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 having 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 from about 1 to about 80 wt % of an olefinic substituted aromatic compound having the formula
- 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 at a temperature and under conditions selected from the group consisting of:
- (a) continuously feeding the reactants into a reaction zone under steady state conditions with average residence time of olefin or mixture of olefin, olefinic substituted aromatic compound and catalyst in the range of from about 0.1 to about 10 hours;
- and
- (b) by introducing the olefin or mixture of olefins, olefinic substituted aromatic compound and catalyst substantially simultaneously into a reaction zone over an extended time period whereby substantially random co-oligomers are found.
A process for preparing a lubricant base stock com- prising:
- substantially simultaneously introducing, over an extended time period, an olefinic substituted aromatic compound, an alpha-olefin or mixture of alpha-olefins and a Friedl-Crafts catalyst into a reaction zone maintained at a temperature sufficient for co-oligomerization of the olefin or 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 about 20 carbon atoms with at least 50% thereof having less than 12 carbon atoms and the olefinic substituted aromatic compound hav- ing the formula
- 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
- 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 cS to 300 cS, wherein the co-oligmers contain less than about 3%of block oligomers, wherein the co-oligomers are prepared by co-oligomerizing the olefin or mixture of olefins and the olefinic aromatic compound at a temperature and under conditions selected from the group consisting of
- (a) continuously feeding the reactants into and removing the co-oligomers from a reaction zone under steady state con- ditions with average residence time of olefin or mixture of olefin, olefinic substituted aromatic compound and catalyst in the range of from about 0.1 to about 10 hours and
- (b) by introducing the olefin or mixture of olefins, olefinic substituted aromatic compound and catalyst substantially simultaneously into a reaction zone over an extended time period, whereby substantially random co-oligomers are formed;
- 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 of 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
- where R1, R2, R3 and R4 are independently H or C1 to C4 alkyl group, wherein the co-oligomers have a kinematic viscosity at 100° C. of from 5 cS to 300 cS and wherein the co-oligomers contain less than about 3% of block oligomers.
Dependencies are inferred from the claim text.