Patent ID: 8652724

Claim:
A toner for developing electrostatic images, comprising a binder resin, a colorant, a release agent, a charge control agent, and a retention aid, wherein the retention aid is a copolymer of 70 to 98% by weight styrene and 2 to 30% by weight (meth)alkyl acrylate, and the copolymer has a glass transition temperature of 5 to 60° C., wherein an added amount of the retention aid is in the range from 1 to 15 parts by weight with respect to 100 parts by weight of the binder resin, wherein the retention aid has a weight average molecular weight (Mw) of 3,000 to 10,000 and a molecular weight distribution (Mw/Mn) of 1.0 to 2.0, which is a ratio of weight average molecular weight (Mw) to number average molecular weight (Mn).