Solution phase polymerization process

A continuous solution phase polymerization process to make a polyethylene composition, the process comprising:

• feeding ethylene, a process solvent, a metallocene catalyst, a phosphinimine catalyst, optionally one or more than one α-olefin and optionally hydrogen into a first polymerization reactor to produce a first effluent stream comprising a first polyethylene which is made in the first reactor;
• feeding the first effluent stream, ethylene, a process solvent, a Ziegler-Natta catalyst, optionally one or more than one α-olefin and optionally hydrogen into a second polymerization reactor configured in series with the first polymerization reactor to produce a second effluent stream comprising the first polyethylene, and a second polyethylene which is made in the second reactor;
• and
• a) recovering the polyethylene composition from the second effluent stream;
• or,
• b) feeding the second effluent stream, optionally ethylene, optionally a process solvent, optionally a polymerization catalyst selected from a single site catalyst or a Ziegler-Natta catalyst, optionally one or more than one α-olefin, and optionally hydrogen into a third polymerization reactor configured in series with the second polymerization reactor to produce a third effluent stream comprising the first polyethylene, the second polyethylene, and a third polyethylene which is made in the third reactor;
• and
• recovering the polyethylene composition from the third effluent stream.