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    Magnetic recording medium based on a polyurethane prepolymer containing hydroxyland amino groups
    33.
    发明专利
    Magnetic recording medium based on a polyurethane prepolymer containing hydroxyland amino groups 未知

    公开(公告)号：AU2273699A

    公开(公告)日：1999-07-19

    申请号：AU2273699

    申请日：1998-12-16

    Applicant: EMTEC MAGNETICS GMBH

    Inventor： LEHNER AUGUST ,  KOHL ALBERT ,  KRESS RIA ,  WUNSCH 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.

    35.
    发明专利
    未知

    公开(公告)号：FR2714910B1

    公开(公告)日：1997-01-31

    申请号：FR9500187

    申请日：1995-01-10

    Applicant: BASF MAGNETICS GMBH

    Inventor： DR BRODT GREGOR ,  LEHNER AUGUST ,  KOHL ALBERT ,  DR WUNSCH THOMAS

    IPC: C08G18/12 ,  C08G18/65 ,  C09D5/23 ,  G11B5/702 ,  C08G18/32 ,  C09D175/00

    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.

    Materials suitable as crosslinkable binder components
    37.
    发明专利
    Materials suitable as crosslinkable binder components 未知

    公开(公告)号：GB2286192A

    公开(公告)日：1995-08-09

    申请号：GB9500515

    申请日：1995-01-11

    Applicant: BASF 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 (I) suitable as crosslinkable binder component for pigment-containing coatings and having an average molecular weight of from 25,000 to 150,000 is obtainable by reacting (1) a polyurethane (II) comprising a) 1 mol of a diol (III) having an average molecular weight of from 400 to 4,000, b) from 0.1 to 10 mol of an aliphatic or cycloaliphatic diol (IV) of 2 to 18 carbon atoms, c) from 0.01 to 10 mol of an aromatic diol (V) of 8 to 36 carbon atoms, d) from 0.01 to 2 mol of a trihydric or polyhydric alcohol (VI) of 3 to 18 carbon atoms, e) from 0.01 to 8 mol of a polyhydric alcohol (VII) of 3 to 40 carbon atoms which contains a tertiary amino group and f) an amount of a diisocyanate (VIII) of 6 to 34 carbon atoms such that the molar ratio of 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 towards 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.

    Binder for magnetic recording media
    38.
    发明专利
    Binder for magnetic recording media 未知

    公开(公告)号：GB2282338A

    公开(公告)日：1995-04-05

    申请号：GB9419183

    申请日：1994-09-22

    Applicant: BASF 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: A magnetic recording medium comprises a nonmagnetic substrate and at least one magnetizable layer firmly applied thereon and based on a magnetic material dispersed in a binder mixture which contains at least one hydroxyl-containing, preferably low molecular weight, polyureaurethane and at least one polyurethane-urea (meth)acrylate. The polyurethane-urea (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. The mixture comprises from 0.1 to 10% by weight of a diisocyante, 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. 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 two or more different polyfunctional amines.

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