Ethylene-alpha olefin copolymer's and polymerization processes for making the same

ethylene-alpha-olefin copolymers and polymerization processes for the manufacture thereof. the present invention relates to a process for the production of a copolymer of ethylene and alpha-olefin. The process comprises the polymerization of ethylene and at least one alpha-olefin by contacting the ethylene and at least one alpha-olefin with a metallocene catalyst in at least one gas phase reactor at a reactor pressure from 0.7 to 70 bar) 0.07 to 7 mpa and at a reactor temperature of from 200 C to 1500 C to form a copolymer of ethylene and alpha-olefin. copolymer according to the resulting ethylene and alpha-olefin may have a density of 0.927 g / cc or greater and an environmental crack resistance of 500 hr or more when measured according to 1693 / b in 10% .