US2005137099A1PendingUtilityA1

Lubricating compositions

40
Assignee: FINA RESEARCHPriority: Oct 3, 1997Filed: Oct 14, 2004Published: Jun 23, 2005
Est. expiryOct 3, 2017(expired)· nominal 20-yr term from priority
Inventors:Ian FieldEtienne Tamigniau
C10M 2207/2835C10M 2207/027C10N 2030/02C10M 2223/04C10M 2203/1025C10N 2040/25C10M 129/74C10M 2215/042C10M 2205/026C10N 2030/52C10M 2207/26C10M 129/10C10M 133/08C10M 2203/1045C10N 2040/28C10M 2205/028C10M 2203/1085C10M 2207/023C10M 2229/05C10M 2207/282C10M 105/38C10N 2020/02C10M 2203/1065C10M 2219/106C10M 2207/283C10M 2203/06C10M 2207/34C10M 101/02C10M 2207/281C10M 2229/02C10M 2207/286C10M 2207/026C10M 143/12C10N 2040/251C10M 2205/04C10N 2040/255C10N 2040/253C10N 2040/252C10M 2205/06C10M 2203/1006C10M 169/04C10M 2223/042C10M 159/20
40
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Claims

Abstract

A synthetic ester-containing lubricant with good soot-handling and, with friction modifier, viscosity modifier and antioxidant present, improved engine performance and cleanliness.

Claims

exact text as granted — not AI-modified
1 - 75 . (canceled)  
     
     
         76 . A method of improving the ability of a lubricant composition to retain particulate products of fuel combustion in suspension, the method comprising adding to the lubricant from 5 to 50% by weight, based on the total weight of the composition, of an ester effective to improve the ability of the composition to retain said particulate products in suspension, the ester being an ester of a carboxylic acid, having at most 30 carbon atoms, and an alcohol, the ester being substantially free from unreacted alcohol moieties and having a molecular weight within the range of from 400 to 5000.  
     
     
         77 . The method as claimed in  claim 76 , wherein the composition contains from 10 to 40% of the ester.  
     
     
         78 . The method as claimed in  claim 76 , wherein the composition contains from 15 to 30% of the ester.  
     
     
         79 . The method as claimed in  claim 76 , wherein the molecular weight of the ester is at least 450.  
     
     
         80 . The method as claimed in  claim 76 , wherein the molecular weight of the ester is within the range of from 500 to 750.  
     
     
         81 . The method as claimed in  claim 76 , wherein the ester is an ester of a polyhydric alcohol and a monocarboxylic acid.  
     
     
         82 . The method as claimed in  claim 76 , wherein the ester is an ester of trimethylol propane and a mixture of C8 to C10 alkanoic acids.  
     
     
         83 . The method as claimed in  claim 76 , wherein the composition is a crankcase lubricant.  
     
     
         84 . The method as claimed in  claim 76 , wherein the composition is a compression-ignited engine crankcase lubricant.  
     
     
         85 . The method as claimed in  claim 76  wherein the composition comprises an API Group III base stock.  
     
     
         86 . The method as claimed in  claim 76 , wherein the composition comprises a hydroisomerized base stock.

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