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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：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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Patent Agency Ranking
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：AU756079B2
公开(公告)日：2003-01-02
申请号：AU5506899
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：AU5506899A
公开(公告)日：2000-03-21
申请号：AU5506899
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：DE19838799A1
公开(公告)日：2000-03-02
申请号：DE19838799
申请日：1998-08-26
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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