Use Of Polyesters As Lubricants

Abstract

The presently claimed invention is directed to the novel use of polyester obtainable by reacting a mixture comprising cyclohexane-1,2-dicarboxylic acid and an alcohol mixture comprising 1-nonanol, monomethyloctanols, dimethylheptanols and monoethylheptanols and subsequent hydrogenation of said total mixture as lubricants and a lubricant composition comprising these polyesters.

1 . Use of a polyester obtainable by reacting a total mixture comprising phthalic acid, optionally in form of its esters or its anhydrides, and an alcohol mixture comprising 1-nonanol, monomethyloctanols, dimethylheptanols and monoethylheptanols and subsequent hydrogenation of said total mixture, whereby the polyester has a dynamic viscosity at 20° C. in the range of 40 to 64 mPa·s determined according to DIN 51562-1, as lubricant. 
     
     
         2 . The use according to  claim 1 , characterized in that the polyester has a dynamic viscosity at 20° C. in the range of 42 to 62 mPa·s determined according to DIN 51562. 
     
     
         3 . The use according to  claim 1  or  2 , characterized in that the alcohol mixture contains a proportion of 25% by weight to 55% by weight monomethyloctanols, related to the overall weight of the alcohol mixture. 
     
     
         4 . The use according to one or more of  claims 1  to  3 , characterized in that the alcohol mixture contains a proportion of 10% by weight to 30% by weight dimethylheptanols, related to the overall weight of the alcohol mixture. 
     
     
         5 . The use according to one or more of  claims 1  to  4 , characterized in that the alcohol mixture contains a proportion of 6% by weight to 16% by weight 1-nonanol, 25% by weight to 55% by weight monomethyloctanols, 10% by weight to 30% by weight dimethylheptanols and 7% by weight to 15% by weight monoethylheptanols, related to the overall weight of the alcohol mixture. 
     
     
         6 . The use according to one or more of  claims 1  to  5 , characterized in that the alcohol mixture is present in a molar ratio in the range of 1:1 to 2:1 in relation to phthalic acid, optionally in form of its esters or its anhydrides. 
     
     
         7 . A lubricant composition comprising
 A) at least one lubricating base oil,   B) at least one polyester obtainable by reacting a total mixture comprising phthalic acid, optionally in form of its esters or its anhydrides, and an alcohol mixture comprising 1-nonanol, monomethyloctanols, dimethylheptanols and monoethylheptanols and subsequent hydrogenation of said total mixture, whereby the polyester has a dynamic viscosity at 20° C. in the range of 40 to 62 mPa·s determined according to DIN 51562-1 and   C) lubricating oil additives.   
     
     
         8 . The lubricant composition according to  claim 7 , characterized in that the lubricating base oil is hydrorefined mineral oil and/or synthetic hydrocarbon oil. 
     
     
         9 . The lubricant composition according to  claim 8 , characterized in that the hydrorefined mineral oil is selected from the group consisting of hydrorefined naphthenic mineral oil, API base oil classification Group II and Group III hydrorefined paraffinic mineral oil. 
     
     
         10 . The lubricant composition according to  claim 8 , characterized in that the synthetic hydrocarbon oil is selected from the group consisting of isoparaffinic synthetic oil, GTL synthetic oil and poly-α-olefin (PAO) belonging to API base oil classification Group IV. 
     
     
         11 . The lubricant composition according to one or more of  claims 7  to  10 , characterized in that the polyester has a dynamic viscosity at 20 ° C. in the range of 42 to 61 mPa·s determined according to DIN 51562-1. 
     
     
         12 . The lubricant composition according to one or more of  claims 7  to  11 , characterized in that the alcohol mixture contains a proportion of 25% by weight to 55% by weight monomethyloctanols, related to the overall weight of the alcohol mixture. 
     
     
         13 . The lubricant composition according to one or more of  claims 7  to  12 , characterized in that the alcohol mixture contains a proportion of 10% by weight to 30% by weight dimethylheptanols, related to the overall weight of the alcohol mixture. 
     
     
         14 . The lubricant composition according to one or more of  claims 7  to  13 , characterized in that the alcohol mixture contains a proportion of 6% by weight to 16% by weight 1-nonanol, 25% by weight to 55% by weight monomethyloctanols, 10% by weight to 30% by weight dimethylheptanols and 7% by weight to 15% by weight monoethylheptanols, related to the overall weight of the alcohol mixture. 
     
     
         15 . The lubricant composition according to  claim 7 , characterized in that the lubricating oil additives are selected from the group consisting of lubricity improvers, viscosity improvers, combustion improvers, corrosion and/or oxidation inhibiting agents, pour point depressing agents, extreme pressure agents, antiwear agents, antifoam agents, detergents, dispersants, antioxidants and metal passivators.