Bis-phosphinimine catalyst
AssigneeNOVA Chemicals (International) S.A.
InventorsStephen John Brown, Xiaoliang Gao, Daryll G. Harrison, Ian McKay, Linda Koch, Qinyan Wang, Wei Xu, Rupert Edward von Haken Spence, Douglas W. Stephan
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Abstract
Organometallic complexes having two phosphinimine ligands and at least one activatable ligand are catalyst components for olefin polymerization. Preferred polymerization systems are prepared by combining the organometallic complexes with an ionic activator and/or an alumoxane. Preferred catalyst components contain titanium, zirconium, or hafnium and are activated with an ionic activator to form catalysts for ethylene polymerization.
Claims14
A catalyst component for olefin polymerization which is an unbridged bis-phosphinimine complex defined by the formula:
- (Pl)2—M—Ln
- wherein M is a metal selected from group 2-14 10 metals;
- each Pl is independently a phosphinimine ligand defined by the formula:
- wherein each R1 independently selected from the group consisting of (a) a hydrogen atom, (b) a halogen atom, (c) C1-20 hydrocarbyl radicals which are (i) unsubstituted or (ii) further substituted by a halogen atom, (d) a C1-8 alkoxy radical, (e) a C6-10 aryl or aryloxy radical, (f) an amido radical, (g) a silyl radical of the formula:
- —Si—(R2)3
- wherein each R2 independently selected from the group consisting of hydrogen, a C1-8 alkyl or alkoxy radical, C6-10 aryl and C6-10 aryloxy radicals, and (h) a germanyl radical of the formula:
- Ge—(R2)3
- wherein R2 is as defined above;
- L is an activatable ligand;
- n is 1, 2 or 3 depending upon the valence of M with the proviso that L is not a cyclopentadienyl, indenyl or fluorenyl ligand;
- and
- B an activator.
Dependencies are inferred from the claim text.