| 摘要 |
<p>This invention provides a positively chargeable toner for electrostatic charge image development which can also be used with a toner supply-type image forming apparatus and, in the supply of a toner, can realize no significant fogging and imparting of temporally stable electrification properties and fluidity to toner particles, and, even in continuous printing of a number of sheets, can realize an excellent hairline reproducibility in a print, and, even under a high-temperature and high-humidity environment, is less likely to cause a deterioration in image quality due to fogging or the like and can realize excellent print durability. The positively chargeable toner for electrostatic charge image development comprises a binder resin, colorant-containing colored resin particles, and an external additive. The external additive contains fine particles of spherical colloidal silica having a number average primary particle diameter of 30 to 80 nm and a triboelectrification amount of -50 to +300 µC/g, and fine particles of fumed silica having a number average primary particle diameter of 5 to 25 nm. The content of the fine particles of spherical colloidal silica and the content of the fine particles of fumed silica are 0.3 to 2 parts by weight and 0.1 to 1 part by weight, respectively, based on 100 parts by weight of the colored resin particles.</p> |
