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1. 发明专利

JPH01185820A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH01185820A
公开(公告)日：1989-07-25
申请号：JP1005788
申请日：1988-01-20
申请人： TOSHIBA CORP
发明人： FUKAYA TOSHIO , ITO TAKEO , FURUHATA KENICHI
IPC分类号： G11B5/702 , C09D5/23 , C09D127/04 , C09D127/06 , G11B5/708
摘要： PURPOSE:To obtain a good surface characteristic and electromagnetic conversion characteristics by incorporating a resin having a sulfone group, etc., and a resin having a basic group and/or surfactant having a basic group into a magnetic layer. CONSTITUTION:The magnetic layer is so formed as to contain the resin having the sulfone group and/or the group of the metal salt of the sulfonic acid and the resin having the basic group and/or the surfactant having the basic group. The sulfone group, etc., bond to the magnetic powder in a pulverized state, more particularly superfine hexagonal magnetic powder to disperse the fine particle; further the reflocculation after the primary pulverization is prevented by the resin or surfactant having the basic group. A magnetic coating compd. having high dispersibility and high stability is thereby supplied and the magnetic recording medium which has high output and is free from coated film defects such as blobs and streaks is obtd.

2. 发明专利

JPS623422A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS623422A
公开(公告)日：1987-01-09
申请号：JP14016185
申请日：1985-06-28
申请人： TOSHIBA CORP
发明人： FUKAYA TOSHIO , ITO TAKEO , OGUCHI TOSHIHIKO
IPC分类号： C09D183/02 , G11B5/73 , G11B5/735
摘要： PURPOSE:To obtain the titled magnetic recording medium having the excellent traveling property, antistatic property and smoothness of the medium surface by allowing a lubricating agent to be present in a black-painted layer or on the surface of the layer having prescribed surface resistivity and surface roughness. CONSTITUTION:A magnetic layer is formed on the surface of a substrate and the black-painted layer is formed on the rear surface to form a magnetic recording medium. The surface resistivity of the black-painted layer having an hydroxyl group and consisting essentially of silicon oxide is regulated to OMEGA, the surface roughness of the layer is controlled to R R is allowed to exist in the black-painted layer or on the surface of the layer. In the formula, (n) is >=0 integer, R shows one kind among (CH2)lCH3, Cl, Br and O(CH2)mCH3 and (l) and (m) express >=0 integer. R and R stand for one kind among Cl, Br and O(CH2)mCH3.

3. 发明专利

JPS61220129A FERROMAGNETIC POWDER FOR MAGNETIC RECORDING MEDIUM AND ITS PRODUCTION 失效
公开(公告)号：JPS61220129A
公开(公告)日：1986-09-30
申请号：JP5946185
申请日：1985-03-26
申请人： TOSHIBA CORP
发明人： OGUCHI TOSHIHIKO , ITO TAKEO , FUKAYA TOSHIO
IPC分类号： G11B5/712 , B22F1/02 , C09D5/23 , G11B5/842 , H01F1/06
摘要： PURPOSE:To obtain the title magnetic powder having excellent miscibility and dispersibility and without generating agglomerates by bringing ferromagnetic powder into contact with the particles of a resin having a specified group such as a carboxyl group. CONSTITUTION:One or more kinds of groups selected from a carboxyl group, a sulfonic group and a phosphoric group or their metallic or ammonium salts is introduced into a resin by specified treatment. The resin is then coated on the surface of ferromagnetic powder to bring the ferromagnetic powder into contact with the specified resin. The ferromagnetic powder is brought into a paint, which is coated on a recording medium. The magnetic powder thus formed has excellent miscibility and dispersibility, agglomerates are not generated and the magnetic powder having excellent recording and reproducing output can be obtained.

