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1. 发明授权

US5039554A Process for preparing a backing layer of a magnetic recording medium which includes the predispersing of a fine .alpha.-Al.sub.2 O.sub.3 powder in a solvent containing a small amount of binder 失效
标题翻译：制备磁记录介质背衬层的方法，该方法包括将α-Al2O3粉末预分散在含有少量粘合剂的溶剂中
公开(公告)号：US5039554A
公开(公告)日：1991-08-13
申请号：US607775
申请日：1990-10-30
申请人： Tadashi Ishikuro , Hideaki Kosha , Masaaki Fujiyama
发明人： Tadashi Ishikuro , Hideaki Kosha , Masaaki Fujiyama
IPC分类号： G11B5/84 , C09D5/23 , C09D7/12 , G11B5/73 , G11B5/733 , G11B5/735
CPC分类号： G11B5/735 , G11B5/733 , Y10S428/90 , Y10T428/25 , Y10T428/265 , Y10T428/31609
摘要： A process for preparing a magnetic recording medium by the steps of (a) forming a magnetic layer on one surface of a non-magnetic support and (b) homogeneously dispersing an .alpha.-Al.sub.2 O.sub.3 power having an average particle size of about 0.1 .mu.m or less in a solvent containing a small amount of binder to form a dispersion, mixing the thus-prepared dispersion with a binder to provide a coating composition, and applying the coating composition to the opposite surface of the nonmagnetic support to form a backing layer. The magnetic recording medium has improved wear resistance, a low friction coefficient and excellent electromagnetic properties.
摘要翻译：一种制备磁记录介质的方法，它是通过（a）在非磁性载体的一个表面上形成磁性层的步骤和（b）均匀分散平均粒径约为0.1μm的α-Al2O3粉末或较少在含有少量粘合剂的溶剂中以形成分散体，将由此制备的分散体与粘合剂混合以提供涂料组合物，并将涂料组合物施加到非磁性载体的相对表面以形成背衬层。磁记录介质具有改进的耐磨性，低摩擦系数和优异的电磁特性。

2. 发明授权

US4851288A Magnetic recording system 失效
标题翻译：磁记录系统
公开(公告)号：US4851288A
公开(公告)日：1989-07-25
申请号：US107428
申请日：1987-10-13
申请人： Tadashi Ishikuro , Kouiti Mochizuki , Masaaki Fujiyama
发明人： Tadashi Ishikuro , Kouiti Mochizuki , Masaaki Fujiyama
IPC分类号： C09D5/23 , G11B5/70 , G11B5/702 , G11B5/706
CPC分类号： G11B5/702 , G11B5/70673 , Y10S428/90 , Y10T428/257
摘要： A magnetic recording medium having a magnetic layer is disclosed, comprising co-absorbed .gamma.-iron oxide particles as ferromagnetic particles and binders, wherein coercive force of Hc of the magnetic recording medium is 850 Oe or more and the ratio of the coercive force Hc and saturated magnetic flux density Bm thereof is 0.5/l or less.
摘要翻译：公开了具有磁性层的磁记录介质，其包括作为铁磁颗粒和粘合剂的共吸收γ-氧化铁颗粒，其中磁记录介质的Hc的矫顽力为850Oe以上，矫顽力Hc和其饱和磁通密度Bm为0.5 / l以下。

3. 发明授权

US5075180A Magnetic recording medium and method for preparing the same 失效
标题翻译：磁记录介质及其制备方法
公开(公告)号：US5075180A
公开(公告)日：1991-12-24
申请号：US337780
申请日：1989-04-13
申请人： Tadashi Ishikuro , Shinobu Iida , Masaaki Fujiyama
发明人： Tadashi Ishikuro , Shinobu Iida , Masaaki Fujiyama
IPC分类号： G11B5/842 , C09D5/23 , G11B5/73 , G11B5/735
CPC分类号： G11B5/735 , Y10S428/90 , Y10T428/31609
摘要： A magnetic recording medium comprising a support having provided on one surface thereof a magnetic layer, and on the opposite surface thereof a backing layer comprising nonmagnetic particles dispersed in a binder, wherein the binder in the backing layer comprises a vinyl chloride-vinyl acetate copolymer of from 50 to 80 parts by weight, a polyester resin of from 1 to 40 parts by weight, and a polyisocyanate of from 10 to 49 parts by weight, per 100 parts by weight of the binder.
摘要翻译：一种磁记录介质，包括在其一个表面上设置有磁性层的支撑体，在其相对表面上具有分散在粘合剂中的非磁性颗粒的背衬层，其中背衬层中的粘合剂包含氯乙烯 - 乙酸乙烯酯共聚物 50〜80重量份，1〜40重量份的聚酯树脂和10〜49重量份的多异氰酸酯。

