Patent ID: 7393910

Claim:
A process for polymerizing an olefin monomer comprising: (i) contacting, in a reactor, the olefin monomer, the olefin monomer consisting of ethylene, with a catalyst composition comprising one or more Group 3-10 transition metal containing Ziegler-Natta procatalyst compounds; and one or more alkylaluminum cocatalysts; (ii) providing to the reactor one or more polymerization control agents, wherein at least one such polymerization control agent is an alkyl or aryl ester of an aliphatic or aromatic (poly)carboxylic acid optionally containing one or more substituents comprising a Group 13, 14, 15, or 16 heteroatom and the polymerization control agents is or are provided at a polymerization to co-catalyst ratio from 1:1 to 1:100 such that the polymerization control agent stops the polymerization reaction at a temperature greater than 100° C.; (iii) gas phase polymerizing at a reactor temperature of greater than 80° C. to form a polymer; and (iv) extracting the polymer from the reactor.