Patent ID: 7867681
Filing Date: 2011-01-11
Classification: G03G

Abstract:
1. An electrostatic image developing toner comprising a colorant, a releasing agent, and a binder resin containing an amorphous polyester resin and a crystalline polyester resin, the amorphous polyester resin containing a component derived from n-dodecenylsuccinic acid and a tin-containing catalyst, and the crystalline polyester resin containing a titanium-containing catalyst, wherein a content of amorphous polyester resin in the binder resin is in a range of from about 86 to about 98% by weight, acid values of the amorphous polyester resin and the crystalline polyester resin are in a range of from greater than 7 mgKOH/g to less than 25 mgKOH/g, the acid value of the amorphous polyester resin being greater than the acid value of the crystalline polyester resin, and the electrostatic image developing toner is produced by forming aggregate particles by aggregation of particles of the amorphous polyester resin, particles of the crystalline polyester resin, particles of the colorant and particles of the releasing agent, and further adhering addition particles to the aggregate particles, the addition particles comprising the amorphous polyester resin.