US2004121921A1PendingUtilityA1

Thermally stable antifoam agent and methods for use in functional fluids

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Priority: Dec 20, 2002Filed: Dec 20, 2002Published: Jun 24, 2004
Est. expiryDec 20, 2022(expired)· nominal 20-yr term from priority
Inventors:Brent CalcutThomas J. ChapatonReuben SarkarMarie-Christine G. Jones
C10N 2040/25C10N 2030/06C10M 2219/106C10M 2215/28C10M 2207/28C10N 2030/18C10M 147/04C10M 2215/08C10M 169/044C10N 2040/252C10M 2205/0285C10N 2040/255C10M 2207/02C10M 2229/02C10M 2205/0206C10M 2207/10C10M 2223/04
40
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Claims

Abstract

A functional fluid contains conventional additives in addition to an antifoam composition. The antifoam compositions contain perfluoropolyether compounds (PFPE). An exemplary functional fluid is an engine oil and engines containing such new engine oil as per the invention exhibit reduced foaming and improved performance. A method of treating the engines comprises adding to the lubricating composition in the sump a top treat composition comprising an antifoam composition of the invention.

Claims

exact text as granted — not AI-modified
We claim:  
     
         1 . An functional fluid comprising: 
 a) a lubricating oil;    b) an antiwear agent; and    c) an antifoam composition comprising a perfluoropolyether compound.    
     
     
         2 . A fluid according to  claim 1 , wherein the perfluoropolyether compound comprises a plurality of —(C a F 2a O)— repeating units, wherein a is from 1 to 10.  
     
     
         3 . A fluid according to  claim 1 , wherein the perfluoropolyether comprises repeating units of —(CF 2 —CF(CF 3 )—O)—.  
     
     
         4 . A fluid according to  claim 1 , wherein the perfluoropolyether comprises repeating units of —(CF 2 —CF 2 —CF 2 —O)—.  
     
     
         5 . A fluid according to  claim 1 , wherein the perfluoropolyether comprises repeating units of —(CF 2 —CF 2 —O)—.  
     
     
         6 . A fluid according to  claim 1 , wherein the perfluoropolyether comprises repeating units of —(C b F 2b O)— and —(CF 2 —O)—, wherein b is 2-10.  
     
     
         7 . A fluid according to  claim 2 , wherein the perfluoropolyether further comprises one or more functional groups selected from the group consisting of alkyl amide, silane, phosphate, carboxyl, ester, and hydroxyl.  
     
     
         8 . A fluid according to  claim 1 , wherein the fluid comprises 0.0005% to 1% by weight of the perfluoropolyether compound.  
     
     
         9 . A fluid according to  claim 8 , comprising an engine oil meeting or exceeding the minimum requirements of API service classification SF.  
     
     
         10 . A fluid according to  claim 8 , comprising an engine oil meeting or exceeding the minimum requirements of API service classification SJ.  
     
     
         11 . A fluid according to  claim 8 , comprising an engine oil meeting or exceeding the minimum requirements of API service classification CE, CF, or CG.  
     
     
         12 . An engine comprising a crankcase and engine block defining a lubricant sump, wherein the lubricant sump contains a lubricating oil composition comprising: 
 a) a lubricating oil;    b) an antiwear agent; and    c) an antifoam composition comprising a perfluoropolyether compound.    
     
     
         13 . An engine according to  claim 12 , wherein the perfluoropolyether compound comprises a plurality of —(C a F 2a O) repeating units, wherein a is from 1 to 10.  
     
     
         14 . An engine according to  claim 12 , wherein the perfluoropolyether comprises repeating units of (CF 2 —CF(CF 3 )—O)—.  
     
     
         15 . An engine according to  claim 12 , wherein the perfluoropolyether comprises repeating units of —(CF 2 —CF 2 —CF 2 —O)—.  
     
     
         16 . An engine according to  claim 12 , wherein the perfluoropolyether comprises repeating units of —(C b F 2b O)— and —(CF 2 —O)—, wherein b is 2-10.  
     
