Charge Stabilization of Trimellitic Anhydride Microcapsule Toner1)

Katsuya TESHIMA*, Makoto AOYAGI and Shin-ichi HIKOSAKA

Research & Development Center, Dai Nippon Printing Co., Ltd.; 250-1 Wakashiba, Kashiwa-shi 277-0871 Japan

Trimellitic anhydride (TMA) microcapsule toners, used as foaming control agent in the field of printing, have been synthesized by liquid phase separation which is a kind of the coacervation method. Liquid phase separation is most promising for the microencapsulation of TMA, since it can create TMA microcapsules without using an aqueous solution. In the previous paper2), we explained that the instability of TMA toner charge results in the reaction between TMA and charge control agent (CCA). In this study, in order to restrain the reaction, neutral calcium petronate was used as CCA. Additionally, the microcapsule wall was multilayered by liquid phase separation. The liquid toner prepared by this study was able to be used for a commercial printing machine. Furthermore, the foaming restraint effects satisfied the industrial requirements in the field of printing.

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