| abstract |
Provided herein are metallocene-catalyzed polymer compositions and polymerization methods suitable for forming such polymer compositions that exhibit favorable rheological properties, at least some of which are consistent with long chain branching. The polymer composition may have both an LCB index measured at 125°C of less than 5 and a phase angle δ at complex shear modulus G* = 100,000 Pa measured at 125°C of less than about 54.5°. The polymer compositions of particular embodiments are reactor blends, preferably reactor blends of ethylene copolymers such as ethylene-propylene copolymers (EP) and/or ethylene-propylene-diene (EPDM) terpolymers. mixture. The reactor blend may comprise first and second copolymer components, which may differ in monomer content and weight average molecular weight (Mw). |