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Treated Colloidal Silica Particles for Toner Formulations

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Abstract:

Surface modified silica particles are used as external additives to toners to improve free flow, to reduce agglomeration of toner particles, and to modify the tribo-charging characteristics of the final toner formulation. In many of the new toner formulations, large diameter spherical silica particles, rather than the traditional aggregated fumed silicas, are needed to give the required performance characteristics to the toner. In fact, large (order 100 nm) spherical silica particles have been cited as an essential additive in preventing agglomeration in new toner formulations [1].

The manufacture of large treated spherical silica particles presents a variety of chemistry and processing challenges. Both the reaction and drying conditions during manufacture must be carefully controlled to produce powders with uniform treatment and minimal aggregation. In this paper, we shall discuss the effects of the treatment chemistry and the base silica particle size on toner tribo-charging and humidity stability and toner free flow for a model toner system.

Document Type: Research Article

Publication date: 2006-01-01

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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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