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1. 发明授权

US5547772A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US5547772A
公开(公告)日：1996-08-20
申请号：US416331
申请日：1995-04-04
申请人： Shinji Saito , Hiroshi Ogawa , Takeshi Kakuta , Hitoshi Noguchi
发明人： Shinji Saito , Hiroshi Ogawa , Takeshi Kakuta , Hitoshi Noguchi
IPC分类号： G11B5/706 , C09D5/23 , C09D127/04 , C09D127/06 , C09D175/06 , G11B5/714 , G11B5/716 , G11B5/66 , B32B3/10 , B32B5/16
CPC分类号： G11B5/716 , G11B5/714 , Y10S428/90 , Y10T428/24355 , Y10T428/25 , Y10T428/257 , Y10T428/265
摘要： The present invention is directed to a magnetic recording medium comprising a non-magnetic support having provided thereon a plurality of magnetic layers composed of a lower magnetic layer comprising a ferromagnetic powder and a binder, and an upper magnetic layer comprising a ferromagnetic powder being provided on the lower magnetic layer, wherein the ferromagnetic powder contained in the upper magnetic layer has a length of major axis not longer than 0.30 .mu.m and a crystallite size not larger than 400 .ANG., the upper magnetic layer has a dry thickness of not more than 1.20 .mu.m, and the surface of the upper magnetic layer has a center-line average surface roughness (Ra) not more than 0.015 .mu.m.
摘要翻译：本发明涉及一种磁记录介质，其包括非磁性载体，其上设置有由包含铁磁性粉末和粘合剂的下部磁性层构成的多个磁性层，以及包含铁磁性粉末的上部磁性层，所述下磁性层，其中所述上磁性层中所含的铁磁粉末的长轴长度不大于0.30μm，微晶尺寸不大于400，所述上磁性层的干厚度不大于1.20 上磁性层的表面的中心线平均表面粗糙度（Ra）不大于0.015μm。

2. 发明授权

US5035948A Magnetic recording medium and a method for preparing the medium 失效
标题翻译：磁记录介质及其制备方法
公开(公告)号：US5035948A
公开(公告)日：1991-07-30
申请号：US576103
申请日：1990-08-31
申请人： Shinji Saito , Hiroshi Ogawa
发明人： Shinji Saito , Hiroshi Ogawa
IPC分类号： C09D5/23 , G11B5/716
CPC分类号： G11B5/716 , Y10S428/90 , Y10T428/257 , Y10T428/265
摘要： A magnetic recording medium is disclosed, comprising a nonmagnetic support having thereon an under magnetic layer and an upper magnetic layer in that order, wherein the thickness of the upper magnetic layer is less than 0.5 .mu.m and abrasive agents, which have a Mohs' hardness of 6 or more and have an average particle diameter of 0.5 .mu.m or less, are contained in the upper magnetic layer. And a method for preparing a magnetic recording medium which comprises coating a coating composition for an under magnetic layer on a running non-magnetic support, and successively coating thereon a coating composition for an upper magnetic layer containing abrasive agents, which have a Mohs' hardness of 6 or more and an average particle diameter of 0.5 .mu.m or less, in a dry thickness of less than 0.5 .mu.m while the under magnetic layer is wet.
摘要翻译：公开了一种磁记录介质，其包括其上具有下磁性层和上磁性层的非磁性载体，其中上磁性层的厚度小于0.5μm，研磨剂具有莫氏硬度 6个以上，平均粒径为0.5μm以下，含有上层磁性层。一种磁记录介质的制备方法，其特征在于，在运行中的非磁性载体上涂布下层磁性层用涂料组合物，并依次在其上涂覆含有摩擦硬度的含有研磨剂的上层磁性层用涂料组合物为6个以上，平均粒径为0.5μm以下，干燥厚度小于0.5μm，而在磁性层下面是湿的。

