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11. 发明专利

JPH04330618A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH04330618A
公开(公告)日：1992-11-18
申请号：JP443491
申请日：1991-01-18
申请人： TOSHIBA CORP
发明人： ITO TAKEO , FUKAYA TOSHIO , FURUHATA KENICHI
IPC分类号： G11B5/708 , C09D5/23 , C09D127/04 , C09D127/06 , C09D175/00 , C09D175/04 , G11B5/73
摘要： PURPOSE:To provide the high-density magnetic recording medium which is improved in the smoothness on a front surface and is improved in the reliability of various kinds of characteristics, such as traveling property and durability, under a wide range of environmental conditions. CONSTITUTION:Cyclohexanone oligomer and/or the intramolecular and intermolecular dehydrated matter derivatives of the oligomer of cyclohexanone are incorporated in addition to the magnetic powder and binder constituting the magnetic layer of the magnetic recording medium to the magnetic layer. The oligomer of the cyclohexanone, etc., have the affinity to the magnetic powder and the compatibility with the binder components, as represented by a polyurethane resin and vinyl chloride/vinyl acetate copolymer, etc., in combination and, therefore, the dispersibility of the magnetic powder into the binder is improved. The packing property of the magnetic powder is consequently enhanced and the surface of the medium is smoothed; in addition, the orientability is improved.

12. 发明专利

JPH03250422A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH03250422A
公开(公告)日：1991-11-08
申请号：JP4867590
申请日：1990-02-27
申请人： TOSHIBA CORP
发明人： FUKAYA TOSHIO , OGUCHI TOSHIHIKO
IPC分类号： G11B5/70 , C09D5/23 , C09D175/00 , C09D175/04
摘要： PURPOSE:To improve recording characteristics for high-density recording, traveling property, and durability by specifying the packing density of hexagonal ferromagnetic powder in a magnetic layer to 2.3g/cm - 3.3g/cm and the mirror surface gloss to >=160 for 60 degree incident angle. CONSTITUTION:The magnetic recording medium has a magnetic layer formed on a nonmagnetic supporting body by applying a coating material comprising hexagonal ferromagnetic powder of - 3.3g/cm and the magnetic layer is finished to have the mirror surface gloss of >=160 for 60 degree incident angle. Thereby, the obtd. medium is excellent in recording characteristics for high- density recording and excellent in traveling property and durability.

13. 发明专利

JPH01185819A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH01185819A
公开(公告)日：1989-07-25
申请号：JP1005588
申请日：1988-01-20
申请人： TOSHIBA CORP
发明人： ITO TAKEO , FUKAYA TOSHIO , FURUHATA KENICHI , SHIBUSAWA KOICHI
IPC分类号： G11B5/70 , C09D5/23 , G11B5/73 , G11B5/78
摘要： PURPOSE:To improve the head touch of a thin type tape and to obtain a magnetic recording medium suitable for high-density recording by adjusting the ratio of the stiffness between the longitudinal direction and transverse direction to a 1.2-1.8 range. CONSTITUTION:The magnetic tape which is constituted of a nonmagnetic substrate having flexibility and a magnetic layer contg. granular ferromagnetic powder formed on said substrate and contg. granular ferromagnetic powder having 0.2mum average grain size and has

