公开(公告)号：DE4012240A1

公开(公告)日：1991-10-17

申请号：DE4012240

申请日：1990-04-14

Applicant: BASF AG

Inventor： SUETTINGER RUDOLF DR ,  KLEIN URSULA

IPC: G01R33/032 ,  G01R33/12

Abstract: The orientation ratio (Rf) of a magnetic layer is defined as the ratio of the magnetizations in the playing direction and the crosswise direction. Assuming that the magnetic layer has anisotropy with respect to the transmittance of infrared light, owing to the orientation of the magnetic pigments, infrared light from a source (IR) is passed through a polarizer (P). The linearly polarized light strikes the magnetic recording medium (M), which is conveyed over a transparent support (T). The support and polarizer are adjusted with respect to one another so that a detector (D) is exposed to maximum light intensity, which is proportional to the orientation ratio (Rf).

公开(公告)号：DE3721742A1

公开(公告)日：1989-01-12

申请号：DE3721742

申请日：1987-07-01

Applicant: BASF AG

Inventor： SCHNEIDER NORBERT ,  NOWAK UWE DR ,  NICKOLAY GERD ,  KLEIN URSULA ,  LENZ WERNER DR ,  JAKUSCH HELMUT DR ,  KOCH VOLKER DR ,  DOMAS FRIEDRICH

IPC: C09D5/23 ,  C09D7/12 ,  G11B5/708 ,  G11B5/82 ,  G11B5/72 ,  H01F10/10

公开(公告)号：DE2228643A1

公开(公告)日：1974-01-10

申请号：DE2228643

申请日：1972-06-13

Applicant: BASF AG

Inventor： HARTMANN WERNER JOB DR ,  HARTMANN HANS-JOERG DR ,  MAYER DIETER DR ,  FELLEISEN PETER DIPL ING ,  KLEIN URSULA ,  MOTZ HERBERT DR

IPC: G11B5/62 ,  G11B5/708 ,  G11B5/72

公开(公告)号：DE2744309A1

公开(公告)日：1979-04-12

申请号：DE2744309

申请日：1977-10-01

Applicant: BASF AG

Inventor： BAUR REINHOLD DIPL PHYS DR ,  HARTMANN HANS-JOERG DR ,  KLEIN URSULA ,  MOTZ HERBERT DR

IPC: C09D5/23 ,  G11B5/70 ,  G11B5/68

Abstract: Prodn. of a magnetic-recording material involves dispersing finely-divided magnetically anisotropic material and usual additives in a soln. of a polymeric binder in an organic solvent, applying it to an unmagnetisable substrate, aligning the magnetic material with a magnetic field and drying and/or hardening. Improvement is that a 2-imidazoline cpd. of formula (I) (where R is 2-20C linear or branched (un)satd. hydrocarbyl; Y is OH or amino) is added as dispersant. The packing density of the particles and hence the remanent magnetisation are increased.

公开(公告)号：DE2364877A1

公开(公告)日：1975-07-03

申请号：DE2364877

申请日：1973-12-28

Applicant: BASF AG

Inventor： GROSS EGON VON DIPL CHEM DR ,  STRITZINGER HEINZ DIPL ING ,  HARTMANN JOB-WERNER DIPL CHEM ,  STEUERWALD MANFRED ,  KLEIN URSULA ,  SCHAEFER DIETER DIPL CHEM DR

IPC: C09D5/23 ,  G11B5/702 ,  G11B5/68

Abstract: Magnetic recording media comprising a non-magnetizable flexible base and a firmly adhering magnetic coating based on a dispersion, containing a silane, of a magnetic pigment in a polymeric binder, and a process for their manufacture. The silane is an aminoalkylsilane RnSi(OR')4-n, wherein n is 1, 2 or 3, R' is alkyl of 1 to 8 carbon atoms and R is aminoalkyl of the formula with one or more primary and/or secondary amino groups and from 3 to 11 carbon atoms. Magnetic recording media comprising a magnetic coating containing such a silane exhibit better abrasion resistance and better electromagnetic properties than comparable coatings.

公开(公告)号：DE59105824D1

公开(公告)日：1995-08-03

申请号：DE59105824

申请日：1991-04-08

Applicant: BASF AG

Inventor： SUETTINGER RUDOLF DR ,  KLEIN URSULA

IPC: G01R33/032 ,  G01R33/12

Abstract: The orientation ratio (Rf) of a magnetic layer is defined as the ratio of the magnetizations in the playing direction and the crosswise direction. Assuming that the magnetic layer has anisotropy with respect to the transmittance of infrared light, owing to the orientation of the magnetic pigments, infrared light from a source (IR) is passed through a polarizer (P). The linearly polarized light strikes the magnetic recording medium (M), which is conveyed over a transparent support (T). The support and polarizer are adjusted with respect to one another so that a detector (D) is exposed to maximum light intensity, which is proportional to the orientation ratio (Rf).

公开(公告)号：DE4142635A1

公开(公告)日：1993-06-24

申请号：DE4142635

申请日：1991-12-21

Applicant: BASF AG

Inventor： SCHNEIDER NORBERT ,  LEHNER AUGUST ,  KLEIN URSULA ,  LENZ WERNER DR ,  BALZ WERNER DR ,  KOHL ALBERT ,  BETTINGER GUENTER

IPC: F02B75/02 ,  G11B5/708

Abstract: A magnetic recording material is produced by spreading a dispersion of anisotropic material particles together with other particles in a fluid solution over the surface of a corner. The solution consists of a polymer binding agent in an organic fluid. The material is passed through a magnetic field to orientate the magnetic particles. The mixture has carbon in a water repellent polysilicic acid in 0.3 to 5 percent by weight. ADVANTAGE - Avoids high wear resistant over wide temperature range.