Colloidal Silica Particles for Toners: Treatment Chemistry

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Abstract:

Treated colloidal silica particles represent a new, prominent class of toner formulation additives, which have recently become commercially available. Many of the performance aspects of these particles are determined principally by the particle surface chemistry. We have found that by careful control and manipulation of the surface treatments, we can control the magnitude of the tribo-charge and manufacture additives with either a negative or a positive tribo-charge.

In this paper we present tribo-charge results for a class of silica powders manufactured from aqueous colloidal silica dispersions. Surface treatments are done using various mono- and tri-functional organosilane treating agents. Analysis of these silicas using magic angle spinning cross polarization NMR provides detailed information on the chemical moieties present on the surface and allows us to better understand how these moieties impact the performance properties of the additive.

Document Type: Research Article

Publication date: January 1, 2007

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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