| 摘要 |
A catalyst system comprising
a) a metal complex of the formula CyLMZ p ,
wherein
M is a group 4 metal
Z is an anionic ligand,
p is number of 1 to 2, preferably 2
Cy is a cyclopentadienyl-type ligand and,
L is a guanidinate ligand of the formula
wherein each A is independently selected from the group consisting of nitrogen and phosphorus and R 1 , R 2 , R 3 and R 4 are independently selected from the group consisting of hydrogen, unsubstituted or substituted hydrocarbyl, unsubstituted or substituted silyl and unsubstituted or substituted germyl residues, and
b) a boron containing activator,
characterized in that the molar ratio of the boron of the activator and M of the metal complex is greater than 2.5. |
