| 摘要 |
<p>PURPOSE:To obtain the toner, which can obtain the stabilized high image quality without lowering the charge quantity and the flowability even in the case where the number of copy is increased, at a low cost. CONSTITUTION:Silica fine-grain and the low surface energy organic grain, which has a mean primary grain diameter larger than that of the silica fine- grain and of which glass transition point Tg[ deg.C] exists in a range of 30<=Tg<=150 and of which critical surface tension gammac [dyn/cm] at 20 deg.C exists in a range of gammac<=30, are added to the surface of the toner grain.</p> |
