Claims
- 1. A liquid polyethylene composition having 151 to 586 branches per 1000 CH.sub.2 groups and a molecular weight between about 300 and about 30,000.
- 2. The liquid polyethylene composition of claim 1 having about 160 to 570 branches per 1000 CH.sub.2 groups.
- 3. The liquid polyethylene composition of claim 2 having about 300 to 400 branches per 1000 CH.sub.2 groups.
- 4. A lube basestock composition comprising a liquid polyethylene composition of claim 1.
- 5. The liquid polyethylene composition of claim 1 having a viscosity index between about 94 and about 151.
- 6. The liquid polyethylene composition of claim 5 wherein the viscosity index is between about 120 and 150.
- 7. The liquid polyethylene composition of claim 1 having a pour point of from about -60 to about -10.degree. C.
- 8. A process for preparing a liquid polyethylene composition having 151 to 586 branches per 1000 CH.sub.2 groups and a molecular weight between about 300 and about 30,000 from ethylene, said process comprising:
- polymerizing ethylene in the presence of a catalyst system, said catalyst system comprising [A] and [B], wherein [A] is a catalyst having the formula MX.sub.5 and [B] is a co-catalyst having the formula R.sub.n AlX.sub.3-n where
- M is a Group VB transition metal;
- X is a halogen;
- R is a C.sub.1 -C.sub.20 alkyl group; and
- n is 1-2.
- 9. The process of claim 8 wherein said polymerization step is performed in the presence of a solvent.
- 10. The process of claim 9 wherein the solvent is a halogenated aromatic compound.
- 11. The process of claim 10 wherein the halogenated aromatic compound is selected from the group consisting of chlorobenzene, dichlorobenzene, trichlorobenzene, and mixtures thereof.
- 12. The process of claim 9 wherein the solvent is an aliphatic hydrocarbon comprising from about C.sub.5 -C.sub.20 paraffins or mixtures thereof.
- 13. The process of claim 8 wherein said at least one component of said catalyst system is supported on an inert support.
- 14. The process according to claim 13 wherein said inert support is selected from the group consisting of silica, alumina, carbon, zirconia, magnesia, diatomatious earth, kieselgur, and mixtures thereof.
- 15. The process of claim 8 performed in the presence of a Lewis acid.
- 16. The process of claim 15 wherein the Lewis acid is AlCl.sub.3 or FeCl.sub.3.
- 17. The process of claim 8 wherein the Group VB transition metal is Ta.sup.5+.
- 18. The process of claim 8 wherein the molar ratio of [A] to [B] is 0.1 to 10.
- 19. The process of claim 18 wherein the molar ratio of [A] to [B] is 1 to 1.
- 20. The polyethylene fluid prepared by the process of claim 8.
- 21. A synthetic lubricant basestock comprising the polyethylene fluid of claim 20.
- 22. A lubricating oil composition, comprising a liquid hydrocarbon composition prepared by the process of claim 8 as a lubricating oil basestock; and optionally, effective amounts of lubricating oil additives selected from the group consisting of antioxidants, anti-wear additives, extreme pressure additives, friction modifiers, viscosity index improvers, pour point depressants, detergents, dispersants, corrosion inhibitors, metal deactivators, seal compatibility additives, demulsifiers and anti-foam additives and mixtures thereof.
- 23. The lubricating oil composition of claim 22, further comprising an additional lubricating oil basestock selected from the group consisting of a mineral oil, synthetic PAO, esters, wax isomerates, polyalkylenes, alkylated aromatics, hydrocrackates and solvent-refined basestocks.
- 24. The lubricating oil composition of claim 23, wherein said liquid hydrocarbon composition is present at a concentration level of at least 5 wt % of the total lubricating oil basestock composition.
RELATED APPLICATIONS
This application claims benefit of U.S. Provisional Application Ser. No. 60/078,695, filed Mar. 20, 1998, the disclosure of which is hereby incorporated by reference in its entirety.
The present invention is related to commonly assigned application Ser. No. 09/272,411, filed on Mar. 19, 1999, entitled "Synthesis of Branched Polyethylene Fluids For Use in Lubricant Compositions".
US Referenced Citations (20)
Foreign Referenced Citations (1)
Number |
Date |
Country |
WO 9947628A |
Mar 1999 |
EPX |
Non-Patent Literature Citations (2)
Entry |
Henrici-Olive, G. et al., "Oligomerization of Ethylene with Soluble Transition-Metal Catalysts", Adv. Poly. Sci., 1974, 15, 1-30 month unavailable. |
Kim, J.S. et al., "Novel Nickel(II) and Palladium(II)-Based Catalyst Systems for the Synthesis of Hyperbranched Polymers from Ethene", J. Am. Chem. Soc., 1998, 120, 1932 month unavailable. |