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1. 发明授权

US4518626A Process for preparing magnetic recording medium 失效
标题翻译：制备磁记录介质的方法
公开(公告)号：US4518626A
公开(公告)日：1985-05-21
申请号：US566455
申请日：1983-12-28
申请人： Mikihiko Kato , Shigeo Komine , Toshio Kawamata , Kazuhiko Morita , Tsunehiko Sato
发明人： Mikihiko Kato , Shigeo Komine , Toshio Kawamata , Kazuhiko Morita , Tsunehiko Sato
IPC分类号： G11B5/845 , G11B5/84
CPC分类号： G11B5/845
摘要： A process for preparing a magnetic recording medium comprised of a non-magnetic support having a magnetic layer coated thereon is disclosed. The process involves continuously travelling an undried magnetic layer on a support through a means for magnetic orientation. The means is comprised of at least 5 magnets which are installed at intervals from each other over the undried magnetic layer or under the support. The magnets are positioned in such a manner that each adjacent pole of the magnets facing the magnetic layer or the reverse surface of the support has a different polarity and that the strength of the magnetic field of each adjacent magnet is gradually reduced toward the travelling direction of the magnetic layer. Further the magnets are positioned in such a manner that the line of direction of the magnetic force between adjacent magnets is parallel to the magnetic layer and in opposite directions, whereby the ferromagnetic fine particles in the magnetic layer are randomly oriented. When the particles are randomly oriented the magnetic material can be formed into magnetic recording discs which do not suffer from modulation which occurs with magnetic discs formed from magnetic material which has its magnetic particles oriented in a machine direction.
摘要翻译：公开了一种制备磁记录介质的方法，该记录介质由其上涂覆有磁性层的非磁性载体构成。该过程涉及通过用于磁性取向的装置连续地在支撑体上行进未干燥的磁性层。该装置包括至少5个磁体，这些磁体在未干燥的磁性层上或在支撑件下彼此间隔地安装。磁体的定位方式是使磁体的相邻磁极与磁性层或支撑体的反面具有不同的极性，并且每个相邻磁体的磁场的强度朝向磁性层。此外，磁体以这样的方式定位，使得相邻磁体之间的磁力方向线平行于磁性层并且在相反方向上，由此磁性层中的铁磁细颗粒被随机取向。当颗粒被随机取向时，磁性材料可以形成磁记录盘，其不受由磁性材料形成的磁盘而发生的调制，磁性材料的磁性颗粒沿纵向取向。

2. 发明授权

US5024885A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US5024885A
公开(公告)日：1991-06-18
申请号：US252076
申请日：1988-09-30
申请人： Yasushi Endo , Mikihiko Kato , Toshio Kawamata , Kouichi Masaki
发明人： Yasushi Endo , Mikihiko Kato , Toshio Kawamata , Kouichi Masaki
IPC分类号： G11B5/708 , C09D5/23 , G11B5/702 , G11B5/706 , G11B5/714
CPC分类号： G11B5/70678 , Y10S428/90 , Y10T428/257 , Y10T428/31569
摘要： A magnetic recording medium is described, comprising a nonmagnetic support having thereon a magnetic layer containing ferromagnetic particles which are a hexagonal system tabular particle, and which have an axis of easy magnetization in a direction of perpendicular to the major axis of the plate and are dispersed in a binder, wherein said ferromagnetic particles have a saturation magnetization of 60 emu/g or higher, a specific surface area (BET method) of from 25 to 70 m.sup.2 /g, an average particle diameter of from 0.01 to 0.2 .mu.m, and a coercive force of from 400 to 2000 oersteds, and said biner contains a resin having at least one kind of polar group in an amount of 1.times.10.sup.-5 eq/g or more of the polar group.
摘要翻译：描述了一种磁记录介质，其包括非磁性载体，其上具有包含六方晶系平板状颗粒的铁磁颗粒的磁性层，并且在垂直于该板的长轴的方向上具有容易磁化的轴并且分散在粘合剂中，其中所述铁磁性颗粒的饱和磁化强度为60emu / g以上，比表面积（BET法）为25〜70m 2 / g，平均粒径为0.01〜0.2μm，矫顽力为400〜2000奥斯特，所述膳食酒含有极性基团为1×10 -5 eq / g以上的至少1种极性基团的树脂。

