Alkylated naphthalenes as synthetic lubricant base stocks
OwnerMargaret May-Som Wu, Philip Trottoinventors
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Abstract
This invention relates to alkylated methylnaphthalenes and their utility in lubricant base stocks. In particular, the alkylated methylnaphthalenes of the present invention have unexpectedly superior thermal and oxidative properties and may be used to improve the performance characteristics of other lubricant base oils.
Claims15
A method for improving the oxidative stability of a lubricant having an RBOT of ≦ about 200 minutes comprising adding to said lubricant a base oil comprising a compound of formula (I):
- 4
- wherein R1 and R2 are H, methyl, ethyl, propyl, or butyl;
- R3 and R4 are an alkyl group having from about 6 to about 24 carbon atoms;
- x is from 0 to about 2;
- and
- y is from 0 to about 4;
- with the proviso that at least one of R1 and R2 is other than H, and at least one of x and y is other than 0;
- and wherein the base oil has a RBOT value of greater than about 200 minutes.
A synthetic base oil comprising a mixture of monoalkylated and polyalkylated naphthalenes wherein the improvement comprises said synthetic base oil containing at least 20 wt % of an alkylated naphthalene selected from the group consisting of a compound or mixture of compounds of the following formula (I):
- 5
- wherein R1 and R2 are H, methyl, ethyl, n-propyl, n-butyl, or t-butyl;
- R3 and R4 are an alkyl group having from about 6 to about 24 carbon atoms;
- x is from 0 to about 2;
- and
- y is from 0 to about 4;
- with the proviso that at least one of R1 and R2 is other than H, and at least one of x and y is other than 0.
The synthetic base oil of 13 wherein at least one of R1 and R2 is hydrogen.
Dependencies are inferred from the claim text.