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1. 发明专利

JPH0575553B2 失效
公开(公告)号：JPH0575553B2
公开(公告)日：1993-10-20
申请号：JP22645986
申请日：1986-09-25
申请人： FUJI PHOTO FILM CO LTD
发明人： YAMAGUCHI NOBUTAKA , FUJAMA MASAAKI , SUZUKI MASAMI , YAMADA YASUYUKI
IPC分类号： B24D11/00 , G11B5/627

2. 发明专利

JPH0481250B2 失效
公开(公告)号：JPH0481250B2
公开(公告)日：1992-12-22
申请号：JP16294083
申请日：1983-09-05
申请人： FUJI PHOTO FILM CO LTD
发明人： YAMADA YASUYUKI , MUKODA YOSHIHITO
IPC分类号： C09D5/23 , C09D109/02 , C09D121/00 , C09D127/04 , C09D127/06 , C09D171/00 , C09D171/12 , C09D175/00 , C09D175/04 , G11B5/702 , G11B5/73

3. 发明专利

JPH0480450B2 失效
公开(公告)号：JPH0480450B2
公开(公告)日：1992-12-18
申请号：JP2819681
申请日：1981-02-27
申请人： FUJI PHOTO FILM CO LTD
发明人： KITAMOTO TATSUJI , SHIRAHATA RYUJI , YAMADA YASUYUKI , AKASHI GORO
IPC分类号： G11B5/66 , G11B5/64 , G11B5/65 , G11B5/702 , G11B5/71 , G11B5/72 , G11B5/84 , G11B5/85 , G11B5/851

4. 发明专利

JPH0479047B2 失效
公开(公告)号：JPH0479047B2
公开(公告)日：1992-12-14
申请号：JP8317482
申请日：1982-05-19
申请人： FUJI PHOTO FILM CO LTD
发明人： YAMADA YASUYUKI , MYOSHI TAKAHITO , OKUTSU TOSHIMITSU , FUJAMA MASAAKI
IPC分类号： C10M107/40 , C09D101/18 , C09D109/02 , C09D175/04 , C10N40/18 , G11B5/73 , G11B5/735
摘要： This invention provides a magnetic recording medium, in particular, magnetic recording tape whose coefficient of friction is decreased and running durability is improved without deteriorating the S/N property, which comprises a magnetic layer on one side of a support and a back layer on the other side thereof, the back layer containing a filler dispersed in a binder, characterized in that the binder consists essentially of a cellulose resin, a diolefin- or olefin-type synthetic rubber and a polyisocyanate.

5. 发明专利

JPH04147431A MAGNETIC RECORDING MEDIUM AND ITS MANUFACTURE 失效
公开(公告)号：JPH04147431A
公开(公告)日：1992-05-20
申请号：JP27120190
申请日：1990-10-09
申请人： FUJI PHOTO FILM CO LTD
发明人： FUJIYAMA MASAAKI , YAMADA YASUYUKI
IPC分类号： G11B5/66 , G11B5/64 , G11B5/65 , G11B5/73 , G11B5/84
摘要： PURPOSE:To improve an electromagnetic conversion characteristic and travel durability, to make the loading of a head difficult to occur, to record data for a long time and to miniaturize a device by forming a ferromagnetic metallic thin film, providing a lubricant layer and executing a pressurizing processing so that the inclination of a crystal column forming the ferromagnetic metallic thin film falls toward the direction of travel. CONSTITUTION:When the ferromagnetic metallic thin film is formed on a non- magnetic supporting by an oblique vapor diposition method, the lubricant layer is provided on it, the non-magnetic supporting is traveled in such a way that the inclination of the crystal column forming the ferromagnetic metallic thin film falls toward the direction of travel and the pressurizing processing is executed by a pressure roller, a satisfactory magnetic recording medium can be obtained even if the thickness of the non-magnetic supporting is less than about nine mum. Thus, the thin magnetic recording medium in which the electromagnetic conversion character is satisfactory, travel durability is improved and especially the loading of the head is difficult to occur can be obtained.

6. 发明专利

JPH03212814A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH03212814A
公开(公告)日：1991-09-18
申请号：JP732790
申请日：1990-01-17
申请人： FUJI PHOTO FILM CO LTD
发明人： KANAZAWA MINORU , YAMADA YASUYUKI
IPC分类号： G11B5/64 , G11B5/65 , G11B5/66
摘要： PURPOSE:To obtain the magnetic recording medium excellent in electromagnetic conversion characteristics as well as traveling durability by forming an intermediate layer on a lower layer of the uppermost ferromagnetic metal thin film layer, incorporating fine particles of specified particle size into the intermediate layer and specifying the film thickness of the uppermost ferromagnetic metal thin film layer. CONSTITUTION:The ferromagnetic metal thin film 3 of the uppermost layer has 300 - 1,500 Angstrom thickness. The intermediate layer 5 comprising fine particles of 100 - 700 Angstrom average particle size and binder resin is provided between the uppermost ferromagnetic metal thin film 3 and lower ferromagnetic metal thin film 4. The surface roughness of the nonmagnetic substrate is specified to

