High temperature lubricant compositions

Abstract

A lubricant composition useful for high temperature applications is provided comprising at least one polyol polyester derived from the reaction product of a neopentyl polyol with 5,7,7-trimethyl-2-(1,3,3-trimethylbutyl)-octanoic acid. The lubricants have low evaporation loss, high resistance to oxidation, and provide reduced deposits when utilized alone or in combination with other materials.

1 . A lubricant composition comprising at least one polyol polyester, wherein the polyol polyester comprises a reaction product of:
 a) at least one neopentyl polyol, and   b) 5,7,7-trimethyl-2-(1,3,3-trimethylbutyl)-octanoic acid or a reaction product, mixture, or copolymer thereof, or a further reaction product, further mixture or further copolymer of the reaction product.   
   
   
       2 . The lubricant composition of  claim 1 , wherein the neopentyl polyol is selected from the group consisting of neopentyl glycol, trimethylolpropane, trimethylolethane, monopentaerythritol, ditrimethylolpropane, dipentaerythritol, tripentaerythritol, and tetrapentaerythritol. 
   
   
       3 . The lubricant composition of  claim 1 , wherein the reaction product is a base oil in the composition and the composition further comprises at least one additional base oil. 
   
   
       4 . The lubricant composition of  claim 3 , wherein the base oil is from about 1 to about 95 percent by weight of the lubricant composition and the additional base oil is about 1 to 95 percent of the lubricant composition. 
   
   
       5 . The lubricant composition of  claim 3 , wherein the base oil is from about 5 to about 50 percent by weight of the lubricant composition and the additional base oil is about 50 to 90 percent of the lubricant composition. 
   
   
       6 . The lubricant composition of  claim 3 , wherein the additional base oil is selected from the group consisting of synthetic esters, polyesters, complex polyol polyester polymers, poly α-olefins, polymer esters, alkylated naphthalenes, polyalkylene glycols, silicones, phosphate esters, alkylated aromatics, silahydrocarbons, phosphazenes, polyphosphazenes, dialkylcarbonates, cycloaliphatics, polybutenes, alkyldiphenyl ethers, polyphenyl ethers, mineral oils, hydrocarbon oils, triglyceride oils, vegetable oils, fatty acids having a primary carbon chain length of about 5 to about 54 carbon atoms, and copolymers, mixtures, derivatives, and combinations thereof. 
   
   
       7 . The lubricant composition of  claim 4 , wherein the additional base oil is a synthetic ester selected from the group consisting of neopentyl polyol esters, complex polyol polyesters, alkylated naphthalenes and aromatic esters. 
   
   
       8 . The lubricant composition of  claim 4 , wherein the additional base oil is a poly α-olefin. 
   
   
       9 . The lubricant composition of  claim 1 , further comprising from about 0.5 to about 15 percent by weight based on a weight of the lubricant composition of at least one lubricant protecting additive. 
   
   
       10 . The lubricant composition of  claim 7 , wherein the lubricant protecting additive is present in the amount of up to about 5 percent by weight based on the weight of the lubricant composition. 
   
   
       11 . The lubricant composition of  claim 7 , wherein the lubricant protecting additive is selected from the group consisting of benzenamine, N-phenyl-, reaction products with 2,4,4-trimethylpentene; N-phenyl-1,1,3,3-tetramethylbutylnaphthalen-1-amine; butylated hydroxytoluene; alkylated diphenylamine; nonylated diphenylamine; styrenated diphenylamine; hindered alkylphenols; benzenepropanoic acid; 3,5-bis(1,1-dimethylethyl)-4-hydroxy-, thiodi-2,1-ethanediyl ester; benzenepropanoic acid, 3,5-bis(1,1-dimethylethyl)-4-hydroxy-, 2,2-bis[[3-[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]-1-oxopropoxy]methyl]-1,3-propanediyl ester; thiphenolic derivatives; and mixtures; derivatives; and combinations thereof. 
   
   
       12 . The lubricant composition of  claim 1 , further comprising from about 0.1 to about 10 percent by weight of at least one metal protecting additive based on a weight of the lubricant composition. 
   
   
       13 . The lubricant composition of  claim 10 , wherein the metal protecting additive is present in the amount of up to about 5 percent by weight based on the weight of the lubricant composition. 
   
   
       14 . The lubricant composition of  claim 10 , wherein the metal protecting additive is selected from the group consisting of t-butylphenyl phosphates, amines; branched alkyls of from about 11 to about 14 carbon atoms, monohexyl and dihexyl phosphates, isopropylphenylphosphates; tricresyl phosphates; trixylyl phosphates; di(n-octyl)phosphate; alkylated triphenylphosphorothionate; triphenylthiophosphate; benzotriazole; tolyltriazole; and mixtures; derivatives; and combinations thereof. 
   
   
       15 . A method of lubricating a metal surface, comprising:
 applying a lubricant composition to a metal surface, wherein the lubricant composition comprises:
 a) a reaction product of at least one neopentyl polyol and 5,7,7-trimethyl-2-(1,3,3-trimethylbutyl)-octanoic acid or a reaction product, mixture, or copolymer thereof wherein the reaction product is a base oil in the composition, 
 b) from about 0.5 to about 15 percent by weight of at least one lubricant protecting additive, and 
 c) from about 0.1 to about 10 percent by weight of at least one metal protecting additive. 
   
   
   
       16 . The method of lubricating, according to  claim 15 , wherein the lubricant composition further comprises at least one additional base oil. 
   
   
       17 . The method of lubricating, according to  claim 16 , wherein the lubricant composition comprises about 5 to about 50 percent of the reaction product (a) and about 50 to about 90 percent of the at least one additional base oil. 
   
   
       18 . A method of making a lubricant composition, comprising reacting
 a) at least one neopentyl polyol and   b) 5,7,7-trimethyl-2-(1,3,3-trimethylbutyl)-octanoic acid or a reaction product, mixture, or copolymer thereof, wherein the reaction product is a base oil in the composition.   
   
   
       19 . The method of  claim 18 , further comprising providing at least one additional base oil. 
   
   
       20 . The method of  claim 19 , wherein the base oil is from about 5 to about 50 percent by weight of the lubricant composition and the additional base oil is about 50 to 90 percent of the lubricant composition. 
   
   
       21 . The method of  claim 14 , further comprising providing from about 0.5 to about 15 percent by weight based on a weight of the lubricant composition of at least one lubricant protecting additive. 
   
   
       22 . The method of  claim 14 , further comprising providing from about 0.1 to about 10 percent by weight based on a weight of the lubricant composition of at least one metal protecting additive.