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    23.
    发明专利
    未知

    公开(公告)号：DE19757670A1

    公开(公告)日：1999-07-01

    申请号：DE19757670

    申请日：1997-12-23

    Applicant: EMTEC MAGNETICS GMBH

    Inventor： LEHNER AUGUST ,  KOHL ALBERT ,  KRESS RIA DR ,  WUENSCH THOMAS DR ,  WEINGART FRANZ DR

    IPC: C09D5/23 ,  C09D175/04 ,  G11B5/702 ,  C08G18/10 ,  C08G18/32 ,  C08G18/65 ,  C08G18/38

    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.

    Materials suitable as crosslinkable binder components
    24.
    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.

    25.
    发明专利
    未知

    公开(公告)号：DE59607438D1

    公开(公告)日：2001-09-13

    申请号：DE59607438

    申请日：1996-04-26

    Applicant: EMTEC MAGNETICS GMBH

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

    IPC: C08G18/62 ,  C08G18/10 ,  C08G18/65 ,  C08G18/83 ,  C09D5/23 ,  C09D17/00 ,  G11B5/702

    Abstract: chemical industry. SUBSTANCE: described is polymeric binder for pigment-containing agents or bodies for applying coatings. Said binder is product of reaction of polymer based on at least one complex alkyl ester of alpha j beta-saturated carboxylic acid having 1-25 carbon atoms in alkyl moiety which comprises at least one starter and/or regulator which allow for presence of one end hydroxy group on one of ends of most polymeric chains with at least one multiatomic nonaromatic isocyanate at isocyanate group to hydroxy group molar ratio of (1.2- 3.9):1, reaction of the resulting isocyanate group containing product with at least one compound containing groups reactive with respect to isocyanates at molar ratio of reactive groups to free isocyanate groups present in product of (2-7):1 followed by reaction of the resulting product with at least one compound which reacts with free reactive groups and which introduces acid groups into product or with at least one compound containing groups which are active with respect to isocyanates said compound introduces acid groups into product containing isocyanate groups. The resulting binders and bodies for coatings have improved stability. EFFECT: improved properties of the polymeric binder. 7 cl, 8 ex

    Magnetic recording medium based on a polyurethane prepolymer containing hydroxyland amino groups
    29.
    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.

    Materials suitable as crosslinkable binder components
    30.
    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.

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