| 摘要 |
<p>PURPOSE: To provide a toner by which excellent toner image transfer efficiency is provided, a remaining toner after a transfer is reduced, and a high quality image can be obtained. CONSTITUTION: In a toner consisting of toner grain, in which a coloring agent is dispersed in a binding resin at least, and inorganic fine powder, a liquid lubricant is contained, a toner shape factor SF-1 measured by a toner image analysis device is 110<SF-1<=180 while a shape factor SF-2 is 110<SF-2<=140, a ratio B/A of a value B found by subtracting 100 from the value of SF-2 to a value A found by subtracting 100 from the value of SF-1 is 1.0 or less, a relation ship between a toner specific surface area Sb (m<2> /cm<3> ), which is measured by a BET method, per a unit volume and a specific surface area St (m<2> /cm<3> ), which is found from a weight average grain diameter on the assumption that the toner is a right sphere, per a unit volume satisfies such conditions as 0<=Sb/St<=7.0 and Sb<=St×1.5+1.5.</p> |
