To apply polyester resin to positively chargeable toner, the relation between the acid value of its resin and toner charge, and also dispersion of charge control agent in low acid polyester resin were investigated. The mixing condition of polyester resin and charge control agent was also investigated for the most suitable positively chargeable toner. It was found CCA should be dispersed as certain aggregates, to get higher charging-up speed and the charge stability. That means low acid value of polyester does not always mean disadvantages, and we could make positively chargeable polyester toner with high durability, and low energy fusing.
Hidenori Tachi, Shinichi Sata, Shinji Moriyama, "Study on Positively Chargeable Polyester Toner" in Proc. IS&T Int'l Conf. on Digital Printing Technologies (NIP15), 1999, pp 549 - 552, https://doi.org/10.2352/ISSN.2169-4451.1999.15.1.art00043_2