| 摘要 |
PROBLEM TO BE SOLVED: To provide a toner having excellent storage stability or durable stability under a high temperature and high humidity environment and also having low-temperature fixability and hot off set resistance property.SOLUTION: A toner contains toner particles including: (1) a binder resin; (2) a coloring agent; (3) ester wax; (4) a monomer having a sulfonic acid group, a sulfonate group or a sulfonic acid ester group and a copolymer of a styrene monomer and an acrylic acid ester or a methacrylic acid ester. The binder resin is a styrene-acrylic resin. With regard to the sum of numbers of atoms of respective chemical elements of carbon atoms, oxygen atoms, nitrogen atoms and sulfur atoms obtained through a surface analysis of the toner particles by X-ray photoelectron spectroscopy (XPS), the sulfur atoms represent 0.05%-0.50% by number. When the toner particles are applied on an adhesive face of an adhesive tape, and the tape with the applied toner particles is pressed onto a glass and left under an environment of 30°C and 95% for 60 days, and thereafter removing the tape, a styrene-acrylic resin component amount remaining on the glass is set as (A), and an amount when left under an environment of 50°C and 95% for 2 days is set as (B), (A) and (B) satisfy: (A)≤0.30 mass%, and 0.25 mass%≤(B)≤0.60 mass%. |
