Patent ID: 8067518

Claim:
An ethylene alpha-olefin copolymer formed by contacting at least one supported metallocene catalyst, ethylene, and at least one other alpha-olefin in a gas phase reactor, the copolymer having the following properties: i.a density of from 0.940 to 0.954 g/cc; ii. a melt index I 2 of from 1.5 to 80 dg/min; iii. a melt index ratio MI 21 /MI 2 of 20 or less; iv. an ESCR value of 1000 hours or greater; and v. a 1% secant modulus of 75,000 psi or greater, wherein the metallocene is bis(n-propylcyclopentadienyl)hafnium X n , wherein X is selected from C 1-12 alkyls; and wherein n is zero or an integer from 1 to 4.