Polyethylene processes and compositions thereof

A process for preparing a polyethylene composition comprising the following steps:

• (a) providing at least a first amount of ethylene and a first amount of hydrogen to a first gas-phase reactor;
• (b) providing at least a first amount of Ziegler-Natta catalyst to the first gas-phase reactor to produce at least a first amount of polyethylene polymer within the first gas-phase reactor;
• (c) transferring at least a portion of the first amount of polyethylene polymer and at least a portion of the first amount of Ziegler-Natta catalyst to a second gas-phase reactor;
• (d) providing at least a second amount of ethylene in the presence of a second amount of hydrogen to the second gas-phase reactor to obtain a second polyethylene polymer to produce a polyethylene composition comprising the first polyethylene polymer and the second polyethylene polymer, wherein the polyethylene composition comprises a density of greater than about 0.946 g/cm3, a MI2 from about 0.20 to about 0.40 g/10 min, a Mw/Mn ratio from about 15 to about 30, and a long-chain branching index lower than about 0.60;
• wherein at least one of the first or second gas-phase reactors comprises a first and second polymerization zone, the first polymerization zone having a first hydrogen pressure and the second polymerization zone having a second hydrogen pressure, wherein the first hydrogen pressure and the second hydrogen pressure are different such that at least a portion of the second amount of ethylene moves through the first and second polymerization zones and at least a portion of a gas mixture of each polymerization zone is partially or totally prevented from entering the other zone.