Patent ID: 8460845
Filing Date: 2013-06-11
Classification: G03G

Abstract:
1. A cyan toner comprising toner particles each of which has a toner base particle (A) and a surface layer (B) formed on the toner base particle (A), wherein: the toner base particle (A) comprises at least a resin (a), a cyan colorant and a wax, the resin (a) having a polyester as a main component; the surface layer (B) comprises a resin (b) as a main component, the resin (b) being a polyurethane including a carboxylic acid group, a sulfonic acid group, a carboxylate, or a sulfanate in a side chain thereof; the cyan toner satisfies the following formulas (1) and (2) in DSC measurement: where Tg(0.5) is a glass transition temperature (° C.) obtained at a rate of temperature increase of 0.5° C./min, and Tg(4.0) is a glass transition temperature (° C.) obtained at a rate of temperature increase of 4.0° C./min; when the concentration of the cyan toner in an ethyl acetate dispersion is Cc when the concentration of the cyan toner in a chloroform solution is Cc