PROCESS FOR CONDITIONING A GAS-PHASE REACTOR TO PRODUCE AN ETHYLENE-PROPYLENE OR ETHYLENE-PROPYLENE-DIENE RUBBER

摘要

There is provided process for producing an ethylene-alpha-olefin polymer at a polymerization reaction temperature in excess of the softening temperature of the polymer in a gas-phase fluidized-bed reactor in the presence of a polymerization catalyst and wherein the polymerization reaction is conducted in the presence of an inert particulate material, the improvement comprising: commencing polymerization by polymerizing an ethylene-propylene rubber having a crystallinity ranging from about 4 to 18 percent as measured by differential scanning calorimetry.