| 摘要 |
PURPOSE:To impart superior flow performance, charge stability, and resistance to deterioration, and to alleviate staining of a copier, its abrasion, etc., by mixing a finely divided toner of mean particle diameter <= a specified value and a small amount of a finely divided silica coated with the base resin of said toner. CONSTITUTION:A toner is prepared by incorporating with a finely divided toner of mean particle diameter <=30mum, a silica powder coated with the base resin of this toner by 0.1-1wt% of the total wt.. The base resin used is polystyrene, a styrene- (meth)acrylate copolymer, or the like. 100pts.wt. silica powder is coated with 1- 10pts.wt. base resin. A silica powder of particle diameter <=5mum is used. Use of this toner prevents deterioration of a carrier and the toner, staining and abrasion of a copier and a developing unit, occurring in the case of using a conventional uncoated silica powder, and reduces deterioration of image quality even in the case of continuously adding a toner not used for development and recovered after development again to a fresh toner.
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