| 摘要 |
PURPOSE:To obtain uniform chargeability characteristics and good potential stability by uniformly dispersing a colorant made of agglomerates of a specified carbon black into a binder resin. CONSTITUTION:The colorant composed of the agglomerates 2 of the carbon black having an average particle diameter of 0.05-0.5mum is uniformly dispersed into the binder resin 3. If the colorant contains the small agglomerates 2 near in diameter to the primary particles 1 of the carbon black or the large agglomerates near to the toner particles, sufficient volume resistivity cannot be obtained. It is controlled to regulate 70% of the agglomerates 2 in the number distribution in the range of x+ or -5xmum, where x is the average particle diameter of the agglomerates 2, thus permitting a uniform and narrow distribution of charge and superior potential stability to be obtained. |
