Patent ID: 7741414

Claim:
An on the fly process for transitioning between a polymerization conducted with a Ziegler Natta catalyst and a polymerization conducted with a Second Catalyst, wherein said process employs at least an upstream polymerization reactor and a downstream polymerization reactor, and wherein said process is characterized by a transition step wherein said Ziegler Natta catalyst is employed in said downstream reactor and said Second Catalyst is employed in said upstream reactor, said process comprising: (1) conducting a Ziegler Natta polymerization in said downstream reactor; (2) initiating a polymerization reaction with said Second Catalyst in said upstream reactor; (3) terminating said Ziegler Natta polymerization; and (4) initiating a polymerization reaction with said Second Catalyst in said downstream reactor, with the proviso that said transition is from said Zeigler Natta catalyst to said second catalyst.