Lubricants having an overbased metal salts and organic phosphites
OwnerJames N. Vinciinventor
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Abstract
This invention relates to a lubricant comprising (A) a basic metal salt of an acidic organic compound and (B) a hydrocarbyl phosphite, provided that the lubricant is free of metal deactivators. In one aspect the lubricant is a manual transmission fluid. The lubricants provide good friction, good antiwear and thermal stability properties.
Claims19
A lubricating composition comprising a major amount of an oil of lubricating viscosity and (A) a basic salt of [an acidic organic compound] an organic sulfonic acid or organic acylating agent;
- (B) a hydrocarbyl phosphite represented by the formula
- (R5))3P
- and (C) a friction modifier is a glycerol ester or a borated glycerol ester, wherein each R5 is independently hydrogen or a hydrocarbyl group and at least one R5 is hydrocarbyl, provided that the lubricant is free of metal deactivators, wherein the basic metal salt (A) is an overbased material and the ratio of equivalents of overbased material based on the total base number to equivalents of hydrocarbyl phosphite based on phosphorus atoms is at least one.
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A lubricating composition comprising a major amount of an oil of lubricating viscosity and (A) from about 0.02% to about 5% by weight a basic salt of [an acidic organic compound] an organic sulfonic acid or organic acylating agent;
- (B) a hydrocarbyl phosphite represented by the formula
- (R5))3P
- and (C) from about 0.05% to about 1% by weight a friction modifier is a glycerol ester or a borated glycerol ester,
- wherein each R5 is independently a hydrocarbyl group of about 2 to about 8 carbon atoms, wherein (B) is present in an amount to deliver from about 0.01% to about 0.03% by weight phosphorus to the composition, wherein the basic metal salt (A) is an overbased material and the ratio of equivalents of overbased material based on the total base number to equivalents of hydrocarbyl phosphite based on phosphorus atoms is at least one, provided that the lubricant is free of metal deactivators.
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A lubricating composition prepared by blending a major amount of an oil of lubricating viscosity and (A) a basic salt of [an acidic organic compound] an organic sulfonic acid or organic acylating agent;
- (B) a hydrocarbyl phosphite represented by the formula
- (R5))3P
- and (C) a friction modifier is a glycerol ester or a borated glycerol ester,
- wherein each R5 is independently hydrogen or a hydrocarbyl group and at least one R5 is hydrocarbyl, provided that the lubricant is free of metal deactivators, wherein the basic metal salt (A) is an overbased material and the ratio of equivalents of overbased material based on the total base number to equivalents of hydrocarbyl phosphite based on phosphorus atoms is at least one.
Dependencies are inferred from the claim text.