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    Magnetic recording media
    21.
    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.

    24.
    发明专利
    未知

    公开(公告)号：FR2710773B1

    公开(公告)日：1997-10-31

    申请号：FR9411515

    申请日：1994-09-27

    Applicant: BASF MAGNETICS GMBH

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

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

    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.

    26.
    发明专利
    未知

    公开(公告)号：DE19516784A1

    公开(公告)日：1996-11-14

    申请号：DE19516784

    申请日：1995-05-11

    Applicant: BASF MAGNETICS GMBH

    Inventor： BRODT GREGOR ,  WEINGART FRANZ ,  LEHNER AUGUST ,  KOHL ALBERT ,  KRESS RIA ,  SCHELBLE JOSEF ,  SCHNEIDER NORBERT

    IPC: C08G18/10 ,  C08G18/62 ,  C08G18/65 ,  C08G18/83 ,  C08L75/00 ,  C08L101/00 ,  C08L101/12 ,  C09D5/23 ,  G11B5/702 ,  G11B5/73 ,  C08L75/04 ,  C09D17/00

    Abstract: Polymeric materials (I), suitable for use as dispersing resins, are obtd. by reacting (1) a polymer (II) of (a) 80-100 mole% (1-25C alkyl)-ester of an alpha , beta -unsatd. carboxylic acid, (b) 0-20 mole% other comonomer(s) and (c) a starter and/or regulator to produce OH end gps. on most of the polymer chains with (2) a polyfunctional isocyanate (III) to give a prod. (IV), using a mole ratio of (NCO gps.):(OH gps. in II) = 1.2-3.9, and (3) reacting (IV) with (a) a cpd. contg. NCO-reactive gps., with a ratio of 2-7 moles reactive gps. per mole free NCO gps. in (IV), and then reacting the prod. obtd. (VI) with a cpd. (VII) which reacts with the free reactive gps. to introduce acid gps., or (b) a NCO-reactive cpd. (VIII) which itself enables the introduction of acid gps. Also claimed is (i) this process as such, (ii) pigment prepns. contg. a pigment (pref. a magnetic pigment) and material (I), and (iii) magnetic recording materials contg. magnetic pigments treated with (I).

    Materials suitable as crosslinkable binder components
    28.
    发明专利
    Materials suitable as crosslinkable binder components 未知

    公开(公告)号：GB2285807A

    公开(公告)日：1995-07-26

    申请号：GB9500512

    申请日：1995-01-11

    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: Polymeric materials (I) having an average molecular weight from 4000 to 30,000 are obtainable by reacting 1) A polyurethane (II) comprising a) 1 mol of a diol (III) having an average molecule 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.

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