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Charging Characteristics of Electron Donor-Acceptor Complexes formed by Combination of Positive and Negative Charge Control Agents

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The charging characteristics of charge control agent (CCA)/binder-resin matrix films containing a combination of a positive and a negative charge control agents were investigated by measuring the amount of tribo-charges. Tri-phenylated-para-rosaniline (TPPR) was used for the positive type CCA and 3,5-tert-butylsalicylate (TBS), 3,5-tert-bytylsalicylate zinc complex (SZC) and n-propyl gallate (PG) were used for the negative type CCA. The CCAs are dissolved in a styrene-acryl resin-binder solution and coated on a stainless steel plate to prepare the CCA/binder-resin matrix films. Ferrite powders were cascaded onto the matrix film surface and the generated cascade charge was measured.

The results show that TPPR (positive type CCA) forms an electron donor/acceptor complex with the negative type CCAs, and the amount of the positive charge increases by adding an increasing amount of negative type CCAs. The formation of the complex was confirmed by increasing light absorbance at 600 nm by adding an increasing amount of negative type CCAs to the resin-binder solution containing TPPR. The factors that affect the charge control capability of the CCA in determining the amount of the tribo-charge on toner particle are discussed from the viewpoint of electron donor/acceptor interactions between CCAs and other components in the toner formulation.

Document Type: Research Article

Publication date: 2002-01-01

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