Patent ID: 8221949

Claim:
A toner comprising a resin binder comprising at least two types of polyesters having softening points that differ by 10° C. or more, a colorant and a charge control agent, wherein the at least two types of polyesters comprise a polyester A having a softening point of from 105° to 140° C. and a glass transition temperature of from 30° to 55° C., and a polyester B having a softening point of from 140° to 170° C. and a glass transition temperature of exceeding 55° C. and 80° C. or lower, (i) wherein the polyester A is a polyester obtained from a succinic acid substituted with an alkyl group having 1 to 20 carbon atoms or an alkenyl group having 2 to 20 carbon atoms, as a carboxylic acid component of a raw material monomer, and wherein an amount of the succinic acid substituted with an alkyl group having 1 to 20 carbon atoms or an alkenyl group having 2 to 20 carbon atoms in the polyester A is from 16 to 50% by mole based on the total amount of the raw material monomers in the polyester A in the resin binder, and (ii) wherein in all of the polyesters in the resin binder, the succinic acid substituted with an alkyl group having 1 to 20 carbon atoms or an alkenyl group having 2 to 20 carbon atoms is contained in an amount from 10.0 to 18.5% by mole based on the total amount of the raw material monomers in all of the polyesters in the resin binder.