公开(公告)号：DE3117670A1

公开(公告)日：1982-11-25

申请号：DE3117670

申请日：1981-05-05

Applicant: BASF AG

Inventor： UHL KARL DIPL ING DR ,  FALK ROLAND DIPL CHEM DR ,  SAND RUDOLF ,  NAGEL PETER DIPL ING

IPC: G11B5/82 ,  C08L67/02 ,  G11B5/73 ,  G11B5/845 ,  G11B5/84 ,  B05D5/00 ,  G11B5/68 ,  H01T13/00

公开(公告)号：DE2910807A1

公开(公告)日：1980-09-25

申请号：DE2910807

申请日：1979-03-20

Applicant: BASF AG

Inventor： DEIMLING KARL ,  FALK ROLAND DIPL CHEM DR ,  KRUG ARIBERT ,  NAGEL PETER DIPL ING ,  SAND RUDOLF

IPC: C09G1/18 ,  C09G1/00

Abstract: A process for polishing the ground surfaces of magnetic storage disks which consist of a rigid substrate provided on both sides with a firmly adhering magnetic coating consisting of a magnetic material finely dispersed in an organic polymer and conventional additives, by pressing felt rings or felt disks against the moving magnetic storage disk, to the surface of which an aqueous emulsion containing butyl acetate with or without butane-1,4-diol is applied.

公开(公告)号：CA1002822A

公开(公告)日：1977-01-04

申请号：CA185447

申请日：1973-11-09

Applicant: BASF AG

Inventor： HARTMANN JOB W ,  OSTERTAG WERNER ,  SAND RUDOLF ,  SCHAEFER DIETER ,  HARTMANN HANS J

IPC: C08L63/00 ,  G11B5/708 ,  G11B5/73 ,  G11B5/733

Abstract: The invention relates to magnetic discs in which first a non-magnetic intermediate layer and then the magnetic coating are applied by conventional methods to an aluminum disc. The intermediate layer applied to the non-magnetic metallic carrier disc is a hard non-magnetic coating which can be polished and which consists of a dispersion of a pulverulent mixture of finely divided inorganic non-magnetic pigments having a Mohs' hardness of at least 7 in a binder which can be cured and which provides firm cohesion of the pigment particles and good adhesion thereof to the non-magnetic base disc, the pigment mixture containing at least 3 percent by weight of corundum powder having a particle size of from about 1 to 20 mu u. Magnetic discs with very thin magnetic coatings which possess good magnetic and mechanical properties and whose thickness varies only minimally are thus produced in a simple manner.

公开(公告)号：DE2255028A1

公开(公告)日：1974-06-12

申请号：DE2255028

申请日：1972-11-10

Applicant: BASF AG

Inventor： HARTMANN JOB WERNER DR ,  OSTERTAG WERNER DR ,  SAND RUDOLF ,  SCHAEFER DIETER DR ,  HARTMANN HANS JOERG DR

IPC: C08L63/00 ,  G11B5/708 ,  G11B5/73 ,  G11B5/733 ,  G11B5/70

Abstract: The invention relates to magnetic discs in which first a non-magnetic intermediate layer and then the magnetic coating are applied by conventional methods to an aluminum disc. The intermediate layer applied to the non-magnetic metallic carrier disc is a hard non-magnetic coating which can be polished and which consists of a dispersion of a pulverulent mixture of finely divided inorganic non-magnetic pigments having a Mohs' hardness of at least 7 in a binder which can be cured and which provides firm cohesion of the pigment particles and good adhesion thereof to the non-magnetic base disc, the pigment mixture containing at least 3 percent by weight of corundum powder having a particle size of from about 1 to 20 mu u. Magnetic discs with very thin magnetic coatings which possess good magnetic and mechanical properties and whose thickness varies only minimally are thus produced in a simple manner.