Patent ID: 6995217

Claim:
A process for transitioning from a first polymerization reaction conducted in the presence of a first catalyst, to a second polymerization reaction conducted in the presence of a second catalyst, wherein the first and second catalysts are incompatible, the process comprising: a) discontinuing the introduction of the first catalyst into a reactor wherein the first catalyst comprises a metallocene catalyst; b) introducing and dispersing in the reactor the second catalyst in an amount sufficient to substantially halt the first polymerization reaction, wherein the second catalyst comprises a traditional Ziegler-Natta catalyst and wherein the second catalyst is introduced in the absence of any significant amount of an activator or co-catalyst for the second catalyst; and c) after the first polymerization reaction is halted by introduction of the second catalyst, introducing into the reactor an activator or co-catalyst for the second catalyst in an amount sufficient to effectively activate the second catalyst.