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1. 发明授权

US5061516A Production method for magnetic recording medium 失效
标题翻译：磁记录介质的制作方法
公开(公告)号：US5061516A
公开(公告)日：1991-10-29
申请号：US637222
申请日：1991-01-03
申请人： Ryosuke Isobe , Kiyoshi Sawada , Kunitsuna Sasaki , Takahiro Mori , Yuki Ando
发明人： Ryosuke Isobe , Kiyoshi Sawada , Kunitsuna Sasaki , Takahiro Mori , Yuki Ando
IPC分类号： G11B5/842
CPC分类号： G11B5/842
摘要： There is disclosed the method of preparing a magnetic recording medium having an improved running durability and the excellent electromagnetic conversion characteristics, wherein the magnetic paint for a magnetic layer is prepared by the steps of:kneading the ferromagnetic powder of 100 parts by weight, the first binder of 3 to 15 parts by weight, and a solvent of 10 to 60 parts by weight under a load of a power consumption of 0.05 to 0.5 KW per kg of the ferromagnetic powder to prepare a mixture thereof;kneading the second binder and the mixture under the load of the same power consumption to prepare a coating solution.
摘要翻译：公开了制备具有改善的运行耐久性和优异的电磁转换特性的磁记录介质的方法，其中用于磁性层的磁性涂料是通过以下步骤制备的：将铁磁粉末捏合100重量份，将第一粘合剂为3〜15重量份，溶剂为10〜60重量份，功率消耗为0.05〜0.5KW / kg铁磁粉末的负荷，制备其混合物; 在相同功率的负荷下捏合第二粘合剂和混合物以制备涂布溶液。

2. 发明授权

US5094916A Magnetic recording medium comprising a polyurethane binder resin having a specified glass transition, molecular weight, and polar group content 失效
标题翻译：包含具有指定玻璃转换，分子量和极性组含量的聚氨酯粘合剂树脂的磁记录介质
公开(公告)号：US5094916A
公开(公告)日：1992-03-10
申请号：US629464
申请日：1990-12-18
申请人： Kunitsuna Sasaki , Kiyoshi Sawada , Ryosuke Isobe , Takahiro Mori , Yuki Ando
发明人： Kunitsuna Sasaki , Kiyoshi Sawada , Ryosuke Isobe , Takahiro Mori , Yuki Ando
IPC分类号： C08G18/08 , C09D5/23 , C09D175/00 , C09D175/04 , G11B5/702
CPC分类号： C08G18/0828 , G11B5/7021 , Y10S428/90 , Y10T428/3158 , Y10T428/31609
摘要： A magnetic recording medium is disclosed which has a magnetic layer comprising a ferromagnetic powder and a specific polyurethane resin as a binder. The polyurethane resin has a weight average molecular weight of not more than 30,000, a glass transition point of not higher than 0.degree. C. and a -SO.sub.3 M group, wherein M is a hydrogen atom or an alkali metal atom, in an amount of not less than 0.35% by weight in terms of sulfur atom. The recording medium is excellent in the dispersibility of the magnetic powder in the binder and has high running stability.
摘要翻译：公开了一种磁记录介质，其具有包含铁磁粉末和特定聚氨酯树脂作为粘合剂的磁性层。聚氨酯树脂的重均分子量不大于30,000，玻璃化转变点不高于0℃，-SO 3 M基团（其中M为氢原子或碱金属原子）的量不为小于0.35重量％的硫原子。记录介质的磁粉在粘合剂中的分散性优异，运行稳定性高。

