| 摘要 |
A method of polymerizing at least one olefin comprising contacting the olefin with a catalyst composition comprising:1) a procatalyst composition comprising a magnesium and titanium-containing component and an electron donor compound of the structure:wherein R1 is ethoxy, and R2 is an alkoxy group having from one to ten carbon atoms, and R3-R6 are each individually, hydrogen, hydrocarbyl, hydrocarboxy, nitro, a silyl group or a halogen,2) a cocatalyst and optionally3) a selectivity control agent.
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