Patent ID: 8057978

Claim:
An electrophotographic toner comprising a resin and a colorant, wherein the resin comprises resin A and resin B; the resin B is a copolymer of monomers comprising a vinyl monomer and a polycarboxylic acid selected from the group consisting of itaconic acid, maleic acid, fumaric acid, glutaconic acid, citraconic acid and mesaconic acid; the resin B has a glass transition temperature higher than that of the resin A; an amount of the resin B is 3 to 30% by mass of total resins of the toner; and the toner meets requirements that Gâ€² (60)/Gâ€² (80) is 1Ã—10 2 to 1Ã—10 4 , wherein Gâ€² (60) and Gâ€² (80) are each a storage modulus of the toner at 60Â° C. and 80Â° C., respectively; Gâ€² (100)/Gâ€² (130) is 1 to 10 2 , wherein Gâ€² (100) and Gâ€² (130) are each a storage modulus of the toner at 100Â° C. and 130Â° C., respectively; and Gâ€² (100-130) is 1Ã—10 2 to 1Ã—10 5 dyn/cm 2 , wherein Gâ€² (100-130) is a storage modulus of the toner at temperature of 100 to 130Â° C.