Abstract
Charge control capability of trianilino-triphenylmethane (TATPM: a positive type CCA) for a styrene-acryl (St-Ac) model toner is evaluated using two types of two-component developer samples. One of the samples is a mixture of St-Ac model toner TP which has a TATPM coating layer on its surface and a ferrite carrier C, and the other is a mixture of CCA-free St-Ac model toner T and a ferrite carrier CP which has a TATPM coating layer on its surface. The toner charge q/m of the developers having TP-C and T-CP combinations is measured by the blow-off method. Both of toner brown off from the developer of the TP-C combination and that from the developer of the T-CP combination show a positive charge. The positive charge on the toner T from the developer of the T-CP combination, (that is, the toner first brought in contact with and then separated from the carrier) CP having a strongly positive charge, is contrary to expectation. The values of the toner charge q/m for the developers are nearly equal if the amount of TATPM on the TP surface or on the CP surface is identical. The q/m values increase linearly with an increase in the amount of TATPM coated on the two surfaces and reach a saturation value. On the surface of a carrier CS, which was collected after the blowoff measurements of the developer of the TP-C combination, a small amount of TATPM was detected by a calorimetric method.From the above results, it is confirmed that, in the toner charging of the two component developer of the TP-C or T-CP combination, the TATPM particles from the TATPM coating layer of the TP or CP surface served as a positive charge messenger according to the following steps; a) the TATPM layer coated on the TP surface or CP surface is peeled off by a mixing operation, b) the generated TATPM fine particles adhere on the carrier C or carrier CP surface and acquire a positive charge, c) the positively charged TATPM particles adhere to the toner T or toner TP surface to provide positively charged toner particles.
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