3. 发明授权

US5049448A Magnetic recording medium containing an ester lubricant branched from the number 2 carbon position of the acid residue 失效
标题翻译：含有从酸残基的2碳位分支的酯润滑剂的磁记录介质
公开(公告)号：US5049448A
公开(公告)日：1991-09-17
申请号：US383514
申请日：1989-07-24
申请人： Takao Ohya , Yasuo Nishikawa , Jun Nakagawa , Fusao Yamanaka , Toshio Kawamata , Tsutomu Okita , Hiroshi Hashimoto , Mikihiko Kato
发明人： Takao Ohya , Yasuo Nishikawa , Jun Nakagawa , Fusao Yamanaka , Toshio Kawamata , Tsutomu Okita , Hiroshi Hashimoto , Mikihiko Kato
IPC分类号： C09D5/23 , G11B5/71 , G11B5/725
CPC分类号： G11B5/725 , G11B5/71 , Y10S428/90 , Y10T428/31 , Y10T428/31605 , Y10T428/31609
摘要： A magnetic recording medium is disclosed, comprising a nonmagnetic support having thereon a magnetic layer, wherein at least one of ester compounds represented by formula (I) is present in or on the magnetic layer, ##STR1## wherein R.sub.1 represents a straight chain, saturated alkyl group having 6 to 12 carbon atoms, R.sub.2 represents a straight chain, saturated alkyl group having 4 to 10 carbon atoms, and R represents a branched or straight chain alkyl group having 4 to 22 carbon atoms.
摘要翻译：公开了一种磁记录介质，其包括其上具有磁性层的非磁性载体，其中至少一种由式（I）表示的酯化合物存在于磁性层中或其上，其中R1表示直链具有6〜12个碳原子的链状饱和烷基，R2表示直链，碳原子数4〜10的饱和烷基，R表示碳原子数为4〜22的支链或直链烷基。

4. 发明授权

US5085911A Flexible magnetic disc with a two layer protective coating which top layer is a ultra violet radiation cured compound with specified elasticity modulus 失效
标题翻译：具有两层保护涂层的柔性磁性盘，其中顶层是具有指定弹性模量的超紫外线固化化合物
公开(公告)号：US5085911A
公开(公告)日：1992-02-04
申请号：US536859
申请日：1990-06-12
申请人： Mikihiko Kato , Yasushi Endo , Toshio Kawamata
发明人： Mikihiko Kato , Yasushi Endo , Toshio Kawamata
IPC分类号： G11B5/72
CPC分类号： G11B5/72 , Y10S428/90 , Y10T428/24942 , Y10T428/25 , Y10T428/265 , Y10T428/31786
摘要： A novel flexible magnetic disc is provided comprising a protective layer on the periphery of a central hole, wherein the protective layer comprises of two layers, the lower one of the two layers being a composition mainly composed of a printing ink and the upper one being a composition mainly composed of a resin obtained by irradiating a radiation-polymerizable compound with radiation so that it cures.
摘要翻译：提供了一种新颖的柔性磁盘，其包括在中心孔的周边上的保护层，其中保护层由两层组成，两层中的较低的一层为主要由印刷油墨组成的组合物，上层为组合物主要由通过用辐射照射辐射聚合性化合物而获得的树脂组成，使得其固化。

5. 发明授权

US5178925A Magnetic disc having a magnetic layer with a glass transition temperature of at least 75.degree. C. which contains magnetic metal powder of specified pH and surface area 失效
标题翻译：具有玻璃化转变温度至少为75℃的磁性层的磁盘，其含有规定pH和表面积的磁性金属粉末
公开(公告)号：US5178925A
公开(公告)日：1993-01-12
申请号：US609844
申请日：1990-11-07
申请人： Yasushi Endo , Mikihiko Kato , Yasuo Nagashima , Toshio Kawamata
发明人： Yasushi Endo , Mikihiko Kato , Yasuo Nagashima , Toshio Kawamata
IPC分类号： C09D5/23 , C09D7/12 , G11B5/702 , G11B5/706 , G11B5/712 , G11B5/714
CPC分类号： G11B5/706 , G11B5/7022 , G11B5/712 , Y10S428/90 , Y10T428/265 , Y10T428/2991 , Y10T428/3158 , Y10T428/31591 , Y10T428/31609 , Y10T428/31935
摘要： A magnetic disc having excellent running durability is disclosed, which comprises a non-magnetic support and a magnetic layer on the non-magnetic support, the layer being composed mainly of a ferromagnetic metal powder and a binder resin, wherein the ferromagnetic metal powder has a pH value of less than 7.0 and a specific surface area as determined by the BET method of at least 40 m.sup.2 /g, and the glass transition temperature of the magnetic layer is at least 75.degree. C.
摘要翻译：公开了一种具有优异的运行耐久性的磁盘，其包括非磁性支撑件和非磁性支撑件上的磁性层，该层主要由铁磁金属粉末和粘合剂树脂组成，其中铁磁性金属粉末具有 pH值小于7.0，BET法测定的比表面积为40m 2 / g以上，磁性层的玻璃化转变温度为75℃以上。

