Blow molding polymers with improved cycle time, processability, and surface quality

A polymerization process, the process comprising contacting a catalyst composition with ethylene and an α-olefin comonomer in a polymerization reactor system under polymerization conditions to produce an ethylene polymer, wherein the ethylene polymer has:

• a density in a range from about 0.952 to about 0.965 g/cm3;
• a HLMI in a range from about 5 to about 25 g/10 min;
• a Mw in a range from about 275,000 to about 450,000 g/mol;
• a Mn in a range from about 15,000 to about 40,000 g/mol;
• a viscosity at HLMI (η @ HLMI) in a range from about 1400 to about 4000 Pa-sec;
• and
• a tan δ at 0.1 sec−1 in a range from about 0.65 to about 0.98 degrees;
• and
• the catalyst composition comprises:
• an unbridged metallocene compound containing two cyclopentadienyl groups, two indenyl groups, or a cyclopentadienyl and an indenyl group;
• a bridged metallocene compound with a cyclopentadienyl group and fluorenyl group, and an alkenyl substituent on the cyclopentadienyl group and/or on the bridging group;
• an activator-support comprising a solid oxide treated with an electron-withdrawing anion;
• and
• an organoaluminum compound.

An ethylene polymer having:

• a density in a range from about 0.952 to about 0.965 g/cm3;
• a high load melt index (HLMI) in a range from about 7 to about 15 g/10 min;
• a weight-average molecular weight (Mw) in a range from about 275,000 to about 450,000 g/mol;
• a number-average molecular weight (Mn) in a range from about 15,000 to about 40,000 g/mol;
• a viscosity at HLMI (η @ HLMI) in a range from about 1400 to about 4000 Pa-sec;
• and
• a tan δ at 0.1 sec−1 in a range from about 0.65 to about 0.98 degrees.