3. 发明授权

US5153079A Magnetic recording medium comprising ferromagnetic powder and polar group containing ginder resins having different glass transition temperatures 失效
标题翻译：包含具有不同玻璃过渡温度的含氟碳粉和极性基团的磁性记录介质
公开(公告)号：US5153079A
公开(公告)日：1992-10-06
申请号：US806819
申请日：1991-12-06
申请人： Kunitsuna Sasaki , Kiyoshi Sawada , Ryosuke Isobe , Takahiro Mori , Yuki Ando
发明人： Kunitsuna Sasaki , Kiyoshi Sawada , Ryosuke Isobe , Takahiro Mori , Yuki Ando
IPC分类号： C09D5/23 , C09D127/04 , C09D127/06 , C09D175/00 , C09D175/04 , G11B5/702 , G11B5/714
CPC分类号： G11B5/702 , G11B5/714 , Y10T428/3158 , Y10T428/31609
摘要： A magnetic recording medium is disclosed which comprises a non-magnetic support and a magnetic layer comprising a ferromagnetic powder having a specific surface area of not less than 55 m.sup.2 /g and at least two kinds of resins each containing repetitive units having a polar group selected from the group consisting of a --SO.sub.3 M group, a --OSO.sub.3 M group, a --COOM group and a --PO(OM').sub.2 group, wherein M is a hydrogen atom or an alkali metal atom, and M' is a hydrogen atom, an alkali metal atom or an alkyl group, and the glass transition points of said two resins are different not less than 60.degree. C. from each other. The recording medium is improved in the dispersibility of the ferromagnetic powder in the magnetic layer and has a satisfactory surface smoothness, high electromagnetic conversion characteristics and a satisfactory running durability.
摘要翻译：公开了一种磁记录介质，其包括非磁性载体和包含比表面积不小于55m 2 / g的铁磁粉末和至少两种各自含有选择极性基团的重复单元的树脂的磁性层由-SO 3 M基团，-OSO 3 M基团，-COOM基团和-PO（OM'）2基团组成的基团，其中M为氢原子或碱金属原子，M'为氢原子，碱金属原子或烷基，并且所述两种树脂的玻璃化转变点彼此不低于60℃。记录介质提高了铁磁粉末在磁性层中的分散性，并且具有令人满意的表面平滑度，高电磁转换特性和令人满意的运行耐久性。

4. 发明授权

US5449527A Method of producing magnetic recording medium 失效
标题翻译：制造磁记录介质的方法
公开(公告)号：US5449527A
公开(公告)日：1995-09-12
申请号：US186979
申请日：1994-01-26
申请人： Seiichi Tobisawa , Ryosuke Isobe , Kunitsuna Sasaki
发明人： Seiichi Tobisawa , Ryosuke Isobe , Kunitsuna Sasaki
IPC分类号： C09D5/23 , G11B5/842 , H01F10/20
CPC分类号： G11B5/842
摘要： Disclosed is a method of producing a magnetic recording medium which comprises a magnetic layer, comprising a step of kneading a magnetic coating solution containing a ferromagnetic powder and a binder for the magnetic layer under a load of substantial electric power consumption of 0.05 to 0.5 KW per Kg of the ferromagnetic powder in a kneader chamber having an atmospheric water content of not more than 1 g/m.sup.3.
摘要翻译：公开了一种制造磁记录介质的方法，该磁记录介质包括磁性层，该方法包括以下步骤：在含有铁磁性粉末的磁性涂层溶液和用于磁性层的粘合剂的基础上，以0.05-0.5KW / Kg的铁磁粉末在大气含水量不超过1g / m 3的捏合机室中。

5. 发明授权

US5324571A Magnetic recording medium comprising a support and a plurality of layers in which the magnetic layer has a specified plastic deformation 失效
标题翻译：磁记录介质包括支撑体和多个层，其中磁性层具有特定的塑性变形
公开(公告)号：US5324571A
公开(公告)日：1994-06-28
申请号：US012317
申请日：1993-02-02
申请人： Noboru Koyama , Narito Goto , Ryosuke Isobe , Takahiro Mori
发明人： Noboru Koyama , Narito Goto , Ryosuke Isobe , Takahiro Mori
IPC分类号： G11B5/716 , G11B5/738 , G11B5/74 , G11B5/00
CPC分类号： G11B5/738 , G11B5/716 , G11B5/74 , Y10S428/90 , Y10T428/24942 , Y10T428/256 , Y10T428/257 , Y10T428/265
摘要： A magnetic recording medium having plural layers are disclosed. A plastic deformation of an uppermost magnetic layer is from 0.01 to 0.5 .mu.m, and a plastic deformation of the layer other than the uppermost magnetic layer is preferably from 0.01 to 0.6 .mu.m. The uppermost layer preferably has a thickness of less 0.5 .rho.m.
摘要翻译：公开了一种具有多层的磁记录介质。最上层磁性层的塑性变形为0.01〜0.5μm，最上层磁性层以外的层的塑性变形优选为0.01〜0.6μm。最上层的厚度优选为0.5μm以下。

