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    MAGNETIC RECORDING MEDIUM
    1.
    发明专利
    MAGNETIC RECORDING MEDIUM 失效

    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

    IPC: C09D5/23 ,  G11B5/702

    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.

    Magnetic recording media
    6.
    发明专利
    Magnetic recording media 未知

    公开(公告)号：GB2282338B

    公开(公告)日：1997-08-20

    申请号：GB9419183

    申请日：1994-09-22

    Applicant: BASF MAGNETICS GMBH ,  EMTEC MAGNETICS GMBH

    Inventor： BRODT GREGOR ,  VASS ATTILA ,  LOCH WERNER ,  LEHNER AUGUST ,  LENZ WERNER ,  SCHNEIDER NORBERT

    IPC: C08G18/10 ,  C08G18/62 ,  C08G18/78 ,  C09D5/23 ,  C09D175/00 ,  C09D175/04 ,  G11B5/702 ,  C08L75/04

    Abstract: In magnetic recording media consisting of a nonmagnetic substrate and at least one magnetizable layer firmly applied thereon and based on magnetic material dispersed in a binder mixture which contains at least one hydroxyl-containing, preferably low molecular weight polyureaurethane and one polyurethaneurea (meth)acrylate, the polyurethaneurea (meth)acrylate is obtained by reacting a poly(meth)acrylate having up to 2 terminal OH groups per mol and a molecular weight of from 200 to 50,000 with a mixture of aliphatic polyisocyanates having an average functionality of from 3.0 to 6.0 NCO groups per mol, consisting of from 0.1 to 10% by weight of a diisocyanate, from 30 to 80% by weight of a triisocyanate and from 20 to 60% by weight of an isocyanate having a functionality of from 4 to 10, with the proviso that from 1.2 to 3.0 NCO groups react per OH group and the remaining NCO groups are converted into substituted terminal urea groups with a polyfunctional amine or with a mixture of different polyfunctional amines.

    8.
    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.

    10.
    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.

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