Patent ID: 8551903

Claim:
A process comprising: pre-halogenating a procatalyst precursor with a halogenating agent; adding an amide ester to the halogenated procatalyst precursor in a reaction mixture, the amide ester having the structure (II); wherein R 1 -R 6 , R 11 -R 13 , and R 21 -R 23 are the same or different, each of R 1 -R 6 , R 11 , R 13 R 21 , and R 23 is selected from a group consisting of hydrogen, a halogen, a substituted hydrocarbyl group having 1-20 carbon atoms, an unsubstituted hydrocarbyl group having 1-20 atoms, and combinations thereof and R 12 and R 22 , each is a halogen; and forming a procatalyst composition comprising a magnesium moiety, a titanium moiety, and an internal electron donor comprising the amide ester.