INJECTION MOLDING METHOD, INJECTION-MOLDED MOLDING, AND MASTER BATCH

摘要

PROBLEM TO BE SOLVED: To provide an injection molding method which can disperse a master batch well while curtailing a molding cycle and obtain an injection-molded molding without color nonuniformity, the injection-molded molding molded by the method, and the master batch used in the method. SOLUTION: The master batch 150-160 deg.C in melting point and 260 poise or below in melt viscosity at 220-240 deg.C is added to a polypropylene resin, and the mixture is injection-molded with the use of an injection molding machine having a double flight screw.