Patent ID: 8247497

Claim:
A polyethylene blend composition obtained in a two staged first and second reactors connected in series with a catalyst fed into the first reactor via a catalyst feed tube to produce a first ethylene polymer, wherein a mixture of said first ethylene polymer and active catalyst is transferred from the first reactor to the second reactor in which a second ethylene polymer is prepared and blended in situ with the first ethylene polymer, wherein said polyethylene blend composition comprises: a) from 10 to 90 weight percent of said first ethylene polymer having a density in a range of from 0.947 to 0.962 g/cm 3 , a melt index of from 1 to 10 g/10 minutes, b) from 90 to 10 weight percent of said second ethylene polymer having a density in a range of from 0.918 to 0.932 g/cm 3 , a melt index of from 0.25 to 6 g/10 minutes, wherein the difference of densities of said first ethylene polymer (A) and said second ethylene polymer (B) (ΔD=D (A) −D (B) ) is equal to or greater than 0.03 g/cm 3 , wherein said polyethylene blend composition includes from 0.05 to 5 percent per weight of 1-hexene based on total weight of said composition; and wherein said polyethylene blend composition has an Environmental Stress Crack Resistance according to ASTM D-1693 procedure B with 100% Branched Octylphenoxy Poly (Ethyleneoxy) Ethanol, exceeding 80 hours.