     
         17 . An engine according to  claim 13 , wherein the perfluoropolyether further comprises one or more functional groups selected from the group consisting of alkyl amide, silane, phosphate, carboxyl, ester, and hydroxyl.  
     
     
         18 . An engine according to  claim 12 , wherein the fluid comprises 0.0005% to 1% by weight of the perfluoropolyether compound.  
     
     
         19 . An engine according to  claim 12 , wherein the engine is a gasoline engine.  
     
     
         20 . An engine according to  claim 12 , wherein the engine is a diesel engine.  
     
     
         21 . A method of treating an engine, the engine comprising a crankcase and engine block defining a lubricant sump, wherein the sump contains a lubricating composition, the method comprising adding to the lubricating composition in the sump a top treat composition comprising a perfluoropolyether compound.  
     
     
         22 . A method according to  claim 21 , wherein the perfluoropolyether compound comprises a plurality of —(C a F 2a O)— repeating units, wherein a is from 1 to 10.  
     
     
         23 . A method according to  claim 21 , wherein the perfluoropolyether compound comprises repeating units of —(CF 2 —CF(CF 3 )—O)—.  
     
     
         24 . A method according to  claim 21 , wherein the perfluoropolyether compound comprises repeating units of —(CF 2 —CF 2 —CF 2 —O)—.  
     
     
         25 . A method according to  claim 21 , wherein the perfluoropolyether compound comprises repeating units of —(CF 2 —CF 2 —O)—.  
     
     
         26 . A method according to  claim 21 , wherein the perfluoropolyether compound comprises repeating units of —(C b F 2b O)— and —(CF 2 —O)—, wherein b is 2-10.  
     
     
         27 . A method according to  claim 21 , wherein the perfluoropolyether compound comprises one or more functional groups selected from the group consisting of alkyl amide, silane, phosphate, carboxyl, ester, and hydroxyl.  
     
     
         28 . A method according to  claim 21 , wherein the fluid comprises 0.0005% to 1% by weight of the perfluoropolyether compound.  
     
     
         29 . A method according to  claim 28 , wherein the engine is a gasoline engine.  
     
     
         30 . A method according to  claim 28 , wherein the engine is a diesel engine.  
     
     
         31 . A method for reducing foam in an operating engine, the engine comprising a lubricant sump containing a lubricating composition, the method comprising top treating the lubricating composition in the lubricant sump with a top treat composition comprising an antifoam compound thermally stable, as measured by differential thermal analysis, to a temperature of higher than 500° C.  
     
     
         32 . A method according to  claim 31 , wherein the top treating is carried out after assembly of the engine and before shipping the engine to an automotive assembly line.  
     
     
         33 . A method according to  claim 31 , wherein the top treating is carried out at an automotive assembly line prior to shipping the car containing the engine to a customer.  
     
     
         34 . A method according to  claim 31 , wherein the top treating is carried out during scheduled maintenance of the engine.  
     
     
         35 . A method according to  claim 31 , wherein the antifoam composition comprises a perfluoropolyether.  
     
     
         36 . A method according to  claim 35 , wherein the perfluoropolyether compound comprises a plurality of —(C a F 2a O)— repeating units, wherein a is from 1 to 10.  
     
     
         37 . A method according to  claim 35 , wherein the perfluoropolyether compound comprises repeating units of —(CF 2 —CF(CF 3 )—O)—.  
     
     
         38 . A method according to  claim 35 , wherein the perfluoropolyether compound comprises repeating units of —(C b F 2b O)— and —(CF 2 —O)—, wherein b is 2-10.  
     
     
         39 . A method according to  claim 35 , wherein the perfluoropolyether compound comprises one or more functional groups selected from the group consisting of alkyl amide, silane, phosphate, carboxyl, ester, and hydroxyl.  
     
     
         40 . A method according to  claim 35 , wherein the fluid comprises 0.0005% to 1% by weight of the perfluoropolyether compound after the top treating.

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