| 摘要 |
PURPOSE:To obtain a positively triboelectrifiable toner independent of toner/carrier ratio and change of the total developer amt., superior in durability, such as successive use characteristics, and stable against environmental change, such as from high temp. and high humidity to low temp. and low humidity, by incorporating a specified pigment obtained by converting a dye into a lake in a binder resin. CONSTITUTION:A lake pigment represented by the formula (R1, R2, R4, R5 are each independently H, OH, or lower alkyl optionally substd. by alkoxy, R3, R6, R7 are each independently H, OH, phenyl or lower alkyl both optionally substd. by alkoxy, and A<-> is an anion), can be incorporated in a toner binder resin, such as polystyrene or styrene-butadiene copolymer, by adding it in the inside of a developer or to its outside, and in the former method, an amt. of lake pigment to be added is 0.1-50pts.wt. per 100pts.wt. of the resin, and in the case of outside addition, 0.01-40pts.wt. per 100pts.wt. of the resin. As a colorant, carbon black, dyes, and pigments can be used for this toner, and when needed, a fluidity improver, such as silica or alumina are added. |
