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US 4,967,029 AGranted
Liquid lubricants from alpha-olefin and styrene copolymers
AssigneeMobil Oil Corporation
InventorMargaret M. Wu
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AssigneeMobil Oil Corporation
InventorMargaret M. Wu
Estimating the term…
Alpha-olefins such as 1-decene are copolymerized with vinylaromatic monomers, especially styrene or the alkylstyrenes, to produce liquid lubricant oligomers having a broad range of viscosities, high viscosity index(VI), improved thermal stability and additive solubility characteristics. The lubricant oligomers are random copolymers containing recurring units of 1-alkene and vinyl aromatic monomer in mole ratios between 2:1 and 500:1, but preferably between 5:1 and 100:1 and more preferably from about 10:1 to 50:1. The recurring 1-alkene units of the copolymer have a branch ratio of less than 0.19, indicative of a poly 1-alkene segment of the copolymer chain or backbone that is essentially linear. The copolymerization catalyst is a reduced Group VIB metal catalyst on porous support, preferably reduced chromium oxide on a silica support.
A process for the production of liquid hydrocarbon lubricant having enhanced thermal stability from C.sub.6-C.sub.20 alpha-olefins and vinyl aromatic compounds, comprising;
A liquid hydrocarbon lubricant composition having enhanced thermal stability comprising a random coplymer of C.sub.6-C.sub.20 alpha-olefin monomer and vinyl aromatic monomer, said composition having a pour point below -15.degree. C., viscosity index of about 130 to 280 and viscosity up to about 750 cS at 100.degree. C;
A liquid hydrocarbon lubricant comprising the copolymerization product of C.sub.6-C.sub.20 alpha-olefins and vinyl aromatic compounds with chromium catalyst on porous support, which catalyst has been treated by oxidation at a temperature of 200.degree. C. to 900.degree. C. in the presence of an oxidizing gas and then by treatment with a reducing agent at a temperature and for a time sufficient to reduce said catalyst to a lower valence state.
Dependencies are inferred from the claim text.