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公开(公告)号：JP2001351221A
公开(公告)日：2001-12-21
申请号：JP2001108293
申请日：2001-04-06
Applicant: EMTEC MAGNETICS GMBH
Inventor： JAKUSCH HELMUT DR , KOHL ALBERT , HEILMANN PETER DR , VEITCH RONALD JOHN , KRESS RIA , MUELLER STEFAN , SANDROCK JOHANNES , HEENE HARTMUT
Abstract: PROBLEM TO BE SOLVED: To provide a magnetic recording medium which uses pigment in the lower side layer, which is markedly characterized in that it is every finely pulverized, more economical than the conventional pigment in the lower side layer and magnetically soft. SOLUTION: A multilayered magnetic recording medium, suitable for high recording density and digital recording, having superior electromagnetic recording characteristics and improved surface smoothness and capable of sufficiently absorbing a large quantity of lubricant in the lower side layer, is provided with an upper-side magnetic recording layer, having less than 0.5 μm layer thickness and at least one layer of lower side layer which includes the magnetically soft pigment.
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公开(公告)号：JP2003115105A
公开(公告)日：2003-04-18
申请号：JP2002209345
申请日：2002-07-18
Applicant: EMTEC MAGNETICS GMBH
Inventor： MUELLER STEFAN , SANDROCK JOHANNES , STURM ANDREA , GOEDE WOLFGANG , KOHL ALBERT , RAETHER BENEDIKT
Abstract: PROBLEM TO BE SOLVED: To provide a magnetic recording medium nearly free from friction between the surface of a magnetic layer and a magnetic head. SOLUTION: The magnetic recording medium comprising a substrate, a lower layer and an upper magnetic layer is characterized in that a binder matrix of the upper magnetic layer has at least 50 deg.C glass transition temperature, a binder matrix of the lower layer contains at least one binder having -COO-(R -O)m -R ( wherein, R denotes a hydrocarbon group, R denotes a hydrocarbon group, R denotes an alkylene group and m denotes an integer of 1-4) and at least one compound represented by the formula R -COO-R (wherein R is as defined above and R denotes a hydrocarbon group). The manufacturing method for the magnetic recording medium is also provided.
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公开(公告)号：JP2001357512A
公开(公告)日：2001-12-26
申请号：JP2001108310
申请日：2001-04-06
Applicant: EMTEC MAGNETICS GMBH
Inventor： VEITCH RONALD JOHN , JAKUSCH HELMUT DR , KOHL ALBERT , HEILMANN PETER DR , KRESS RIA , ILMER ANDREAS DR , MUELLER STEFAN , SANDROCK JOHANNES
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
Abstract: PROBLEM TO BE SOLVED: To provide a magnetic recording medium which has excellent electromagnetic characteristics in the entire range of the recording wavelength and excellent mechanical characteristics, is suitable for recording of digital data and can be manufactured by a well-known technique and in which the problem of head saturation is not caused. SOLUTION: In the multi layered magnetic recording medium suitable for high recording density and digital recording, having excellent electromagnetic recording characteristics in the entire range of a recording wavelength, excellent mechanical characteristics, improved surface smoothness and flat frequency response, an upper side magnetic recording layer having
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公开(公告)号：WO03038828A2
公开(公告)日：2003-05-08
申请号：PCT/EP0210973
申请日：2002-10-01
Applicant: EMTEC MAGNETICS GMBH , SCHELBLE JOSEF , TRAUB HANSJOERG , MUELLER STEFAN , SANDROCK JOHANNES
Inventor： SCHELBLE JOSEF , TRAUB HANSJOERG , MUELLER STEFAN , SANDROCK JOHANNES
CPC classification number: G11B5/714 , G11B5/70 , G11B5/7023
Abstract: The invention relates to a magnetic recording medium comprising a) a layer carrier, b) at least one lower non-magnetic layer which is applied to said carrier and comprises at least one binding agent, and c) an upper magnetic layer which is applied to the lower layer, and which, dispersed in at least one binding agent, comprises at least one magnetic metal pigment or metal alloy pigment having a passivating envelope. Said recording medium is characterised in that the upper magnetic layer has a maximum dry thickness of 300 nm; the magnetic metal pigment or metal alloy pigment has a maximum length I of 90 nm; and the length I' of the metal core, the length I of the pigment, and the shortest recording wavelength lambda for the magnetic recording on the medium follow the relation: I'/I#1-18/ lambda . At least the binding agent of the magnetic layer contains both chlorine and epoxy groups, or is free of chloride.
