公开(公告)号：DE3227163A1

公开(公告)日：1984-01-26

申请号：DE3227163

申请日：1982-07-21

Applicant: BASF AG

Inventor： LEHNER AUGUST ,  VELIC MILAN DR ,  KOPKE HELMUT ,  MELZER MILENA ,  BALZ WERNER DR ,  LENZ WERNER DR ,  BAUR REINHOLD DR

IPC: C08L75/04 ,  G11B5/702 ,  G11B5/70

Abstract: The invention relates to magnetic recording supports made of a non-magnetic support material which is provided with a magnetic layer, essentially consisting of a dispersion of an anisotropic magnetic material in a mixture of a polyurea urethane binder containing OH groups, which is crosslinked with a polyisocyanate, and a physically drying binder in a mixing ratio of 1:0.8 to 1:0.1.

公开(公告)号：DE3341698A1

公开(公告)日：1985-05-30

申请号：DE3341698

申请日：1983-11-18

Applicant: BASF AG

Inventor： LEHNER AUGUST ,  BALZ WERNER DR ,  VELIC MILAN DR ,  KOPKE HELMUT ,  GRAU WERNER DR ,  BAUR REINHOLD DR

IPC: C09D5/23 ,  C09D127/04 ,  C09D127/06 ,  C09D175/00 ,  C09D175/04 ,  C09D175/06 ,  G11B5/702 ,  H01F10/10 ,  G11B5/68 ,  C09D3/72

Abstract: Magnetic recording media comprise a non-magnetic base which is provided with a magnetic layer consisting of finely divided anisotropic magnetic material which is dispersible in binders and additives, the binder being a mixture of (1) an OH-containing polyurethane which is crosslinked with polyisocyanates, (2) a high molecular weight thermoplastic linear polyurethane and (3) a polyvinylformal binder, a phenoxy resin, a cellulose ester or a vinyl chloride copolymer.

公开(公告)号：DE3227161A1

公开(公告)日：1984-01-26

申请号：DE3227161

申请日：1982-07-21

Applicant: BASF AG

Inventor： LEHNER AUGUST ,  VELIC MILAN DR ,  KOPKE HELMUT ,  BALZ WERNER DR ,  LENZ WERNER DR ,  BAUR REINHOLD DR

IPC: C08G18/10 ,  C08G18/12 ,  C08G18/65 ,  C08L75/04 ,  C09D5/23 ,  C09D127/04 ,  C09D127/06 ,  C09D171/00 ,  C09D171/12 ,  C09D175/00 ,  C09D175/02 ,  C09D175/06 ,  G11B5/702 ,  G11B5/73 ,  G11B5/70

Abstract: The invention relates to a magnetic recording support made of a non-magnetic support material which is provided with a magnetic layer, essentially consisting of a dispersion of an anisotropic magnetic material in a polyurethane binder mixture which is crosslinked with polyisocyanate, and in which the polyurethane binder mixture consists of a low-molecular weight polyurea urethane containing OH groups and a high-molecular weight thermoplastic linear polyurethane in a mixing ratio of 9:1 to 1:9.

公开(公告)号：DE2861559D1

公开(公告)日：1982-03-04

申请号：DE2861559

申请日：1978-11-25

Applicant: BASF AG

Inventor： MOTZ HERBERT DR ,  LEHNER AUGUST ,  HARTMANN HEINRICH DR ,  BACHMANN RUDOLF DR ,  HARTMANN HANS-JOERG DR ,  FRISCHMANN HARALD DR ,  FALK ROLAND DR ,  HACK JOACHIM ,  VELIC MILAN DR ,  KOPKE HELMUT

IPC: C08G18/66 ,  C09D5/23 ,  G11B5/70 ,  G11B5/702

Abstract: Magnetic recording media comprising a non-magnetic base and, applied thereto, a firmly adhering magnetic coating based on a finely divided magnetic pigment dispersed in a binder which contains at least 50 percent by weight of a special polyurethane elastomer, namely a thermoplastic polyurethane which is soluble in tetrahydrofuran, is free from isocyanate groups and has been manufactured from (A) 1 mole of a hydroxyl-containing polyester having a molecular weight of from 700 to 2,500, (B) from 0.3 to 3 moles of a linear aliphatic diol of 2 to 10 carbon atoms, (C) from 0.05 to 0.4 mole of a triol of 3 to 10 carbon atoms, and (D) from 1.35 to 4.7 moles of a diisocyanate of 6 to 30 carbon atoms, the amount of NCO groups being approximately equivalent to the amount of OH groups of the sum of components (A) to (C).

