| 摘要 |
PROBLEM TO BE SOLVED: To provide a composite particle having high adhesion strength of fine particles to core particles, and capable of securing excellent charge amount and high fluidity.SOLUTION: The composite particles comprises core particles and fine particles. The principal component of the core particle is one of an organic material and an inorganic material. The fine particles are present on the core particles, and the principal component of the fine particle is the other of the organic material and the inorganic material. The average particle size of the core particles is 80-300 nm, and the coefficient of variation of average particle size is 2-10%. The average particle size of fine particle is 5-30 nm, and the average particle size of the fine particle/the average particle size of the core particle is 0.016-0.25. The composite particle has: an average particle size of 90-350 nm. In the composite particle; a ratio β/βof multipliers in a volume resistance (α×10) and a surface resistance (α×10) is 0.7-1.4; and the number variation of the fine particle existing on the core particle is 0.5 to 5% before and after irradiating a dispersion using water as a dispersion medium and including composite particles of 1 wt.% with an ultrasonic wave having an output of 110 W and a frequency of 31 kHz for 30 minutes.SELECTED DRAWING: Figure 1 |
