LUBRICANT FORMULATIONS AND METHODS
The embodiments described herein relate to particular formulations and methods that provide reduced exhaust catalyst deactivation and/or reduced oil consumption.
1 . A lubricant composition comprising:
(a) a base oil having a NOACK volatility of from about 5 to about 15; and
(b) a zinc dialkyl dithio phosphate having a primary alkoxy moiety,
wherein the lubricant composition is essentially free of zinc dialkyl dithio phosphate having all-secondary alkoxy moieties.
2 . The lubricant composition of claim 1 , wherein the lubricant composition is an engine oil.
3 . The lubricant composition of claim 1 , wherein the lubricant composition is a heavy duty engine oil.
4 . The lubricant composition of claim 1 , wherein the base oil has a NOACK volatility of from about 10 to about 15.
5 . The lubricant composition of claim 4 , wherein the base oil has a NOACK volatility of from about 9 to about 13.
6 . The lubricant composition of claim 1 , wherein the base oil comprises a mineral oil, a synthetic oil, or a mixture thereof.
7 . The lubricant composition of claim 1 , wherein the base oil comprises on or more of a member selected from the group consisting of: a group I base oil, a group II base oil, a group III base oil, a group IV base oil, and a group V base oil.
8 . The lubricant composition of claim 1 , wherein the total amount of phosphorus in the lubricant composition comprises less than about 20% phosphorus derived from zinc dialkyl dithio phosphate having all-secondary alkoxy moieties.
9 . The lubricant composition of claim 1 , wherein the total amount of phosphorus in the lubricant composition comprises less than about 15% phosphorus derived from zinc dialkyl dithio phosphate having all-secondary alkoxy moieties.
10 . The lubricant composition of claim 1 , wherein the total amount of phosphorus in the lubricant composition comprises less than about 10% phosphorus derived from zinc dialkyl dithio phosphate having all-secondary alkoxy moieties.
11 . The lubricant composition of claim 1 , wherein the zinc dialkyl dithio phosphate having a primary alkoxy moiety is present in an amount sufficient to contribute from about 0.03 wt % to about 0.15 wt % phosphorus in the lubricant composition.
12 . The lubricant composition of claim 1 , wherein the lubricant composition further comprises a zinc dialkyl dithio phosphate having both primary and secondary alkoxy moieties.
13 . The lubricant composition of claim 12 , wherein the zinc dialkyl dithio phosphate having both primary and secondary alkoxy moieties is present in an amount sufficient to contribute from about 0.03 wt % to about 0.15 wt % of phosphorus in the lubricant composition.
14 . A lubricant composition comprising
(a) a base oil having a NOACK volatility of from about 5 to about 15 and
(b) the reaction product of:
(i) about 50 to about 100 mol % of about C1 to about C18 primary alcohol;
(ii) up to about 50 mol % of about C3 to about C18 secondary alcohol;
(iii) a phosphorus-containing component; and
(iv) a zinc-containing component.
15 . The lubricant composition of claim 14 , wherein the phosphorus component comprises phosphorus pentasulfide.
16 . The lubricant composition of claim 14 , wherein the zinc component comprises zinc oxide.
17 . A method for providing a decrease in catalyst deactivation in an automotive exhaust catalytic converter, comprising lubricating an engine with a lubricant composition comprising:
(a) a base oil having a NOACK volatility of from about 5 to about 15; and
(b) a zinc dialkyl dithio phosphate having a primary alkoxy moiety, wherein the lubricant composition is essentially free of zinc dialkyl dithio phosphate having all-secondary alkoxy moieties.
18 . A method for decreasing oil consumption in an engine, comprising lubricating an engine with a lubricant composition comprising:
(a) a base oil having a NOACK volatility of from about 5 to about 15; and
(b) a zinc dialkyl dithio phosphate having a primary alkoxy moiety, wherein the lubricant composition is essentially free of zinc dialkyl dithio phosphate having all-secondary alkoxy moieties.
19 . The method of claim 18 , wherein the lubricant composition decreases oil consumption compared to a lubricant composition containing zinc dialkyl dithio phosphate having all-secondary alkoxy moieties.
20 . The method of claim 18 , wherein the engine includes an internal combustion engine having a crankcase and wherein the lubricant composition comprises a crankcase oil present in the crankcase of the engine.
21 . A method for lubricating an engine, comprising:
contacting said engine with a lubricant composition wherein said lubricant composition comprises:
(a) a base oil having a NOACK volatility of from about 5 to about 15; and
(b) a zinc dialkyl dithio phosphate having a primary alkoxy moiety, wherein the lubricant composition is essentially free of zinc dialkyl dithio phosphate having all-secondary alkoxy moieties.
22 . The method of claim 21 , wherein the lubricant composition provides decreased oil consumption compared to a lubricant composition containing zinc dialkyl dithio phosphate having all-secondary alkoxy moieties.
23 . The method of claim 21 , wherein the lubricant composition provides a decrease in catalyst deactivation in an automotive exhaust catalytic converter compared to a lubricant composition containing zinc dialkyl dithio phosphate having all-secondary alkoxy moieties.