Patent ID: 8133963
Filing Date: 2012-03-13
Classification: C08F,C08J,C08K,C08L,Y10T

Abstract:
1. A polypropylene, suitable for forming a blown film, the polypropylene comprising: a homopolymer polypropylene having a M w /M n of less than 6.0, a melt flow rate in the range of from 8 to 13 g/10 min, less than 2% xylene solubles, a pentad isotacticity of greater than 95%, an isotactic pentad/triad ratio of greater than 95%, a crystallinity of at least 65%, and a crystallization temperature of at least 127° C., the polypropylene containing from 500 ppm to 2500 ppm of a nucleator/clarifier additive and wherein a blown film is capable of being manufactured from the resin at a rate of at least 6 lb/hr-in of die circumference and wherein a one mil thick blown film manufactured from the polypropylene using at least a 1.5 blow-up ratio exhibits a 1% secant modulus of at least 200,000 psi according to ASTM D882, a haze of less than 10 as measured by ASTM D1003, and a clarity of greater than 96%.