| 摘要 |
PROBLEM TO BE SOLVED: To provide a resin particle having sharp particle-size distribution, which can eliminate defects due to sliding down or agglomeration of pigment, although the particles are pigmented only on the surface thereof.SOLUTION: The urethane resin particle (C) has irregularity on the particle surface, its shape factor SF2 is 120-240, the ratio of (90% particle size)/(10% particle size) is 2.0-3.0, and preferably its volume-average particle size is 1-700 μm. The particle (C) comprises a urethane resin (D), the urea group concentration of the urethane resin (D) is 0.5-10 wt.%; the sum of the urethane group concentration and the urea group concentration is 4-20 wt.%, its melting point is 160-260°C, and its glass transition temperature is -65°C to 0°C. |
