| 摘要 |
An olefin metathesis catalyst system and process for the metathesis polymerization of cyclic olefins, such as dicyclopendatiene, are disclosed. The catalyst system comprises the reaction product of: (a) an imido transition metal halide complex of formula a) wherein Ar is C6-20 aryl, preferably phenyl; M is a transition metal selected from the second and third rows of groups 5, 6, 7 and 8 of the Periodic Table and including for example niobium, tantalum, molybdenum, tungsten, rhenium, ruthenium or osmium, preferably tungsten or molybdenum; R is independently halide, C1-20 alkyl, C1-12 alkoxy, C1-12 haloalkyl, C6-20 aryl, C6-20 aryloxy, cyano or combinations thereof; L is independently a complexing ligand selected from carbonyl, C1-12 alkoxy, C1-12 haloalkoxy, C1-12 alkyl ethers, including C1-12 alkylnitriles, C5-20 pyridines, C3-36 tri(hydrocarbyl)phosphines, X is independently halide, x is 2 to 4; r is independently 0 to 5; 7 is 0 to 3, preferably 0 or 1; and x + y = 3, 4 or 5; and (b) a biphenol of formula (II) in which each Ar represents an aromatic ring-containing moiety having at least one hydroxyl group attached to an aromatic ring, each R is independently selected from C1-12 alkyl, aryl halide, mono-, di or trihalo methyl, cyano and alkoxy or together form an alkylene; each n is independently 0-4; and m is independently 1-4; and the catalyst system further includes a co-catalyst.
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