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71. 发明专利

JPS62248125A LONG-SIZED MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS62248125A
公开(公告)日：1987-10-29
申请号：JP9060986
申请日：1986-04-19
申请人： FUJI PHOTO FILM CO LTD
发明人： MIYOSHI TAKAHITO , TSUNOISHI YUTAKA , TAKAHASHI MASATOSHI
IPC分类号： G11B5/702 , C09D101/08 , C09D175/04 , G11B5/735
摘要： PURPOSE:To obtain a long-sized magnetic recording medium having excellent running durability and electromagnetic conversion characteristic by providing a magnetic layer on one face of a nonmagnetic base and providing a back layer formed by dispersing nonmagnetic powder in a prescribed binder on the other face. CONSTITUTION:The magnetic layer is provided on one face of the nonmagnetic base and the back layer formed by dispersing the nonmagnetic power in the binder formed of a polyurethane resin, cellulose deriv. and polyisocyanate compd. is provided on the other face. The polyurethane resin contains the repeating unit having at least one polar group selected from the groups consisting of -COOM, -SO3M, -OSO3M, -PO(OM')2, where M is a hydrogen atom, alkali metal atom, M' is a hydrogen atom, alkali metal atom, lower hydrocarbon group. The content of the repeating unit is 0.001-5mol%. The weight ratio of the polyurethane resin and cellulose deriv. is 10:90-9:1. The weight ratio of the total weight of the cellulose deriv. and relyurethane resin and the polyisocyanate compd. is 95:5-60:40.

72. 发明专利

JPS62202321A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS62202321A
公开(公告)日：1987-09-07
申请号：JP4380886
申请日：1986-02-28
申请人： FUJI PHOTO FILM CO LTD
发明人： MIYOSHI TAKAHITO , INAMI HIROO , HANAI KAZUKO , YAMADA YASUYUKI
IPC分类号： G11B5/702 , C09D5/23 , C09D127/04 , C09D127/06 , C09D175/00 , C09D175/04 , G11B5/708
摘要： PURPOSE:To maintain the mu value on the surface of a magnetic layer at a specified level by using a resin component contg. a polyurethane resin and vinyl chloride resin into which a specific ratio of polar groups are introduced and specific alpha-Al2O3. CONSTITUTION:The binder for dispersing ferromagnetic powder, lubricating agent and polishing material is formed of the resin component contg. the polyurethane resin and vinyl chloride copolymer having at least one kind of the polar groups among -COOM, -SO3M, -OSO3M and -PO(OM')2. The resin component has the polar groups at a ratio of one piece per 19,000-45,000 number average mol.wt. over the entire part of the resin component contg. the polyurethane resin and vinyl chloride copolymer. The polishing agent is the alpha-Al2O3 having

73. 发明专利

JPS62172534A PRODUCTION OF MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS62172534A
公开(公告)日：1987-07-29
申请号：JP1318386
申请日：1986-01-24
申请人： FUJI PHOTO FILM CO LTD
发明人： MIYOSHI TAKAHITO , FUJIYAMA MASAAKI
IPC分类号： G11B5/845
摘要： PURPOSE:To obtain a magnetic recording medium having an excellent electromagnetic conversion characteristic and running durability by coating a magnetic coating compd. prepd. by dispersing prescribed ferromagnetic powder mixture and resin component into an org. solvent on a nonmagnetic base and subjecting the coating layer to a treatment to attract the pulverized ferromagnetic metallic powder in the coating layer by a magnet then subjecting said layer to an orientation treatment. CONSTITUTION:The magnetic coating compd. prepd. by dispersing the magnetic layer forming components contg. the ferromagnetic powder mixture composed of ferromagnetic oxide powder and/or ferromagnetic hexagonal ferrite powder and pulverized ferromagnetic metallic powder and the resin component into the org. solvent is coated on the nonmagnetic base 1. The coating layer 2 travels in an arrow direction while the base 1 and the magnet 3 maintain the contact. The ferromagnetic powder in the coating layer 2 is attracted to the base 1 side. The magnet 3 in this stage has >=1,500 Gauss, more preferably >=2,500 Gauss magnetic flux density. The coating layer 2 is subjected to the normal orientation treatment by a magnetic field orientation treatment device 4 and is dried by a dryer 5.

