Synthetic hydrocarbon fluid
AssigneeExxonMobil Research and Engineering Company
InventorsMargaret May-Som Wu, Steven Edward Donnachie, James Thomas Carey, Walter David Vann, Norman Yang, Dilip Surana
Life of this patent
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Abstract
A synthetic lubricant base stock is provided hang a kinematic viscosity at 100° C. of from 5 to about 300 cS and a VI greater than 100. The base stock comprises random co-oligomers of an alpha olefin or mixtures thereof and an olefinic substituted aromatic compound which co-oligomers are prepared in the presence of a Friedel-Crafts catalyst.
Claims20
A lubricant base stock comprising:
- co-oligomers of an alpha olefin or mixture of alpha olefins and a olefinic substituted aromatic compound, the co-oligomers formed by co-oligomerizing in the presence of a Friedel-Crafts catalyst form about 1 to about 80 wt % of an olefinic substituted aromatic compound having the formula
- 3
- where R1, R2, R3 and R4 are independently H or a C1 to C4 alkyl group, and from 99 to about 20 wt % of an alpha olefin of from 6 to about 12 carbon atoms or a mixture of alpha olefin of from 6 to about 20 carbon atoms with at least 50% having less than 12 carbon atoms, the co-oligomerization being conducted under conditions and at a temperature and for a time sufficient to form oligomers consisting substantially of random co-oligomers.
A lubricant base stock having a kinematic viscosity at 100° C. of form 3 to 300 cS and a viscosity index greater than 70 comprising a mixture of randomly oriented co-oligomers of alpha-olefins having from 6 to about 12 carbon atoms or mixture of alpha-olefins having from 6 to 20 carbon atoms with at least 50% having less than 12 carbon atoms, and an olefinic substituted aromatic compound
- 4
- where R1, R2, R3 and R4 are independently H or a C1 to C4 alkyl group, wherein the mixture of co-oligomers contains substantially no block oligomers.
A process for preparing a lubricant base stock comprising:
- substantially simultaneously introducing, over an extended time period, an olefinic substituted aromatic compound, an alpha-olefin or mixture of alpha-olefins and a Friedel-Crafts catalyst into a reaction zone maintained at a temperature sufficient for co-oligomerization of the olefin or olefins and olefinic substituted aromatic compound to occur whereby a mixture of co-oligomers is formed, the alpha-olefin having from 6 to about 12 carbon atoms and the mixture of alpha-olefins having from 6 to about 20 carbon atoms with at least 50% thereof having less than 12 carbon atoms and the olefinic substituted aromatic compound having the formula
- 5
- where R1, R2, R3 and R4 are independently H or a C1 to C4 alkyl group.
A lubricant composition comprising:
- a major amount of co-oligomers of an alpha-olefin of 6 to 12 carbon atoms or mixture of alpha-olefin of having 6 to 20 carbon atoms with more than 50% thereof having less than 12 carbon atoms with an olefinic substituted aromatic compound having the formula
- 6
- where R1, R2, R3 and R4 are independently H or a C1 to C4 alkyl group, the co-oligomers having a kinematic viscosity at 100° C. of from 5 to 300 and wherein the co-oligomers contain less than about 3% of block oligomers;
- and
- an effective amount of one or more additives selected from the group consisting of antioxidants, viscosity index improvers, antiwear additives, rust inhibitors, extreme pressure agents, antifoamants and dispersants.
In a grease composition including a lubricating base stock, a thickener and grease additives, the improvement wherein the base stock comprises co-oligomers of an alpha-olefin of 6 to 12 carbons or a mixture of alpha-olefins of 6 to about 20 carbon atoms in which at least 50% thereof have less than 12 carbons atoms, with an olefinic substituted aromatic compound having the formula
- 7
- where R1, R2, R3 and R4 are independently H or a C1 to C4 alkyl group, wherein the co-oligomers have a kinematic viscosity at 100° C. of from 5 to 300 and wherein the co-oligomers contain less than about 3% of block oligomers.
Dependencies are inferred from the claim text.