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公开(公告)号：JPH1145425A
公开(公告)日：1999-02-16
申请号：JP14311798
申请日：1998-05-25
Applicant: EMTEC MAGNETICS GMBH
Inventor： HEILMANN PETER DR , ILMER ANDREAS DR , JAKUSCH HELMUT DR , LENZ WERNER DR , MUNCH MICHEL DR , NICKOLAY GERD , SCHNEIDER NORBERT
Abstract: PROBLEM TO BE SOLVED: To provide a magnetic recording material improved in the surface shape, having a good traveling property, particularly an improved output level, a low modulation noise and a less fluctuation in the output level during traveling of a tape. SOLUTION: This recording material consists of a nonmagnetic substrate and more than one different layer provided on this substrate and at least one layer among these different layers is a magnetic layer suitable for storing information. In this case, when the recording material 3 is mounted on a reference surface 2 while a surface 3' opposite to an information recording head imparts the tension of about 14-200 mN to the recording material 3, the recording material 3 has such a surface shape that 50% of the surface 3' is separated from the reference surface 2 by
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公开(公告)号：JPH10283627A
公开(公告)日：1998-10-23
申请号：JP34302797
申请日：1997-12-12
Applicant: EMTEC MAGNETICS GMBH
Inventor： KRESS RIA DR , KOHL ALBERT , LEHNER AUGUST , LENZ WERNER DR , HITZFELD MICHAEL DR
Abstract: PROBLEM TO BE SOLVED: To provide a magnetic recording medium which has excellent wear resistance, high residual induction, a narrow switching field distribution, is substantially free from the defects of layer surfaces and has excellent magnetic characteristics and more particularly the characteristic to preserve digital data. SOLUTION: This magnetic recording medium has a nonmagnetic substrate and a magnetizable layer contg. ferromagnetic powder and a compsn. of a high-polymer material. In such a case, the compsn. of the high-polymer material contains A) an isocyanate reactive polymer obtd. by bringing a polymer into reaction with a multifunctional nonaromatic isocyanate and introducing an ionic or ionogenic group therein and B) a polymer obtd. by bringing a highpolymer diol into reaction with 2 to 18c diol, polyhydric alcohol, diisocyanate and amino alcohol.
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公开(公告)号：DE19651672A1
公开(公告)日：1998-06-18
申请号：DE19651672
申请日：1996-12-12
Applicant: EMTEC MAGNETICS GMBH
Inventor： KRESS RIA DR , KOHL ALBERT , LEHNER AUGUST , LENZ WERNER DR , HITZFELD MICHAEL DR
Abstract: Magnetic recording medium has a non-magnetic substrate and a magnetisable layer containing ferromagnetic pigment and a polymer system, containing 40-100 wt.% polymers (I) and (II), comprising 3-35 wt.% polymer (I) and 5-97 wt.% polymer (II). (I) is obtained by reacting (1) a polymer (III) of (a) 80-100 mole-% 1-25 carbon (C) alkyl or an alpha , beta -unsaturated carboxylic acid, (b) 0-20 mole-% other monomer(s) and (c) a starter and/or regulator giving hydroxyl-(OH) terminated polymer chains, with (2) a non-aromatic polyisocyanate, using 1.2-3.9 mole isocyanate (NCO) groups/mole OH groups in (III); and (3) reacting the product (a) with a compound containing NCO-reactive groups in an amount of 2-7 mole NCO-reactive groups/mole free NCO groups in (III) and (b) then with a compound that reacts with the free reactive groups and introduces ionic or ionogenic groups; or (b) with a compound containing NCO-reactive groups that introduces ionic or ionogenic groups. (II) has a molecular weight of 30 000-2 000 000 and is obtained by reacting (1) 1 mole of a polymeric diol with a number average molecular weight (Mn) of 400-10000 with (2) 0.3-1 mole 2-18 C diol, 0.01-1 mole 3-25 C polyol with NOTLESS 3 OH groups, (4) 1.3-13 mole 6-30 C diisocyanate and (5) 0.09-2 mole 2-16 C amino-alcohol. The ratio of the sum of OH groups in the diols and polyols to NCO groups in the diisocyanate to amino groups in the amino-alcohol is 1:(1.03-1.3):(0.03-0.3).
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公开(公告)号：DE19722137A1
公开(公告)日：1998-12-03
申请号：DE19722137
申请日：1997-05-27
Applicant: EMTEC MAGNETICS GMBH
Inventor： HEILMANN PETER DR , ILMER ANDREAS DR , JAKUSCH HELMUT DR , LENZ WERNER DR , MUNCH MICHEL DR , NICKOLAY GERD , SCHNEIDER NORBERT
Abstract: The magnetic recording material has a non-magnetic substrate. One or several further layers are applied to the substrate. At least one of these further layers is a magnetic layer suitable for storing information. The surface of the recording material nearest to the magnetic head used for recording information has a surface profile formed such that 50% of the surface has a distance of no more than 80 nm from a reference surface (2). 90% of the surface has a distance of no more than 140 nm from the reference surface (2). The recording material (3) lies on the reference surface (2) with its surface under a tension of around 140 to 200 mN. Preferably the density function of the frequency of discrete distance values exhibits a monomodal distribution.
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