POLYPROPYLENE MOLDING AND PREPARATION OF ITS BASE RESIN

摘要

PROBLEM TO BE SOLVED: To prepare a crystalline polypropylene molding having higher heat resistance (HDT; deg.C) than expected from its m.p. (Tm; deg.C), and its base crystalline polypropylene. SOLUTION: Polypropylene molded item satisfying the following relationship between heat deflection temp (HDT; deg.C) and m.p. (Tm; deg.C), 5.7<=1.18×(Tm)-(HDT)<=6.9 is obtd. by molding the following crystalline polypropylene. The crystalline polypropylene is obtd. by polymerizing propylene itself or by copolymerizing propylene and a 2-12Cα-olefin except propylene with a metallocene, selected from hafnocene, zirconocene or titanocene and aluminoxanes as catalysts.