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Preparation of Toner Particles with Micro-serrated Texture by Chemical Milling

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Recently various dispersion polymerization methods have emerged as an economical alternative for producing small sized toners and thus improving the resolution of electrophotography (EP) images. The polymerized toners generally have a small particle size, a narrow size distribution and a spherical shape with a smooth surface. However, the methods present several difficulties such as process and equipment complexity, potential for solvent contamination of toner particles, inflexibility of formulation variation and slow charging characteristics.

We developed a novel chemical milling method of producing small toner particles, which has the advantages of the polymerization methods but are free of the abovementioned disadvantages. The spherical toner particles produced by the chemical milling method may have the mean diameter any value in the range of 3-15 μm with a simple adjustment of the process parameters. The particles generally have a narrow size distribution with the span (= (d90-d10)/d50) as low as 0.6. Furthermore, the particle surface morphology may be controlled to have a rough texture, which significantly improves the charging characteristics of the particles. The process is applicable for a wide range of binder resins, including commercial styrene/acrylic and polyester resins. Physical properties of the chemically milled toners as well as their EP performance are presented.

Document Type: Research Article

Publication date: January 1, 2001

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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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