US 5,328,620 AGranted

Oil additive package useful in diesel engine and transmission lubricants

AssigneeThe Lubrizol Corporation

InventorDavid E. Ripple

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Abstract

This invention provides an oil additive composition which may be used as an additive for both diesel engine lubricants and transmission lubricants. Additives useful in diesel engine lubricants often do not meet the requirements of specific transmission lubricant specifications. Surprisingly, the inventive composition, which comprises a combination of a neutral or basic alkali metal salt of a phenol sulfurized using elemental sulfur, a metal salt of a dithiophosphoric acid, an ashless dispersant, a calcium or magnesium sulfonate detergent, and a manganese carboxylate, may be used to create lubricants for both engine and transmission use.

Claims79

Dependent claims

A lubricating composition which comprises

I. a major amount of an oil of lubricating viscosity and
II. a minor amount of an additive comprising
(A) neutral or basic calcium or magnesium salts of a sulfurized phenol formed by reacting a calcium or magnesium metal base with a sulfurized phenol which is formed by reacting elemental sulfur with a phenol of the following formula:
##STR23## wherein R.sub.1 and R.sub.2 are independently selected from the group consisting of hydrogen, and alkyl groups containing from 1 to about 20 carbon atoms, provided that R.sub.1 and R.sub.2 may not both be hydrogen;
(B) one or more metal salts of a dithiophosphoric acid of the following formula:
##STR24## wherein R.sub.3 and R.sub.4 are independently selected from the group consisting of alkyl groups of 3 to about 18 carbon atoms, aryl groups, and alkyl substituted aryl groups (considered as aryl groups for the purpose of determining the ratio of aryl to alkyl groups) having one or more alkyl substituents containing a total of 1 to 18 carbon atoms, and the metal (M) is selected from the group consisting of Group I metals, Group II metals, tin, molybdenum, manganese, and zinc, provided that the level of phosphorous in the final oil composition is in the range of about 0.05 to about 0.20 percent by weight in the composition, and further provided that the ratio between aryl groups and alkyl groups in the dithiophosphoric acid salt is between 0 and about 3;
and
(C) an ashless dispersant selected from the group consisting of
(C-1) the reaction product of a hydrocarbyl substituted succinic acylating agent with an amine characterized by the presence within its structure of at least one H--N<
group wherein said substituted succinic acylating agent consists of substituent groups and succinic groups wherein the substituent groups are derived from a polyalkene, said polyalkene being characterized by a Mn value of about 750 to about 5000 and an Mw/Mn value of about 1.5 to about 4, said acylating agents being further characterized by the presence within their structure of an average of at least 1.0 succinic groups for each equivalent weight of substituent groups,
(C-2) a mannich dispersant,
(C-3) an ester dispersant,
(C-4) a mixture of C-1, C-2, or C-3,
(D) a calcium or magnesium neutral or overbased sulfonate detergent, or mixtures thereof, and
(E) a manganese carboxylate provided that the TBN contributed by the dispersant is between 0 and about 1.5 and the sulfated ash is 1.5 to 3%.

12 more elements

Dependencies are inferred from the claim text.

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Abstract

A lubricating composition which comprises

I. a major amount of an oil of lubricating viscosity and
II. a minor amount of an additive comprising
(A) neutral or basic calcium or magnesium salts of a sulfurized phenol formed by reacting a calcium or magnesium metal base with a sulfurized phenol which is formed by reacting elemental sulfur with a phenol of the following formula:
##STR23## wherein R.sub.1 and R.sub.2 are independently selected from the group consisting of hydrogen, and alkyl groups containing from 1 to about 20 carbon atoms, provided that R.sub.1 and R.sub.2 may not both be hydrogen;
(B) one or more metal salts of a dithiophosphoric acid of the following formula:
##STR24## wherein R.sub.3 and R.sub.4 are independently selected from the group consisting of alkyl groups of 3 to about 18 carbon atoms, aryl groups, and alkyl substituted aryl groups (considered as aryl groups for the purpose of determining the ratio of aryl to alkyl groups) having one or more alkyl substituents containing a total of 1 to 18 carbon atoms, and the metal (M) is selected from the group consisting of Group I metals, Group II metals, tin, molybdenum, manganese, and zinc, provided that the level of phosphorous in the final oil composition is in the range of about 0.05 to about 0.20 percent by weight in the composition, and further provided that the ratio between aryl groups and alkyl groups in the dithiophosphoric acid salt is between 0 and about 3;
and
(C) an ashless dispersant selected from the group consisting of
(C-1) the reaction product of a hydrocarbyl substituted succinic acylating agent with an amine characterized by the presence within its structure of at least one H--N<
group wherein said substituted succinic acylating agent consists of substituent groups and succinic groups wherein the substituent groups are derived from a polyalkene, said polyalkene being characterized by a Mn value of about 750 to about 5000 and an Mw/Mn value of about 1.5 to about 4, said acylating agents being further characterized by the presence within their structure of an average of at least 1.0 succinic groups for each equivalent weight of substituent groups,
(C-2) a mannich dispersant,
(C-3) an ester dispersant,
(C-4) a mixture of C-1, C-2, or C-3,
(D) a calcium or magnesium neutral or overbased sulfonate detergent, or mixtures thereof, and
(E) a manganese carboxylate provided that the TBN contributed by the dispersant is between 0 and about 1.5 and the sulfated ash is 1.5 to 3%.

12 more elements