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The Chemistry of Toner Polymers

November 1, 2008 - page(s): 57-63
Various low molecular weight (LMW) polyolefins have been widely used in conventional imaging toner to provide a low energy surface, abrasion and scratch resistance, and release properties. LMW polyethylene wax is a nonfunctionalized wax that is a key additive in digital processes such as electrophotographic, thermal and inkjet printing. Polyethylene release wax (hereafter referred to as release wax) provides release and lubrication, while also improving image sharpness.

Despite the vital role it plays, the dispersion of release wax in polar toner resins remains a challenge. Baker Petrolite, a Baker Hughes company, evaluated the effect of combining specialty performance LMW polymers (hereafter referred to as specialty polymers) with release wax to enhance compatibility with polar toner resins. The compatibility was assessed in both polyester and styrene acrylic resins by using a scanning electron microscope (SEM), light microscope and differential scanning calorimetry (DSC).

Background

Xerographic printing is a process that generates and develops electrostatic toner images onto recording media, typically by the process of hot-roll fusing. Toners are used to produce the printed images. A typical toner consists of resins, colorants, charge-control agents, and functional additives.

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This article will be available online on 05/01/2009

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