公开(公告)号：DE59803043D1

公开(公告)日：2002-03-21

申请号：DE59803043

申请日：1998-12-16

Applicant: EMTEC MAGNETICS GMBH

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

公开(公告)号：DE10017489A1

公开(公告)日：2001-10-11

申请号：DE10017489

申请日：2000-04-07

Applicant: EMTEC MAGNETICS GMBH

Inventor： VEITCH RONALD ,  JAKUSCH HELMUT ,  KOHL ALBERT ,  KRESS RIA ,  SANDROCK JOHANNES ,  MUELLER STEFAN ,  ILMER ANDREAS ,  HEILMANN PETER

IPC: B42D15/10 ,  G11B5/62 ,  G11B5/70 ,  G11B5/706 ,  G11B5/708 ,  G11B5/712 ,  G11B5/714 ,  G11B5/716 ,  G11B5/842 ,  G11B5/845 ,  G11B5/852 ,  H01F1/34 ,  G11B5/68 ,  C01G49/02 ,  B32B15/08

Abstract: Magnetic recording medium comprises an upper magnetic recording layer of thickness of less than 0.5 mu m containing a fine magnetic pigment having a coercive force of 80-250 kA/m on a non-magnetic carrier; and a lower isotropic soft magnetic layer made from \=g-Fe2O3, Fe3O4 or a mixed crystal of the two. The coercive force of the lower layer is less than 4 kA/m and the non-hysteresis susceptibility of the lower layer at 2 kA/m is more than 7. An Independent claim is also included for a process for the production of a magnetic recording medium. Preferred Features: The magnetic pigment in the upper layer is a metal pigment or a metal alloy pigment, preferably a hexagonal ferrite pigment or a Co-modified \=g-Al2O3, Co-modified Fe3O4 or a mixed crystal of these. The soft magnetic pigment in the lower layer is made from an aluminum compound and/or a silicon compound.

公开(公告)号：DE19945401A1

公开(公告)日：2001-04-05

申请号：DE19945401

申请日：1999-09-22

Applicant: EMTEC MAGNETICS GMBH

Inventor： RAETHER BENEDIKT ,  KRESS RIA ,  HEES ULRIKE ,  KOHL ALBERT ,  MAIER GERHARD ,  BRADSHAW RICHARD

IPC: C08L75/04 ,  C08G18/78 ,  C09D175/04 ,  C09J175/04 ,  G11B5/702 ,  C08L75/00 ,  C08L53/00

Abstract: Binder compositions containing inorganic fillers and thermoplastic polyurethane block copolymers with soft and hard segments, in which at least one hard segment contains a bicyclic structural element formed by the criss-cross polyaddition reaction between a di-isocyanate and an azine compound. A binder composition (BC) containing (at least) (i) an inorganic filler and (ii) thermoplastic polyurethane block copolymer(s) (TPU) with soft segment(s) (A) and hard segment(s) (B), in which at least one of the hard segments contains a structural element of formula (I): R , R = optionally substituted 4-20C aromatic or heteroaromatic groups, with R = R = H, or R -R = essentially completely fluorinated 1-10C alkyl; R , R = linear or branched aliphatic residues, cycloaliphatic residues or aromatic residues (all with 4-20C, all optionally substituted); n = 1-100 . An Independent claim is also included for a method for the production of BC by mixing components (i) and (ii) together.

公开(公告)号：DE19945400A1

公开(公告)日：2001-04-05

申请号：DE19945400

申请日：1999-09-22

Applicant: EMTEC MAGNETICS GMBH

Inventor： RAETHER BENEDIKT ,  KRESS RIA ,  HEES ULRIKE ,  KOHL ALBERT ,  BRADSHAW RICHARD

IPC: C08G18/40 ,  C08G18/00 ,  C08G18/08 ,  C08G18/42 ,  G11B5/702 ,  G11B5/84 ,  C08L75/04 ,  C09D175/04

Abstract: Thermoplastic polyurethane (TPU) block copolymers with soft segment(s) (A) and hard segment(s) (B), in which at least one hard segment B contains anionic, cationic or non-ionic anchor group(s) (L) or a mixture of two such groups. Independent claims are also included for the following: (a) binders containing TPU as described above; (b) magnetic dispersions containing a binder as in (a) and magnetic or magnetisable material(s); (c) a process for the production of TPU by reacting at least difunctional, NCO-terminated, linear or branched polyurethane prepolymer(s) (as hard segment) with linear or branched soft segment(s) containing functional groups which are reactive towards isocyanate groups; and (d) magnetic recording media containing binders as in (a).

公开(公告)号：NO20004714D0

公开(公告)日：2000-09-21

申请号：NO20004714

申请日：2000-09-21

Applicant: EMTEC MAGNETICS GMBH

Inventor： RAETHER BENEDIKT ,  HEES ULRIKE ,  KRESS RIA ,  KOHL ALBERT ,  BRADSHAW RICHARD ,  MAIER GERHARD

IPC: C08L75/04 ,  C08G18/78 ,  C09D175/04 ,  C09J175/04 ,  G11B5/702 ,  C08L

Abstract: Binder compositions containing inorganic fillers and thermoplastic polyurethane block copolymers with soft and hard segments, in which at least one hard segment contains a bicyclic structural element formed by the criss-cross polyaddition reaction between a di-isocyanate and an azine compound. A binder composition (BC) containing (at least) (i) an inorganic filler and (ii) thermoplastic polyurethane block copolymer(s) (TPU) with soft segment(s) (A) and hard segment(s) (B), in which at least one of the hard segments contains a structural element of formula (I): R , R = optionally substituted 4-20C aromatic or heteroaromatic groups, with R = R = H, or R -R = essentially completely fluorinated 1-10C alkyl; R , R = linear or branched aliphatic residues, cycloaliphatic residues or aromatic residues (all with 4-20C, all optionally substituted); n = 1-100 . An Independent claim is also included for a method for the production of BC by mixing components (i) and (ii) together.

