| 摘要 |
A catalyst precursor having the formula:wherein each A has the formula:M is a metal selected from the group consisting of Group elements;each L is a monovalent, bivalent, or trivalent anion;X and Y are each heteroatoms;Cyclo is a cyclic moiety;each R1 is a group containing 1 to 50 atoms selected from the group consisting of hydrogen and Group 13 to 17 elements, and two or more adjacent R1 groups may be joined to form a cyclic moiety;each R2 is a group containing 1 to 50 atoms selected from the group consisting of hydrogen and Group 13 to 17 elements, and two or more adjacent R2 groups may be joined to form a cyclic moiety;Q is a bridging group;each m is independently an integer from 0 to 5;n is an integer from 1 to 4;q is 1 or 2;and when q is 2, the A groups are optionally connected by a bridging group Z is provided. The catalyst precursor, when combined with an activating cocatalyst, is useful for the polymerization of olefins.
|
