公开(公告)号：DE4233999A1

公开(公告)日：1994-04-14

申请号：DE4233999

申请日：1992-10-09

Applicant: BASF MAGNETICS GMBH

Inventor： LATZEL WERNER DR ,  ENGELHARDT PETER ,  RUDOLF PETER DR ,  SCHWARZ LOTHAR ,  HEILMANN PETER DR ,  ROLLER HERMANN ,  LEHNER AUGUST

IPC: G11B5/73 ,  G11B5/735 ,  G11B5/62 ,  G11B5/72

Abstract: Magnetic recording media with a coating on the reverse side is produced, consisting of a non-magnetic substrate, a magnetic coating on the main side, and, on the other side, a coating made up of a polymer binder, non-magnetic fillers, pigments, dispersing agents and other usual additives. The material for this reverse coating is produced by separately mixing the various solid particles and additives with part of a solution of the binder so as to coat the particles with the organic substances concerned; this mix is next dispersed by means of a ball mill, metered quantities of the dispersion obtained plus the remaining solution of binder are then intensively mixed in a toothed colloid mill against the direction of feed before being applied to the reverse side of the sheeting. ADVANTAGE - The method produces stable dispersions from a wide variety of solid materials. It does so with a high space-time output. Existing types of dispersion can be used without increasing the quantity of dispersion agent. It improves the fault count in the reverse side layer and hence improves the recording quality of the medium.

公开(公告)号：DE4227872A1

公开(公告)日：1994-02-24

申请号：DE4227872

申请日：1992-08-22

Applicant: BASF MAGNETICS GMBH

Inventor： LEHNER AUGUST ,  SCHNEIDER NORBERT ,  ROLLER HERMANN ,  BALZ WERNER DR ,  LENZ WERNER DR ,  KOHL ALBERT ,  STRANSKY REINHARD

IPC: C08K3/08 ,  C08K3/02 ,  C09D5/23 ,  G11B5/708 ,  G11B5/702

Abstract: The invention relates to magnetic recording media obtained by preparing a dispersion of an anisotropic magnetic material and conventional additives in a solution of a polymer binder in an organic solvent, coating the dispersion onto a non-magnetisable support material, subsequently aligning the anisotropic magnetic material in a magnetic field and solidifying the applied magnetic coating, where the magnetic coating contains finely divided organic hydrophobic supporting pigments.

公开(公告)号：DE4117980A1

公开(公告)日：1992-12-03

申请号：DE4117980

申请日：1991-05-31

Applicant: BASF MAGNETICS GMBH

Inventor： ROLLER HERMANN ,  HEILMANN PETER DR ,  HITZFELD MICHAEL DR ,  STOCKBURGER DIETER DR ,  LATZEL WERNER DR ,  BAUR REINHOLD DR ,  ENGELHARDT PETER ,  ROTHFUSS EDWIN ,  GRAU WERNER DR ,  LENZ WERNER DR

IPC: C09D5/23 ,  C09D127/04 ,  C09D127/06 ,  C09D175/00 ,  C09D175/04 ,  G11B5/73 ,  G11B5/735

Abstract: The invention relates to flexible magnetic recording supports (media) which are essentially composed of a sheet-type nonmagnetic substrate, a magnetic layer applied to one principal side of the sheet-type substrate and a back layer formed on the opposite principal side of the substrate and composed of a polymeric binder, at least one filler, at least one auxiliary pigment and polyolefin particles having a spherical shape.