| 摘要 |
<p>A toner in which the desired functions of external additives (functions of imparting charge stability, flowability, etc. to the toner) can be maintained even when the toner is used in a severe environment such as a high-temperature high-humidity (H/H) environment, and which has satisfactory quick-electrification characteristics and long-term stability with respect to electrification characteristics and flowability. Even when used to conduct continuous printing on a large number of sheets, the toner retains the ability to reproduce thin lines, is less apt to cause deterioration of image quality attributable to blurring, etc., and has excellent long-term printing performance. The toner for electrostatic-image development comprises color resin particles comprising a binder resin and a colorant and external additives, and is characterized in that the external additives comprise an external additive (A) and an external additive (B), the external additive (A) is particles of a fatty acid metal salt, the content of the particles of a fatty acid metal salt being 0.01-0.5 parts by weight per 100 parts by weight of the color resin particles, and the external additive (B) is fine spherical colloidal silica particles having a number-average primary-particle diameter of 30-80 nm, the surface of which has been treated with a silane compound having a C8-20 alkyl group, the content of the fine spherical colloidal silica particles being 0.3-2.0 parts by weight per 100 parts by weight of the color resin particles.</p> |
