Patent ID: 10209640

Abstract:
Cores of toner particles contain a non-crystalline polyester resin, a carnauba wax, and a crystalline polyester resin (polymer of monomers including alcohol, carboxylic acid, styrene-based monomer, and acrylic acid-based monomer) having an SP value ((cal/cm3)1/2) of at least 10 and no greater than 11. Shell layers each include a resin film mainly constituted by a complex of resin particles having a glass transition point of at least 50° C. and no greater than 100° C. A Ru-dyed ratio of the toner particles in a state in which no external additive is present is at least 50% and no greater than 80%. An intensity of an absorbency peak around a wavenumber of 701 cm−1 is at least 0.0100 and no greater than 0.0250. Surface adsorption forces (FA: coated regions, FB: exposed regions) satisfy “0 nN<FA”, “50 nN≤FB≤70 nN”, and “35 nN≤FB−FA≤65 nN”.