公开(公告)号：DE2512450A1

公开(公告)日：1976-10-07

申请号：DE2512450

申请日：1975-03-21

Applicant: BASF AG

Inventor： HACK HOACHIM DIPL ING ,  SCHAEFER DIETER DIPL CHEM DR ,  MOTZ HERBERT DIPL ING DR

IPC: G11B5/708 ,  G11B5/72 ,  H01F10/02

Abstract: Magnetic recording media comprising a base and, applied thereto, at least one firmly adhering magnetic layer based on magnetic particles dispersed in a mixture of organic binders, wherein at least the uppermost magnetic layer additionally contains non-magnetic particles of precipitated silica having a primary particle diameter of from 0.02 to 0.1 mu , a secondary particle diameter of from 2 to 4 mu and a pH of from 5 to 8.