Bridged Alkaline Earth Metal Alkylphenates
AssigneeThe Lubrizol Corporation
InventorsJayasooriya Sujith Perera, Gary M. Walker, Christopher J. Ciolli, Christopher L. Friend
Life of this patent
Estimating the term…
Abstract
A bridged alkaline earth metal alkylphenate having reduced monomeric alkylphenol is prepared by reacting (a) a 4-alkylphenol, unsubstituted at the ortho positions, (b) an alkaline earth metal oxide or hydroxide, (c) a bridging agent comprising sulfur or a carbonyl compound of 1 to about 6, or to 4 or to 2, carbon atoms, and (d) a 2,6-dialkylphenol. The amount of the 2,6-dialkylphenol is 0.05 to 3 moles per 1 mole of the 4-alkylphenol; if there is a molar excess of the 2,6-dialkylphenol, then the excess is added after initial reaction.
Claims20
A process for preparing a bridged alkaline earth metal alkylphenate, comprising reacting:
- (a) a 4-alkylphenol, unsubstituted at the ortho positions,
- (b) an alkaline earth metal oxide or hydroxide,
- (c) a bridging agent comprising sulfur or a carbonyl compound of 1 to about 6, or to 4 or to 2, carbon atoms, and
- (d) a 2,6-dialkylphenol;
- wherein amount of the 2,6-dialkylphenol is about 0.05 to about 3 moles (or about 0.1 to about 1.3 or about 0.25 to about 1.25 moles) per 1 mole of the 4-alkylphenol;
- provided that if there is a molar excess of the 2,6-dialkylphenol, then such excess is added after initial reaction of the 4-alkylphenol with alkaline earth oxide or hydroxide, the bridging agent, and no more than 1 mole of the 2,6-dialkylphenol per mole of the 4-alkylphenol.
A bridged alkaline earth metal alkylphenate represented by the formula
- where n is 0 to about 8;
- each M is independently hydrogen or a bond to a metal ion, provided that at least one M represents a bond to an alkaline earth metal ion;
- each R is independently an alkyl group of about 10 to about 30 carbon atoms;
- each R′ is independently an alkyl group;
- X is Sx or an alkylene group of 1 to about 4 carbon atoms, where x is 1 to about 4, or 1 to 2, or 1;
- and
- Y is H or —SH or a group represented by the formula
A lubricant composition comprising an oil of lubricating viscosity and the alkylphenate of claim 17.
The lubricant composition of claim 18 wherein the alkylphenate is present in an amount of about 0.1 to about 8 percent by weight.
The method of claim 21 wherein the mechanical device comprises an internal combustion engine.
Dependencies are inferred from the claim text.