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    Magnetic recording media
    1.
    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.

    Materials suitable as crosslinkable binder components
    3.
    发明专利
    Materials suitable as crosslinkable binder components 未知

    公开(公告)号：GB2285807B

    公开(公告)日：1998-04-29

    申请号：GB9500512

    申请日：1995-01-11

    Applicant: BASF MAGNETICS GMBH ,  EMTEC MAGNETICS GMBH

    Inventor： WUENSCH THOMAS ,  BRODT GREGOR ,  KRESS RIA ,  SCHNEIDER NORBERT ,  KOHL ALBERT ,  LEHNER AUGUST ,  BALZ WERNER

    IPC: C08G18/12 ,  C08G18/61 ,  C08G18/65 ,  C08G18/66 ,  C09D5/23 ,  C09D175/00 ,  C09D175/04 ,  G11B5/702

    Abstract: Preparation of materials (I) having an average molecular weight from 4000 to 30,000, obtainable by reacting 1) a polyurethane (II) comprising a) 1 mol of a diol (III) having an average molecular weight of from 400 to 4000, b) from 0.3 to 9 mol of an aliphatic or cycloaliphatic diol (IV) of 2 to 18 carbon atoms, c) from 0.3 to 9 mol of an aromatic diol (V) of 8 to 30 carbon atoms, d) from 0.01 to 1 mol of a trihydric alcohol (VI) of 3 to 18 carbon atoms, e) from 0.001 to 1 mol of a polyhydric alcohol (VII) of 3 to 14 carbon atoms which contains a tertiary amino group and f) an amount of a diisocyanate (VIII) of 6 to 30 carbon atoms such that the molar ratio of the isocyanate groups to the total number of hydroxyl groups in (III) to (VII) is from 1.05:1 to 1.4:1 with 2) a compound (IX) which contains one or more hydroxyl groups and one or more amino groups reactive toward isocyanate groups, the amount of (IX) being such that the number of reactive amino groups corresponds to the number of isocyanate groups in the polyurethane (II). The materials may be used as crosslinkable binder components for pigment-containing coatings, in particular for the production of magnetic recording materials.

    Materials suitable as crosslinkable binder components
    4.
    发明专利
    Materials suitable as crosslinkable binder components 未知

    公开(公告)号：GB2286192B

    公开(公告)日：1998-04-29

    申请号：GB9500515

    申请日：1995-01-11

    Applicant: BASF MAGNETICS GMBH ,  EMTEC MAGNETICS GMBH

    Inventor： BRODT GREGOR ,  WUENSCH THOMAS ,  LEHNER AUGUST ,  KOHL ALBERT

    IPC: C08G18/12 ,  C08G18/65 ,  C09D5/23 ,  G11B5/702 ,  C08G18/66

    Abstract: A material suitable as crosslinking binder component for pigment-containing coatings and having an average molecular weight of from 25,000 to 150,000, obtainable by reacting a polyurethane comprising a diol having a molecular weight between 400 and 4,000, an aliphatic or cycloaliphatic diol of 2-18 carbon atoms, an aromatic diol of 8-36 carbon atoms, a trihydric or polyhydric alcohol of 3-18 carbon atoms, a polyhydric alcohol of 3-40 carbon atoms containing a tertiary amino group, and a diisocyanate of 3-34 carbon atoms with a compound containing one or more hydroxyl groups and one or more amino groups reactive toward isocyanate groups. The materials may be used as crosslinkable binder components for pigment-containing coatings, in particular for the production of magnetic recording materials.

    MAGNETIC RECORDING MEDIUM
    6.
    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.

    MATERIAL SUITABLE FOR COMPOSITION OF CROSS-LINKABLE BONDING AGENT
    9.
    发明专利
    MATERIAL SUITABLE FOR COMPOSITION OF CROSS-LINKABLE BONDING AGENT 失效

    公开(公告)号：JPH0850717A

    公开(公告)日：1996-02-20

    申请号：JP356695

    申请日：1995-01-12

    Applicant: BASF MAGNETICS GMBH

    Inventor： WUENSCH THOMAS ,  BRODT GREGOR ,  KRESS RIA ,  SCHNEIDER NORBERT ,  KOHL ALBERT ,  LEHNER AUGUST ,  BALZ WERNER

    IPC: C08G18/12 ,  C08G18/61 ,  C08G18/65 ,  C08G18/66 ,  C09D5/23 ,  C09D175/00 ,  C09D175/04 ,  G11B5/702

    Abstract: PURPOSE: To provide a coupling agent having improved mechanical characteristics, such as, limit strength, hardness, wear resistance and elasticity, and exhibiting a high crosslinking speed, by causing the coupling agent to contain polyurethane made of predetermined components and a material having a specified molecular weight. CONSTITUTION: Polyurethane contains 1mol of diol having an average molecular weight of 400-4000, 0.3-9mol of aliphatic compound having 2-18 carbon atoms, 0.3-9mol of aromatic diol having 8-30 carbon atoms, and 0.01-1mol of trivalent alcohol having 3-8 carbon atoms. The polyurethane further contains 0.01-1mol of multivalent alcohol having 3-14 carbon atoms and tertiary amino group, and diisocyanate having 6-30 carbon atoms with a molar ratio of isocyanate group to all hydroxyl groups being 1.05:1-1.4:1. This polyurethane and a predetermined compound are caused to react under specified conditions to provide a material having an average molecular weight of 4000-30000, thereby forming a magnetic recording medium.

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