74. 发明专利

JPS6295738A PRODUCTION OF MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS6295738A
公开(公告)日：1987-05-02
申请号：JP23423485
申请日：1985-10-18
申请人： FUJI PHOTO FILM CO LTD
发明人： MIYOSHI TAKAHITO , FUJIYAMA MASAAKI
IPC分类号： G11B5/84 , G11B5/85
摘要： PURPOSE:To improve the running durability of a vapor deposition type magnetic recording medium without deteriorating the electromagnetic conversion characteristic, etc., thereof by depositing a ferromagnetic metal by diagonal evaporation on a non-magnetic substrate then coating a lubricating agent thereon and smoothing the surface under pressurization. CONSTITUTION:The non-magnetic substrate is inclined at >=45 deg. with the virtual perpendicular of the surface thereof and the beam of the ferromagnetic metal is made incident thereon to deposit the may columnar ferromagnetic materials at about 0.1-0.14mum on the substrate surface. A monobasic fatty acid of 12-22 C in particular among compds. having polar groups in the molecule is then coated on the surface in a 1-10mg/1mg range. The surface thereof is then smoothed under >=200kg/cm linear pressure by bringing >=2 pieces of mirror surface rolls and the surface of the vapor deposited layer into contact with each other, then at least part of the spaces between the columnar ferromagnetic materials are crushed, by which the packing rate is improved and the contact characteristic with a magnetic head is improved. The substrate is thereafter cut to a tape having a desired width, by which the magnetic recording medium is completed.

75. 发明专利

JPS628328A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS628328A
公开(公告)日：1987-01-16
申请号：JP14712085
申请日：1985-07-04
申请人： FUJI PHOTO FILM CO LTD
发明人： MIYOSHI TAKAHITO , TOKUNAGA FUMIHIRO , INAMI HIROO , YAMAUCHI KOICHI , WATANABE YASU , USHIMARU AKIRA
IPC分类号： C09D175/04 , C09D101/18 , G11B5/73 , G11B5/735
摘要： PURPOSE:To improve an electromagnetic conversion characteristic, to decrease drop-out and to obviate the generation of the chipping of a cassette half member by using 2 kinds carbon blacks and non-magnetic powder of fine particles in a back layer. CONSTITUTION:The back layer of a magnetic recording medium having magnetic layer on one surface of a non-magnetic substrate and the back layer formed to

76. 发明专利

JPS61165824A PRODUCTION OF MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS61165824A
公开(公告)日：1986-07-26
申请号：JP728385
申请日：1985-01-17
申请人： FUJI PHOTO FILM CO LTD
发明人： MATSUFUJI AKIHIRO , OKITA TSUTOMU , MIYOSHI TAKAHITO , FUJIYAMA MASAAKI
IPC分类号： G11B5/702 , C09D5/23 , C09D101/08 , C09D175/00 , C09D175/04 , C09D175/12 , G11B5/842
摘要： PURPOSE:To obtain a magnetic recording medium having an excellent electromagnetic conversion characteristic and good durability by using a binder contg. a cellulose acetate lactate resin and/or cellulose propionate resin, polyurethane resin and/or polyurethane acrylate and compd. contg. >=2 polymerizable double bonds within the molecule as essential components. CONSTITUTION:The magnetic paint contg. the binder component contg. the cellulose acetate lactate resin and/or cellulose propionate resin, polyurethane resin and/or polyurethane (meth)acrylate and the compd. contg. >=2 polymerizable double bonds within the molecule as well as pulverous ferromagnetic powder is coated on a nonmagnetic base. The coating is subjected to a magnetic field orientation treatment prior to drying of the magnetic coating and thereafter electron rays are irradiated to the coating surface of the magnetic paint to cure the paint by which the magnetic layer is formed. The compounding ratio, by weight, of the cellulose acetate lactate resin or the cellulose propionate resin and the polyurethane resin or polyurethane (meth)acrylate which are the binder components is generally 2:8-9:1, more preferably 4:6-8:2.

