Patent ID: 8563207

Claim:
A toner binder comprising: a polyester resin (P) containing at least 10% by weight of a polyester resin (A) that has at least a carboxylic acid component (x) and a polyol component (y) as constituent units, the carboxylic acid component (x) containing 80% or more by mole in total of two or more dicarboxylic acids (x1) selected from the group consisting of aromatic dicarboxylic acids and ester-forming derivatives thereof, and also containing trivalent or more polycarboxylic acid (x2), and the polyol component (y) containing 80% or more by mole of an aliphatic diol (y1) having 2 to 10 carbon atoms, wherein the polyester resin (A) has a storage elastic modulus of 20000 dyn/cm 2 or more at 150° C., and a storage elastic modulus represented by a dyn/cm 2 unit at 150° C. which is represented by G′150 and that a storage elastic modulus represented by a dyn/cm 2 unit at 180° C. which is represented by G′180 satisfy the following formula (1): G′ 150 /G′ 180≦15 Formula (1).