US2004242433A1PendingUtilityA1

Low-phosphorus lubricating oil composition for extended drain intervals

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Assignee: CHEVRON ORONITE COPriority: Oct 31, 2002Filed: Apr 28, 2004Published: Dec 2, 2004
Est. expiryOct 31, 2022(expired)· nominal 20-yr term from priority
Inventors:Stephen H. RobyRichard A. MayerSusanne G. Ruelas
C10M 163/00C10N 2010/12C10M 2227/09C10N 2010/04C10M 2207/027C10M 2219/044C10N 2060/00C10M 2223/02C10M 2215/28C10M 2219/066C10M 2219/046C10M 2207/028C10M 2223/06C10M 2205/0206C10N 2030/42C10M 2223/045C10M 2215/064C10M 2207/2835C10N 2030/10C10M 2203/1006C10N 2030/06C10N 2040/25C10N 2060/14
46
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Claims

Abstract

The present invention is directed to a lubricating oil composition comprising a major amount of a base oil of lubricating viscosity and a minor amount of each of the following: a) from about 3.0 to about 7.0 weight percent of an ethylene carbonated-treated ashless dispersant; b) from about 2.0 to about 5.0 weight percent of a borated-treated ashless dispersant; c) from about 1.0 to about 3.0 weight percent of a high overbased metal-containing detergent; and d) from about 0.1 to about 2.0 weight percent of a phosphorus-containing compound; wherein the weight percent of total phosphorus in the lubricating oil composition is no more than 0.05 weight percent based on the total weight of the lubricating oil composition.

Claims

exact text as granted — not AI-modified
What is claimed is:  
     
         1 . A lubricating oil composition comprising a major amount of a base oil of lubricating viscosity and aminor amount of each of the following: 
 a) from about 3.0 to about 7.0 weight percent of an ethylene carbonated-treated ashless dispersant;    b) from about 2.0 to about 5.0 weight percent of a borated-treated ashless dispersant;    c) from about 1.0 to about 3.0 weight percent of a high overbased metal-containing detergent; and    d) from about 0.1 to about 2.0 weight percent of a phosphorus-containing compound;    wherein the weight percent of total phosphorus in the lubricating oil composition is no more than 0.05 weight percent based on the total weight of the lubricating oil composition.    
     
     
         2 . The lubricating oil composition according to  claim 1 , further comprising from about 0.2 to about 6.0 weight percent of a low overbased metal-containing detergent.  
     
     
         3 . The lubricating oil composition according to  claim 1 , further comprising from about 0.5 to about 3.0 weight percent of a nitrogen-containing ashless antioxidant.  
     
     
         4 . The lubricating oil composition according to  claim 1 , further comprising from about 0.3 to about 1.0 weight percent of an alkylthiocarbamoyl compound.  
     
     
         5 . The lubricating oil composition according to  claim 1 , further comprising from about 0.1 to about 1.5 weight percent of a molybdenum/nitrogen complex.  
     
     
         6 . The lubricating oil composition according to  claim 1  wherein the base oil of lubricating viscosity is selected from the group consisting of a Group III base stock, Group IV base stock, Group V base stock and any mixture thereof.  
     
     
         7 . The lubricating oil composition according to  claim 1  wherein the ashless dispersant is selected from the group consisting of an alkenyl succinimide, an alkenyl succinic anhydride, an alkenyl succinate ester, benzylamine or mixtures thereof.  
     
     
         8 . The lubricating oil composition according to  claim 7  wherein the ashless dispersant is an alkenyl succinimide.  
     
     
         9 . The lubricating oil composition according to  claim 8  wherein the alkenyl succinimide is a polyalkylene succinimide.  
     
     
         10 . The lubricating oil composition according to  claim 9  wherein the polyalkylene succinimide is a polyisobutylene succinimide.  
     
     
         11 . The lubricating oil composition according to  claim 1  wherein the metal-containing detergent is a metal phenate or metal sulfonate.  
     
     
         12 . The lubricating oil composition according to  claim 11  wherein the metal-containing detergent is a metal sulfonate.  
     
     
         13 . The lubricating oil composition according to  claim 1  wherein the phosphorus-containing compound is selected from the group consisting of metal dithiophosphates, phosphorus esters, amine phosphates and amine phosphinates, sulfur-containing phosphorus esters, phosphoramides and phosphonamides.  
     