6. 发明授权

US5145738A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US5145738A
公开(公告)日：1992-09-08
申请号：US331205
申请日：1989-03-31
申请人： Mikihiko Kato , Yasushi Endo , Toshio Kawamata , Yasuo Nishikawa
发明人： Mikihiko Kato , Yasushi Endo , Toshio Kawamata , Yasuo Nishikawa
IPC分类号： C09D5/23 , C10M103/02 , C10M105/34 , C10N40/18 , G11B5/706 , G11B5/708 , G11B5/71
CPC分类号： G11B5/71 , G11B5/70605 , G11B5/708 , Y10S428/90 , Y10T428/265 , Y10T428/30
摘要： A magnetic recording medium comprising a non-magnetic support having thereon a magnetic layer comprising ferromagnetic metal powder and a binder, the magnetic layer further comprising carbon black having an average particle diameter of 250 m.mu. or more in an amount of from 1 to 10 parts by weight per 100 parts by weight of the ferromagnetic metal powder, and an ester of tridecyl alcohol with stearic acid and/or an ester of tridecyl alcohol with palmitic acid in an amount of from 5 to 20 parts by weight per 100 parts by weight of the ferromagnetic metal powder.
摘要翻译：一种磁记录介质，其特征在于，具有非磁性载体，其上具有含有铁磁性金属粉末和粘合剂的磁性层，所述磁性层还含有平均粒径为250μm以上的碳黑，其量为1〜10份的铁硬质金属粉末100重量份，十三烷醇与硬脂酸的酯和/或十三烷醇与棕榈酸的酯的量为每100重量份的5-20重量份铁磁金属粉末。

7. 发明授权

US4992328A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US4992328A
公开(公告)日：1991-02-12
申请号：US253636
申请日：1988-10-06
申请人： Mikihiko Kato , Yasushi Endo , Toshio Kawamata
发明人： Mikihiko Kato , Yasushi Endo , Toshio Kawamata
IPC分类号： G11B5/706 , G11B5/708 , G11B5/714
CPC分类号： G11B5/7085 , G11B5/70678 , G11B5/714 , Y10S428/90 , Y10T428/25 , Y10T428/257
摘要： A magnetic recording medium is disclosed, comprising a nonmagnetic support having thereon a magnetic layer containing ferromagnetic particles which are dispersed in a binder and have a tabular hexagonal crystal shape with an axis of easy magnetization perpendicular to the plate, wherein said ferromagnetic particles have a specific surface area of from 50 to less than 70 m.sup.2 /g, and further said magnetic layer contains abrasive agents having a Mohs' hardness of 6 or more and having an average particle diameter of from 0.3 to 1.0 .mu.m in an amount of from 7 to 15 parts by weight per 100 parts by weight of the ferromagnetic particles.
摘要翻译：公开了一种磁记录介质，其包括非磁性载体，其上具有包含铁磁颗粒的磁性层，所述磁性层分散在粘合剂中并且具有平板状六边形晶体形状，其具有垂直于板的易磁化轴，其中所述铁磁颗粒具有特定的表面积为50〜70m 2 / g以下，进一步，所述磁性层含有莫氏硬度为6以上，平均粒径为0.3〜1.0μm的研磨剂，其用量为7〜每100重量份铁磁颗粒为15重量份。

