Electrophotographic toner and method of preparing the same

摘要

An electrophotographic toner and a method of preparing the same, the electrophotographic toner including a binder that includes two kinds of resin having different weight average molecular weights, a colorant, and a releasing agent.

主权项

1. An electrophotographic toner comprising:
a binder comprising two resins having different weight average molecular weights; carbon black; and a releasing agent, wherein the electrophotographic toner has a molecular weight distribution curve measured by gas permeation chromatography (GPC), with a main peak in a region of from about 8.0×103 g/mol to about 4.0×104 g/mol and a shoulder starting point in a region greater than or equal to about 1.0×105 g/mol; the electrophotographic toner has a weight average molecular weight of from about 5.0×104 g/mol to about 4.0×105 g/mol and a Z-average molecular weight of from about 1.0×105 g/mol to about 6.0×106 g/mol; free carbon black in washer liquid of deionized water containing 1 wt % of the electrophotographic toner has an absorbance of about 0 to about 0.01 at 600 nm; and wherein the electrophotographic toner comprises iron (Fe) in an amount of from about 1.0×103 ppm to about 1.0×104 ppm, and silicon (Si) in an amount of from about 1.0×103 ppm to about 5.0×103 ppm.