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The Effect of Surface Modified Fumed Metallic Oxide Additives on the Performance of Toners

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A wide variety of surface modified fumed metallic oxides has been proposed and successfully applied as toner additives for improvement of such characteristics as free-flow properties, tribo-electrostatic charge (ESC) level, and charge stability at the activation time and ambient variations. When the Selenium (Se) was mainly used as image drum component, dimethylsilyl treated fumed silica with negative charge was an effective additive. According to the introduction of the new technologies, such as Organic Photo Conductor (OPC) or amorphous silicon (a-Si) drum, the requirements for the toner, and hence for the toner additives have diversified extensively. The type of polymer for toner, e.g. polystyrene-acrylic type or polyester type, and the type of the machine, e.g. monochrome, color or multifunctional unit, also helped diversification of such requirements. To meet with the specific requirement in the respective system, the various surface modified fumed oxides, ranging from positive charged to negative charged, from high BET surface fine particles to low BET coarse particles, for example, have been developed. This paper describes the typical proposed material designed to suit for the respective system, with the physicochemical data, and then discusses the effect of the types of surface treatment reagents on the performance of the toner.

Document Type: Research Article

Publication date: January 1, 2000

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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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