Patent ID: 8679714

Claim:
A toner comprising: a first binder resin; a colorant; a releasing agent; and a crystalline organic compound, wherein the first binder resin contains an amorphous polyester resin (a) having a polyhydroxycarboxylic acid skeleton derived from optically active monomers in a part of a main chain of the amorphous polyester resin, and the polyhydroxycarboxylic acid skeleton has an optical purity X, calculated on the monomer basis, of 80% or less, and the optical purity X is determined from the following equation, Optical Purity X (%)=| X ( L -form)− X ( D -form)| where X (L-form) represents, calculated on the monomer basis, an L-form ratio (mol %), and X (D-form) represents, calculated on the monomer basis, a D-form ratio (mol %), and wherein the crystalline organic compound is a crystalline low molecular compound which has a melting point of 60° C. to 100° C., and is a member selected from the group consisting of fatty acids having 16 to 24 carbon atoms, alcohols having 16 to 24 carbon atoms, fatty acid ester compounds, and aliphatic carboxylic acid amides; wherein the toner satisfies the following formula (2): 0≦( Q 2 /Q 1)≦0.30 Formula (2) where Q 1 is an endotherm of a melting peak derived from the crystalline organic compound when a temperature of the toner is increased from 20° C. to 150° C. at a temperature increasing rate of 10° C./min (first temperature increase), and Q 2 is an endotherm of a melting peak derived from the crystalline organic compound when, after the first temperature increase, the temperature is dropped to 0° C. at a temperature decreasing rate of 10° C./min, followed by increasing to 150° C. at a temperature increasing rate of 10° C./min (second temperature increase), in DSC measurement of the toner.