77. 发明专利

JPS61165819A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS61165819A
公开(公告)日：1986-07-26
申请号：JP728285
申请日：1985-01-17
申请人： FUJI PHOTO FILM CO LTD
发明人： MIYOSHI TAKAHITO , MATSUFUJI AKIHIRO , YAMAMOTO NOBUYUKI , MIYATSUKA HAJIME , FUJIYAMA MASAAKI
IPC分类号： C09D5/23 , G11B5/708 , G11B5/714
摘要： PURPOSE:To obtain a magnetic recording medium having an excellent electromagnetic conversion characteristic and good running durability by incorporating inorg. particles having >=5 Mohs' hardness into a magnetic layer contg. pulverous ferromagnetic powder having >=42m /g specific surface area. CONSTITUTION:The inorg. particles of >=5 Mohs' hardness are incorporated into the magnetic layer contg. the ferromagnetic metallic powder having >=42m /g specific surface area. At least 90wt% of the inorg. particles consist of the particles having 0.1-0.6mum particle size and 51-85wt% thereof consists of the particles having =0.3mum particle size. The magnetic recording medium having the intended high electromagnetic conversion characteristic is hardly obtd. if the specific surface area of the pulverous ferromagnetic powder is smaller than 42m /g. The inorg. particles are likely to dislodge from the magnetic layer and since the head has hardly a polishing effect, the head clogging is liable to arise if such relatively soft inorg. particles having the Mohs' hardness lower than 5 are used.

78. 发明专利

JPS61123012A Cleaning tape 失效
标题翻译：清洁带
公开(公告)号：JPS61123012A
公开(公告)日：1986-06-10
申请号：JP24550784
申请日：1984-11-20
申请人： Fuji Photo Film Co Ltd
发明人： MIYOSHI TAKAHITO , KASUGA AKIRA , FUJIYAMA MASAAKI
IPC分类号： G11B5/41 , G11B5/708
CPC分类号： G11B5/41 , G11B5/7085
摘要： PURPOSE: To obtain a cleaning tape which eliminates the dirt stuck to a magnetic head in a short time without damaging the magnetic head, by specifying the specific surface area of an abrasive and the average roughness on the center of the surface of a cleaning layer.
CONSTITUTION: With respect to the cleaning tape consisting of a supporting body and the cleaning layer which is provided on the supporting body and contains the abrasive, the abrasive consists essentially of a ferromagnetic alloy powder having 40W65m
2 /g specific surface area, and the average roughness on the line for 0.08mm cut-off value of the surface of the cleaning layer is set within the range of 0.02W0.04μm. Thus, the cleaning tape acts effectively upon even the magnetic head brought into contact with a magnetic recording medium with a low contacting pressure and eliminates the dirt, which is stuck to the magnetic head of low hardness like a sendust composite magnetic head, in a short time without damaging the magnetic head.
COPYRIGHT: (C)1986,JPO&Japio
摘要翻译：目的：通过指定研磨剂的比表面积和清洁层表面中心的平均粗糙度，获得清洁带，其在短时间内消除粘附在磁头上的污垢而不损坏磁头。构成：对于由支撑体和设置在支撑体上并含有研磨剂的清洁层组成的清洁带，磨料基本上由具有40-65m 2 / g比表面积的铁磁性合金粉末，清洁层表面0.08mm截止值的线上的平均粗糙度设定在0.02-0.04μm的范围内。因此，即使磁头与接触压力低的磁记录介质接触，清洗带也能有效地起作用，并且在短时间内消除粘附在硬度低的磁头上的污物，如铁水复合磁头时间而不损坏磁头。

