Patent ID: 7592395

Claim:
A single piece acidic beverage bottle cap made from a polymer resin comprising: a first polyethylene polymer having a multimodal molecular weight distribution such that a ratio of weight average molecular weight (M w ) of the polymer to number average molecular weight (M n ) of the polymer is at least about 12, wherein the first polyethylene polymer has a low load melt index (MI 2 ) from about 0.2 dg/min to about 5.6 dg/min and a second polyethylene polymer having a low load melt index (MI 2 ) of from about 0.2 dg/min to about 5.6 dg/min, such that the polymer resin has: a density from about 0.941 g/cm 3 to about 0.965 g/cm 3 ; a low load melt index (MI 2 ) from about 0.2 dg/min to about 5.6 dg/min; a multimodal molecular weight distribution in which the ratio of weight average molecular weight (M w ) of the resin to number average molecular weight (M n ) of the resin is at least about 12 and is less than about 30; and a 10% environmental stress cracking resistance of at least about 75 hours.