公开(公告)号：DE2255802A1

公开(公告)日：1974-05-22

申请号：DE2255802

申请日：1972-11-15

Applicant: BASF AG

Inventor： MOTZ HERBERT DR ,  BACHMANN RUDOLF DR ,  HARTMANN HANS JOERG DR

IPC: C08L75/04 ,  C09D5/23 ,  G11B5/702 ,  G11B5/68 ,  C09D3/72

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：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：DE2960644D1

公开(公告)日：1981-11-12

申请号：DE2960644

申请日：1979-10-18

Applicant: BASF AG

Inventor： MOTZ HERBERT DR ,  SCHAEFER DIETER DR DIPL CHEM ,  HUEBNER WERNER DR ,  MAYER DIETER DR

IPC: G11B5/70 ,  B01F5/06 ,  B01F15/02 ,  B05D5/12 ,  C09D5/23 ,  C09D7/12 ,  G11B5/68 ,  G11B5/84 ,  G11B5/845

Abstract: A process for the manufacture of magnetic recording media by dispersing a mixture of particulate anisotropic magnetic material and additives in a solution of a polymeric binder in an organic solvent, compressing and then releasing the pressure on the dispersion, thereafter applying a layer of the dispersion to a non-magnetizable base, orienting the anisotropic magnetic material by means of a magnetic field, and drying the coating.

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