公开(公告)号：DE3886504D1

公开(公告)日：1994-02-03

申请号：DE3886504

申请日：1988-10-25

Applicant: BASF AG

Inventor： LEHNER AUGUST ,  KOHL ALBERT ,  ROLLER HERMANN ,  LENZ WERNER DR ,  KREITNER LUDWIG DR ,  KOPKE HELMUT ,  SOMMERMANN FRIEDRICH DR ,  RICKER ERNST DR

IPC: C09D5/23 ,  C09D175/00 ,  C09D175/04 ,  G11B5/70 ,  G11B5/702

Abstract: The invention relates to magnetic recording media consisting of a nonmagnetic substrate and at least one magnetisable layer bonded thereon and based on a magnetic material finely divided in a binder, consisting of at least 50% by weight of polyurethane, and further conventional additives, the magnetisable layer furthermore containing a saturated, branched hydrocarbon.

公开(公告)号：DE3381028D1

公开(公告)日：1990-02-01

申请号：DE3381028

申请日：1983-07-11

Applicant: BASF AG

Inventor： LEHNER AUGUST ,  VELIC MILAN DR ,  KOPKE HELMUT ,  BALZ WERNER DR ,  LENZ WERNER DR ,  BAUR REINHOLD DR ,  MELZER MILENA

IPC: C08L75/04 ,  G11B5/702

Abstract: Magnetic recording media comprising a non-magnetic base which is provided with a magnetic layer which consists essentially of a dispersion of an anisotropic magnetic material in a mixture of an OH-containing polyurea-urethane binder, which is crosslinked with a polyisocyanate, with a physically drying binder.

公开(公告)号：DE3276884D1

公开(公告)日：1987-09-03

申请号：DE3276884

申请日：1982-12-11

Applicant: BASF AG

Inventor： MELZER MILENA ,  SCHNEIDER NORBERT ,  KOPKE HELMUT ,  SCHOETTLE KLAUS ,  KOESTER EBERHARD DR ,  BALZ WERNER DR ,  GRAU WERNER DR

IPC: C08L75/06 ,  C09D5/23 ,  C09D171/00 ,  C09D171/10 ,  C09D175/06 ,  G11B5/70 ,  G11B5/702 ,  G11B5/84 ,  G11B5/842

公开(公告)号：CA995069A

公开(公告)日：1976-08-17

申请号：CA188969

申请日：1973-12-27

Applicant: BASF AG

Inventor： HARTMANN HANS J ,  VAETH GUENTER ,  KOPKE HELMUT

IPC: C09D5/23 ,  G11B5/70 ,  G11B5/702 ,  G11B5/706 ,  G11B5/708

公开(公告)号：DE2428875A1

公开(公告)日：1976-01-02

申请号：DE2428875

申请日：1974-06-14

Applicant: BASF AG

Inventor： GRAU WERNER DR ,  KOPKE HELMUT ,  OHLINGER MANFRED DR ,  SCHNEEHAGE HENNING DR ,  SCHOENAFINGER EDUARD DR

IPC: C01G49/06 ,  G11B5/706 ,  H01F1/11 ,  G11B5/68

Abstract: A process for the manufacture of acicular gamma-iron(III) oxide which, because of its improved dispersibility in organic binders, is suitable for the manufacture of magnetic recording media exhibiting a particularly high orientation ratio. For this purpose, the non-magnetic acicular alpha -iron(III) oxide or goethite pigment is treated with from 0.5 to 10% by weight, based on the pigment, of a compound of the formula I: (I) where R1, R2 and R3 are hydrogen, alkyl of 1 to 24 carbon atoms or alkenyl of 1 to 24 carbon atoms and (RX)- is selected from the group consisting of an aliphatic carboxylic acid of 1 to 18 carbon atoms, an aromatic carboxylic acid of 1 to 18 carbon atoms, a sulfonic acid and an ester of phosphoric acid and is then further processed by conventional methods to give gamma-iron(III) oxide.

公开(公告)号：DE2300020A1

公开(公告)日：1974-07-25

申请号：DE2300020

申请日：1973-01-02

Applicant: BASF AG

Inventor： HARTMANN HANS JOERG DR ,  VAETH GUENTER ,  KOPKE HELMUT

IPC: C09D5/23 ,  G11B5/70 ,  G11B5/702 ,  G11B5/706 ,  G11B5/708 ,  G11B5/68