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    13.
    发明专利
    未知

    公开(公告)号：FR2714909A1

    公开(公告)日：1995-07-13

    申请号：FR9500186

    申请日：1995-01-10

    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 ,  C08G18/32

    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.

    Magnetic recording media
    15.
    发明专利
    Magnetic recording media 未知

    公开(公告)号：DE4433931A1

    公开(公告)日：1995-04-06

    申请号：DE4433931

    申请日：1994-09-23

    Applicant: BASF MAGNETICS GMBH

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

    IPC: C08G18/10 ,  C08G18/62 ,  C08G18/78 ,  C09D5/23 ,  C09D175/00 ,  C09D175/04 ,  G11B5/702 ,  C08G18/83

    Abstract: The invention concerns magnetic recording media consisting of a nonmagnetic base material and, firmly adherent thereto, at least one magnetisable layer based on a magnetic material dispersed in a binder mixture which contains at least one hydroxyl-containing, preferably low molecular weight polyurea urethane and a polyurethane urea (meth)acrylate, characterised in that the polyurethane urea (meth)acrylate is obtained by reacting a poly(meth)acrylate having up to 2 OH end groups per mole and a molecular weight between 200 and 50000 with a mixture of aliphatic polyisocyanates having an average functionality of 3.0 to 6.0 NCO groups per mole and consisting of 0.1 to 10% by weight of a diisocyanate, 30 to 80% by weight of a triisocyanate, and 20 to 60% by weight of an isocyanate having a functionality of 4 to 10, with the proviso that 1.2 to 3.0 NCO groups are reacted per OH group and the remaining NCO groups are converted with polyfunctional amines or a mixture of various polyfunctional amines in substituted urea end groups.

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