公开(公告)号：EP0101020A3

公开(公告)日：1986-03-12

申请号：EP83107686

申请日：1983-08-04

Applicant: BASF Aktiengesellschaft

Inventor： Roller, Hermann ,  Balz, Werner, Dr. ,  Baur, Reinhold ,  Sommermann, Friedrich, Dr. ,  Gutermann, Winfried

IPC: G11B05/70

CPC classification number: G11B5/7022 ,  G11B5/7305

公开(公告)号：EP0077549A3

公开(公告)日：1985-06-05

申请号：EP82109567

申请日：1982-10-15

Applicant: Matsushita Electric Industrial Co., Ltd.

Inventor： Suzuki, Takashi ,  Fujimori, Hiroshi ,  Odagiri, Masaru

IPC: G11B05/62 ,  G11B05/70 ,  G11B05/84 ,  H01F10/26

CPC classification number: G11B5/62 ,  G11B5/7305 ,  G11B5/84 ,  Y10S428/90 ,  Y10T428/24612 ,  Y10T428/25

Abstract: A magnetic recording medium in which a thin ferromagnetic film is formed over a strip or sheet of plastic film whose surface is formed with grain-, rumple- or worm-like nodules into which may be dispersed finely divided particles of the diameter ranging from 0.01 to 0.2 µm. In the case of a thin ferromagnetic metal film type recording medium, steep protrusions of the height ranging from 100 to 2,000 A are distributed over the surface at the average density of 10 4 to 106 per m m 2 .

公开(公告)号：EP0075869A3

公开(公告)日：1984-10-10

申请号：EP82108807

申请日：1982-09-23

Applicant: Hitachi Maxell Ltd.

Inventor： Togawa, Fumio ,  Aoyama, Shigeo Kyokuei Build. Room No. 202

IPC: G11B05/70 ,  H01F01/11

CPC classification number: G11B5/845 ,  G11B5/706 ,  G11B5/70673 ,  Y10S428/90 ,  Y10T428/256 ,  Y10T428/257 ,  Y10T428/2991 ,  Y10T428/31678

Abstract: A magnetic recording medium suitable for high-density recording, which comprises a magnetic layer containing uniaxial anisotropic, acicular iron oxide particles having a particle size of not more than 0.3 p wherein a surface layer containing major amount of cobalt is formed on seeds of said magnetic particles, said magnetic recording medium having not less than 1000 gauss of a redisual magnetic flux density both in a vertical direction and in a horizontal direction.

公开(公告)号：EP0044258A3

公开(公告)日：1982-01-27

申请号：EP81401126

申请日：1981-07-15

Applicant: EASTMAN KODAK COMPANY (a New Jersey corporation)

Inventor： Pingaud, Bernard Jean ,  Poncet, Claude

IPC: G11B05/70 ,  G11B05/84 ,  H01F01/11

CPC classification number: G11B5/714 ,  G11B5/70 ,  G11B5/70652 ,  G11B5/70668 ,  G11B5/842

Abstract: Magnetic recording elements having at least one magnetic recording layer containing acicular magnetic parti cles that have magnetocrystalline anisotropy, shape anisotropy which provides a preferred axis of magnetization and coercivities of at least 450 Oersteds. These particles are dispersed in a binder and form a distribution that imparts an isotropic magnetic response to the magnetic recording layer. A process for preparing the above magnetic recording elements is also disclosed. According to this process, the aforementioned magnetic particles are dispersed in a liquid medium. The dispersion is formed into a magnetic recording layer while establishing a distribution of particles that has spherically symmetrical magnetic properties (symmetry that is three-dimensional). The layer is then solidified while maintaining this distribution. A magnetic recording method is also disclosed. This method involves (1) providing a signal modulated magnetic field by means of a gapped magnetic ring head, (2) subjecting to that field a magnetic recording layer of the type previously described and (3) causing relative motion between the head and the layer.

公开(公告)号：EP0024694A3

公开(公告)日：1981-08-26

申请号：EP80104979

申请日：1980-08-21

Applicant: BASF Aktiengesellschaft

Inventor： Steck, Werner, Dr. ,  Sarnecki, Wilhelm, Dr. ,  Marosi, Laszlo, Dr. ,  Ohlinger, Manfred,Dr. ,  Loeser, Werner, Dr.