     
         14 . The lubricating oil composition of  claim 13  wherein the phosphorus esters are selected from the group consisting of phosphates, phosphonates, phosphinates, phosphine oxides, phosphites, phosphonites, phosphinites, and phosphines.  
     
     
         15 . The lubricating oil composition of  claim 13  wherein the sulfur-containing phosphorus esters are selected from the group consisting of phosphoro monothionate and phosphoro dithionates.  
     
     
         16 . The lubricating oil composition of  claim 13  wherein the phosphorus-containing compound is a metal dithiophosphate.  
     
     
         17 . The lubricating oil composition of  claim 16  wherein the metal dithiophosphate is a zinc dialkyldithiophosphate.  
     
     
         18 . The lubricating oil composition of  claim 3 , wherein the nitrogen-containing ashless antioxidant is a diphenylamine type.  
     
     
         19 . The lubricating oil composition of  claim 18 , wherein the diphenylamine is an alkylated diphenylamine.  
     
     
         20 . The lubricating oil composition of  claim 4  wherein the alkylthiocarbamoyl compound is an alkylene bis(dialkyldithiocarbamate).  
     
     
         21 . The lubricating oil composition of  claim 20  wherein the alkylene bis(dialkyldithiocarbamate) is methylene bis(dialkyldithiocarbamate).  
     
     
         22 . The lubricating oil composition of  claim 21  wherein the methylene bis(dialkyldithiocarbamate) is methylene bis(dibutyldithiocarbamate).  
     
     
         23 . The lubricating oil composition of  claim 5  wherein the molybdenum/nitrogen complex contains a basic nitrogen-containing compound having at least one basic nitrogen.  
     
     
         24 . The lubricating oil composition of  claim 23  wherein the basic nitrogen-containing compound employed in the molybdenum/nitrogen complex is selected from the group consisting of succinimides, carboxylic acid amides, hydrocarbyl monoamines, hydrocarbon polyamines, Mannich bases, phosphoramides, thiophosphoramides, phosphonamides, dispersant viscosity index improvers, and mixtures thereof.  
     
     
         25 . The lubricating oil composition of  claim 24  wherein the basic nitrogen-containing compound is a succinimide and the molybdenum/nitrogen-containing complex is a molybdenum succinimide complex.  
     
     
         26 . The lubricating oil composition of  claim 25  wherein the molybdenum succinimide complex is a sulfurized molybdenum succinimide complex.  
     
     
         27 . The lubricating oil composition of  claim 25  wherein the molybdenum succinimide complex is a non-sulfurized molybdenum succinimide complex.  
     
     
         28 . The lubricating oil composition of  claim 25  wherein the molybdenum succinimide complex is employed in an amount sufficient to provide from about 10 to about 5,000 parts per million of atomic molybdenum in the lubricating oil composition.  
     
     
         29 . A method of enhancing the life of a lubricating oil composition as evidenced by an improvement in wear, extreme pressure, oxidation, and deposit control performance, the method comprising operating an internal combustion engine with a lubricating oil composition comprising a major amount of a base oil of lubricating viscosity and a minor amount of each of the following: 
 a) from about 3.0 to about 7.0 weight percent of an ethylene carbonated-treated ashless dispersant;    b) from about 2.0 to about 5.0 weight percent of a borated-treated ashless dispersant;    c) from about 1.0 to about 3.0 weight percent of a high overbased metal-containing detergent; and    d) from about 0.1 to about 2.0 weight percent of a phosphorus-containing compound;    wherein the weight percent of total phosphorus in the lubricating oil composition is no more than 0.05 weight percent based on the total weight of the lubricating oil composition.    
     
     
         30 . The method according to  claim 29 , further comprising from about 0.2 to about 0.6 weight percent of a low overbased metal-containing detergent.  
     
     
         31 . The method according to  claim 29 , further comprising from about 0.5 to about 3.0 weight percent of a nitrogen-containing ashless antioxidant.  
     
     
         32 . The method according to  claim 29 , further comprising from about 0.3 to about 1.0 weight percent of an alkylthiocarbamoyl compound.  
     
     
         33 . The method according to  claim 29 , further comprising from about 0.3 to about 1.5 weight percent of a molybdenum/nitrogen complex.  
     
     
         34 . The method according to  claim 33  wherein the molybdenum/nitrogen complex is a molybdenum-succinimide complex.

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