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公开(公告)号：JP2001151845A
公开(公告)日：2001-06-05
申请号：JP2000287074
申请日：2000-09-21
Applicant: EMTEC MAGNETICS GMBH
Inventor： RAETHER BENEDIKT , HEES ULRIKE , KRESS RIA , KOHL ALBERT , BRADSHAW RICHARD
Abstract: PROBLEM TO BE SOLVED: To provide a polymer which gives proper hardness and abrasion durability to magnetic recording media and further gives sufficient recording stability on storage or operation under high temperature, when used for the production of the magnetic recording media. SOLUTION: This thermoplastic block copolymer polyurethane having at least one soft segment A and at least one hard segment B, characterized in that at least one hard segment in the polyurethane has at least one anchor group. Further, the method for producing the polyurethane, the binder produced from the polyurethane, and the molded article are also provided. The method for using the polyurethane to produce the magnetic recording medium is also provided.
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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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3.发明专利
公开(公告)号：JPH11166031A
公开(公告)日：1999-06-22
申请号：JP22834598
申请日：1998-08-12
Applicant: EMTEC MAGNETICS GMBH
Inventor： WEINGART FRANZ , HACKL CHRISTA , KRECH RUEDIGER , BAUER STEPHAN , KOHL ALBERT , KRESS RIA , SCHELBLE JOSEF , BOHRMANN HANS-GUENTHER
Abstract: PROBLEM TO BE SOLVED: To obtain a thermoplastic polyurethane containing no isocyanate group, useful as a binder having improved dispersion characteristics for a mag netic recording medium having excellent magnetic characteristics, by subjecting a specific constituent component to melt polymerization and specifying a molecu lar weight, etc. SOLUTION: Constituent components comprising (A) a 1 mol of a polyol having 400-4,000 molecular weigh, (B) 0.3-9 mol of a mixture of (i) optionally a 2-18C diol and (ii) 0.03-0.4 mol of a diol containing one or more acidic groups, (C) 0-1 mol of a 3-18C polyol containing three or more OH groups, (D) 1.25-13 mols of a 6-30C diisocyanate and (E) 0-1 mol of a 2-16C primary or secondary amino-alcohol are subjected to melt polymerization so as to make the molar ratio of OH group and NH group in the components A, B, C and E to NCO group in the component D of 0.98-1.4 to give the objective polyurethane containing an acidic group, soluble in tetrahydrofuran and having 15,000-70,000 molecular weight.
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公开(公告)号：JP2001335687A
公开(公告)日：2001-12-04
申请号：JP2001032276
申请日：2001-02-08
Applicant: EMTEC MAGNETICS GMBH
Inventor： HEES ULRIKE , RAETHER BENEDIKT , KOHL ALBERT , KRESS RIA , BLUM RAINER
IPC: G11B5/706 , C08G18/08 , C08G18/12 , C08G18/32 , C08G18/38 , C08G18/40 , C08L75/04 , C09D5/23 , C09D175/04 , G11B5/702 , G11B5/842
Abstract: PROBLEM TO BE SOLVED: To provide a binder composition for magnetic recording media having excellent dispersibility, being as anhydrous as possible, and easy to control the physical properties of the recording media by a specific chemical modification, and to provide such a magnetic recording medium itself. SOLUTION: This binder composition comprises polyurethane and at least one magnetic pigment or magnetizable pigment, where the polyurethane has a structural unit expressed by formula (I) Or, its partial salt or its perfect salt.
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公开(公告)号：JP2001316619A
公开(公告)日：2001-11-16
申请号：JP2001032259
申请日：2001-02-08
Applicant: EMTEC MAGNETICS GMBH
Inventor： HEES ULRIKE , RAETHER BENEDIKT , KOHL ALBERT , KRESS RIA , BLUM RAINER
IPC: C08K3/00 , C08G18/08 , C08G18/12 , C08G18/38 , C08G18/65 , C08L75/04 , C09D5/23 , C09D175/04 , G11B5/702 , G11B5/842
Abstract: PROBLEM TO BE SOLVED: To provide a binder composition for a magnetic recording medium which is easily produced, has an excellent dispersibility, is anhydrous as highly as possible, and can easily control the physical characteristics of a recording medium by a specific chemical modification and to provide a magnetic recording medium using the same. SOLUTION: This binder composition contains a polyurethane and at least one magnetic or magnetizable pigment provided the polyurethane has structural units represented by formula I.
