公开(公告)号：EP0105705A3

公开(公告)日：1986-03-19

申请号：EP83305815

申请日：1983-09-28

Applicant: HITACHI, LTD. ,  Hitachi Maxell Ltd.

Inventor： Uesaka, Yasutaro ,  Hishiyama, Sadao ,  Kitada, Masahiro ,  Shimizu, Noboru ,  Tanabe, Hideo ,  Fujiwara, Hideo

IPC: G11B05/66 ,  G11B05/70

CPC classification number: G11B5/00 ,  G11B5/66 ,  G11B5/70 ,  Y10S428/90 ,  Y10T428/24975

Abstract: in a perpendicular magnetic recording medium comprising a high permeability film (3) and a perpendicular magnetization film (4) which are laminated on a non-magnetic substrate (1), a perpendicular magnetic recording medium (5) is provided wherein a permanent magnet film (2) is further sandwiched between the non-magnetic substrate (1) and the high permeability film (3), thereby eliminating a spike noise.

公开(公告)号：EP0095070A3

公开(公告)日：1986-02-05

申请号：EP83104394

申请日：1983-05-04

Applicant: KABUSHIKI KAISHA TOSHIBA

Inventor： Oguchi, Toshihiko Tokyo Shibaura Denki K.K. ,  Kato, Hirohisa Tokyo Shibaura Denki K.K. ,  Wada, Moriyasu Tokyo Shibaura Denki K.K. ,  Asano, Toshimitsu Tokyo Shibaura Denki K.K.

IPC: G11B05/70 ,  H01F01/11 ,  H01F01/08

CPC classification number: G11B5/70678 ,  G11B5/70626 ,  G11B5/714 ,  Y10S428/90 ,  Y10T428/256 ,  Y10T428/257 ,  Y10T428/258

Abstract: Disclosed is a magnetic recording medium, characte-, rized in that 5 to 100 parts by weight of hexagonal ferrite particles having an average particle diameter of 0.01 to 0.2 µm and 100 parts by weight of ferromagnetic particles having a saturation magnetization of 70 to 220 emu/g and an average particle diameter larger than that of the hexagonal ferrite particles are dispersed in a resinous binder.

公开(公告)号：EP0125150A3

公开(公告)日：1986-01-15

申请号：EP84303179

申请日：1984-05-10

Applicant: KONISHIROKU PHOTO INDUSTRY CO. LTD.

Inventor： Issei, Nakamura ,  Kazumasa, Matsumoto

IPC: G11B05/70 ,  H01F01/08 ,  H01F01/06

CPC classification number: G11B5/70605 ,  Y10S428/90 ,  Y10T428/256 ,  Y10T428/257 ,  Y10T428/31609

Abstract: A magnetic recording medium is disclosed which comprises a support having formed thereon a magnetic layer containing a magnetic metallic powder with no change in its differential thermal curve up to a temperature of at least 80°C. Said magnetic metallic powder contains at least one metal which is iron, nickel and cobalt with or without at least one other element, such as Fe-Ni-Co, Fe-Mn-Zn, Fe-Co-Ni-P, Fe-Ni-Zn, Fe-Ni-Cr-P, Fe-Co-Ni-Cr, Fe-Co-P, Fe-Ni, Fe-Ni-Mn, Co-Ni, Co-Ni-P, Fe-Al, Fe-Mn-Zn or Fe-AI-P.

Abstract translation: 公开了一种磁记录介质，其包括其上形成有包含磁性金属粉末的磁性层的载体，其差热曲线在至少80℃的温度下没有变化。 所述磁性金属粉末含有至少一种铁，镍和钴的金属，其具有或不具有至少一种其它元素，例如Fe-Ni-Co，Fe-Mn-Zn，Fe-Co-Ni-P，Fe-Ni -Zn，Fe-Ni-Cr-P，Fe-Co-Ni-Cr，Fe-Co-P，Fe-Ni，Fe-Ni-Mn，Co-Ni，Co-Ni-P，Fe-Al，Fe -Mn-Zn或Fe-Al-P。

公开(公告)号：EP0052210A3

公开(公告)日：1983-09-07

申请号：EP81107883

申请日：1981-10-03

Applicant: BASF Aktiengesellschaft

Inventor： Hibst, Hartmut, Dr. ,  Jakusch, Helmut, Dr.

IPC: H01F01/11 ,  C01G49/00 ,  G11B05/70

CPC classification number: C01G49/0036 ,  C01P2004/20 ,  C01P2004/62 ,  C01P2006/12 ,  C01P2006/42 ,  G11B5/706 ,  G11B5/70626

公开(公告)号：EP0131923A3

公开(公告)日：1987-03-25

申请号：EP84108220

申请日：1984-07-12

Applicant: HERCULES INCORPORATED

Inventor： Dasgupta, Sunil Priya

IPC: G11B05/70

CPC classification number: G11B5/708 ,  Y10S428/90

Abstract: Described are coating compositions having improved antistatic properties and particularly magnetic coating compositions suitable for magnetic recording media. The compositions comprise at least one film-forming synthetic resin and, based on coating solids, from about 0.2 to about 10% of an alkali, alkaline earth, ammonium or amine salt of a perfluoroa-Ikyl sulfonic acid or carboxylic acid.

公开(公告)号：EP0164251A3

公开(公告)日：1986-12-10

申请号：EP85303830

申请日：1985-05-30

Applicant: TODA KOGYO CORP.