14. 发明专利

JPS63168820A RECORDING MAGNETIC DISK AND ITS PRODUCTION 失效
公开(公告)号：JPS63168820A
公开(公告)日：1988-07-12
申请号：JP31186386
申请日：1986-12-30
申请人： TOSHIBA CORP
发明人： ITO TAKEO , OGUCHI TOSHIHIKO , FUKAYA TOSHIO , FURUHATA KENICHI
IPC分类号： G11B5/706 , C09D5/23 , C09D7/12 , G11B5/82
摘要： PURPOSE:To realize the high recording density and the even electromagnetic conversion characteristics of a magnetic recording disk between its inner and outer circumferences, by increasing the vertical angle type ratio of the inner circumference compared with that of the outer circumference in a vertical magnetic recording system. CONSTITUTION:A magnetic coating material 2 is dropped onto a revolving disk-shaped nonmagnetic supporter 1. In this case, the orientated magnets 3a of different polarities are set opposite to each other so that the inner circumferential sides of both magnets are put closer to the revolving surface of the supporter 1 compared with the outer circumferential sides. Thus, the magnetic powder in the material 2 is oriented when it is coated. In such a way, it is possible to obtain a magnetic recording disk which has a larger vertical orientation rate at the inner circumferential side of the supporter 1 than the outer circumferential side. As a result, the output characteristics are better unified between the inner and outer circumferential sides of the disk to satisfactorily correct an output difference caused between the inner and outer circumferential sides due to the difference of relative speeds between a magnetic head and the recording disk.

15. 发明专利

JPS62225344A MULTILAYER FILM AND MANUFACTURE THEREOF 失效
公开(公告)号：JPS62225344A
公开(公告)日：1987-10-03
申请号：JP6914486
申请日：1986-03-27
申请人： TOSHIBA CORP
发明人： ITO TAKEO , FUKAYA TOSHIO , TAKEUCHI HAJIME , YOSHIOKA SHINPEI
IPC分类号： B32B27/26 , B32B33/00 , B32B37/00

16. 发明专利

JPS62202320A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS62202320A
公开(公告)日：1987-09-07
申请号：JP4315486
申请日：1986-02-28
申请人： TOSHIBA CORP
发明人： FUKAYA TOSHIO , OGUCHI TOSHIHIKO , ITO TAKEO
IPC分类号： G11B5/702 , C09D5/23 , C09D109/00 , C09D121/00
摘要： PURPOSE:To obtain a magnetic recording medium having excellent electrostatic charge preventiveness and durability, high packing density of magnetic powder and excellent recording and reproducing output by constituting a binder of a high-polymer complex. or high-polymer material contg. the high-polymer complex. CONSTITUTION:The binder of the magnetic recording medium having the magnetic layer contg. the magnetic powder and binder on a nonmagnetic substrate is constituted of the high-polymer complex or the high-polymer material contg. the high-polymer complex. The complex obtd. by bringing part or the whole of the cyano group of the high-polymer material contg. the cyano group into reaction with copper sulfide is suitable as such high-polymer complex. A polyacrylonitrile, acrylonitrile/styrene copolymer, etc., are used for the high- polymer material contg. the cyano group. A high-polymer material having no cyano group in the molecule is also usable by incorporating the cyano group therein. A polycarbonate, PVA, etc., are used for such high-polymer material.

17. 发明专利

JPS62164219A FERROMAGNETIC POWDER FOR MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS62164219A
公开(公告)日：1987-07-20
申请号：JP411386
申请日：1986-01-14
申请人： TOSHIBA CORP
发明人： OGUCHI TOSHIHIKO , ITO TAKEO , FUKAYA TOSHIO , KURISU TOSHIHARU
IPC分类号： G11B5/706 , B22F1/02 , C09D5/23 , G11B5/712 , H01F1/06
摘要： PURPOSE:To improve the dispersibility of the titled ferromagnetic powder by using the powder obtained by bringing ferromagnetic powder into contact with resin particles in the magnetic recording medium. CONSTITUTION:The ferromagnetic powder is formed by contact of ferromagnetic powder (e.g., Co-modified delta-Fe2O3 powder) with resin particles of an elastomer having

