Patent ID: 8969494
Filing Date: 2015-03-03
Classification: C08F,C08L,Y10S

Abstract:
1. A process for preparing an article comprising: injection molding a bimodal high density polyethylene (HDPE) resin having a molecular weight distribution (MWD), defined by the ratio of the weight average molecular weight (Mw) to the number average molecular weight (Mn), of at least 4.0 and of up to 6.0; wherein the bimodal HDPE resin comprises two polyethylene fractions A and B, fraction A being substantially free of comonomer and having a lower weight average molecular weight and a higher density than fraction B, each fraction prepared in different reactors of two reactors connected in series in the presence of a metallocene-containing catalyst system; wherein when fraction A is prepared in the first reactor of the two reactors connected in series, the ratio of the MI wherein when fraction B is prepared in the first reactor of the two reactors connected in series, the ratio of the HLMI of fraction B to the MI wherein the metallocene is selected from at least one of the following formula (I) or (II): wherein each R is the same or different and is selected from hydrogen or XR′ wherein R″ is a structural bridge between the two indenyl or tetrahydrogenated indenyls to impart stereorigidity that comprises a C wherein Q is a hydrocarbyl radical having from 1 to 20 carbon atoms or a halogen; and wherein M is a transition metal Group 4 of the Periodic Table or vanadium.