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公开(公告)号：AT236446T
公开(公告)日：2003-04-15
申请号：AT99941459
申请日：1999-07-24
Applicant: EMTEC MAGNETICS GMBH
Inventor： ILMER ANDREAS , LENZ WERNER , KRESS RIA , HEILMANN PETER , VEITCH RONALD , JAKUSCH HELMUT , HOFFMANN ERICH
Abstract: Digital recording procedures wherein the recording support is not exposed to an obliterating magnetic field before recording are known in recent times. Such recording supports must therefore have good rewrite capability. It has been found that said requirement is fulfilled by two-layered recording supports, wherein the top layer contains a metal or metal alloy powder and has a density of less than 0.3 mu m and wherein the bottom layer contains a magnetic pigment. The coercitive force of the bottom layer has at the most two thirds the coercitive force of the top layer and the remanent magnetization of the bottom layer is at least 32 kA/m.
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公开(公告)号：DE10017490A1
公开(公告)日：2001-10-11
申请号：DE10017490
申请日：2000-04-07
Applicant: EMTEC MAGNETICS GMBH
Inventor： JAKUSCH HELMUT , VEITCH RONALD , KOHL ALBERT , KRESS RIA , SANDROCK JOHANNES , MUELLER STEFAN , HEENE HARTMUT , HEILMANN PETER
IPC: G11B5/667 , G11B5/70 , G11B5/706 , G11B5/708 , G11B5/712 , G11B5/714 , G11B5/716 , G11B5/842 , G11B5/68 , C01G49/02 , B32B15/08
Abstract: Magnetic recording medium comprises an upper magnetic recording layer of thickness of less than 0.5 mu m containing a fine magnetic pigment having a coercive force of 100-250 kA/m on a non-magnetic carrier; and a lower isotropic soft magnetic layer made from psi -Fe2O3, Fe3O4 or a mixed crystal of the two. The average crystal size of the lower layer is less than 10 nm. An Independent claim is also included for a process for the production of a magnetic recording medium. Preferred Features: The magnetic pigment in the upper layer is a metal pigment or a metal alloy pigment, preferably a hexagonal ferrite pigment or a Co-modified psi -Al2O3, Co-modified Fe3O4 or a mixed crystal of these. The soft magnetic pigment in the lower layer is made from an aluminum compound and/or a silicon compound.
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公开(公告)号：BR9913471A
公开(公告)日：2001-06-05
申请号：BR9913471
申请日：1999-07-24
Applicant: EMTEC MAGNETICS GMBH
Inventor： ILMER ANDREAS , LENZ WERNER , KRESS RIA , HEILMANN PETER , JAKUSCH HELMUT , HOFFMANN ERICH , VEITCH RONALD
Abstract: Digital recording procedures wherein the recording support is not exposed to an obliterating magnetic field before recording are known in recent times. Such recording supports must therefore have good rewrite capability. It has been found that said requirement is fulfilled by two-layered recording supports, wherein the top layer contains a metal or metal alloy powder and has a density of less than 0.3 mu m and wherein the bottom layer contains a magnetic pigment. The coercitive force of the bottom layer has at the most two thirds the coercitive force of the top layer and the remanent magnetization of the bottom layer is at least 32 kA/m.
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公开(公告)号：BR9607762A
公开(公告)日：1999-11-30
申请号：BR9607762
申请日：1996-03-18
Applicant: EMTEC MAGNETICS GMBH
Inventor： LEHNER AUGUST , JAKUSCH HELMUT , KOCH VOLKER , OHLINGER MANFRED , KOHL ALBERT , LENZ WERNER , SCHNEIDER NORBERT , HEILMANN PETER , VEITCH RONALD JOHN , HOFFMANN ERICH , BNER WERNER H , JACHOW HARALD , LEHNERT RUDI
IPC: B32B27/20 , B32B33/00 , C01G37/02 , G11B5/708 , G11B5/73 , G11B5/733 , G11B5/738 , G11B5/78 , G11B5/704
Abstract: Tape-like magnetic recording media having a nonmagnetic substrate and at least one layer applied to the substrate having incorporated into at least one of these layers, an inorganic needle-shaped pigment which serves as a supporting pigment and has a ratio of the average length to the average diameter of the pigment of at least 3, and the mean modulus of elasticity of the layers is not less than 15 Gpa in the longitudinal direction of the tape-like recording media.
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公开(公告)号：DE59604372D1
公开(公告)日：2000-03-09
申请号：DE59604372
申请日：1996-03-18
Applicant: EMTEC MAGNETICS GMBH
Inventor： LEHNER AUGUST , JAKUSCH HELMUT , KOCH VOLKER , OHLINGER MANFRED , KOHL ALBERT , LENZ WERNER , SCHNEIDER NORBERT , HEILMANN PETER , VEITCH JOHN , HOFFMANN ERICH , HUEBNER WERNER , JACHOW HARALD , LEHNERT RUDI
Abstract: Tape-like magnetic recording media having a nonmagnetic substrate and at least one layer applied to the substrate having incorporated into at least one of these layers, an inorganic needle-shaped pigment which serves as a supporting pigment and has a ratio of the average length to the average diameter of the pigment of at least 3, and the mean modulus of elasticity of the layers is not less than 15 Gpa in the longitudinal direction of the tape-like recording media.
