Patent ID: 8697808
Filing Date: 2014-04-15
Classification: C08L

Abstract:
1. A polymerization process comprising the steps: a) polymerizing ethylene in the presence of a first Ziegler-Natta catalyst comprising titanium, magnesium, and aluminum at a temperature from 140° C. to 250° C. in the absence of hydrogen to produce a first ethylene polymer component having a first degree of long-chain branching that corresponds to a rheological polydispersity from 2.5 to 10; b) polymerizing ethylene at a temperature from 140° C. to 250° C. under conditions effective to produce second ethylene polymer component having a second degree of long chain-branching that corresponds to a rheological polydispersity from 0.8 to 1.8; and c) combining the first and second ethylene polymer components to give a polymer blend wherein a third degree of long-chain branching in the blend is controlled by adjusting the relative amounts of the first and second ethylene polymer components.