Abstract translation: 本发明涉及包含a）支撑的磁记录介质，b）至少一个施加到其降低包含至少一种粘合剂的非磁性层，以及c）被分散在至少一种粘合剂施加到下层上部磁性层的涂层， 包含具有Passivierungshülle至少一个磁性金属或金属合金颜料，其特征在于，所述上部磁性层具有在300nm以下的干厚度d; 磁性金属或金属合金颜料至多90纳米的总长度I，所述长度I'des金属芯，颜料的总长度l和用于在介质上的磁性记录下列关系服从最短记录波长为λ：I“/ I＃1-18 /λ并且其中至少含有磁性层如氯和环氧基团的粘合剂; 或不含氯化物。
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Patent Agency Ranking
公开(公告)号：DE10153277A1
公开(公告)日：2003-05-08
申请号：DE10153277
申请日：2001-10-29
Applicant: EMTEC MAGNETICS GMBH
Inventor： SCHELBLE JOSEF , TRAUB HANSJOERG , MUELLER STEFAN , SANDROCK JOHANNES
Abstract: The invention relates to a magnetic recording medium comprising a) a layer carrier, b) at least one lower non-magnetic layer which is applied to said carrier and comprises at least one binding agent, and c) an upper magnetic layer which is applied to the lower layer, and which, dispersed in at least one binding agent, comprises at least one magnetic metal pigment or metal alloy pigment having a passivating envelope. Said recording medium is characterised in that the upper magnetic layer has a maximum dry thickness of 300 nm; the magnetic metal pigment or metal alloy pigment has a maximum length I of 90 nm; and the length I' of the metal core, the length I of the pigment, and the shortest recording wavelength lambda for the magnetic recording on the medium follow the relation: I'/I#1-18/ lambda . At least the binding agent of the magnetic layer contains both chlorine and epoxy groups, or is free of chloride.
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公开(公告)号：DE10340214A1
公开(公告)日：2004-10-21
申请号：DE10340214
申请日：2003-09-01
Applicant: EMTEC MAGNETICS GMBH
Inventor： MUELLER STEFAN , HEES ULRIKE
Abstract: A magnetic medium with a film carrier with a lower non-magnetic but polymer binder-containing layer and an upper magnetic layer of a matrix-embedded magnetic pigment is such that the magnetic pigment is embedded at a pigment volume concentration of >=45% in a binder-free oligomer matrix. An independent claim is also included for production of the medium by simultaneously or sequentially applying the lower and upper layers in a wet-wet process, followed by crosslinking, drying and optionally calendering.
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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：DE10135957A1
公开(公告)日：2003-02-13
申请号：DE10135957
申请日：2001-07-24
Applicant: EMTEC MAGNETICS GMBH
Inventor： MUELLER STEFAN , SANDROCK JOHANNES , STURM ANDREA , GOEDE WOLFGANG , KOHL ALBERT , RAETHER BENEDIKT
Abstract: A magnetic recording medium has on a support: (A) a lower layer containing a binder and an inorganic pigment (P1); and (B) an upper layer containing a binder and a magnetic pigment (P2), as well as a non-magnetic pigment (P3). A magnetic recording medium has on a support: (A) a lower layer containing a binder and an inorganic pigment (P1); (B) an upper layer containing a binder and a magnetic pigment (P2); and (C) a non-magnetic pigment (P3). The recording medium is such that: (i) binder (B) has Tg ≥ 50 degrees C and binder (A) a Tg below 50 degrees C; (ii) pigment (P3) has a particle size at least corresponding to the layer (B) dry thickness; and (iii) the layer (B) contains an alkoxylated fatty ester compound of formula R -COO-(R -O)m-R (I) as well as a fatty ester of formula R -COO-R (III): R = optionally unsaturated 11-22C hydrocarbyl group; R = optionally unsaturated 1-6C hydrocarbyl group; R = 1-4C alkylene; m = 1-4; and R = optionally unsaturated 4-8C hydrocarbyl group.
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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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