Patent ID: 7563836

Claim:
A polypropylene, suitable for forming a blown film, the polypropylene comprising: a polypropylene copolymer containing less than 2% by weight units derived from ethylene and having a M w /M n of less than 6.0, a melt flow rate of from 7 to 20 g/10 min g/10 min, less than 3% xylene solubles, a pentad isotacticity of greater than 91%, 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 750 ppm to 2500 ppm of a nucleator/clarifier additive, wherein said additive is methylene-bis(4,6-di-tert-butylphenyl) phosphate sodium salt, and wherein a blown film is capable of being manufactured from the polypropylene 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 150,000 psi according to ASTM D882, a haze of less than 10 as measured by ASTM D1003, and a clarity of greater than 96%.