| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a toner containing a resin and a coloring agent and to obtain a toner having excellent transfer property and fluidity and good electrification property and cleaning property by specifying the shape coefft., electric resistance and specific surface ratio of the toner. SOLUTION: This electrophotographic toner contains at least a resin and a coloring agent and has 105 to 140 of toner shape coefft. SF1, 9 to 11 of electric resistance log R and 1.1 to 3 of specific surface area ratio S1/S2. The shape coefft. SF1 is defined by SF1= (max. length)<2> /area}×π×4×100, wherein the area means the average projection area of the powder and the max. length is the average max. length in the projected image of the powder. S1 is a specific surface area (m<2> /g) measured by BET method, S2 is a calculated specific surface area (m<2> /g). The amt. of the coloring agent in the electrophotographic toner is preferably >=8wt.%.</p> |