79. 发明专利

JPS6116022A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：JPS6116022A
公开(公告)日：1986-01-24
申请号：JP13649484
申请日：1984-07-03
申请人： Fuji Photo Film Co Ltd
发明人： MIYOSHI TAKAHITO , OKUTSU TOSHIMITSU , FUJIYAMA MASAAKI
IPC分类号： C09D5/23 , C09D7/12 , G11B5/73 , G11B5/735
摘要： PURPOSE: To obtain a magnetic recording medium having a back layer which is excellent in running durability by providing the back layer having a prescribed thickness, surface roughness and Young's modulus on the rear of a non-magnetic substrate having a magnetic layer.
CONSTITUTION: The back layer contg. a filler such as carbon black or CaCO
3 and having ≥2μm thickness is provided on the rear of the non-magnetic substrate (magnetic tape) having the magnetic layer. The surface roughness of the back layer is 0.05μm Ra value which is the center line average height at 0.08mm cut-off. The Young's modulus thereof is made ≤5×10
9 dyne/cm
2 . The Young's modulus of the back layer is adjusted by the kind and curing conditions of a binder resin and the kind and quantity of the filler. The surface roughness of the back layer can be adjusted by changing the dispersion method and dispersion time of a coating liquid and the grain size of the filler. The magnetic recording medium having the excellent running stability is thus obtd.
COPYRIGHT: (C)1986,JPO&Japio
摘要翻译：目的：通过在具有磁性层的非磁性基材的背面上设置具有规定厚度的背层，表面粗糙度和杨氏模量，来获得具有优良的耐久性的背层的磁记录介质。构成：背面层在具有磁性层的非磁性基板（磁带）的背面上设置具有> =2μm厚度的诸如炭黑或CaCO 3的填料。背层的表面粗糙度为0.05μmRa值，其中心线平均高度为0.08mm。隔断。其杨氏模量为<= 5×10 9达因/ cm 2。背层的杨氏模量通过粘合剂树脂的种类和固化条件以及填料的种类和数量来调节。背层的表面粗糙度可以通过改变涂布液的分散方法和分散时间以及填料的粒径来调节。因此，具有优异的运行稳定性的磁记录介质。

80. 发明专利

JPS6113433A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：JPS6113433A
公开(公告)日：1986-01-21
申请号：JP13328484
申请日：1984-06-29
申请人： Fuji Photo Film Co Ltd
发明人： MIYOSHI TAKAHITO , FUJIYAMA MASAAKI
IPC分类号： C09D5/23 , C09D127/04 , C09D127/06 , C09D175/00 , C09D175/04 , G11B5/73 , G11B5/738
摘要： PURPOSE: To improve the long-term durability of a thin Al film layer without spoiling the characteristic thereof by providing the thin Al layer on a non-magnetic substrate and forming a protective layer consisting of an Al oxide film on the surface.
CONSTITUTION: The thin Al film layer to be provided on the substrate is preferably 300Å in thickness and the thin Al film is formed on the substrate by a vapor deposition or plating method. The thickness of the Al oxide film is preferably ≥10Å and the Al oxide film is formed on the surface of the thin Al film by passing the non-magnetic substrate deposited with Al by evaporation in a zone kept at and under a prescribed temp. and humidity or is passed through the inside of a gaseous atm. which permits prescribed oxidation. The direct contact of the thin Al film and the magnetic layer is prevented and the effect of preventing the electrification and the adhesiveness to the magnetic layer are maintained for a long period of time when the Al oxide film is provided. It is also possible to provide a suitable resin primer coating layer between the Al oxide film and the magnetic layer to improve strength.
COPYRIGHT: (C)1986,JPO&Japio
摘要翻译：目的：通过在非磁性基板上设置薄的Al层并且在表面上形成由Al氧化物膜构成的保护层，来改善薄的Al膜层的长期耐久性而不破坏其特性。构成：在基板上设置的薄Al膜层的厚度优选为300，薄膜通过气相沉积法或电镀法形成在基板上。 Al氧化物膜的厚度优选为> 10埃，并且通过使通过蒸发沉积Al的非磁性基底通过在保持在规定温度和低于规定温度的区域中而在Al薄膜的表面上形成Al氧化物膜。湿度或通过气态大气的内部。这允许规定的氧化。防止薄Al膜和磁性层的直接接触，并且在设置Al氧化物膜的情况下长时间保持防止带电和对磁性层的粘附性的效果。也可以在Al氧化膜和磁性层之间提供合适的树脂底漆涂层，以提高强度。

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