Patent ID: 8445594

Claim:
A bottle cap closure comprising: a high-density polyethylene composition comprising: a first component, said first component is an ethylene alpha-olefin copolymer having a density in the range of 0.921 to 0.936 g/cm 3 , and a melt index (I 21.6 ) in the range of 0.5 to 5 g/10 minutes; and a second component, said second component is an ethylene polymer having a density in the range of 0.970 to 0.975 g/cm 3 , and a melt index (I 2 ) in the range of 500 to 1000 g/10 minutes; wherein said high-density polyethylene composition has a melt index (I 2 ) of from 1 to 20 g/10 minutes, a density in the range of 0.950 to 0.960 g/cm 3 , and g′ of 1, and a molecular weight distribution (M w /M n ) in the range of 7 to 17; wherein said high-density composition has an environmental stress crack resistance of at least 150 hours measured via ASTM D-1693 condition B, 10 percent Igepal, or at least 300 hours measured via ASTM D-1693 condition B, 100 percent Igepal.