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Patent Agency Ranking
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：JP2001192612A
公开(公告)日：2001-07-17
申请号：JP2000287112
申请日：2000-09-21
Applicant: EMTEC MAGNETICS GMBH
Inventor： RAETHER BENEDIKT , HEES ULRIKE , KRESS RIA , KOHL ALBERT , BRADSHAW RICHARD , GERHARD MEYER
IPC: C08L75/04 , C08G18/78 , C09D175/04 , C09J175/04 , G11B5/702
Abstract: PROBLEM TO BE SOLVED: To provide a binder-contg. composition capable of giving magnetic recording media having such sufficient hardness and wear resistance as to be preservable and operable even at high temperatures and high humidities, thus favorably usable for producing magnetic recording media. SOLUTION: This binder-contg. composition comprises at least one thermoplastic blocked copolyurethane having at least one soft segment A and at least one hard segment B and at least one kind of inorganic filler; wherein the thermoplastic blocked copolyurethane is such that the at least one hard segment B has a structural moiety shown by the formula I. This binder-contg. composition can be used for producing, in particular magnetic recording media.
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公开(公告)号：DE10105144A1
公开(公告)日：2001-08-23
申请号：DE10105144
申请日：2001-02-06
Applicant: EMTEC MAGNETICS GMBH
Inventor： HEES ULRICKE , RAETHER BENEDIKT , KRESS RIA , KOHL ALBERT , BLUM RAINER
IPC: C08K3/00 , C08G18/08 , C08G18/12 , C08G18/38 , C08G18/65 , C08L75/04 , C09D5/23 , C09D175/04 , G11B5/702 , G11B5/842 , C08G18/63 , C08K7/16 , C09D5/14
Abstract: Binder composition contains a polyurethane with a 2-(aminoacylamido)-alkanesulfonic acid unit (I) or its salt and magnetic or magnetizable pigment(s). Binder composition contains a polyurethane with a 2-(aminoacylamido)-alkanesulfonic acid unit of formula (I) or its salt and magnetic or magnetizable pigment(s): [Image] R1>hydrogen (H) or a 1-20 carbon (C) linear or branched, (un)saturated aliphatic, 4-20 C (un)saturated, (un)substituted cycloaliphatic, or 6-40 C (un)substituted aromatic hydrocarbyl group; R2>a 1-20 C linear or branched (un)saturated aliphatic or 4-20 C cycloaliphatic or 6-18 C (un)substituted aromatic hydrocarbyl group; X1>, X2>an (un)substituted group with not less than 2 C atoms, at least one of which is attached to the polyurethane by reaction with a hydroxyl (OH), amino (NH2), substituted amino NHR3>) or thiol (SH) group; R3>a 1-44 C linear or branched, (un)saturated alkyl group, optionally with aromatic substituent(s) . Independent claims are also included for (a) the production of the binder composition by mixing the polyurethane binder with magnetic or magnetizable pigment(s); and (b) magnetic recording media containing this composition.
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公开(公告)号：DE10005647A1
公开(公告)日：2001-08-16
申请号：DE10005647
申请日：2000-02-09
Applicant: EMTEC MAGNETICS GMBH
Inventor： HEES ULRIKE , BLUM RAINER , RAETHER BENEDIKT , KRESS RIA , KOHL ALBERT
IPC: G11B5/706 , C08G18/08 , C08G18/12 , C08G18/32 , C08G18/38 , C08G18/40 , C08L75/04 , C09D5/23 , C09D175/04 , G11B5/702 , G11B5/842 , C08K3/10
Abstract: A binder composition for a magnetic recording medium comprises at least one polyurethane having a structural unit according to the formula I or a partial or full salt thereof, and a magnetic or magnetizable pigment.
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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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