8. 发明授权

US5022519A Flexible disk jacket 失效
标题翻译：柔性圆盘夹克
公开(公告)号：US5022519A
公开(公告)日：1991-06-11
申请号：US659435
申请日：1984-10-10
申请人： Masakazu Iwasa , Kazuhiko Morita , Toshio Kawamata
发明人： Masakazu Iwasa , Kazuhiko Morita , Toshio Kawamata
IPC分类号： G11B23/033
CPC分类号： G11B23/0332
摘要： A flexible disk jacket for accommodating therein a disk-like magnetic recording medium to form a flexible disk is formed by folding and bonding a plastic sheet into a bag-like shape. The plastic sheet is of a composite sheet material formed by laminating an outer layer and an inner layer respectively consisting of at least one plastic layer. The outer layer is colored and has heat sealability and heat resistance. The inner layer has heat sealability and antistatic properties.
摘要翻译：通过将塑料片折叠并粘合成袋状形状而形成用于容纳盘状磁记录介质以形成柔性盘的柔性盘夹。塑料片是通过层压分别由至少一层塑料层构成的外层和内层形成的复合片材。外层着色，具有热封性和耐热性。内层具有热封性和抗静电性。

9. 发明授权

US4654258A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US4654258A
公开(公告)日：1987-03-31
申请号：US826055
申请日：1986-02-04
申请人： Toshio Kawamata , Yasuo Nishikawa , Kazuhiko Morita
发明人： Toshio Kawamata , Yasuo Nishikawa , Kazuhiko Morita
IPC分类号： C09D5/23 , G11B5/708 , G11B5/71 , G11B5/714
CPC分类号： G11B5/71 , G11B5/708 , G11B5/714 , Y10S428/90 , Y10T428/25
摘要： A magnetic recording medium is described, comprising a non-magnetic support having provided thereon a magnetic layer containing ferromagnetic particles, a binder, non-magnetic particles, and lubricating agents, wherein said magnetic layer contains (i) carbon black (A) having an average particle size of 25 m.mu. or less and a BET specific surface area of from 150 to 250 m.sup.2 /g and carbon black (B) having an average particle size of from 10 to 30 m.mu. and a BET specific surface area of 700 m.sup.2 /g or more, and (ii) a fatty acid ester and a fatty acid amide in a total amount of 7 wt % or more based on the weight of the ferromagnetic particles.
摘要翻译：描述了一种磁记录介质，其包括在其上设置有包含铁磁颗粒的磁性层，粘合剂，非磁性颗粒和润滑剂的非磁性载体，其中所述磁性层包含（i）具有平均粒径为25μm以下，BET比表面积为150〜250m 2 / g，平均粒径为10〜30μm的炭黑（B），BET比表面积为700m 2 / g以上，和（ii）总计为7重量％以上的脂肪酸酯和脂肪酸酰胺，以铁磁颗粒的重量计。

10. 发明授权

US4952444A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US4952444A
公开(公告)日：1990-08-28
申请号：US170595
申请日：1988-03-18
申请人： Toshio Kawamata , Kazuhiko Morita
发明人： Toshio Kawamata , Kazuhiko Morita
IPC分类号： G11B5/738
CPC分类号： G11B5/738 , Y10S428/90 , Y10T428/24355 , Y10T428/265
摘要： A magnetic recording medium comprising a non-magnetic support having provided thereon, in order:(a) a non-magnetic layer including at least one cellulose derivative, at least one polyurethane and at least one polyisocyanate where the concentration of the polyisocyanate is within a range of from 15 wt % to 45 wt %, and(b) a magnetic layer containing ferromagnetic particles, wherein the non-magnetic layer contains a lubricating agent and has a thickness of 1.0 .mu.m or more, a surface roughness (Ra) of 0.02 .mu.m or less, and a Young's modulus of 5.times.10.sup.4 to 50.times.10.sup.4 kg/cm.sup.2 at a temperature of from 5.degree. C. to 60.degree. C.
摘要翻译：一种磁性记录介质，包括其上提供的非磁性载体，其顺序为：（a）包含至少一种纤维素衍生物的非磁性层，至少一种聚氨酯和至少一种多异氰酸酯，其中多异氰酸酯的浓度在范围为15重量％〜45重量％，（b）含有铁磁性粒子的磁性层，其中非磁性层含有润滑剂，其厚度为1.0μm以上，表面粗糙度（Ra）为在0℃至60℃的温度下，杨氏模量为5×10 4至50×10 4 kg / cm 2。

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