Patent ID: 7250241

Claim:
A toner comprising: toner particles, each said toner particle comprising a binder resin and a crystalline ester wax having, in a DSC curve obtained by measuring the toner with a differential scanning calorimeter, a glass transition temperature (Tg 1 ) measured in a first scan of 50.0 to 70.0° C. and a temperature difference (Tg 1 −Tg 2 ) of 3.0 to 20.0° C. between the glass transition temperature (Tg 1 ) measured in the first scan and a glass transition temperature (Tg 2 ) measured in a second scan, wherein said Tg 1 and Tg 2 are measured by conducting, in sequence, the following steps (i) to (iv): (i) maintaining the toner at 10° C. for one minute, (ii) measuring Tg 1 of the maintained toner with the differential scanning calorimeter by a mid-point method in the first scan from 10° C. to 160° C. at a rate of temperature rise of 1° C./minute, (iii) cooling the measured toner in the first scan, from 160° C. to 10° C. at a cooling rate of 2° C./minute and maintaining the cooled toner at 10° C. for 10 minutes, and (iv) measuring the Tg 2 of the cooled toner with the differential scanning calorimeter by a midpoint method on the second scan from 10° C. to 160° C. at a rate of temperature rise of 1° C./minute; and wherein the toner comprises a resin component of a molecular weight of 2,000 to 5,000 in an amount of 1.5 to 20.0% by weight based on the total weight of the toner.