| 摘要 |
A novel catalyst system comprises a metallocene, a Lewis base, a support and an organo-boron or organo-aluminum compound. The catalyst is covalently bonded to the support. A catalyst system contains: (A) a metallocene, (B) a Lewis base of formula (1), (C) a support and (D) an organo-boron or organo-aluminum compound formed from units of formula (2). The catalyst is covalently bonded to the support. M<1>R<3>R<4>R<5> (1) ((R<5>)-X-M<2>(R<8>)-X-(R<7>))k (2) R<3>, R<4>, R<5> = H, 1-20C alkyl, optionally halogenated, 6-40C aryl, optionally halogenated, 7-40 arylalkyl or alkylaryl, or two or three of R<3>-R<5> may combine with each other; M<1> = a Group V element, preferably nitrogen or phosphorus; R<6>, R<7>, R<8> = H, halogen, a boron-free 1-40C hydrocarbon, preferably 1-20C alkyl, optionally halogenated, 1-10C alkoxy, 6-20C aryl, optionally halogenated, 6-20C aryloxy, 7-40C arylalkyl or alkylaryl, optionally halogenated or SiR<9>3; R<9> = a boron-free 1-40C hydrocarbon, preferably 1-20C alkyl, optionally halogenated, 1-10C alkoxy or 6-20C aryl, optionally halogenated, X = a Group IV, V or VIa element or -NH; M<2> = a Group IIIa element; and k = 1-100. An Independent claim is also included for a process for the production of a polyolefin by polymerization of at least one olefin in the presence of the catalyst system.
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