HIGHLY CRYSTALLINE POLYPROPYLENE

摘要

A highly crystalline polypropylene having a degree of crystallinity of at least 50.5% calculated from the heat of melting; and a relationship between a proportion f(R)of R-lamella with respect to spherulites and a weight-average molecular weight Mw which satisfies the following Formula (II). The above-mentioned proportion f(R) of R-lamella spherulites is calculated using the following Formula (I) from the birefringence DELTA n of crystallized spherulites obtained by melting said highly crystalline polypropylene at 230 DEG C for 5 minutes, cooling to a temperature of 132 DEG C at a cooling rate of 20 DEG C/minute, and then maintaining said temperature for 90 minutes. Molded articles obtained using the above-mentioned highly crystalline polypropylene or a resin composition containing the above-mentioned highly crystalline polypropylene resin are superior in rigidity, heat resistance, scratch resistance, dimensional stability, and low production of odor during molding, and can be widely used in various applications. $$ $ \mathop{\mathrm{image}}$$$