6. 发明授权

US5242752A Magnetic recording medium comprising a specified binder resin, specified ferromagnetic metal powder and .alpha.-alumina 失效
标题翻译：包含指定的粘合剂树脂，特定的铁磁金属粉末和α-氧化铝的磁记录介质
公开(公告)号：US5242752A
公开(公告)日：1993-09-07
申请号：US787736
申请日：1991-11-04
申请人： Ryosuke Isobe , Noboru Koyama , Kenji Itozawa , Takahiro Mori
发明人： Ryosuke Isobe , Noboru Koyama , Kenji Itozawa , Takahiro Mori
IPC分类号： G11B5/702
CPC分类号： G11B5/702 , Y10S428/90 , Y10T428/257 , Y10T428/2991 , Y10T428/31507 , Y10T428/31609 , Y10T428/31786 , Y10T428/31935
摘要： A magnetic recording medium having a support and provided thereon, a magnetic layer containing a ferromagnetic metal powder and a binder is disclosed. The ferromagnetic powder comprises an adsorbed moisture of not less than 1.0 weight % and not more than 2.5 weight % of said ferromagnetic metal powder, a pH value of not less than 9.0 and not morer than 11.5, and a specific surface area of not less than 45 m.sup.2 /g measured by a BET method; and the binder comprises at least one polar group selected from the group consisting of: ##STR1## wherein M represents an atom selected from the group consisting of hydrogen, lithium, sodium, and potassium; and M.sup.1 and M.sup.2 represent atoms of hydrogen, lithium, sodium and potassium, and an alkyl group, provided that M.sup.1 and M.sup.2 may be same with or different from each other.
摘要翻译：公开了一种具有支撑并设置在其上的磁记录介质，含有铁磁金属粉末和粘合剂的磁性层。所述铁磁性粉末包含不低于所述强磁性金属粉末的1.0重量％且不超过2.5重量％的吸附水分，pH值不小于9.0且不大于11.5，比表面积不小于通过BET法测量的45m 2 / g; 并且所述粘合剂包含至少一种选自以下的极性基团：其中M表示选自氢，锂，钠和钾的原子; 并且M1和M2表示氢，锂，钠和钾的原子和烷基，条件是M1和M2可以彼此相同或不同。

7. 发明授权

US5340635A Magnetic recording medium having a magnetic layer with a specified vickers indentation hardness or plastic deformation 失效
标题翻译：具有磁性层的磁记录介质具有指定的维氏压痕硬度或塑性变形
公开(公告)号：US5340635A
公开(公告)日：1994-08-23
申请号：US888745
申请日：1992-05-22
申请人： Ryosuke Isobe , Takahiro Mori
发明人： Ryosuke Isobe , Takahiro Mori
IPC分类号： G11B5/70 , C09D5/23 , C09D7/12 , G11B5/706 , G11B5/716 , G11B5/00
CPC分类号： G11B5/716 , G11B5/70615 , Y10S428/90 , Y10T428/24355 , Y10T428/24942 , Y10T428/24983 , Y10T428/24992 , Y10T428/256
摘要： A magnetic recording medium is disclosed. The medium has a Vickers hardness of said magnetic layer being within a range from 40 to 170, an amount of plastic deformation of said magnetic layer being in a range of 0.3-0.9 .mu.m, and satisfies the relation of (A+200 B).gtoreq.180 wherein A is the value of said Vickers hardness and B is plastic deformation. The magnetic recording medium of the invention provides no contamination of calender rolls caused in the course of manufacturing thereof, and has running stability which is not affected by environmental conditions and which reduces clogging on a magnetic head.
摘要翻译：公开了一种磁记录介质。所述介质的所述磁性层的维氏硬度在40〜170的范围内，所述磁性层的塑性变形量在0.3〜0.9μm的范围内，满足（A + 200B） > / = 180其中A是维氏硬度的值，B是塑性变形。本发明的磁记录介质不会在其制造过程中产生压光辊的污染，并且具有不受环境条件影响并且减少磁头堵塞的运行稳定性。