4. 发明授权

US5036629A Method for preparing a magnetic recording medium 失效
标题翻译：磁记录介质的制备方法
公开(公告)号：US5036629A
公开(公告)日：1991-08-06
申请号：US614945
申请日：1990-11-19
申请人： Tadashi Ishikuro , Shinobu Iida , Masaaki Fujiyama
发明人： Tadashi Ishikuro , Shinobu Iida , Masaaki Fujiyama
IPC分类号： G11B5/706 , G11B5/84
CPC分类号： G11B5/70678 , G11B5/84
摘要： A method for preparing a magnetic recording medium comprising a non-magnetic support having thereon a magnetic layer comprised of ferromagnetic particles of hexagonal crystalline ferrite which comprises smoothing the surface of the magnetic layer and thereafter abrading the surface thereof by an abrasive tape.
摘要翻译：一种制备磁记录介质的方法，该磁记录介质包括其上具有由六方晶结构铁氧体的铁磁性颗粒构成的磁性层的非磁性载体，该磁性层包括使磁性层的表面平滑，然后用砂带研磨其表面。

5. 发明授权

US4600638A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US4600638A
公开(公告)日：1986-07-15
申请号：US610230
申请日：1984-05-15
申请人： Tadashi Ishikuro , Ryuji Shirahata , Takahito Miyoshi , Masaaki Fujiyama
发明人： Tadashi Ishikuro , Ryuji Shirahata , Takahito Miyoshi , Masaaki Fujiyama
IPC分类号： G11B5/66 , C09C1/48 , C09D5/23 , C09D7/12 , C10M103/02 , C10M171/00 , C10N40/18 , G11B5/64 , G11B5/73 , G11B5/735 , G11B5/72
CPC分类号： G11B5/735 , Y10S428/90 , Y10T428/25 , Y10T428/256 , Y10T428/258 , Y10T428/259 , Y10T428/2967 , Y10T428/30
摘要： A magnetic recording medium is disclosed, which comprises a non-magnetic support having, on opposite surfaces thereof, a magnetic recording layer containing magnetic particles and a backing layer containing carbon black and other inorganic particles and a binder having a thickness of not more than 2.mu., the backing layer containing (a) carbon black having an average particle size of 60 to 120 m.mu. and (b) other inorganic particles having an average particle size of 20 to 100 m.mu..
摘要翻译：公开了一种磁记录介质，其包括非磁性支撑体，其相对表面上包含含有磁性颗粒的磁记录层和含有炭黑和其它无机颗粒的背衬层和厚度不大于2的粘合剂 mu，背衬层含有（a）平均粒径为60〜120μm的炭黑，（b）平均粒径为20〜100μm的其他无机粒子。

6. 发明授权

US4578311A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US4578311A
公开(公告)日：1986-03-25
申请号：US614930
申请日：1984-05-29
申请人： Tadashi Ishikuro , Ryuji Shirahata , Takahito Miyoshi , Masaaki Fujiyama
发明人： Tadashi Ishikuro , Ryuji Shirahata , Takahito Miyoshi , Masaaki Fujiyama
IPC分类号： G11B5/66 , C09C1/48 , C09D5/23 , C09D7/12 , C10M103/02 , C10M171/00 , C10N40/18 , G11B5/73 , G11B5/735 , G11B5/72
CPC分类号： G11B5/735 , Y10S428/90 , Y10T428/25 , Y10T428/265 , Y10T428/30
摘要： A magnetic recording medium is disclosed which comprises a non-magnetic support having provided on opposite surface thereof a magnetic recording layer, and a backing layer containing carbon black and a binder, said carbon having an average particle size of not less than 150 m.mu. and the weight ratio of carbon black and the binder being 1:3.0 to 1:10.
摘要翻译：公开了一种磁记录介质，其包括在其相对表面上设置有磁记录层的非磁性支撑体和包含炭黑和粘合剂的背衬层，所述碳的平均粒度不小于150μm，炭黑和粘合剂的重量比为1:3.0至1:10。

7. 发明授权

US4812330A Process 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：US4812330A
公开(公告)日：1989-03-14
申请号：US188942
申请日：1988-05-02
申请人： Tadashi Ishikuro , Masaaki Fujiyama
发明人： Tadashi Ishikuro , Masaaki Fujiyama
IPC分类号： G11B5/842 , C09D5/23 , C09D7/12 , G11B5/702 , G11B5/708 , H01F10/02
CPC分类号： G11B5/7023 , G11B5/7021 , G11B5/708 , Y10S428/90
摘要： A process for producing a magnetic recording medium is disclosed, which comprises uniformly dispersing an .alpha.-Al.sub.2 O.sub.3 powder having a particle size of not greater than 0.1 .mu.m in a dispersion medium to obtain a dispersion, adding the dispersion to a coating composition for a magnetic layer essentially comprising a binder and a ferromagnetic powder having a specific surface area of not less than about 40 m.sup.2 /g, further dispersing the mixture to prepare a coating composition for a magnetic layer, and coating the resulting coating composition on a nonmagnetic support to obtain a magnetic layer having a dry thickness of about 2 .mu.m or less. The resulting magnetic recording medium exhibits excellent electromagnetic characteristics and improved abrasion resistance.
摘要翻译：公开了一种制造磁记录介质的方法，其包括在分散介质中均匀分散粒径不大于0.1μm的α-Al2O3粉末以获得分散体，将该分散体加入用于磁性的涂料组合物层，基本上包含粘合剂和比表面积不小于约40m 2 / g的铁磁性粉末，进一步分散混合物以制备用于磁性层的涂料组合物，并将所得涂料组合物涂布在非磁性载体上以获得具有约2μm或更小干燥厚度的磁性层。所得的磁记录介质表现出优异的电磁特性和改进的耐磨性。

