Claims
- 1. A catalyst system comprising
- (a) a reaction product of
- (i) a bis(cyclopentadienyl) Group IV B metal compound; and
- (ii) a activator compound comprising
- (1) a cation, which will irreversibly react with at least one ligand contained in said Group IV B metal compound, and
- (2) a labile, bulky anion which is a single coordination complex having a plurality of lipophilic radicals covalently coordinated to and shielding a central charge-bearing metal or metalloid atom, or an anion comprising a plurality of boron atoms the bulk of said anion being such that upon reaction of the cation with a ligand of said bis(cyclopentadienyl) Group IV B metal compound whereby a Group IV-B metal cation is formed said anion is sterically hindered from covalently coordinating o the Group IV-B metal cation, and the lability of said anion being such that it is displaceable from said group IV-B metal cation by an unsaturated hydrocarbon having a Lewis base strength equal to or greater than ethylene; and
- (b) an organometallic additive compound.
- 2. The catalyst system of claim 1 wherein the additive compound is represented by the formula: ##STR2## wherein M'' is a Group III-A element, R, R', and R'' are independently, a straight or branched chain alkyl radical of C.sub.1 -C.sub.20 in carbon number, and R' may be an alkoxide radical; said additive compound being present in an amount sufficient to neutralize adventitious impurities.
- 3. The catalyst system of claim 1 wherein the ratio of said additive compound to said reaction product is from about 0.1:1 to about 200:1.
- 4. The catalyst system of claim 3, wherein said bis (cyclopentadienyl) Group IV-B metal compound is represented by one of the following general formulae:
- (A-Cp)MX.sub.1 X.sub.2 1.
- (A-Cp)MX'.sub.1 X'.sub.2 2.
- (A-Cp)ML 3N
- (Cp*)(CpR)MX.sub.1 4.
- wherein:
- M is a Group IV-B metal;
- (A-Cp) is either (Cp)(Cp*) or Cp-A'-Cp* and Cp and Cp* are the same or different substituted or unsubstituted cyclopentadienyl radical;
- A' is a covalent bridging group;
- L is an olefin, diolefin or aryne ligand;
- X.sub.1 and X.sub.2 are, independently, hydride radical, hydrocarbyl radical, substitued-hydrocarbyl radical, or organometalloid radical;
- X'.sub.1 and X'.sub.2 are joined and bound to the M metal atom to form a metallacycle, in which the M metal atom, X'.sub.1 and X'.sub.2 form a hydrocarbocyclic ring containing from about 3 to about 20 carbon atoms; and
- R is a substituent on one cyclopentadienyl radical which is bound to the M metal atom.
- 5. The catalyst system of claim 4, wherein the additive compound is a Group III-A organometallic compound.
- 6. The catalyst system of claim 5 wherein the additive compound is one of trialkyl aluminum, a trialkylborane, a dialkylalkoxyaluminum, a dialkylalkoxyborane, or mixtures thereof.
- 7. The catalyst system of claim 4, wherein said activator compound is a trisubstituted ammonium salt of a substituted aromatic boron compound.
- 8. The catalyst system of claim 7, wherein said activator compound is tri(n-butyl)ammonium tetrakis (pentaflourophenyl)boron or N,N-dimethylanilinium tetrakis(pentafluorophenyl)boron.
- 9. The catalyst system of claim 6, wherein the Group III-A element compound comprises triethylaluminum, trimethylaluminum or triethylborane.
- 10. The catalyst system of claim 4, wherein the Group IV-B metal compound is a bis(cyclopentadienyl) metal compound containing two, independently, substituted or unsubstituted cyclopentadienyl radicals and two lower alkyl substituents or two hydrides.
- 11. The catalyst system of claim 4, wherein said Group IV-B metal is titanium, zirconium, or hafnium.
- 12. The catalyst system of claim 4, wherein said Group IV-B metal is hafnium.
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a continuation in part of copending U.S. patent application Ser. No. 133,480 filed Dec. 22, 1987. U.S. Ser. No. 133,480 is in turn a continuation in part of U.S. Ser. No. 008,800 filed Jan. 30, 1987 and now abandoned.
Foreign Referenced Citations (5)
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Country |
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EPX |
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Non-Patent Literature Citations (2)
Entry |
Jordan et al., J. Am. Chem. Soc. 1986, 108, pp. 7410-11. |
Jordan et al., J. Am. Chem. Soc. 1986, 108, pp. 1718-19. |
Continuation in Parts (2)
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Number |
Date |
Country |
Parent |
133480 |
Dec 1987 |
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Parent |
8800 |
Jan 1987 |
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