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1. WO1995007964 - COMPOSITION LUBRIFIANTE CONTENANT UNE COMBINAISON D'ADDITIFS ANTI-USURE

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CLAIMS:
1. An anti-wear additive combination for use in a lubricant composition comprising:

(a) an oil-soluble or oil-dispersible phosphorus-free organo-molybdenum
compound, and
(b) an ashless, sulphur-containing organo-phosphorus compound.

2. According to claim 1 wherein the organo group of the organo-molybdenum compound is selected from, or comprises, a carbamate (which may be a molybdenum dithiocarbamate, the organo group(s) of which may be substituted by or with a hydrocarbyl group and/or one or more hetero-atoms), a carboxylate (e.g., having from 6 to 18 carbon atoms) and a xanthate group and mixtures thereof, which groups may be substituted with a hydrocarbyl group and/or one or more hetero atoms, and which organo-molybdenum compound may be nitrogen-free.

3. An additive combination according to any preceding claim wherein the ashless organo-phosphorus compound is a phosphorothiolothionate or a phosphorothionate or a mixture thereof.

4. An additive combination according to any preceding claim wherein the combination includes in addition to (a) and (b):

(c) a zinc thiophosphate compound selected from one or more of zinc dialkyldithiophosphate, zinc diaryldithiophosphate, zinc alkylaryldithiophosphate and zinc arylalkyldithiophosphate.

5. An additive concentrate comprising a carrier fluid in which the components of the additive combination of any of claims 1 to 4 is or are dispersed and/or dissolved.

6. A lubricant composition comprising a base oil of viscosity of from 3 to 26 (e.g., 3 to 20) cSt (mm^/s) at 100°C, and an anti-wear additive combination or additive concentrate according to any preceding claim.

7. A lubricant composition according to claim 6 wherein the amount of organo-molybdenum compound contained in the lubricant composition is such that the amount of molybdenum contained in the lubricant composition is from 0.001 to 0.5 wt.%, preferably 0.005 to 0.2 wt.%, based on the total weight of the lubricant composition and/or wherein the amount of ashless organo-phosphorus compound contained in the lubricant composition is such that the amount of phosphorus contained in the lubricant composition is from 0.001 to 0.3 wt.%, preferably 0.01 to 0.2 wt.%, based on the total weight of the lubricant composition.

8. A lubricant composition according to claim 6 or claim 7 wherein the ratio of organo-molybdenum compound to ashless organo-phosphorus compound in the lubricant composition is such that the weight ratio of molybdenum to phosphorus in the lubricant composition is from 1:50 to 100:1, preferably from 1:10 to 20:1.

9. A lubricant composition according to any of claims 6 to 8 wherein the amount of zinc thiophosphate compound and ashless organo-phosphorus compound contained in the lubricant composition is such that the amount of phosphorus contained in the lubricant composition is from 0.001 to 0.3 wt.%, preferably from 0.01 to 0.2 wt.%, based on the total weight of the lubricant composition and/or wherein the ratio of organo-molybdenum compound to the ashless organo-phosphorus and zinc thiophosphate compounds in the lubricant composition is such that the weight ratio of molybdenum to phosphorus in the lubricant composition is from 1:50 to 100:1, preferably from 1:10 to 20:1.

10. A lubricant composition according to any of claims 6 to 9 wherein the weight ratio of phosphorus derived from the ashless organo-phosphorus compound to phosphorus derived from the zinc thiophosphate compound is from 10:1 to 1:20, preferably from 5:1 to 1:15.

11. Use of a combination of additives as an antiwear agent in a lubricant composition, the combination of additives being in accordance with any one of claims 1 to 5.