4. 发明专利

JPS60209928A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：JPS60209928A
公开(公告)日：1985-10-22
申请号：JP6357484
申请日：1984-03-31
申请人： Toshiba Corp
发明人： YOKOYAMA KOUKI , HIDEYAMA AKIZOU , SATOU RIYOUICHI , FUKAYA TOSHIO , ITOU TAKEO , ITSUSHIKI MASANORI
IPC分类号： G11B5/714 , C09D5/23 , C09D7/12 , G11B5/702
摘要： PURPOSE: To obtain a magnetic recording medium which has large reproduced output and permits high-density recording by using fine magnetic material particles of which the average particle size is of a limited length and the volumetric packing rate of the fine magnetic material particles in the magnetic layer is specific % or above.
CONSTITUTION: The particle size of fine magnetic material particles consisting of hexagonal ferrite is made 0.02W0.15μm and the volumetric packing rate of the fine magnetic material particles in a magnetic layer contg. said particles is made ≥42% in a magnetic recording medium provided with said magnetic layer on a substrate. The fine magnetic material particles consisting of hexagonal ferrite are exemplified by, for example, M type (magneto-plumbite type), W type hexagonal barium ferrite, strontium ferrite, lead ferrite, orcium ferrite or the solid soln. thereof or ion substituted matter thereof. The fine magnetic material particles consisting of hexagonal ferrite having 200W2,000Oe coercive force are mainly used.
COPYRIGHT: (C)1985,JPO&Japio
摘要翻译：目的：为了获得具有大的再现输出的磁记录介质，并且通过使用平均粒径有限长度的微细磁性材料颗粒和磁性材料颗粒的体积填充率，可以进行高密度记录层是特定的％或以上。构成：由六方晶系铁氧体构成的微细磁性体粒子的粒径为0.02〜0.15μm，磁性粒子在磁性层中的体积填充率为所述颗粒在衬底上设置有所述磁性层的磁记录介质中> = 42％。由六方晶系铁氧体构成的微细磁性材料颗粒的例子有M型（磁铁 - 铅白石型），W型六角钡铁氧体，锶铁氧体，铅铁氧体，铁素体或固体溶胶。或其离子取代物。主要使用由具有200-2,000Oe矫顽力的六方晶系铁氧体组成的细磁性材料颗粒。

5. 发明专利

JPH06195687A MAGNETIC RECORDING METHOD 失效
公开(公告)号：JPH06195687A
公开(公告)日：1994-07-15
申请号：JP7175392
申请日：1992-03-30
申请人： KONISHIROKU PHOTO IND , TOSHIBA CORP
发明人： YOKOYAMA KOKI , FUKAYA TOSHIO , TAKEDA KATSUYUKI , GOTO SHIGETO
IPC分类号： C08K7/02 , C08K7/00 , C09D5/23 , G11B5/716 , G11B5/73
摘要： PURPOSE:To improve the weather resistance of a magnetic recording medium obtd. by forming a lower magnetic layer contg. acicular magnetic particles and a resin binder and an upper magnetic layer contg. magnetic powder of hexagonal ferrite and a resin binder on a nonmagnetic substrate. CONSTITUTION:The thickness of the upper magnetic layer is regulated to 0.1-0.7mum and the specific surface area of each of the upper magnetic layer and the lower magnetic layer measured by the BET method is regulated to 0.2-5 m /cm so that magnetic powder in the lower magnetic layer is hardly degenerated by reducing the amt. of harmful gas reaching the lower magnetic layer. Barium ferrite is suitable for use as the hexagonal ferrite.

6. 发明专利

JPH06195686A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH06195686A
公开(公告)日：1994-07-15
申请号：JP7175192
申请日：1992-03-30
申请人： KONISHIROKU PHOTO IND , TOSHIBA CORP
发明人： YOKOYAMA KOKI , FUKAYA TOSHIO , TAKEDA KATSUYUKI , GOTO SHIGETO
IPC分类号： C09D5/23 , G11B5/716 , G11B5/73
摘要： PURPOSE:To improve the weather resistance of a magnetic recording medium obtd. by forming a lower magnetic layer contg. acicular magnetic particles and a resin binder and an upper magnetic layer contg. magnetic powder of hexagonal ferrite and a resin binder on a nonmagnetic substrate. CONSTITUTION:The thickness of the upper magnetic layer is regulated to 0.1-0.7mum and the void volume of the upper magnetic layer is regulated to 0.5-10% so that magnetic powder in the lower magnetic layer is hardly degenerated by reducing the amt. of harmful gas reaching the lower magnetic layer. Barium ferrite is suitable for use as the hexagonal ferrite.

7. 发明专利

JPH05314467A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH05314467A
公开(公告)日：1993-11-26
申请号：JP7147392
申请日：1992-03-27
申请人： KONISHIROKU PHOTO IND , TOSHIBA CORP
发明人： FURUHATA KENICHI , FUKAYA TOSHIO , ITO TAKEO
IPC分类号： G11B5/706 , C09D5/23 , C09D127/04 , C09D127/06 , C09D175/00 , C09D175/04 , G11B5/716 , G11B5/73
摘要： PURPOSE:To improve recording and playback characteristics in a broad frequency range by forming an upper magnetic layer which has excellent short wave characteristic and gives less adverse effect on the recording condition of the regions covering from middle to longer frequency range of the lower layer. CONSTITUTION:A lower magnetic layer 3 including a needle type magnetic particle 2 and a resin binder and an upper magnetic layer 5 including a plate type particle 4 having the axis of easy magnetization perpendicular to the plate surface of particle and a resin binder are formed on a non-magnetic bearing bacterial 1. Residual magnetization coefficient in the vertical direction of both lower magnetic layer 3 and upper magnetic layer 5 is set to 55% or more, thickness of the upper magnetic layer is set to 0.05 to 0.70mum, grain size of plate type magnetic particle 4 is set to 0.01 to 0.1mum and the number of plate type particles 4 stacked within the upper magnetic layer is set to 2.0 to 5.0 pieces per thickness of 0.1mum.

