| 摘要 |
A color toner, comprises non-magnetic resin particles containing a coloring agent and two types of inorganic oxide particles, wherein; particles of coloring agent have an average particle diameter D of 300 m mu </=D</=800 m mu as determined by measurement of scattered-light intensity; coloring agent particles with a particle diameter of from (D-120) m mu to (D+120) m mu account for not less than 90% of the whole; coloring agent particles with a particle diameter of 169 m mu or less account for not more than 1.0%; and coloring agent particles with a particle diameter of 949 m mu or more account for not more than 0.5%; said color toner has a volume average diameter of from 6 to 10 mu m; colored resin particles with a particle diameter of 5 mu m or less are contained in a proportion of from 15 to 40% by number; colored resin particles with a particle diameter of from 12.7 to 16.0 mu m are contained in an amount of from 0.1 to 5.0% by volume; colored resin particles with a particle diameter of 16 mu m or more are contained in an amount of not more than 1.0% by volume; and colored resin particles with a particle diameter of from 6.35 to 10.1 mu m have a particle size distribution that satisfies the following expression: 9</=Vx &upbar& dv/N</=14 wherein V represent a volume percentage of colored resin particles with a diameter of from 6.35 to 10.1 mu m; N represents a number percentage of colored resin particles with a diameter of from 6.35 to 10.1 mu m; and &upbar& dv represents a volume average particle diameter of the whole colored resin particles; and said inorganic oxide particles comprise a hydrophobic inorganic oxide (A) having an absolute value of not less than 50 mu c/g for the amount of triboelectricity and a specific surface area SA of from 80 to 300 m2/g as measured by the BET method, contained in an amount of a% by weight based on the colored resin particles, and a hydrophilic inorganic oxide (B) having an absolute value of not more than 20 mu c/g for the amount of triboelectricity and a specific surface area SB of from 30 to 200 m2/g as measured by the BET method, contained in an amount of b% by weight based on the colored resin particles, where SA>/=SB, a>/=b, and 0.3</=a+b</=1.5.
|