3. 发明授权

US4980230A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US4980230A
公开(公告)日：1990-12-25
申请号：US246828
申请日：1988-09-20
申请人： Shinji Saito , Hiroshi Ogawa
发明人： Shinji Saito , Hiroshi Ogawa
IPC分类号： C09D5/23 , C09D127/04 , C09D127/06 , C09D175/00 , C09D175/04 , G11B5/702 , G11B5/716
CPC分类号： G11B5/7021 , Y10S428/90 , Y10T428/257 , Y10T428/31609
摘要： A magnetic recording medium is described, comprising a nonmagnetic support having provided thereon a first magnetic layer and a second magnetic layer in this order, each containing ferromagnetic particles, and the first and second magnetic layers each comprising at least one polyurethane resin as a binder, where the number average molecular weight of the at least one polyurethane resin contained in the first magnetic layer is 4/5 or less of that of the at least one polyurethane resin contained in the second magnetic layer.
摘要翻译：描述了一种磁记录介质，包括其上设置有第一磁性层和第二磁性层的非磁性载体，每个磁性层包含铁磁性颗粒，并且第一和第二磁性层各自包含至少一种聚氨酯树脂作为粘合剂，其中包含在第一磁性层中的至少一种聚氨酯树脂的数均分子量为包含在第二磁性层中的至少一种聚氨酯树脂的数均分子量的4/5以下。

4. 发明授权

US4946740A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US4946740A
公开(公告)日：1990-08-07
申请号：US214256
申请日：1988-07-01
申请人： Toshio Ono , Hiroshi Ogawa , Chiaki Mizuno , Shinji Saito
发明人： Toshio Ono , Hiroshi Ogawa , Chiaki Mizuno , Shinji Saito
IPC分类号： C09D5/23 , G11B5/708 , G11B5/716
CPC分类号： G11B5/716 , G11B5/708 , Y10S428/90 , Y10T428/25 , Y10T428/257 , Y10T428/265 , Y10T428/30
摘要： A magnetic recording medium is described, comprising a non-magnetic support having thereon a first magnetic layer comprising at least about 1.0 part by weight of carbon black having an average primary particle diameter of from about 20 to 80 m.mu., per 100 parts by weight of magnetic particles contained in the first magnetic layer; and on the first magnetic layer, a second magnetic layer containing from about 0.1 to less than 1.0 part by weight of carbon black having an average primary particle diameter of from about 20 to 150 m.mu., per 100 parts by weight of magnetic particles contained in the second magnetic layer. The medium has excellent electromagnetic characteristics, running durability and heat resistance.
摘要翻译：描述了一种磁记录介质，其包括非磁性载体，其上具有第一磁性层，该第一磁性层包含至少约1.0重量份的平均一次粒径为约20至80μm的碳黑，每100重量份包含在第一磁性层中的磁性颗粒; 并且在第一磁性层上，每100重量份包含的磁性颗粒含有约0.1至小于1.0重量份的平均一次粒径为约20至150μm的炭黑的第二磁性层第二磁性层。该介质具有优异的电磁特性，运行耐久性和耐热性。

5. 发明授权

US4851289A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US4851289A
公开(公告)日：1989-07-25
申请号：US150860
申请日：1988-02-01
申请人： Hiroshi Ogawa , Shinji Saito , Toshihiko Miura , Nobuo Yamazaki , Hiroaki Araki
发明人： Hiroshi Ogawa , Shinji Saito , Toshihiko Miura , Nobuo Yamazaki , Hiroaki Araki
IPC分类号： G11B5/714 , G11B5/716
CPC分类号： G11B5/716 , G11B5/714 , Y10S428/90 , Y10T428/257
摘要： A magnetic recording medium comprising a non-magnetic support having provided thereon plural magnetic layers containing ferromagnetic particles and binders, wherein the ferromagnetic particles contained in the uppermost magnetic layer have an average long axis length measured by a transmission electron microscope of 0.25 .mu.m or less and a crystal size measured by an X-ray deffractiometory of 300 .ANG. or less, and the ferromagnetic particles contained in the magnetic layers other than the uppermost layer have an average long axis length measured by a transmission electron microscope of 0.25 .mu.m or less and a crystal size measured by an X-ray deffractiometory of 250 .ANG. more, provided that the ferromagnetic particles of the uppermost layer have a crystal size measured by an X-ray deffractiometory smaller than the crystal size measured by an X-ray deffractiometory of the ferromagnetic particles of the magnetic layers other than the uppermost layer.
摘要翻译：一种磁记录媒体，其特征在于，具有非磁性载体，其上设有包含铁磁性粒子和粘合剂的多个磁性层，其中，所述最上层的磁性层中所含的铁磁性粒子的平均长轴长度为0.25μm以下的透射型电子显微镜以及通过300AWG以下的X射线折射率测定的结晶尺寸，除了最上层以外的磁性层中含有的铁磁性粒子具有0.25μm以下的透射型电子显微镜测定的平均长轴长度，通过更大的250纳米X射线衍射仪测量的晶体尺寸，条件是最上层的铁磁颗粒具有通过X射线折射率测量的晶体尺寸，该晶体尺寸小于通过铁磁性X射线分解测量的晶体尺寸除了最上层之外的磁性层的颗粒。

