Patent ID: 6403181
Filing Date: 2002-06-11
Classification: C08F,C08L,Y10T

Abstract:
A conduit having a diameter of at least about 2 mm which exhibits a life time of at least 100 hours at a hoop stress of 5 megapascal (MPa) at 80Â° C. and an impact strength of greater than 3 kJ/m2 at 0Â° C. and comprising greater than 80% by weight of polyethylene resin selected from polymers of ethylene; copolymers of ethylene; and mixtures of said polymers and copolymers of ethylene; the polyethylene resin prepared in the presence of a supported bimetallic polymerization catalyst comprising a metallocene component, the metallocene component comprising a transition metal, and a non-metallocene component, the non-metallocene component comprising a transition metal, the polyethylene resin comprising at least two components which differ from each other in average molecular weight, one component of the at least two components exhibiting a higher average molecular weight than a second of the two components, the second component exhibiting a lower average molecular weight than the one component, the polyethylene resin having a High Load Melt Index (FI) as measured according to ASTM D 1238, Condition F, at 190Â° C. and a load of 21,600 g, of 2 to 20 dg/min and containing a residue of the bimetallic catalyst in an amount which results in up to 20 ppm of the transition metals provided by the bimetallic catalyst residue in the resin.