IPC: H01F01/06 ,  B22F09/22 ,  G11B05/70

CPC classification number: H01F1/065 ,  B22F9/22 ,  H01F1/061

公开(公告)号：EP0219765A3

公开(公告)日：1988-07-06

申请号：EP86113937

申请日：1986-10-08

Applicant: Agfa-Gevaert AG

Inventor： Brinkmeyer, Hermann, Dr. ,  Hübler, Gerhard, Dr. ,  Perrey, Hermann, Dr. ,  Nippe, Burkhard, Dr. ,  Kober, Heinrich, Dr.

IPC: G11B05/70 ,  G11B05/702

CPC classification number: G11B5/7013 ,  G11B5/7026 ,  Y10S428/90 ,  Y10T428/31609 ,  Y10T428/3179 ,  Y10T428/31935

公开(公告)号：EP0195216A3

公开(公告)日：1987-09-30

申请号：EP86101469

申请日：1986-02-05

Applicant: International Business Machines Corporation

Inventor： Piltingsrud, Douglas Howard ,  Shen, John Chen Shyan

IPC: G11B05/70

CPC classification number: G11B5/7013

Abstract: This invention relates to the preparation of the magnetic particle dispersants for improving the high density magnetic recording binder system. The dispersants are prepared by reacting an organophosphate ester or a carboxylated polyester compound with a liquid low molecular weight bisphenol-A epoxy, under a well defined condition to convert the unreacted acid groups to epoxy ester groups. Using this end-product as a dispersion aid in the magnetic coating formulation enhances the loading and dispersibility of the magnetic particles. This dispersant additive also improves the polymer-particle compatibility which further enhances the ink stability and processability for thinner disk coating.

公开(公告)号：EP0175339A3

公开(公告)日：1987-09-30

申请号：EP85111727

申请日：1985-09-17

Applicant: Hitachi Maxell Ltd.

Inventor： Sakemoto, Akito ,  Fujiwara, Hideo ,  Mizushima, Kunio ,  Miyake, Akira c/o Hitachi Maxell Ltd.

IPC: G11B05/70

CPC classification number: G11B5/70673 ,  G11B5/012 ,  G11B5/1276 ,  G11B5/70 ,  G11B5/70615 ,  G11B5/714 ,  Y10S428/90 ,  Y10T428/25 ,  Y10T428/265

Abstract: @ A magnetic recording medium suitable for high density recording comprising a non-magnetic substrate and a magnetic layer which contains a non-magnetic binder and ferromagnetic powder dispersed therein and is formed on said substrate, coercive force of said magnetic layer being 1,400 to 2,000 oersteds, residual magnetic flux density being at least 1,100 gausses and a thickness of said layer being at least 0.5 µm, which effectively works when it is used together with a magnetic head a part of which near a megnetic gap is made of a magnetic material having saturation magnetic flux density of at least 7,000 gausses and which has a magnetic gap length of 0.15 to 0.4 µm.

公开(公告)号：EP0172520A3

公开(公告)日：1987-03-25

申请号：EP85110095

申请日：1985-08-12

Applicant: BASF Aktiengesellschaft

Inventor： Huebner, Werner ,  Melzer, Milena ,  Koester, Eberhard, Dr. ,  Baur, Reinhold, Dr. ,  Sommermann, Friedrich, Dr.

IPC: G11B05/70

CPC classification number: G11B5/84 ,  G11B5/7013 ,  G11B5/702

Abstract: Die Erfindung betrifft ein Verfahren zur Herstellung von magnetischen Aufzeichnungsträgern durch Dispergieren von pulverförmigem magnetischem Material mit Hilfe einer üblichen Dispergiereinrichtung in einem Gemisch aus orga nischem Lösungsmittel, organischem Polymerbindemittel, Dispergierhilfsmittel und weiteren üblichen Zusatzstoffen, schichtförmiges Auftragen der resultierenden Dispersion auf ein Trägermaterial und anschließendes Verfestigen der Schicht.

公开(公告)号：EP0087503A3

公开(公告)日：1985-07-31

申请号：EP82110212

申请日：1982-11-05

Applicant: International Business Machines Corporation

Inventor： Ko, Ming

IPC: G11B05/70

CPC classification number: C08G18/6216 ,  G11B5/7021 ,  Y10S428/90 ,  Y10T428/31609

Abstract: This invention relates to a magnetic recording composition comprising magnetic particles dispersed in a binder. The binder is a blocked polyurethane binder including blocked isocyanates or blocked polyisocyanates with polyacrylates which contain reactive hydrogens.