8. 发明授权

US09324354B2 Barium ferrite magnetic storage media 有权
标题翻译：钡铁氧体磁存储介质
公开(公告)号：US09324354B2
公开(公告)日：2016-04-26
申请号：US12753718
申请日：2010-04-02
申请人： David C. Lowery , Stephen R. Ebner , Ryosuke Isobe , Larold L. Olson , Michael P. Sharrock , Scott A. Walker
发明人： David C. Lowery , Stephen R. Ebner , Ryosuke Isobe , Larold L. Olson , Michael P. Sharrock , Scott A. Walker
IPC分类号： G11B5/706 , G11B5/714 , G11B5/738
CPC分类号： G11B5/70678 , G11B5/714 , G11B5/738
摘要： Magnetic storage media that include a multilayer structure are described. In general, the magnetic storage media include a substrate, an underlayer that includes a plurality of underlayer particles formed over the substrate, and a magnetic layer that includes a plurality of magnetic particles formed over the underlayer. The magnetic layer may define a saturated magnetization and thickness product less than or equal to approximately 1.00 memu per square centimeter, and the magnetic particles may be selected from the group consisting of magnetic platelet-shaped particles and magnetic particles with an aspect ratio less than or equal to approximately 1.5. In addition, the described magnetic storage media may exhibit minimal interlayer diffusion between the underlayer and magnetic layer. Reduced interlayer diffusion between different layers of a magnetic recording medium may result in an improved magnetic recording surface for recording and storing data.
摘要翻译：描述了包括多层结构的磁存储介质。通常，磁性存储介质包括基板，包括在基板上形成的多个下层颗粒的底层，以及包含形成在该下层上的多个磁性粒子的磁性层。磁性层可以限定小于或等于约1.00毫秒/平方厘米的饱和磁化和厚度产品，并且磁性颗粒可以选自磁性粒子形颗粒和磁性颗粒，磁性颗粒和磁性颗粒的纵横比小于或等于等于大约1.5。此外，所描述的磁存储介质可能在底层和磁性层之间表现出最小的层间扩散。在磁记录介质的不同层之间减少层间扩散可导致用于记录和存储数据的改进的磁记录表面。

9. 发明授权

US07163714B2 Magnetic recording medium with dual layer front coating and method of manufacture 有权
标题翻译：具有双层前涂层的磁记录介质及其制造方法
公开(公告)号：US07163714B2
公开(公告)日：2007-01-16
申请号：US10898136
申请日：2004-07-23
申请人： David C. Lowery , Ryosuke Isobe
发明人： David C. Lowery , Ryosuke Isobe
IPC分类号： B05D5/12
CPC分类号： G11B5/84 , G11B5/70 , G11B5/7022 , G11B5/735 , G11B5/738 , Y10S428/90 , Y10T428/257 , Y10T428/2991
摘要： A magnetic recording medium including a non-magnetic substrate, a back coat, a lower layer, and a magnetic upper layer. The substrate defines a front side and back side, with the back coat being formed on the back side. The lower layer is disposed over the front side of the substrate and includes a primary powder material and conductive carbon black material dispersed in a binder. The primary lower layer powder material comprises particles having a coercivity of less than 300 Oe coated with an electroconductive material. The magnetic upper layer is disposed over the lower layer and includes a magnetic powder dispersed in a binder.
摘要翻译：包括非磁性基底，背面涂层，下层和磁性上层的磁记录介质。衬底限定了前侧和后侧，背面形成在背面。下层设置在基板的前侧，并且包括分散在粘合剂中的初级粉末材料和导电炭黑材料。初级下层粉末材料包括用导电材料涂覆的矫顽力小于300Oe的颗粒。磁性上层设置在下层上，并且包括分散在粘合剂中的磁性粉末。

10. 发明授权

US06818298B2 Magnetic recording medium with dual layer front coating and method of manufacture 失效
公开(公告)号：US06818298B2
公开(公告)日：2004-11-16
申请号：US10263378
申请日：2002-10-01
申请人： David C. Lowery , Ryosuke Isobe
发明人： David C. Lowery , Ryosuke Isobe
IPC分类号： G11B566
CPC分类号： G11B5/84 , G11B5/70 , G11B5/7022 , G11B5/735 , G11B5/738 , Y10S428/90 , Y10T428/257 , Y10T428/2991
摘要： A magnetic recording medium including a non-magnetic substrate, a back coat, a lower layer, and a magnetic upper layer. The substrate defines a front side and back side, with the back coat being formed on the back side. The lower layer is disposed over the front side of the substrate and includes a primary powder material and conductive carbon black material dispersed in a binder. The primary lower layer powder material comprises particles having a coercivity of less than 300 Oe coated with an electroconductive material. The magnetic upper layer is disposed over the lower layer and includes a magnetic powder dispersed in a binder.

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