Patent ID: 7390605

Claim:
A resin binder for toner, comprising: a crystalline polyester having a softening point of 80° to 130° C., comprising a resin obtained by polycondensation of an alcohol component comprising 70% by mol or more of an aliphatic diol having 2 to 8 carbon atoms, and a carboxylic acid component comprising 70% by mol or more of an aromatic dicarboxylic acid compound; and an amorphous polyester-based resin, comprising a resin comprising a polyester component obtained by polycondensation of an alcohol component comprising 70% by mol or more of an alkylene oxide adduct of bisphenol A, represented by the formula (I): wherein R is an alkylene group having 2 or 3 carbon atoms; x and y are a positive number; and the sum of x and y is from 1 to 16, and a carboxylic acid component, wherein the weight ratio of the crystalline polyester to the amorphous polyester-based resin is from 5/95 to 50/50, and wherein the crystalline polyester has a number-average molecular weight of from 2000 to 10000, and a weight-average molecular weight of from 60000 to 1000000.