ELECTROGRAFISCHE ONTWIKKELAARSAMENSTELLING EN WERKWIJZE VOOR HET GEBRUIK DAARVAN.

摘要

An electrographic, two-component dry developer composition comprising charged toner particles and oppositely charged, magnetic carrier particles, which (a) comprise a magnetic material exhibiting "hard" magnetic properties, as characterized by a coercivity of at least 300 gauss and (b) an induced magnetic moment of at least 20 EMU/gm when in an applied field of 1000 gauss. The developer is employed in combination with a magnetic applicator comprising a rotatable magnetic core and an outer, nonmagnetizable shell to develop electrostatic images.