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Effect of Negative Externally-Added CCA Particles on Toner Charge

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Particles of externally-additive-charge-control-agent (EA-CCA) were prepared by means of coacervation process and their effects on toner charge were investigated. EA-CCA particles comprised with metal oxide core particles of 110nm diameter and CCA molecules adhered on the core surface. Four kinds of negative charge control agent (CCA), which were boron complex (N-1), zinc complex (N-2), iron complex (N-3) and styrene-acrylate copolymer with sulfonic acid (N-4), were applied to EA-CCA, respectively. Tribo-charge of the mixture of model toner and EA-CCA was measured in the CCA concentration range up to 1,000ppm against model toner by using blow off method. In both N-2 and N-4 added systems, tribo-charges were increased with increasing CCA concentration up to 1000ppm, in the range of these experiments. In other two CCA added systems, maximum region appeared in tribo-charge around 50ppm of CCA concentration. Relationships between tribo-charge and CCA concentration in all CCA show linear in smaller CCA concentration range, less than 20ppm. The former two kinds of CCA added system have slope value of one fifth smaller than latter two kinds of CCA system. It means that efficiency of CCA molecules was different among CCAs on tribo-charge. The difference considered to be dissociation energy and/or interaction between each CCA molecule on the core surface.
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Document Type: Research Article

Publication date: 2011-01-01

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