒径在50〜120μm的范围内的混合比例为95/5的碳黑粗粉末 至5/95。 该材料在射频输出和音频输出两方面得到改进。
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公开(公告)号：US4551386A
公开(公告)日：1985-11-05
申请号：US596776
申请日：1984-04-04
申请人： Nobutaka Yamaguchi , Shinobu Iida , Masahiro Utsumi , Toshimitu Okutu , Kenichi Masuyama , Eiichi Tadokoro
发明人： Nobutaka Yamaguchi , Shinobu Iida , Masahiro Utsumi , Toshimitu Okutu , Kenichi Masuyama , Eiichi Tadokoro
CPC分类号： G11B5/735 , Y10S428/90 , Y10T428/25 , Y10T428/265 , Y10T428/30
摘要： A magnetic recording material comprised of a non-magnetic support base having provided thereon a magnetic recording layer on one side and the back layer on the other side is disclosed. The magnetic recording layer is comprised of ferromagnetic particles dispersed in a binder in combination with carbon black particles having an average primary particle size of 30 .mu.m or less. The back layer is comprised of a binder having dispersed therein carbon black having an average primary particle size in the range of 50 to 150 m.mu.. The magnetic recording material has improved electromagnetic properties and improved durability, particularly with respect to video S/N and dropout.
摘要翻译： 公开了一种磁记录材料，其包括在一侧上设置有磁记录层的非磁性支撑基底和另一侧上的背层。 磁记录层由分散在粘合剂中的铁磁颗粒与平均一次粒径为30μm以下的炭黑颗粒组合而成。 背层由其中分散有平均一次粒径在50-150μm的碳黑的粘合剂组成。 磁记录材料具有改进的电磁特性和改善的耐久性，特别是在视频S / N和压差方面。
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公开(公告)号：US4539257A
公开(公告)日：1985-09-03
申请号：US599917
申请日：1984-04-13
CPC分类号： G11B5/708 , Y10S428/90 , Y10T428/25 , Y10T428/265
摘要： A magnetic recording medium comprised of a nonmagnetic support base having a magnetic layer provided thereon is disclosed. The magnetic layer includes ferromagnetic particles dispersed in a binder in combination with carbon black particles. The carbon black particles have an average primary particle size in the range of 30 m.mu. to 50 m.mu.. Further, the carbon black is capable of the adsorption of 120 ml or more of dibutyl phthalate per 100 g of carbon black. By utilizing the particular carbon black of the present invention it is possible to obtain a magnetic recording medium having improved running properties.
摘要翻译： 公开了一种由其上设置有磁性层的非磁性支撑基体构成的磁记录介质。 磁性层包括分散在粘合剂中的炭黑颗粒与炭黑颗粒的组合。 炭黑粒子的平均一次粒径在30μm〜50μm的范围内。 此外，炭黑能够每100g炭黑吸附120ml或更多的邻苯二甲酸二丁酯。 通过利用本发明的特定炭黑，可以获得具有改善的运行特性的磁记录介质。
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