Color toner
AssigneeCanon Kabushiki Kaisha
InventorsKazuhiko Hayami, Hirohide Tanikawa, Tetsuya Ida, Akira Hashimoto, Nozomu Komatsu, Hiroyuki Fujikawa
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Abstract
A color toner that comprises at least a binder resin, a colorant and a release agent, wherein the binder resin has at least a polyester unit and is synthesized in the presence of a tin compound as a catalyst represented by the general formula (1): (RCOO)2Sn (1) wherein, R is an alkyl group of 5 to 15 carbon atoms. The toner is excellent in charge build-up, resistance to high temperature offset, color reproducibility and transparency.
Claims5
A color toner comprising at least a binder resin, a colorant and a release agent, wherein the binder resin has at least a polyester unit and is synthesized in the presence of tin 2-ethylhexanoate as a catalyst,
- wherein said color toner has an average circularity of 0.922 to 0.955 for the particles having a circle-equivalent diameter of 3 μm or more and said color toner has one or more absorption peaks in a temperature range from 30 to 200° C. and the largest peak at from 60 to 130° C. in a heat absorption curve, established by differential scanning calorimetry (DSC),
- said color toner has a light transmittance from 10 to 70% in an aqueous solution containing methanol 45% by volume.
Dependencies are inferred from the claim text.