Monocomponent developer containing positively chargeable fine power

摘要

A monocomponent electrostatographic developer is disclosed. The developer contains a negatively charging toner wherein the toner particle surface contains a positively chargeable inorganic fine powder having a mean volume average diameter of 0.5 to 7.0 mum, a cleaning ratio of 0.1 to 5.0, and a flowability improving agent having a BET specific surface area of at least 30 m2/g. A method of electrostatic imaging using the developer is also disclosed.