OXIDE-COATED CARRIERS AND PREPARATION AND USE THEREOF

摘要

A novel carrier which is stable and effective over long cycle times (6 x 105 prints), has an iron oxide coating of the formula (FeO)x . Fe2O3 where x = 0.1 - 1 and is obtained by treating steel cores (or balls) with defined small amounts of sulfuric acid of defined concentration, partial oxidation of the cores thus treated and drying at 60-150.degree.C at ? 100 mbar.