18. 发明专利

JPS61220130A PRODUCTION OF MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS61220130A
公开(公告)日：1986-09-30
申请号：JP6150385
申请日：1985-03-26
申请人： TOSHIBA CORP
发明人： OGUCHI TOSHIHIKO , ITO TAKEO , FUKAYA TOSHIO
IPC分类号： G11B5/702 , C09D5/23 , C09D133/04 , C09D133/08 , C09D175/00 , C09D175/04 , G11B5/712 , G11B5/842
摘要： PURPOSE:To improve remarkably the dispersibility of magnetic particles and to obtain the title recording medium having excellent electromagnetic transducing characteristics by adhering the ferromagnetic fine particles to the particles of a binder resin with mechanochemical force. CONSTITUTION:Ferromagnetic fine particles having =10m /g specific surface are directly mixed without using any solvent and the ferromagnetic fine particles are adhered to the surfaces of the binder resin particles with mechanochemical force. Consequently, the ferromagnetic fine particles are firmly combined with the resin particles and the dispersibility is remarkably improved. Accordingly, a magnetic recording medium having an excellent electromagnetic transducing characteristic can be obtained by using the magnetic paint using the mechanochemical mixture.

19. 发明专利

JPS61151834A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS61151834A
公开(公告)日：1986-07-10
申请号：JP27331284
申请日：1984-12-26
申请人： TOSHIBA CORP
发明人： ITO TAKEO , FUKAYA TOSHIO , TAKEUCHI HAJIME , HIDEYAMA AKIZO
IPC分类号： G11B5/706 , C09D5/23 , C09D7/12 , G11B5/70 , G11B5/708 , G11B5/714
摘要： PURPOSE:To obtain the titled magnetic recording medium having excellent antistatic and traveling properties by electrifying positively the surface of the magnetic layer in the magnetic recording medium wherein hexagonal-system ferromagnetic powder is incorporated as the magnetic powder. CONSTITUTION:The following methods are exemplified to electrify the surface of a magnetic layer. Firstly, magnetic powder which is easy to be positively electrified is selected from hexagonal-system magnetic powder, and used as the magnetic powder. Secondly, inorg. powder having a positively electrifiable property, a surfactant capable of providing a positively electrifiable property, and an electrification controlling agent are added into a magnetic paint or dispersed in the magnetic paint. Thirdly, a magnetic paint is coated on a positively electrified base body. Fourthly, the pH of a magnetic paint is regulated and made higher than the isoelectric point to electrify positively the surface of the magnetic layer. The methods are applied separately, or a combination of the methods is applied.

20. 发明专利

JPS616677A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：JPS616677A
公开(公告)日：1986-01-13
申请号：JP12647784
申请日：1984-06-21
申请人： Toshiba Corp
发明人： FUKAYA TOSHIO , ITOU TAKEO , KUMAGAI KATSUYA , TAKEUCHI HAJIME , ONO IKUICHI
IPC分类号： G03G19/00
CPC分类号： G03G19/00
摘要： PURPOSE:To improve water resistance and moisture resistance and to eliminate hindrance to the storage of records by specifying the pH of a magnetic layer which contains hexagonal system ferrite magnetic powder containing a substituent element within a certain range. CONSTITUTION:When a recording medium is formed, proper amounts of additive, such as magnetic powder, a binder, a dispersant, and a lubricant are scaled and added to a proper solvent to prepare a magnetic paint. The pH of this magnetic paint is measured; when the pH is =7, an acidic material is added. Thus, the pH of the magnetic layer is held =3 to obtain sufficiently satisfactory water resistance and moisture resistance, thereby obtaining the recording medium which has superior running ability and durability.
摘要翻译：目的：通过将含有取代基元素的六方晶系铁氧体磁性粉末的磁性层的pH值设定在一定范围内，提高耐水性和耐湿性，消除记录存储的障碍。构成：当形成记录介质时，将适量的添加剂如磁性粉末，粘合剂，分散剂和润滑剂按比例添加到合适的溶剂中以制备磁性涂料。测量该磁性涂料的pH值; 当pH <= 3时，加入碱性物质使pH为3-7，当> = 7时，加入酸性物质。因此，为了获得足够令人满意的耐水性和耐湿性，使磁性层的pH值保持为<= 7→3，从而获得具有优异的运行能力和耐久性的记录介质。

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