Patent ID: 7465776
Filing Date: 2008-12-16
Classification: C08F

Abstract:
1. A composition comprising: a propylene homopolymer produced in a bulk polymerization process in the presence of a Ziegler-Natta catalyst containing a combination of two internal donors comprising a phthalate and one of a diether or a succinate, and an external donor selected from the group consisting of cyclohexylmethyldimethoxysilane, cyclohexylethyldimethoxysilane, diphenyldimethoxysilane, phenyltriethoxysilane, 3,3,3-trifluoropropylmethyldimethoxysilane, diisopropyldimethoxysilane, octylmethyldimethoxysilane, isobutyltrimethoxysilane, isobutyltriethoxysilane, n-propyltrimethoxysilane, di-t-butyldimethoxysilane, cyclopentyl 1,1-dimethyl-2,2-dimethylethyldimethoxysilane and diamino silanes, the propylene homopolymer having a xylene soluble content of less than 2 percent, and a xylene insoluble fraction having a meso pentad content of greater than 96 percent and an average meso run length of at least 140, the propylene homopolymer having a melt flow rate of at least 60 dg/min to 300 dg/min.