| 摘要 |
<p>The present invention relates to catalysts and/or catalyst systems useful for the polymerization or copolymerization of a-olefin. These catalysts contain O, S, Se, N, or P-containing transition metal compounds comprising the skeletal unit depicted in following formula (I): Wherein M is an element belonging to Group 3-11 of the Periodic Table; A, D and E each represent coordination group containing O, S, Se, N, or P atom.</p> |
