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Comparison between De-agglomerated and Traditional Fumed Silica External Additives and Their Performance in Toner Formulations

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De-agglomerated hydrophobized fumed silica is compared to corresponding traditional agglomerated fumed silica as an external additive for electrophotographic toners. The first finding is that the Tribo-Electrostatic Charge (T-ESC) of toner treated with de-agglomerated silica is as strong as that with traditional silica after agitation. Charge distribution analysis however indicates faster charge-up for de-agglomerated silica. These characteristics apply for both milled conventional toner and chemically produced toner and are explained by the superior dispersibility of de-agglomerated silica. The shelf-life (storage stability) was also tested and demonstrated that de-agglomerated silica maintained performance under normal appropriate storage conditions.

Document Type: Research Article

Publication date: January 1, 2009

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  • 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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