Patent ID: 8614162

Claim:
A catalyst composition comprising: a procatalyst composition comprising a magnesium moiety; a cocatalyst; and a phosphorus-based external electron donor having the structure (IX) wherein R 1 and R 2 are the same or different and each of R 1 -R 2 is selected from the group consisting of a substituted hydrocarbyl group having 1 to 20 carbon atoms, an unsubstituted hydrocarbyl group having 1 to 20 carbon atoms, and combinations thereof; and X is an amino group selected from the group consisting of —NH 2 , —NHR 3 , and —NR 3 R 4 , wherein R 3 and R 4 are the same or different and each of R 3 and R 4 is selected from the group consisting of a substituted hydrocarbyl group having 1 to 20 carbon atoms and an unsubstituted hydrocarbonyl group having 1 to 20 carbon atoms.