| 摘要 |
PURPOSE:To obtain a carrier superior in acceptance potential and adhesion between a core and a coating material by coating a core with the coating material of a specified compd. CONSTITUTION:The surface of the core is coated with a compd. or a condensate of said compd. represented by the formula in which (n) is an integer of 0-3; R is an optionally substd. hydrocarbon group, e.g., a lower alkyl, such as methyl, ethyl, n-butyl, or t-amyl; and X is a univalent or multivalent carboxylic acid residue having a perfluoroalkyl group in the molecule, and said group is directly or indirectly combined with this carboxylic group. As the core, 20-500mum diameter particles, such as those of Fe3O4, MnZn ferrite, Cr2O3, iron, nickel, or glass beads, are exemplified. An amt. of coating material to be used is 0.001-5wt%, preferably, 0.01-2.5wt% of the core. |
