Patent ID: 6201079
Filing Date: 2001-03-13
Classification: C08F,C08G,C08J,Y02P

Abstract:
An oriented polypropylene film made from a homopolymer of propylene produced by polymerizing propylene in gas-phase, bulk, or slurry using a catalyst system comprising:(a) a high activity magnesium halide-supported, titanium-containing solid component;(b) an aluminum alkyl; and(c) an external modifier comprising isobutylmethyldimethoxysilane;wherein the Si/Ti ratio is about 1 to about 10 and the Al/Ti ratio is about 10 to about 500, and wherein the polypropylene has an NMR mmrr pentad content of greater than 3% and decalin solubles greater than 5 wt. %.