PRE-EXPANDED POLYPROPYLENE RESIN PARTICLES, IN-MOLD FOAM MOLDED BODY OF POLYPROPYLENE RESIN, AND METHOD FOR MANUFACTURING SAME

摘要

Provided are pre-expanded polypropylene resin particles having a dimensional expansion coefficient of 1.5% or more determined with a thermomechanical analyzer at a constant compressive load of 1 mg during heating from 30°C to 100°C at a temperature increase rate of 10°C/min. Using the pre-expanded polypropylene resin particles can yield an in-mold foam molded product of polypropylene resin having few wrinkles and small dimensional shrinkage without pretreatment such as internal pressure application or compression packing during packing the pre-expanded particles in a mold for in-mold foam molding.