Method for producing polypropylene-based resin colored foam particles, polypropylene-based resin-colored foam particles, and polypropylene-based resin-colored foam particle molded article

摘要

PROBLEM TO BE SOLVED: To obtain chromatic foam particles which are brightly colored and have suppressed color unevenness, which can be easily obtained by in-mold molding. According to the method for producing colored foam particles of a polypropylene resin of the present invention, colored resin particles are produced by melt-kneading a colored masterbatch containing a chromatic pigment, a bubble conditioner, and a polypropylene resin. However, it is a method of producing colored foam particles by foaming colored resin particles by a so-called dispersion medium release foaming method, in which the concentration of the chromatic pigment in the colored masterbatch is a specific amount and the colored masterbatch. The ratio of the melt flow rate (II) of the above to the melt flow rate (I) of the polypropylene resin (A) is within a specific range. [Selection diagram] None