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Toner Charge Control with Externally-Added CCA Particles

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Externally-added charge control agents (EA-CCA) were prepared by means of a coacervation process. Spherical silica particles of 100 nm average diameter were coated with two kinds of charge control agents (CCAs); one is a polymer type P-1 and the other is a low molecular weight type P-2. Both of them make a remarkable contribution to toner charge. In a concentration range from 1 to 1×103 ppm of CCA on toner, toner charge increased. From the relationship between the amount of EA-CCA in the toner and the tribocharge, P-2 was found more effective than P-1. It is estimated that 0.7 % of P-1 repeating units and 1.2 % of P-2 molecules contribute to toner charge, respectively.

Calculation of the surface coverage of P-2 on spherical silica particles shows that the efficient concentration region of charge agreed with the surface coverage. The P-2 concentration was 50 ppm based on toner. This means that the CCA molecule has great effect on tribocharge in small concentration.
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Document Type: Research Article

Publication date: 2010-01-01

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  • 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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