Surface Modified Pigments for Improved Color in Chemically Prepared Toners

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Abstract:

In the field of electrophotographic printing, the emergence of next-generation printing technologies such as chemically prepared toners (CPT) is changing pigment performance requirements. In conventional toner manufacturing, high shear rates during compounding of the resin and pigment, followed by rapid solidification are necessary to ensure uniform dispersion. In contrast, most chemical toner processes do not rely on mechanical mixing to achieve good pigment dispersion in the toner. CPT processing occurs in the presence of multiple liquid phases. Under these conditions pigments can easily be separated from the resin. Without the benefit of high shear mixing and in the diverse environment of a multi-component CPT system, pigments must now balance ease of dispersibility with resin compatibility. Improving compatibility with the main components of a chemical toner allows the pigments to disperse and to remain dispersed throughout the entire CPT process (processes such as emulsion aggregation and direct polymerization). In response to these challenges, Cabot has developed several surface modification technologies that enable dispersions of pigments in chemical toner systems. In this paper, we will discuss how the improved dispersibility, compatibility, and processability of Cabot's modified pigments in toner resin dramatically improve the resulting color performance. Through proper design of the pigment surface, these benefits can be realized in any one of the well known chemical toner processes.

Document Type: Research Article

Publication date: January 1, 2009

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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