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US 5,665,684 AGranted
Lubricating oil composition
AssigneeExxon Research & Engineering Co.
InventorsKatsuya Arai, Satoshi Asano, Sadao Wada
Life of this patent
Estimating the term…
Abstract
A lubricating oil composition containing from 0.01 to 0.8% by weight, based on the whole composition, of a phosphoric ester and/or a phosphorous ester, from 50 to 2,000 ppm (in terms of molybdenum) of sulfurized oxymolybdenum dithiocarbamate having at least one hydrocarbyl group having 8 to 18 carbon atoms and from 0.3 to 2.5% by weight of a calcium salicylate having a total base number of 10 to 100.
Claims5
A lubricating oil composition which comprises a base oil containing:
- (A) from 0.01 to 0.8 wt %, based on the whole composition, of at least one compound selected from the group consisting of:
- (a) phosphoric esters of the general formula ##STR10## wherein R.sup.1, R.sup.2 and R.sup.3 may be the same or different and each represents a hydrogen atom or a hydrocarbyl group having 3 to 23 carbon atoms, with the proviso that at least one of R.sup.1 to R.sup.3 is a hydrocarbyl group having 3 to 23 carbon atoms, and
- (b) phosphorous esters of the general formula:
- ##STR11## wherein R.sup.4, R.sup.5 and R.sup.6 may be the same or different and each represents a hydrogen atom or a hydrocarbyl group having 3 to 23 carbon atoms, with the proviso that at least one of R.sup.4 to R.sup.6 is a hydrocarbyl group having 3 to 23 carbon atoms;
- (B) from 50 to 2,000 ppm in terms of molybdenum, based on the whole composition of sulfurized oxymolybdenum dithiocarbamate having at least one hydrocarbyl group having 8 to 18 carbon atoms, and
- (C) from 0.3 to 2.5% by weight, based on the whole composition, of a calcium salicylate having a total base number of 10 to 100.
3 more elements
Dependencies are inferred from the claim text.