熱可塑性樹脂粉体 : 帯電制御剤の複合化とその評価

概要

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In order to desing the toner particles of thermoplstic resin coated with charge control agents (CCA), a dry coating method was applied to its compounding process. Experiments were carried out with a high speed-high shear mill by changing oeperation time. the compound states of the particles obtained were evaluated by EPMA mapping analysis and other methods. Then a relation between the compound state and triboelectric charging was studied by investigating the variation of spscific charge (charge-to-mass ratio) with the mixing time of composite particles and carrier. The results obtained are summarized as follows. The whole coating process can be divided into three regions. The variation of specific charge shows that the CCA-Coating fraction on the surface of core material influences both the maximum specific charge and the charging speed. A good correlation was recognized between the binding strength of CCA and the charge stability. Based on these facts, it is possible to design the CCA-coated thermoplastic resin particles which have more excellent tribo-electric charging characteristics than the conventional particles obtained by kneeding and pulverizing.
1993-06-15