US2004087451A1PendingUtilityA1

Low-phosphorus lubricating oil composition for extended drain intervals

43
Priority: Oct 31, 2002Filed: Oct 31, 2002Published: May 6, 2004
Est. expiryOct 31, 2022(expired)· nominal 20-yr term from priority
Inventors:Stephen H. RobyRichard A. MayerSusanne G. Ruelas
C10N 2030/42C10M 2223/06C10M 2203/1006C10M 2223/045C10M 2215/064C10N 2040/25C10M 2215/28C10N 2030/06C10M 2219/044C10M 2207/027C10M 163/00C10M 2219/046C10M 2227/09C10N 2010/04C10N 2030/10C10N 2010/12C10M 2207/2835C10M 2219/066C10N 2060/00C10N 2060/14C10M 2205/0206C10M 2223/02C10M 2207/028
43
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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; wherein the weight ratio of a) to b) is about 0.3 to about 0.5; c) from about 1.0 to about 3.0 weight percent of a high overbased metal-containing detergent; 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 0.08 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 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; 
 wherein the weight ratio of a) to b) is about 0.3 to about 0.5;  
   c) from about 1.0 to about 3.0 weight percent of a high overbased metal-containing detergent;    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 0.08 weight percent based on the total weight of the lubricating oil composition.    
     
     
         2 . A 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 . A 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 . A lubricating oil composition according to  claim 1 , further comprising from about 0.3 to about 1.0 weight percent of an alkylthiocarbamoyl compound.  
     
     
         5 . A lubricating oil composition according to  claim 1 , further comprising from about 0.1 to about 1.5 weight percent of a molybdenum-succinimide complex.  
     
     
         6 . A lubricating oil composition according to  claim 1  wherein the total phosphorus in the composition is no more than 0.05 weight percent based on the total weight of the composition.  
     
     
         7 . A 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.  
     
     
         8 . A 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.  
     
     
         9 . A lubricating oil composition according to  claim 8  wherein the ashless dispersant is an alkenyl succinimide.  
     
     
         10 . A lubricating oil composition according to  claim 9  wherein the alkenyl succinimide is a polyalkylene succinimide.  
     
     
         11 . A lubricating oil composition according to  claim 10  wherein the polyalkylene succinimide is a polyisobutylene succinimide.  
     
     
         12 . A lubricating oil composition according to  claim 1  wherein the metal-containing detergent is a metal phenate or metal sulfonate.  
     
     
         13 . A lubricating oil composition according to  claim 12  wherein the metal-containing detergent is a metal sulfonate.  
     
     
         14 . A 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.  
     
     
         15 . The lubricating oil composition of  claim 14  wherein the phosphorus esters are selected from the group consisting of phosphates, phosphonates, phosphinates, phosphine oxides, phosphites, phosphonites, phosphinites, and phosphines.  
     
     
         16 . The lubricating oil composition of  claim 14  wherein the sulfur-containing phosphorus esters are selected from the group consisting of phosphoro monothionate and phosphoro dithionates.  
     
     
         17 . The lubricating oil composition of  claim 14  wherein the phosphorus-containing compound is a metal dithiophosphate.  
     
     
         18 . The lubricating oil composition of  claim 17  wherein the metal dithiophosphate is a zinc dialkyldithiophosphate.  
     
     
         19 . The lubricating oil composition of  claim 1 , wherein the nitrogen-containing ashless antioxidant is a diphenylamine.  
     
     
         20 . The lubricating oil composition of  claim 19 , wherein the diphenylamine is an alkylated diphenyl amine.  
     
     
         21 . The lubricating oil composition of  claim 1  wherein the alkylthiocarbamoyl compound is an alkylene bis(dialkyldithiocarbamate).  
     
     
         22 . The lubricating oil composition of  claim 21  wherein the alkylene bis(dialkyldithiocarbamate) is methylene bis(dialkyldithiocarbamate).  
     
     
         23 . The lubricating oil composition of  claim 22  wherein the methylene bis(dialkyldithiocarbamate) is methylene bis(dibutyldithiocarbamate).  
     
     
         24 . The lubricating oil composition of  claim 1  wherein the nitrogen-containing compound employed in the molybdenum/nitrogen-containing 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 nitrogen-containing compound is a succinimide and the molybdenum/nitrogen-containing complex is a molybdenum succinimide.  
     
     
         26 . The lubricating oil composition of  claim 25  wherein the molybdenum succinimide is a sulfurized molybdenum succinimide.  
     
     
         27 . The lubricating oil composition of  claim 25  wherein the molybdenum succinimide is a non-sulfurized molybdenum succinimide.  
     
     
         28 . The lubricating oil composition of  claim 25  wherein the molybdenum succinimide is employed in an amount sufficient to provide from about 10 to about 5,000 parts per million of atomic molybdenum in the lubricant 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; 
 wherein the weight ratio of a) to b) is about 0.3 to about 0.5;  
   c) from about 1.0 to about 3.0 weight percent of a high overbased metal-containing detergent;    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 0.08 weight percent based on the total weight of the lubricating oil composition.    
     
     
         30 . A 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 . A method according to  claim 29 , further comprising from about 0.5 to about 3.0 weight percent of a nitrogen-containing ashless antioxidant.  
     
     
         32 . A method according to  claim 1 , further comprising from about 0.3 to about 1.0 weight percent of an alkylthiocarbamoyl compound.  
     
     
         33 . A method according to  claim 1 , further comprising from about 0.3 to about 1.5 weight percent of a molybdenum-succinimide complex.  
     
     
         34 . A method according to  claim 1  wherein the total phosphorus in the composition is no more than 0.05 weight percent based on the total weight of the composition.

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