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US 12,060,537 B2Granted
Cyclic phosphonate esters for lubricant applications
AssigneeThe Lubrizol Corporation
InventorsJason J. Hanthorn, Amanda Freshwater, Christopher M. Rasik
Life of this patent
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Abstract
Lubricant compositions comprising (a) an oil of lubricating viscosity and (b) a phosphonate ester other than a zinc salt. The phosphonate ester may be the reaction product of (i) phosphonic acid or a monomeric ester thereof with (ii) a propanediol having hydroxy groups in both the 1 and 3 positions and one or more of the carbon atoms of the propyl units are substituted with one or more alkyl groups such that the total number of carbon atoms in the propanediol ranges from 4 to 12. The molar ratio of (i) to (ii) may be 0.9:1.1 to 1.1 to 0.9.
Claims21
A lubricant composition comprising:
- (a) an oil of lubricating viscosity and
- (b) a phosphonate ester other than a zinc salt, comprising the reaction product of (i) phosphonic acid and (ii) an alcohol mixture comprising a propanediol having hydroxy groups in the 1 and 3 positions and wherein one or more of the carbon atoms of the propyl units are substituted such that the total number of carbon atoms in the propanediol ranges from 4 to 12 and an alkane diol having two hydroxy groups in a 1, 4 or 1, 5 or 1, 6 relationship;
- and wherein the relative molar amounts of the propanediol and the alkane diol in the alcohol mixture are in a ratio greater than 95:5;
- and
- wherein the molar ratio of (i) to (ii) is 0.9:1.1 to 1.1:0.9.
2 more elements
Dependencies are inferred from the claim text.