| 摘要 |
PURPOSE:To increase the increasing rate of electrostatic charge and to eliminate the decrease of electrostatic charge quantity in the stage of running by coating the surface of a core material with a material exhibiting <=20dyne/cm critical surface energy thereby preparing a carrier for electrophotography. CONSTITUTION:A soln. dissolved with (1) a mixture composed of a fluoropolymer and polymer having positive electrostatic chargeability and (2) a random, block or graft copolymer of a fluoromonomer and positive- electrostatic chargeable monomer or the like into a suitable solvent is prepd. The core material is immersed into such soln. and is subjected to desolvating, drying and high-temp. baking to coat the layer exhibiting <=20dyne/cm critical surface energy on the core material by which the carrier for electrophotography is obtd. The amt. of the polymer to be coated on the core material is adequately 0.05-3.0wt%. The core material includes glass beads, aluminum powder, etc. and the powder having about 10-500mu grain size is used. |