8. 发明专利

JPS6344964A ROLLER COATING METHOD 失效
公开(公告)号：JPS6344964A
公开(公告)日：1988-02-25
申请号：JP18774786
申请日：1986-08-12
申请人： TOSHIBA CORP
发明人： FUKAYA TOSHIO , OGUCHI TOSHIHIKO , ITO TAKEO , FURUHATA KENICHI
IPC分类号： B05D1/28 , B05C1/08 , B05D7/04 , B05D7/24
摘要： PURPOSE:To apply high viscosity paint like magnetic paint without generating coating irregularity, by applying shaking or vibration to the paint in a paint sump to enhance the flowability thereof. CONSTITUTION:A coating roll 5 is rotated while the high viscosity magnetic paint 2 in a paint container 1 is shaken, vibrated or stirred to form a magnetic layer 7 on the polyester film 8 contacted with the coating roll 5 under pressure by a backup roll 9. In this case, as methods for enhancing the flowability of the paint, there are various methods wherein a plate is arranged in the paint in parallel to the coating roller 5 and moved or vibrated forwardly or backwardly with respect to the roller 10 and wherein a rod equipped with a rotary blade is immersed in the paint to rotate the rotary blade but the cycle of shaking, vibration or stirring is set to 1,000 times/min or less.

9. 发明专利

JPS6337821A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS6337821A
公开(公告)日：1988-02-18
申请号：JP18050286
申请日：1986-07-31
申请人： TOSHIBA CORP
发明人： OGUCHI TOSHIHIKO , FUKAYA TOSHIO , KURISU TOSHIHARU , ITO TAKEO
IPC分类号： G11B5/702 , C09D5/23 , C09D127/04 , C09D127/06 , C09D167/00 , C09D175/00 , C09D175/04 , G11B5/708
摘要： PURPOSE:To enable the complete primary granulation of a recording medium and orientation of hexagonal powder to a substrate plane and to improve the recording density by incorporating a vinyl chloride copolymer having the group of the metallic salt of a sulfonic acid and having 2,000 active hydrogen equiv. and >=5,000mol.wt. into a binder resin. CONSTITUTION:The ferromagnetic hexagonal powder having =5,000mol.wt. The vinyl chloride copolymer contains the monomer unit contg. an alkyl group of >=5C in part of the main chain or side chain thereof. The primary granulation of the recording medium is thus executed, by which the excellent recording and reproducing characteristics are obtd., and the higher-density recording is permitted.

10. 发明专利

JPS5968378A Preparation of magnetic coating 失效
标题翻译：磁性涂料的制备
公开(公告)号：JPS5968378A
公开(公告)日：1984-04-18
申请号：JP17761782
申请日：1982-10-12
申请人： Toshiba Corp
发明人： FUKAYA TOSHIO , ISHIZAWA AKIO , HIDEYAMA AKIZOU , TAKEUCHI TATSUO , KUMAGAI KATSUYA
IPC分类号： C09D5/23
摘要： PURPOSE: To prepare a magnetic coating with improved dispersibility of magnetic powder and magnetic properties, by dispersing magnetic power in a binder by use of a mixed medium consisting of an inorganic substance and a ferromagnetic metal.
CONSTITUTION: Magnetic powder is dispersed in a binder by use of a mixture of two media, one consisting of an inorganic medium and the other consisting of a ferromagnetic metal. The inorganic medium includes glass beads, alumina beads, silica beads, Ottawa sand, magnetic beads, glass ball alumina ball and sillica ball. The ferromagnetic metal medium consists of a metal which is readily magnetized when placed in a magnetic field, such as iron beads, cobalt beads, nickel beads, stainless steel beads, iron ball, cobalt ball and nickel ball.
COPYRIGHT: (C)1984,JPO&Japio
摘要翻译：目的：通过使用由无机物质和铁磁性金属组成的混合介质，将磁力分散在粘合剂中，制备具有改善的磁粉分散性和磁性能的磁性涂层。构成：磁性粉末通过使用两种介质的混合物分散在粘合剂中，一种由无机介质组成，另一种由铁磁性金属组成。无机介质包括玻璃珠，氧化铝珠，二氧化硅珠，渥太华砂，磁珠，玻璃球氧化铝球和ica球。铁磁性金属介质由金属制成，当放置在磁场中时易磁化，例如铁珠，钴珠，镍珠，不锈钢珠，铁球，钴球和镍球。

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