6. 发明授权

US4724162A Process for producing magnetic recording medium 失效
标题翻译：磁记录介质的制造方法
公开(公告)号：US4724162A
公开(公告)日：1988-02-09
申请号：US39878
申请日：1987-04-20
申请人： Shinji Saito , Hiroshi Ogawa , Chiaki Mizuno , Toshio Ono , Yasuo Tamai
发明人： Shinji Saito , Hiroshi Ogawa , Chiaki Mizuno , Toshio Ono , Yasuo Tamai
IPC分类号： B01F3/12 , G11B5/702 , G11B5/842 , H01F10/02
CPC分类号： G11B5/842 , G11B5/7028
摘要： An improvement of a process for producing a magnetic recording medium comprising coating a non-magnetic support with a magnetic paint comprising a magnetic layer forming component containing ferromagnetic powder and a resin component dispersed in an organic solvent and drying the coated layer. The improvement resides in the preparation of the magnetic paint. In the improvement, the magnetic paint is obtained by kneading said magnetic layer forming component and a first solvent having a solubility parameter of not lower than 9.5[cal..multidot.cm.sup.-3 ].sup.1/2 as measured by Small method and adding a second solvent to the resulting kneaded product so that the mixed organic solvent in the magnetic paint has a solubility parameter of lower than 9.5[cal.multidot.cm.sup.-3 ].sup.1/2 to thereby disperse the magnetic layer forming component in the organic solvent.
摘要翻译：一种制造磁记录介质的方法的改进，包括用包含含有铁磁粉末的磁性层形成组分和分散在有机溶剂中的树脂组分的磁性涂料涂覆非磁性载体并干燥涂层。改进在于磁性涂料的制备。在此改进中，磁性涂料是通过将所述磁性层形成组分和溶解度参数不低于9.5 [cal.xcm-3] 1/2的第一种溶剂进行捏合而获得的，通过Small法测量，并将第二溶剂加入到得到的混炼物，使得磁性涂料中的混合有机溶剂的溶解度参数低于9.5 [calxcm-3] 1/2，从而将磁性层形成组分分散在有机溶剂中。

7. 发明授权

US4687710A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US4687710A
公开(公告)日：1987-08-18
申请号：US898746
申请日：1986-08-18
申请人： Hiroshi Ogawa , Shinji Saito , Chiaki Mizuno , Yasuo Tamai
发明人： Hiroshi Ogawa , Shinji Saito , Chiaki Mizuno , Yasuo Tamai
IPC分类号： G11B5/708 , C09D5/23 , C09D7/12 , G11B5/71 , G11B5/73 , G11B5/704
CPC分类号： G11B5/7305 , G11B5/71 , Y10S428/90 , Y10S428/91 , Y10T428/31663
摘要： A magnetic recording medium comprising a nonmagnetic support and a magnetic recording layer provided on said support, said magnetic recording layer comprising a ferromagnetic powder dispersed in a binder, which is characterized in that said nonmagnetic support has heat shrinkage ratio of not higher than 1.0% at 110.degree. C. for 4 hours and said magnetic recording layer comprises at least one fatty acid and at least one modified silicon compound.
摘要翻译：一种包含非磁性载体和设置在所述载体上的磁记录层的磁记录介质，所述磁记录层包含分散在粘合剂中的铁磁性粉末，其特征在于，所述非磁性载体的热收缩率不高于1.0％ 110℃4小时，所述磁记录层包含至少一种脂肪酸和至少一种改性硅化合物。

