Designing Pigments for Optimal Performance in Chemical Toners

Type: White Papers
Product Line: Specialty Carbon Blacks

847.6 kb

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Abstract:

The emergence of chemical toners has, without question, enabled significant performance advancements in electrophotography.  Yet, the transition from conventional toner manufacturing processes to chemical toner manufacturing processes has made the incorporation of pigments into toner particles much more difficult.

In the conventional toner manufacturing process, high shear rates in the compounding step followed by a quick freezing of the compound allowed for relatively easy dispersion of pigments into the resin.  By contrast, liquid phase chemical toner processes generally provide less high-shear mechanical mixing, and the presence of multiple liquid phases presents opportunities for pigments to separate from the resin.

During NIP24, Cabot Corporation will present a paper outlining how surface modification of pigments can make them compatible with typical toner resins.  This improved compatibility can lead to improved pigment dispersion quality, simplified manufacturing processes, greater resin design freedom, and ultimately, improved toner performance – better image density and improved charging.

The paper outlines work on characterizing dispersion quality in styrene acrylic resins and polyester resins, two of the polymers most commonly used to produce electro-photographic toners.  This work demonstrates the impact that different surface chemistries can have on the compatibility between carbon black pigment and toner polymers.

 

You can also read the paper on "Treated Metal Oxide Additives for Toner Tribocharge Control".

 

 

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