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1. 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.

2. 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.

3. 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.

4. 发明专利

JPH06162487A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH06162487A
公开(公告)日：1994-06-10
申请号：JP7175292
申请日：1992-03-30
申请人： KONISHIROKU PHOTO IND , TOSHIBA CORP
发明人： ITO TAKEO , FUKAYA TOSHIO , TAKEUCHI HAJIME
IPC分类号： C09D5/23 , C09D175/00 , C09D175/04 , G11B5/702 , G11B5/716 , G11B5/73
摘要： PURPOSE:To obtain high output in a wavelength region of a wide range and to improve a traveling property and durability by forming the magnetic layer of upper and lower layers of a double layer structure with specified magnetic powders respectively and combining the same adequate resin binder. CONSTITUTION:The output of the short wavelength region is increased by using a hexagonal ferrite powder having characteristics of 0.3 to 5 SFD, 50 to 70emmu/g saturation magnetization and 500 to 3000Oe coercive force for the upper magnetic layer. A polyurethane resin contg. a sulfonic acid group in the molecular chain and having 1000 to 100000mol.wt. and -40 to +40 deg.C Tg are used for both the upper and lower magnetic layers in a range of 4 to 40 pts.wt. per 100 pts.wt. magnetic powder. As a result, the surface characteristics are improved and the disturbance at the boundary of the upper and lower magnetic layers is eliminated, the S/N is increased and the high output from a short wavelength region to a long wavelength region is obtd. The magnetic recording medium having the increased S/N and the excellent traveling property and durability is thus obtd.

5. 发明专利

JPH06195685A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH06195685A
公开(公告)日：1994-07-15
申请号：JP7147492
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： C09D5/23 , G11B5/714 , G11B5/716 , G11B5/73
摘要： PURPOSE:To improve recording and reproducing characteristics in a wide wavelength region, durability of the medium, and reliability by constituting such an upper magnetic layer that has excellent short wavelength characteristics and causes no dropout of planar magnetic particles from the surface of the magnetic layer. CONSTITUTION:A lower magnetic layer 3 containing acicular magnetic particles 2 and resin binder and an upper magnetic layer 5 containing a resin binder and planar magnetic particles 4 having the easy-magnetized axis perpendicular to the plate surface are formed on a nonmagnetic supporting body 1. The lower magnetic layer 3 shows >=55% residual magnetic susceptibility in the in face direction of the lower magnetic layer 3 while the upper magnetic layer 5 shows >=55% residual magnetic susceptibility in the perpendicular direction. The upper magnetic layer 5 is formed to 0.05-0.7#0mm thickness. The planar magnetic particles stacked in the upper magnetic layer have 0.01-0.1mum particle size and included by 4.0-7.0 particles per 0.1mum thickness.

6. 发明专利

JPH05205251A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH05205251A
公开(公告)日：1993-08-13
申请号：JP10774492
申请日：1992-04-27
申请人： KONISHIROKU PHOTO IND , TOSHIBA CORP
发明人： OGUCHI TOSHIHIKO , TAKEUCHI HAJIME , TOBISAWA SEIICHI , FUKAYA TOSHIO , FURUHATA KENICHI
IPC分类号： C09D5/23 , C09D175/00 , C09D175/04 , G11B5/716 , G11B5/73
摘要： PURPOSE:To improve recording/reproduction output in a short-wavelength region by smoothing an upper-side magnetic layer surface extremely by providing a middle layer with a resin binder having specific characteristics as a main body between magnetic layers on the upper and lower sides. CONSTITUTION:A lower-side magnetic layer containing a magnetic powder for recording a long wavelength and a resin binder and an upper-side magnetic layer containing a magnetic powder for recording short wavelength and the resin binder are provided on a non-magnetic substrate of a magnetic recording medium. A middle layer which mainly consists of the resin binder is provided between the lower-side magnetic layer and the upper-side magnetic layer and then the amount of resin binder which is contained in the upper-side magnetic layer should be within 2-12wt.pts for 100wt.pts magnetic powder, more preferably 3-8wt.pts. An inorganic or an organic additive may be blended to the middle layer in addition to the resin binder.

7. 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.

8. 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.

9. 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.

10. 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。

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