Patent ID: 8043782
Filing Date: 2011-10-25
Classification: G03G

Abstract:
1. A toner for electrophotography comprising a binder resin, a coloring agent, a charge controlling agent, and a releasing agent, wherein the toner has a D Log η*/DT absolute value of 0.02 or more, between a temperature of 40° C. lower than the fixing temperature of the toner and a temperature of 10° C. below the fixing temperature of the toner, and the toner has a D Log η*/DT absolute value of 0.005 or less between a temperature of 10° C. below the fixing temperature and a temperature of 10° C. or higher than the fixing temperature of the toner, where η* is the complex viscosity (η*) of the toner at a fixing temperature and an angular velocity of the fixing heat roller is in the range from 5.0×10 1 Pa·s to 1.0×10 2 Pa·s and where D is a differential and T is the temperature.