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Treated Fumed Alumina Particles for Toners

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Surface modified fumed metal oxide particles are used as external additives on toners in order to improve the free flow, tribo-electrostatic charging and other performance characteristics of the toner. The type of base metal oxide, particle morphology, surface area, and surface chemistry affect the properties of the additive. The type of the base metal oxide also puts certain limitations on possible chemical treatments, for instance, not all treatments used for fumed silica particles could be applied for titania and alumina.

Untreated fumed alumina particles usually show low absolute level of tribo-electrostatic charging and relatively small variation of tribo-electrostatic charge due to changes of temperature and relative humidity. In this paper we will discuss the treatments of fumed alumina particles (i.e., Cabot grades SpectrAl® 51, SpectrAl® 81, and SpectrAl® 100) with different silicone fluids and different alkoxy silanes and the effect of these treatments on the properties of the additive. In particular, the effect of surface treatments on the absolute level of tribo-electrostatic charging, tribo-electrostatic charge humidity sensitivity, and free flow will be addressed.

Document Type: Research Article

Publication date: January 1, 2006

More about this publication?
  • For more than 25 years, NIP has been the leading forum for discussion of advances and new directions in non-impact and digital printing technologies. A comprehensive, industry-wide conference, this meeting includes all aspects of the hardware, materials, software, images, and applications associated with digital printing systems, including drop-on-demand ink jet, wide format ink jet, desktop and continuous ink jet, toner-based electrophotographic printers, production digital printing systems, and thermal printing systems, as well as the engineering capability, optimization, and science involved in these fields.

    Since 2005, NIP has been held in conjunction with the Digital Fabrication Conference.

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