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    14.
    发明专利
    未知

    公开(公告)号：DE59803043D1

    公开(公告)日：2002-03-21

    申请号：DE59803043

    申请日：1998-12-16

    Applicant: EMTEC MAGNETICS GMBH

    Inventor： LEHNER AUGUST ,  KOHL ALBERT ,  KRESS RIA ,  WUENSCH THOMAS ,  WEINGART FRANZ

    IPC: C09D5/23 ,  C09D175/04 ,  G11B5/702

    Abstract: The present invention relates to a magnetic recording medium, comprising a non-magnetic support and at least one magnetic coating applied thereto, whereby said coating contains at least one finely distributed magnetic material dispersed in a binding agent. Said binding agent contains at least one polyurethane resin (PV, which can be obtained by cross-linking at least one polyisocyanate (A) with at least one polyurethane prepolymer (B) which is free of isocyanate groups and contains at least 3 active hydrogen atoms. The invention is characterised in that the polyurethane prepolymer (B) has at least two hydroxyl groups and at least one primary and/or secondary amino group. The invention also relates to a method for producing a magnetic recording medium, polyurethane prepolymers B) which are free of isocyanate and a method for the production and use thereof.

    16.
    发明专利
    未知

    公开(公告)号：DE59505753D1

    公开(公告)日：1999-06-02

    申请号：DE59505753

    申请日：1995-06-30

    Applicant: EMTEC MAGNETICS GMBH

    Inventor： LEHNER AUGUST ,  KRESS RIA DR ,  KOHL ALBERT ,  HITZFELD MICHAEL DR

    IPC: C09D5/23 ,  C09D175/00 ,  C09D175/04 ,  C09D175/14 ,  C09D175/16 ,  G11B5/702

    Abstract: Magnetic recording medium has a non-magnetic substrate and magnetisable layer(s) based on magnetic pigments dispersed in a binder mixt., which comprises (a) a mixt. of 3-35% polyurethane-urea (meth)acrylate (I) and 5-97% polyurea-urethane (II) contg. anionic gps.; or (b) a mixt. of 5-25% (I), 15-60% (II) and 15-60% polymeric binder without anionic gps., selected from polyurethane, PVC, polyvinylformal, phenoxy resin, nitrocellulose and/or cellulose ester.

    17.
    发明专利
    未知

    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

    IPC: C09D5/23 ,  G11B5/702 ,  B32B15/08

    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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