8. 发明授权

US5236738A Method for making magnetic recording media by kneading, dilution kneading, and dispersing a mixture of inorganic grains, binders, and solvents 失效
标题翻译：通过捏合，稀释捏合和分散无机颗粒，粘合剂和溶剂的混合物制备磁记录介质的方法
公开(公告)号：US5236738A
公开(公告)日：1993-08-17
申请号：US763482
申请日：1991-09-23
申请人： Tadashi Ishikuro , Haruo Masuda
发明人： Tadashi Ishikuro , Haruo Masuda
IPC分类号： G11B5/735 , G11B5/84
CPC分类号： G11B5/8404 , G11B5/735
摘要： A magnetic layer is overlaid on the front surface of a substrate, and a backing layer is overlaid on the back surface of the substrate. The backing layer is formed by the application of a coating composition, which contains inorganic grains and a binder, to the back surface of the substrate. The coating composition is prepared from the steps of kneading a mixture of the inorganic grains and the binder, in which the weight ratio of the inorganic grains to the binder falls within the range of 100:10 to 100:30, in a two-shaft continuous kneading and mixing machine. A dilution kneading process is then carried out on a mixture of the kneaded mixture, which results from the kneading process, and an organic solvent in a two-shaft continuous kneading and mixing machine. Thereafter a dispersion process is carried out on the diluted mixture, which results from the dilution kneading process.
摘要翻译：磁性层覆盖在基板的前表面上，背衬层覆盖在基板的背面上。背衬层通过将涂覆组合物（其含有无机颗粒和粘合剂）施加到基材的背面而形成。涂料组合物由以下步骤制备：将无机颗粒和粘合剂的混合物捏合，其中无机颗粒与粘合剂的重量比落在100:10至100:30的范围内，在双轴连续揉捏机。然后，在双轴连续捏和混合机中，对由混炼工序得到的混炼混合物和有机溶剂的混合物进行稀释混炼工序。此后，由稀释混炼工序得到的稀释混合物进行分散处理。

9. 发明授权

US4661421A Method for preparing a magnetic recording medium 失效
标题翻译：磁记录介质的制备方法
公开(公告)号：US4661421A
公开(公告)日：1987-04-28
申请号：US906008
申请日：1986-09-11
申请人： Tadashi Ishikuro , Kunihiko Honda , Masataka Ohta , Ryuji Shirahata
发明人： Tadashi Ishikuro , Kunihiko Honda , Masataka Ohta , Ryuji Shirahata
IPC分类号： G11B5/73 , G11B5/85 , G11B5/64
CPC分类号： G11B5/85 , G11B5/7305 , Y10S428/90
摘要： A method is described for preparing a magnetic recording medium by vapor-depositing a magnetic metal thin film on a polyester film, which comprises winding up a polyester film while subjecting the polyester film to a tension of from 0.1 to 2.0 kg/mm.sup.2, heating the resulting polyester film roll at 60.degree. C. to 80.degree. C. for from 10 to 100 hours, and vapor-depositing a magnetic thin film onto the polyester film while subjecting the polyester film to a tension of 0.5 kg/mm.sup.2 or more.
摘要翻译：描述了一种用于通过在聚酯膜上气相沉积磁性金属薄膜来制备磁记录介质的方法，该方法包括在聚酯薄膜经受0.1至2.0kg / mm 2的张力的同时卷绕聚酯薄膜，加热得到的聚酯薄膜在60℃至80℃下进行10至100小时，并在将聚酯薄膜施加0.5kg / mm 2以上的张力的同时将磁性薄膜气相沉积在聚酯薄膜上。

10. 发明授权

US4746559A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US4746559A
公开(公告)日：1988-05-24
申请号：US931828
申请日：1986-11-18
申请人： Yasuo Nishikawa , Tadashi Ishikuro
发明人： Yasuo Nishikawa , Tadashi Ishikuro
IPC分类号： G11B5/66 , G11B5/64 , G11B5/72 , G11B5/73
CPC分类号： G11B5/72 , Y10S428/90 , Y10T428/24273 , Y10T428/24281 , Y10T428/24364 , Y10T428/24413 , Y10T428/24975 , Y10T428/264 , Y10T428/265 , Y10T428/31678
摘要： Disclosed is a magnetic recording medium comprising a non-magnetic support having provided thereon a ferromagnetic metal thin film provided with a layer containing a compound having a mercapto group. This layer may also contain an ester bond. The magnetic recording medium shows improved running properties and wear resistance over wide ranges of temperature and humidity.
摘要翻译：公开了一种磁记录介质，其包括非磁性载体，其上设置有具有含有具有巯基的化合物的层的强磁性金属薄膜。该层也可以含有酯键。磁记录介质在宽温度和湿度范围内表现出改进的运行特性和耐磨性。

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