The poor dispersion of carbon black plagued many black masterbatch manufacturers because the dispersion is poor when using a single or twin screw extruder to produce high load black masterbatch. When the end user mixes these black masterbatch or molds with these black masterbatch, its performance is only slightly better than carbon black, but the effect is equally unsatisfactory. In order to achieve a stable high degree of dispersion, a high level of shearing kneader must be used to mix carbon black, such as a mixture of FCM or BANBURY. With sufficient strength, these mixers allow the carbon black and base resin to be thoroughly mixed together, and the type of carbon black used also affects the coloring dispersibility. The smaller the carbon black particles, the more difficult the dispersion is.