Patent ID: 9052623
Filing Date: 2015-06-09
Classification: G03G

Abstract:
1. A toner binder comprising a polyester resin (A) comprising at least a carboxylic acid component (x) and a polyol component (y) as constituent units, the carboxylic acid component (x) containing 80% by mol or more in total of two or more dicarboxylic acids (x1) selected from among aromatic dicarboxylic acids and ester-forming derivatives thereof, and also containing at least a polycarboxylic acid having three or more carboxyl groups (x2), and the polyol component (y) containing 50% by mol or more of an aliphatic diol (y1) having 2 to 10 carbon atoms, wherein the polyester resin (A) has a storage modulus at 150° C. [G′(150)] of 2000 Pa or more, and [G′(150)] and a storage modulus at 180° C. [G′(180)] satisfy the formula (1) given below; a crystalline resin (B) that has a maximum peak temperature [Tb] of heat of melting of 40 to 100° C., a ratio [Tm/Tb] of a softening point [Tm] to [Tb] of 0.8 to 1.55, and a melt initiation temperature [X] being within the temperature range of (Tb±30)° C., wherein a storage modulus G′(Tb+20) at (Tb +20)° C. as well as a loss modulus G″(X+20) at (X+20)° C. and a loss modulus G″(X) at X° C. each satisfy Condition 1 and Condition 2 defined below; and, if necessary, a noncrystalline linear polyester resin (C):