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Evolution and Regulatory Impact of Fumed Inorganic Materials in Toners

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This presentation will describe how two nano-structured inorganic material classes which are produced by flame processes have been crucial to the technical evolution of the toner industry during the past two decades: fumed metal oxides as external additives and carbon black as the essential pigment. Market forces driving this evolution and increasing additive diversity are the demand for high speed office printers and commercial digital presses and the need for low priced laser printers to make small office and home (SOHO) use affordable. Additionally, ecofriendly printers with reduced energy consumption and zero emissions require the development of toner with low fusing temperatures (low Tg) based on environmentally safe raw materials. Novel fumed silicon/titanium mixed oxides offer the positive tribo-charging benefits of titanium dioxide combined with the surface properties of silica. Acting as effective spacers that prevent re-agglomeration of low Tg toner, fumed sub-micron particles based on both silica and titania have distinct advantages over precipitated and sol-gel-derived materials, respectively. These include; low moisture, high purity, and the complete absence of internal porosity. For improved dispersibility and optimized toner surface coverage, de-agglomerated, chemical and mechanical structure-modified fumed metal oxides have been developed and will be discussed. Lastly, the paper will explore the impact of the ongoing EH&S (environmental, health & safety) discussion on external additives, carbon black and development trends toward safe external additives.

Document Type: Research Article

Publication date: January 1, 2008

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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