| abstract |
A gas phase method for producing a propylene-based polymer in a fluidized bed reactor, the reactor comprising a fluidized bed containing polymer product particles and a catalyst, the method comprising: a maximum monomer partial pressure, a maximum reactor temperature, and a comonomer content in the propylene-based polymer ( S) has a set of quantitative criteria. The propylene-based polymer may be EBPT or BPRCP. The catalyst comprises (1) a supported Ziegler-Natta procatalyst, (2) a cocatalyst, and (3) (a) an activity limiting agent comprising at least one carboxylate ester functional group, and (b) a selectivity controlling agent. It may include a catalyst/donor system including a mixed external electron donor system. |