External Additives for Toners: Characteristics of Fumed Silica, Colloidal Silica, and Next Generation Materials
Abstract:Demand for higher print resolution and reduced energy consumption is driving development of smaller and softer toners. Embedding of external additives into soft toners during the development and deterioration of properties such as cohesion and tribocharge is one of the major problems that toner formulators face. In order to protect small particles on the toner surface from being embedded, large particle silica is often used as a spacer particle. Over the last ten years, spacer additives have become a crucial component of modern formulations. Cabot has recently significantly extended its portfolio of external additives for toners with an emphasis on large particle silica. In particular, several new grades based on 60 m2/g fumed silica, and colloidal silicas with particle sizes between 40 and 200 nm have been introduced. In this paper, we present performance data for a set of fumed and colloidal silicas that illustrates the effect of different surface treatments. In addition, Cabot has developed novel silica-polymer composite particles that show promise as spacer additives. These materials show reduced drop off from the toner surface compared to colloidal silica of similar size, potentially allowing formulators to use larger size spacer particles.
Document Type: Research Article
Publication date: 2012-01-01
For more than 30 years, IS&T's series of digital printing conferences have been the leading forum for discussion of advances and new directions in 2D and 3D printing technologies. A comprehensive, industry-wide conference that brings together industry and academia, this meeting includes all aspects of the hardware, materials, software, images, and applications associated with digital printing systems?particularly those involved with additive manufacturing and fabrication?including bio-printing, printed electronics, page-wide, drop-on-demand, desktop and continuous ink jet, toner-based systems, and production digital printing, as well as the engineering capability, optimization, and science involved in these fields. In 2016, the conference changed its name formally to Printing for Fabrication to better reflect the content of the meeting and the evolving technology of printing.
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