Patent ID: 7169855

Claim:
A method for producing a transparent polypropylene sheet comprising: a formation step of melting and extruding a resin composition comprising (A) 60 to 97 mass % of a polypropylene resin having an isotactic pentad proportion of 0.85 to 0.99 and a melt index of 2 to 10 g/10 min, and (B) 40 to 3 mass % of a polypropylene resin having a racemic pentad proportion [rrrr/(1-mmmm)] of 0.15 to 0.50 and a melt index of 2 to 10 g/10 min into a sheet-like body; a cooling step of quenching the extruded sheet-like body; and a heat treatment step of heat-treating the quenched sheet-like body at a temperature not lower than 70° C. and not higher than a melting point of the polypropylene resin.