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Patent Agency Ranking
公开(公告)号：EA000248B1
公开(公告)日：1999-02-25
申请号：EA199700217
申请日：1996-03-18
Applicant: EMTEC MAGNETICS GMBH
Inventor： LEHNER AUGUST , JAKUSCH HELMUT , KOCH VOLKER , OHLINGER MANFRED , KOHL ALBERT , LENZ WERNER , SCHNEIDER NORBERT , HEILMANN PETER , VEITCH RONALD JOHN , HOFFMANN ERICH , HUEBNER WERNER , JACHOW HARALD , LEHNERT RUDI
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公开(公告)号：CA2215259A1
公开(公告)日：1996-10-03
申请号：CA2215259
申请日：1996-03-18
Applicant: EMTEC MAGNETICS GMBH
Inventor： HOFFMANN ERICH , HEILMANN PETER , SCHNEIDER NORBERT , LENZ WERNER , JACHOW HARALD , LEHNERT RUDI , OHLINGER MANFRED , JAKUSCH HELMUT , VEITCH RONALD JOHN , KOHL ALBERT , LEHNER AUGUST , KOCH VOLKER , HUEBNER WERNER
IPC: B32B27/20 , B32B33/00 , C01G37/02 , G11B5/708 , G11B5/73 , G11B5/733 , G11B5/738 , G11B5/78 , G11B5/704
Abstract: Described are tape-type magnetic recording media (I) including a non-magnetic substrate (III), at least one film applied to the substrate and, in at least one of these films, an inorganic acicular pigment (II) suitable for use as a supporting pigment, the ratio of the mean length to the mean diameter of the pigment (II) being at least 3 and the mean modulus of elasticity of the films being not less than 15 GPa in the longitudinal direction of the tape-type recording medium (I).
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公开(公告)号：DE59904894D1
公开(公告)日：2003-05-08
申请号：DE59904894
申请日：1999-07-24
Applicant: EMTEC MAGNETICS GMBH
Inventor： ILMER ANDREAS , LENZ WERNER , KRESS RIA , HEILMANN PETER , VEITCH RONALD , JAKUSCH HELMUT , HOFFMANN ERICH
Abstract: Digital recording procedures wherein the recording support is not exposed to an obliterating magnetic field before recording are known in recent times. Such recording supports must therefore have good rewrite capability. It has been found that said requirement is fulfilled by two-layered recording supports, wherein the top layer contains a metal or metal alloy powder and has a density of less than 0.3 mu m and wherein the bottom layer contains a magnetic pigment. The coercitive force of the bottom layer has at the most two thirds the coercitive force of the top layer and the remanent magnetization of the bottom layer is at least 32 kA/m.
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公开(公告)号：DE10017489A1
公开(公告)日：2001-10-11
申请号：DE10017489
申请日：2000-04-07
Applicant: EMTEC MAGNETICS GMBH
Inventor： VEITCH RONALD , JAKUSCH HELMUT , KOHL ALBERT , KRESS RIA , SANDROCK JOHANNES , MUELLER STEFAN , ILMER ANDREAS , HEILMANN PETER
IPC: B42D15/10 , G11B5/62 , G11B5/70 , G11B5/706 , G11B5/708 , G11B5/712 , G11B5/714 , G11B5/716 , G11B5/842 , G11B5/845 , G11B5/852 , H01F1/34 , G11B5/68 , C01G49/02 , B32B15/08
Abstract: Magnetic recording medium comprises an upper magnetic recording layer of thickness of less than 0.5 mu m containing a fine magnetic pigment having a coercive force of 80-250 kA/m on a non-magnetic carrier; and a lower isotropic soft magnetic layer made from \=g-Fe2O3, Fe3O4 or a mixed crystal of the two. The coercive force of the lower layer is less than 4 kA/m and the non-hysteresis susceptibility of the lower layer at 2 kA/m is more than 7. An Independent claim is also included for a process for the production of a magnetic recording medium. Preferred Features: The magnetic pigment in the upper layer is a metal pigment or a metal alloy pigment, preferably a hexagonal ferrite pigment or a Co-modified \=g-Al2O3, Co-modified Fe3O4 or a mixed crystal of these. The soft magnetic pigment in the lower layer is made from an aluminum compound and/or a silicon compound.
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公开(公告)号：NO974467A
公开(公告)日：1997-11-26
申请号：NO974467
申请日：1997-09-26
Applicant: EMTEC MAGNETICS GMBH
Inventor： LEHNER AUGUST , JAKUSCH HELMUT , KOCH VOLKER , OHLINGER MANFRED , KOHL ALBERT , LENZ WERNER , SCHNEIDER NORBERT , HEILMANN PETER , VEITCH JOHN RONALD , HOFFMANN ERICH , HUEBNER WERNER , JACHOW HARALD , LEHNERT RUDI
IPC: B32B27/20 , B32B33/00 , C01G37/02 , G11B5/708 , G11B5/73 , G11B5/733 , G11B5/738 , G11B5/78 , G11B5/704
CPC classification number: G11B5/708 , G11B5/733 , G11B5/738 , Y10S428/90 , Y10T428/256 , Y10T428/257
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