Use of temperature and ethylene partial pressure to introduce long chain branching in high density polyethylene

A long chain branched high density ethylene polymer having:

• at least 95 mol % ethylene;
• a density of from 0.950 g/cm3 to 0.96 g/cm3;
• an Mw/Mn of 4.5 or less;
• a melt index (190° C., 2.16 kg) of 5 dg/min or less;
• an Mw within a range of from 68,945 to 133,530;
• a g′(Zave) within a range of from 0.89 to 0.925;
• high load melt index (190° C., 21.6 kg) within a range of from 2.16 to 108.35 dg/min;
• a melt index ratio (MIR) within a range of from 31.43 to 64.73;
• and
• wherein polyethylene having an Mw of 1000 or less are present at less than 5 wt %, based upon the weight of the polyethylene polymer;
• and produced by a method of combining ethylene and a bridged or unbridged bis-indenyl or bis-tetrahydroindenyl metallocene catalyst compound.