Chemistry of hydrocarbon compounds – Compound or reaction product mixture – Polymer of indefinite molecular weight
Patent
1999-03-19
2000-11-21
Howard, Jacqueline V.
Chemistry of hydrocarbon compounds
Compound or reaction product mixture
Polymer of indefinite molecular weight
585512, 585522, 585523, 585524, 585 10, 508591, 526144, 526352, C10M10704, C07F 922
Patent
active
061505765
ABSTRACT:
The novel synthetic polyethylene fluids of the present invention are characterized by high viscosity indices (about 94-151 VI), low pour points (about -60 to -10.degree. C.), and a kinematic viscosity of about 6 to 28 cSt KV at 100.degree. C. The product compositions comprise polymers having a molecular weight of from about 300 to 30,000 and a high branching index of 151 to 586 branches per 1000 CH.sub.2 groups, or BI=0.18-0.40, wherein the polymer is substantially free of methyl branches. Highly-branched polyethylene fluids that have less than 5 methyl branches per 1000 CH.sub.2 groups are prepared by polymerizing ethylene in the presence of a catalyst system consisting of [C] and [B], wherein [C] is a catalyst having the empirical formula MX.sub.4 and [B] is a co-catalyst having the empirical formula R.sub.n AlX.sub.3-n, where M is a Group IVB transition metal, X is a halogen anion, R is a C.sub.1 -C.sub.20 alkyl group, and n is 1-2, in the presence of a promoter, wherein the promoter is selected from the group consisting of hydrogen or a Lewis acid such as, for example, FeCl.sub.3, AlCl.sub.3, or mixtures thereof.
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Jiang Zhaozhong
Long Gregory S.
Murtuza Shahid
Schramm Suzanne E.
Sen Ayusman
Howard Jacqueline V.
Keen M. D.
Mobil Oil Corporation
The Pennsylvania University
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