Patent ID: 8039188

Claim:
An electrostatic image developing toner comprising a binder resin; and a colorant, and satisfying following conditions (1) and (2): 0.02 ≦C A /C B ≦0.20 (1) 1 ≦Nt/St≦ 15 (2) wherein C A represents an amount of a carboxyl group and its salt on a surface of the toner, C B represents an amount of a carboxyl group and its salt in the entire toner, Nt represents an amount of a nitrogen element on the surface of the toner, and St represents an amount of a sulfur element on the surface of the toner, and wherein the binder resin comprises: a unit derived from a nitrogen-containing aromatic polymerizable monomer; and a unit derived from a nitrogen-containing aliphatic polymerizable monomer.