Patent ID: 8528580

Claim:
A method of transporting water containing chlorine through a pipe, wherein the pipe is formed from a bi- or multi-modal polyethylene resin comprising: a high molecular weight (HMW), low density fraction; and a low molecular weight (LMW), high density fraction; wherein the HMW, low density fraction and the LMW, high density fraction are produced either with two or more single site catalyst systems in a single reactor or with a single site catalyst system in two serially connected reactors; wherein at least one of the single site catalyst systems is a metallocene catalyst system comprising a bisindenyl or a bis tetrahydroindenyl catalyst component of formula R″(Ind) 2 MQ 2 ; and wherein Ind is a substituted or unsubstituted indenyl or tetrahydroindenyl group, R″ is a structural bridge imparting stereorigidity to the complex, M is a metal Group 4 of the Periodic Table and Q is a hydrocarbyl having from 1 to 20 carbon atom or a halogen.