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New Composite-Carrier for Electrophotographic Developers

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Abstract:

A new composite-carrier based on magnetic particles and phenol resin has been developed for long-life electrophotographic developers. The present carrier, composed of core particles and a resin shell, is quite spherical in shape and is characterized by a narrow particle-size distribution (controllable range: 10-200 μm in diameter). The carrier core can either be made up of magnetic fine particles such as ferrites and magnetites, or of non-magnetic particles such as hematites. The content of the core particles can be as high as 90 wt%. The core particles were prepared by dispersing magnetic or non-magnetic fine particles in an aqueous solution of phenol and formaldehyde using ammonium as an initiator. The surface of the core particles was then coated with silicone resin. The composite-carrier thus prepared exhibits an excellent performance in charging and charge-holding properties that greatly exceeds the characteristics of commercial ferrite-carriers.

Document Type: Research Article

Publication date: January 1, 2000

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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