公开(公告)号：AU756079B2

公开(公告)日：2003-01-02

申请号：AU5506899

申请日：1999-07-24

Applicant: EMTEC MAGNETICS GMBH

Inventor： ILMER ANDREAS ,  LENZ WERNER ,  KRESS RIA ,  HEILMANN PETER ,  VEITCH RONALD ,  JAKUSCH HELMUT ,  HOFFMANN ERICH

IPC: G11B5/68 ,  G11B5/70 ,  G11B5/706 ,  G11B5/708 ,  G11B5/716

Abstract: Digital recording procedures wherein the recording support is not exposed to an obliterating magnetic field before recording are known in recent times. Such recording supports must therefore have good rewrite capability. It has been found that said requirement is fulfilled by two-layered recording supports, wherein the top layer contains a metal or metal alloy powder and has a density of less than 0.3 mu m and wherein the bottom layer contains a magnetic pigment. The coercitive force of the bottom layer has at the most two thirds the coercitive force of the top layer and the remanent magnetization of the bottom layer is at least 32 kA/m.

公开(公告)号：AU1501302A

公开(公告)日：2002-04-22

申请号：AU1501302

申请日：2001-10-09

Applicant: EMTEC MAGNETICS GMBH

Inventor： HEES ULRIKE ,  BOHRMANN HANS-GUENTER ,  RAETHER BENEDIKT ,  KRESS RIA ,  KOHL ALBERT

IPC: C08G18/08 ,  C08G18/40 ,  C08G18/50 ,  C08G18/76 ,  C09D5/23 ,  G11B5/702

Abstract: A polyurethane having at least one anionic anchor group L, the anchor group L being covalently bonded to a polyether segment having at least one nitrogen atom in the polyurethane.

公开(公告)号：DE19945401C2

公开(公告)日：2002-02-07

申请号：DE19945401

申请日：1999-09-22

Applicant: EMTEC MAGNETICS GMBH

Inventor： RAETHER BENEDIKT ,  KRESS RIA ,  HEES ULRIKE ,  KOHL ALBERT ,  MAIER GERHARD ,  BRADSHAW RICHARD

IPC: C08L75/04 ,  C08G18/78 ,  C09D175/04 ,  C09J175/04 ,  G11B5/702 ,  C08G18/79

Abstract: Binder compositions containing inorganic fillers and thermoplastic polyurethane block copolymers with soft and hard segments, in which at least one hard segment contains a bicyclic structural element formed by the criss-cross polyaddition reaction between a di-isocyanate and an azine compound. A binder composition (BC) containing (at least) (i) an inorganic filler and (ii) thermoplastic polyurethane block copolymer(s) (TPU) with soft segment(s) (A) and hard segment(s) (B), in which at least one of the hard segments contains a structural element of formula (I): R , R = optionally substituted 4-20C aromatic or heteroaromatic groups, with R = R = H, or R -R = essentially completely fluorinated 1-10C alkyl; R , R = linear or branched aliphatic residues, cycloaliphatic residues or aromatic residues (all with 4-20C, all optionally substituted); n = 1-100 . An Independent claim is also included for a method for the production of BC by mixing components (i) and (ii) together.

公开(公告)号：AU5506899A

公开(公告)日：2000-03-21

申请号：AU5506899

申请日：1999-07-24

Applicant: EMTEC MAGNETICS GMBH

Inventor： ILMER ANDREAS ,  LENZ WERNER ,  KRESS RIA ,  HEILMANN PETER ,  VEITCH RONALD ,  JAKUSCH HELMUT ,  HOFFMANN ERICH

IPC: G11B5/68 ,  G11B5/70 ,  G11B5/706 ,  G11B5/708 ,  G11B5/716

Abstract: Digital recording procedures wherein the recording support is not exposed to an obliterating magnetic field before recording are known in recent times. Such recording supports must therefore have good rewrite capability. It has been found that said requirement is fulfilled by two-layered recording supports, wherein the top layer contains a metal or metal alloy powder and has a density of less than 0.3 mu m and wherein the bottom layer contains a magnetic pigment. The coercitive force of the bottom layer has at the most two thirds the coercitive force of the top layer and the remanent magnetization of the bottom layer is at least 32 kA/m.

公开(公告)号：DE19838799A1

公开(公告)日：2000-03-02

申请号：DE19838799

申请日：1998-08-26

Applicant: EMTEC MAGNETICS GMBH

Inventor： ILMER ANDREAS ,  LENZ WERNER ,  KRESS RIA ,  HEILMANN PETER ,  VEITCH RONALD ,  JAKUSCH HELMUT ,  HOFFMANN ERICH

IPC: G11B5/68 ,  G11B5/70 ,  G11B5/706 ,  G11B5/708 ,  G11B5/716

Abstract: Digital recording procedures wherein the recording support is not exposed to an obliterating magnetic field before recording are known in recent times. Such recording supports must therefore have good rewrite capability. It has been found that said requirement is fulfilled by two-layered recording supports, wherein the top layer contains a metal or metal alloy powder and has a density of less than 0.3 mu m and wherein the bottom layer contains a magnetic pigment. The coercitive force of the bottom layer has at the most two thirds the coercitive force of the top layer and the remanent magnetization of the bottom layer is at least 32 kA/m.