| 摘要 |
PROBLEM TO BE SOLVED: To obtain a composition effective in reducing the change of hue and color shading by compounding a dispersion composed of carbon black as a pigment and a propylene homopolymer or a propylene/ethylene random copolymer, a pigment and a carrier resin as a pigment dispersant. SOLUTION: A dispersion is composed of 1-50 wt.% of carbon black, as a black pigment, having an average particle size of at least 20μm and 50-99 wt.% of a propylene homopolymer or a propylene/ethylene copolymer as a pigment dispersant. A pellet-like colorant comprises this dispersion, 1-60 wt.% of a pigment component, 40-99 wt.% of a polypropylene resin as a carrier resin, and if required, a low molecular weight dispersant such as an ethylene wax or the like or a lubricant such as a metal salt of a fatty acid or the like. With 100 pts.wt. of a diluting resin are admixed 1-20 pts.wt. of the pellet-like colorant, and if required, an antistat, an ultraviolet absorber, a light stabilizer and the like, and the resultant mixture is molded to give a product.
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