Patent ID: 8163226
Filing Date: 2012-04-24
Classification: C08K,C08L,F16L,Y10T

Abstract:
1. A process for making a pipe consisting essentially the steps of: selecting an ethylene alpha-olefin interpolymer composition, wherein said ethylene alpha-olefin interpolymer composition has a density in the range of 0.925 to 0.965 g/cc, a melt index (I selecting an antioxidant system, wherein said antioxidant system consist essentially of; optionally one or more metal deactivators; forming said alpha-olefin interpolymer composition and said antioxidant system into a pipe; wherein said pipe has an F time in Jana Laboratories Procedure APTF-2 of at least 1000 hours, under the following conditions: pH 6.8 (±0.1); Chlorine 4.1 mg/L (±0.1); Nominal ORP 830mV; fluid temperature 110° C. (±1); air temperature 110° C. (±1); pressure 70 psig (±1); flow rate 0.1 US gallons/min (±10 percent).