Inventor： Nagai, Norimichi ,  Sugita, Norio ,  Horiishi, Nanao ,  Kiyama, Masao ,  Takada, Toshio

IPC: C01G49/02 ,  G11B05/70 ,  H01F01/11

CPC classification number: B82Y30/00 ,  C01G49/0036 ,  C01G49/009 ,  C01G51/006 ,  C01P2002/54 ,  C01P2002/72 ,  C01P2004/20 ,  C01P2004/62 ,  C01P2004/64 ,  C01P2004/80 ,  C01P2006/12 ,  C01P2006/42 ,  C01P2006/60 ,  G11B5/70678 ,  Y10S428/90 ,  Y10T428/2991

Abstract: Plate-like particles having a magnetization (M) of more than 40 emu/g in a magnetic field of 7.96 x 10 5 Am -1 (10 KOe), a coercive force of 2.39 x 10 4 to 7,96 x 10 4 Am -1 (300 to 1000 Oe) and an average particle diameter of from 0.05 to 0.3 µm and comprising plate-like barium ferrite particles represented by the formula:
wherein x is from 0 to 1.2 and M represents Co(II) or Co(II) and a divalent metal ion other than Co(II), whose surface is modified with a magnetite represented by the formula:
wherein y is greater than 0 and not more than 1, are useful as the magnetic material for magnetic recording media.

公开(公告)号：EP0119302A3

公开(公告)日：1986-11-12

申请号：EP83111409

申请日：1983-11-15

Applicant: International Business Machines Corporation

Inventor： Bradshaw, Richard Lionel ,  Falcone, Samuel John ,  Simonetti, Alexander

IPC: G11B05/70 ,  G11B05/84

CPC classification number: G11B5/70636 ,  Y10S428/90

Abstract: A stable, non-agglomerating, magnetic recording coating ink, for use in coating a flexible nonmagnetic substrate, is made by a two-step process which first mixes finely divided chromium dioxide particles with water and a polymeric surfactant/dispersant agent which has as its major functionality in a side chain, carboxylic acid, as a free acid, ester or amide thereof, and of a relatively low number average molecular weight in the range 500 to 20.000. Only after the particles are dispersed in this slurry is water-based polyurethane binder added to the slurry, as the second step in the process, to form the final ink.

公开(公告)号：EP0130063A3

公开(公告)日：1986-10-01

申请号：EP84304232

申请日：1984-06-22

Applicant: FUJITSU LIMITED

Inventor： Sakai, Yusaku ,  Kitamoto, Yoshito ,  Ohtaki, Shinji ,  Tamaki, Yasushi ,  Nagai, Hikaru

IPC: G11B05/70

CPC classification number: G11B5/725 ,  Y10S428/90 ,  Y10T428/24612 ,  Y10T428/24669

Abstract: A magnetic recording medium includes a substrate (1) having formed thereon, in sequence, a magnetic recording layer (3), a protective coating (4), and a lubricant coating. The protective coating comprises a substantially flat surface (10) having a plurality both of fine projections (12) and fine recesses (11) formed therein. Such a magnetic recording medium can have an excellent resistance to wear and CSS strength and show a satisfatory lubricant retention. Various preferred processes for producing such a medium are disclosed.

Abstract translation: 一种磁记录介质包括其上形成有磁记录层（3），保护涂层（4）和润滑剂涂层的基板（1）。 保护涂层包括基本上平坦的表面（10），其具有多个形成在其中的微细凸起（12）和微小凹陷（11）。 这种磁记录介质可以具有优异的抗磨损性和CSS强度并且显示出满意的润滑剂保持力。 公开了制造这种介质的各种优选方法。

公开(公告)号：EP0129721A3

公开(公告)日：1986-09-10

申请号：EP84105933

申请日：1984-05-25

Applicant: International Business Machines Corporation

Inventor： Ko, Ming ,  Oxsen, Michael Eugene ,  Prime, Robert Bruce

IPC: G11B05/70 ,  G11B05/84 ,  G11B05/72

CPC classification number: G11B5/842 ,  G11B5/7028 ,  G11B5/72 ,  Y10S428/90 ,  Y10T428/249978 ,  Y10T428/24998 ,  Y10T428/249986 ,  Y10T428/31609 ,  Y10T428/31931 ,  Y10T428/31935

Abstract: @ A method is described of fabricating a magnetic recording element comprising applying a layer of a flowable magnetic material to a substrate, said material comprising magnetic particles dispersed in a curable binder; curing the magnetic material of the applied layer; and thereafter applying a lubricant to the surface of the magnetic layer; said method being characterised by the step of addding a thermally degradable additive to the flowable magnetic material, said additive being degraded during curing of the material and producing a plurality of microvoids in the surface of the layer capable of enhancing retention of the lubricant on said surface. More succinctly there is described a heat curable magnetic coating mixture contains one or more polymeric additives selected to thermally oxidize during coating cure to create a plurality of microvoids in the cured coating as an aid to increase the retention of a lubricant which is applied to the cured coating.

公开(公告)号：EP0114340A3

公开(公告)日：1986-07-02

申请号：EP83112807

申请日：1983-12-20

Applicant: BASF Aktiengesellschaft

Inventor： Kohl, Albert ,  Balz, Werner, Dr. ,  Melzer, Milena ,  Schneider, Norbert ,  Koester, Eberhard, Dr. ,  Lehner, August

IPC: G11B05/70

CPC classification number: G11B5/7013 ,  G11B5/7022 ,  G11B5/7023 ,  G11B5/7028