7. 发明专利

JPH0373408A FERROMAGNETIC THIN FILM TYPE MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH0373408A
公开(公告)日：1991-03-28
申请号：JP17241489
申请日：1989-07-04
申请人： FUJI PHOTO FILM CO LTD
发明人： YAMADA YASUYUKI , HASHIMOTO HIROSHI
IPC分类号： C09D167/02 , G11B5/64 , G11B5/66 , G11B5/738
摘要： PURPOSE:To uniformly disperse super fine particles and to improve traveling property and durability of the medium by providing a nonmagnetic intermediate layer containing a specified binder resin and super fine particles between a nonmagnetic supporting body and a magnetic layer. CONSTITUTION:The binder resin in the nonmagnetic intermediate layer between the nonmagnetic supporting body and the magnetic layer contains one of polar group -SO3M, -OH, -SO3, -COOM, -PO(OM)2, -NR2, -NR3X, (wherein M is K or hydrocarbon group, R is H or alkyl group and X is halogen atom). In the intermediate layer, super fine particles of 5 - 250 nm size are uniformly dispersed. Therefore, the nonmagnetic intermediate layer has a top surface of relatively uniform roughness, which enables constant contact with a head. Thereby, still durability and traveling property of the medium can be improved.

8. 发明专利

JPS6479935A PRODUCTION OF MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS6479935A
公开(公告)日：1989-03-24
申请号：JP23608387
申请日：1987-09-22
申请人： FUJI PHOTO FILM CO LTD
发明人： YAMANAKA HIDEO , NAGAO MAKOTO , YAMADA YASUYUKI , MORITA KAZUHIKO
IPC分类号： G11B5/84 , C10M177/00 , C10N40/18 , G11B5/64 , G11B5/66
摘要： PURPOSE:To prevent the generation of deposits to a head and to improve traveling durability by cleaning the surface of a protective layer, then providing a lubricating layer contg. an org. lubricant thereon. CONSTITUTION:The surface of the protective layer essentially consisting of carbon is cleaned by at least one selected from an alkaline detergent, neutral detergent and org. solvent at the time of providing a thin magnetic metallic film on a nonmagnetic substrate and providing the above-mentioned protective layer and the lubricating layer contg. the org. lubricant. One of >=two kinds selected from Cr, Mn, Mo, Nb, Ta, Ti, V, and W are incorporated as the additive metals into the protective layer and the content thereof is adequately specified in a 0.5-5% range.

9. 发明专利

JPS63281222A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS63281222A
公开(公告)日：1988-11-17
申请号：JP11440587
申请日：1987-05-13
申请人： FUJI PHOTO FILM CO LTD
发明人： YAMADA YASUYUKI , NAGAO MAKOTO , MORITA KAZUHIKO
IPC分类号： G11B5/708 , C09D175/14 , G11B5/72
摘要： PURPOSE:To improve still durability and traveling durability at and under a high temp. and high humidity as well as a low temp. and low humidity by disposing fine particles which are introduced from a silica sol and are specified in average grain size on the surface of a magnetic layer and incorporating a compd. which can be polymerized by projection of radiations as a binder into said particles. CONSTITUTION:The fine particles which are introduced from the silica sol and have 18-800mmu average grain size are disposed on the surface of the magnetic layer of a coating type magnetic recording medium and the compd. which can be polymerized by the projection of radiations is incorporated into the particles as the binder thereof. The grain size of the silica particles is preferably 30-400mmu. There is no effect of this invention if the silica grain size is smaller than 18mmu. On the other hand, drop-outs increase and such increase is undesirable if the grain size exceeds 800mmu. The magnetic recording medium having the excellent still durability and traveling durability at and under the high temp. and high humidity as well as the low temp. and low humidity is thereby obtd.

10. 发明专利

JPS62243117A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS62243117A
公开(公告)日：1987-10-23
申请号：JP8585886
申请日：1986-04-16
申请人： FUJI PHOTO FILM CO LTD
发明人： YAMADA YASUYUKI , MIYATSUKA HAJIME , OKITA TSUTOMU , TSUJI NOBUO
IPC分类号： C08G18/44 , C08L75/04 , C09D5/23 , C09D175/00 , C09D175/04 , C09D175/08 , G11B5/702 , G11B5/706 , G11B5/708
摘要： PURPOSE:To obtain a binder having excellent resistance to hydrolysis and an excellent electromagnetic conversion characteristic and running durability by incorporating a specific ratio of polycarbonate polyurethane into the binder. CONSTITUTION:The binder to be used together with pulverized CrO2 powder in a magnetic recording medium having a nonmagnetic base and a magnetic layer contg. the pulverized CrO2 powder dispersed in the binder on said base contains 30-90wt% polycarbonate polyurethane. Said polycarbonate polyurethane is more particularly preferably used at 40-85wt% and the other binders which can be used in combination are preferably used at 10-70wt% and more particularly preferably at 15-60wt%. The polycarbonate polyurethane is obtd. by condensing polyol, polyisocyanate and if necessary, chain extender. The hydrolysis of the binder is thereby extremely lessened when the medium is subjected to a high temp. and high humidity for a long period of time and therefore, the deterioration of the electromagnetic conversion characteristics and running durability is extremely lessened.

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