公开(公告)号：DE3831091A1

公开(公告)日：1990-03-29

申请号：DE3831091

申请日：1988-09-13

Applicant: BASF AG

Inventor： CZECH ERWIN DR ,  OSTERTAG WERNER DR ,  SCHULZE-HAGENEST STUTTGART DR ,  SCHMITT FRANZ-ULRICH DR

IPC: C23C8/18 ,  G03G9/097 ,  G03G9/107 ,  G03G9/113

Abstract: The novel carriers consist of steel cores which have an iron oxide- containing coating of the formula (FeO)x . Fe2O3 where x = 0.1 - 1. The carriers are stable and effective over long cycle times (6 .10 prints). … The carriers are obtained by treating steel cores (steel spheres) with defined small amounts of sulphuric acid of defined concentration, partial oxidation of the treated cores and drying at 60-150 DEG C at