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Silica-Polymer Composite Particles for Toners: Synthesis, Characterization and Performance

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Evolution of toner technology together with a demand for faster printing puts new requirements on external additives used in toner formulations. Spacer particles, which are added to protect the toner surface from mechanical stress resulting from collisions with the particles of carrier or the doctor blade, have become a progressively more important part of the additives packages.

Polymeric particles, colloidal silica, and low surface area fumed silica are usually used as spacers. However, each of these materials has significant drawbacks. For instance, triboelectric charging properties of polymeric particles are not always optimal, large colloidal silica often drops off from toner surface, and low surface area fumed silica typically has broader than desired aggregate size distribution.

At the NIP28 conference we introduced the organic/inorganic composite spacer additives which combine benefits of polymeric and colloidal silica spacer additives [1]. We demonstrated that the new particles have lower drop off from the toner surface than colloidal silica additives.

In this paper we demonstrate how the new material particle size and shape could be controlled and present results of a print test where a model toner was formulated with the silica-polymer composite spacer additives.

Document Type: Research Article

Publication date: January 1, 2013

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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