8. 发明授权

US4634632A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US4634632A
公开(公告)日：1987-01-06
申请号：US680217
申请日：1984-12-10
申请人： Hiroshi Ogawa , Shinji Saito , Yasuo Tamai
发明人： Hiroshi Ogawa , Shinji Saito , Yasuo Tamai
IPC分类号： C09D5/23 , C09D127/04 , C09D127/06 , C09D175/06 , G11B5/702 , G11B5/76
CPC分类号： G11B5/7023 , Y10S428/90 , Y10T428/31609 , Y10T428/31931 , Y10T428/31935
摘要： A magnetic recording medium having excellent electromagnetic properties and satisfactory running durability prepared by mixing a highly concentrated solution of copolymers for vinyl chloride, vinyl acetate and vinyl alcohol with ferromagnetic particles and kneeding them, and then adding a solution of rubber type resins and additives thereto and dispersing them, and if desired, by adding and mixing polyisocyanate compounds therewith.
摘要翻译：通过将氯乙烯，乙酸乙烯酯和乙烯醇的共聚物的高浓度溶液与铁磁颗粒混合并对其进行加工而制备的具有优异的电磁特性和令人满意的运行耐久性的磁记录介质，然后加入橡胶类树脂和添加剂溶液，分散它们，如果需要，通过加入和混合多异氰酸酯化合物。

9. 发明授权

US5084343A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US5084343A
公开(公告)日：1992-01-28
申请号：US341467
申请日：1989-04-21
申请人： Hiroshi Ogawa , Shinji Saito
发明人： Hiroshi Ogawa , Shinji Saito
IPC分类号： G11B5/706 , C09D5/23 , C09D7/12 , G11B5/716
CPC分类号： G11B5/716 , Y10S428/90 , Y10T428/257 , Y10T428/265
摘要： A magnetic recording medium is disclosed, comprising a non-magnetic support having thereon plural magnetic layers containing ferromagnetic particles dispersed in a binder including at least one inner magnetic layer and an outer magnetic layer, wherein said ferromagnetic particles present in said outer magnetic layer are Co-FeOx (1.33.ltoreq.x.ltoreq.1.5) having a coercive force of from 800 to 1000 Oe, an average length in the long axis of less than 0.30 .mu.m as measured transmission by electronmicroscope, and a crystallite size of less than 300 .ANG. as measured by X-ray diffraction, and, the crystallite size and the thickness of the inner magnetic layer are larger than those of said outer magnetic layer.
摘要翻译：公开了一种磁记录介质，其包括非磁性载体，其上具有多个含有分散在包含至少一个内磁层和外磁性层的粘合剂中的铁磁颗粒的磁性层，其中存在于所述外磁层中的所述铁磁颗粒为Co -FeOx（1.33

10. 发明授权

US5032428A Method for producing a magnetic recording medium 失效
标题翻译：磁记录介质的制造方法
公开(公告)号：US5032428A
公开(公告)日：1991-07-16
申请号：US512228
申请日：1990-04-20
申请人： Hiroshi Ogawa , Shinji Saito , Hitoshi Noguchi
发明人： Hiroshi Ogawa , Shinji Saito , Hitoshi Noguchi
IPC分类号： G11B5/84 , B05D1/26 , B05D1/28 , G11B5/71 , G11B5/716 , G11B5/842
CPC分类号： G11B5/716 , G11B5/71 , Y10S428/90
摘要： A method for producing a magnetic recording medium is disclosed, comprising coating on a nonmagnetic support a magnetic coating composition for forming a lower magnetic layer and a magnetic coating composition for forming an upper magnetic layer using a wet-on-wet coating method, thereby forming plural magnetic layers, followed by drying, and then conducting heat treatment thereof, wherein the magnetic coating composition for the upper magnetic layer contains ferromagnetic alloy particles are ferromagnetic particles and does not contain a lubricating agent which has polar groups and has a molecular weight of 3000 or less, the magnetic coating composition for the lower magnetic layer contains ferromagnetic iron oxide particles as ferromagnetic particles, a lubricating agent having polar groups and having a molecular weight of 3000 or less, and a curing agent, the lubricating agent as well as the curing agent in the lower magnetic layer being diffused into the upper magnetic layer by the heat treatment.
摘要翻译：公开了一种制造磁记录介质的方法，其包括在非磁性载体上涂覆用于形成下磁性层的磁性涂料组合物和使用湿式湿式涂布法形成上层磁性层的磁性涂料组合物，由此形成多个磁性层，然后干燥，然后进行热处理，其中包含铁磁性合金颗粒的上磁性层的磁性涂层组合物是铁磁性颗粒，并且不含有具有极性基团并且分子量为3000的润滑剂以下的磁性涂料组合物含有作为铁磁性粒子的铁磁性氧化铁粒子，具有极性基团且分子量为3000以下的润滑剂，固化剂，润滑剂以及固化物下磁性层中的试剂通过该磁性层扩散到上磁性层中热处理。

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