CPC C08F 110/06 (2013.01) | 13 Claims |
1. A method of producing polypropylene, the method comprising polymerizing propylene in the presence of a catalyst composition comprising a Ziegler-Natta catalyst, an external electron donor, dialkylaluminum hydride, and trialkylaluminum, wherein the polypropylene has a xylene cold soluble content of 3 wt % or less, and
wherein the polypropylene has, when an endothermic peak is measured using successive self-nucleation and annealing (SSA)-differential scanning calorimeter (DSC), a sum of a peak value (DH4) observed at 170° C. and a peak value (DH5) observed at 176° C. of 75% or more of a total peak.
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