METHOD FOR PRODUCING POLYPROPYLENE MATERIAL, AND POLYPROPYLENE MATERIAL

摘要

Provided is a method for producing a polypropylene material, which can improve the heat resistance of the polypropylene material. The method for producing a polypropylene material comprises: a melting step of melting a polypropylene material rolled in at least one direction, at a temperature that is higher than Tm + 5°C where Tm is a melting peak temperature of the polypropylene material not rolled yet as measured by differential scanning calorimetry, and is equal to or lower than Tm + 60°C; and a heat treatment step of heat-treating the polypropylene material melted in the melting step, at a temperature that is equal to or higher than Tm - 20°C, and is lower than Tm - 10°C.