Method to achieve tribocharge uniformity of a developer mix across different temperature and humidity conditions by modifying the surface of the magnetic carrier particle

摘要

A method for providing a developer mix having tribocharge uniformity across varying temperature and humidity conditions is provided. A developer mix used in a dual component development (DCD) system typically is a mixture of toner particles and magnetic carrier particles. Tribocharge uniformity is achieved in the developer mix by performing the step of treating the surface of the magnetic carrier particles with surface additives before the magnetic carrier particles are mixed with the toner particles. Surface additives include but are not limited to silica, titania and alumina.

主权项

1. A method for forming a developer mix to be used in an electrophotographic imaging device comprising:
providing toner particles formed an emulsion aggregation process; providing magnetic carrier particles having a polymer coating on its outer surface; surface treating the outer surface of the polymer coated magnetic carrier particles with one or more extra particular additives selected from the group consisting of silica, titania and alumina or combinations thereof: and mixing the toner particles and the surface treated polymer coated magnetic carrier particles.