| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a negative charge toner excellent in environmental stability and flowability, not causing the sticking of a toner component to a photoreceptor, voids in a solid image and fog after printing even at the time of repetitive use and giving a superior image. SOLUTION: Negative charge toner particles are mixed with at least three kinds of additives to obtain the objective negative charge toner. The additives are 1st inorg. fine particles having 10-30nm number average particle diameter, 2nd inorg. fine particles having 10-90nm number average particle diameter and 3rd inorg. fine particles having 100-1,000nm number average particle diameter. The quantity of electric charges of the 1st inorg. fine particles by blow-off charge is -2,000 to -500μC/g, that of the 2nd inorg. fine particles is -300 to +50μC/g and that of the 3rd inorg. fine particles is -10 to +100μC/g.</p> |
