Lubricants leading to better equipment cleanliness

Abstract

The present invention relates to the field of lubricants. In particular, the present invention is directed to the use of lubricant compositions comprising a synthetic ester having an Iodine value lower than 10 g I/100 g measured according to DGF CV 11b for the reduction of deposit formation.

1 - 15 . (canceled) 
     
     
         16 . Use of a lubricating composition for reducing the formation of deposits, wherein the composition comprises
 (i) at least one lubricating base oil, and   (ii) at least one synthetic ester having an Iodine value lower than 10 g I/100 g measured according to DGF C-V 11b.   
     
     
         17 . Use according to  claim 16 , wherein the synthetic ester is selected from
 (a) a diester of a dicarboxylic acid,   (b) a polyol ester, or   (c) mixtures thereof.   
     
     
         18 . Use according to  claim 16 , wherein the diester of the dicarboxylic acid is selected form the group consisting of di-(isopropylheptyl)-adipate (DPHA), di-isodecyl adipate (DIDA), diisotridecyl adipate (DITA), diisononyladipate (DNA) or mixtures thereof. 
     
     
         19 . Use according to  claim 16 , wherein the lubricating base oil is selected from Group I, Group II, Group III base oils according to the definition of the API, or mixtures thereof. 
     
     
         20 . Use according to  claim 16 , wherein the composition further comprises one or more other additives selected from the group consisting of viscosity index improvers, polymeric thickeners, antioxidants, corrosion inhibitors, detergents, dispersants, anti-foam agents, dyes, extreme pressure additives, antiwear additives, friction modifiers, metal deactivators, pour point depressants and the like. 
     
     
         21 . Use according to  claim 16  wherein
 (a) the deposits are determined according to the TEOST MHT D7097 test, or 
 (b) the deposits are measured according to ASTM D4310. 
 
     
     
         22 . Use according to  claim 16 , wherein the oxidation stability measured according to HPDSC test is increased compared to a composition wherein the synthetic ester has been replaced by a lubricant base oil selected from Group I, Group II, Group III base oils or mixtures thereof. 
     
     
         23 . Use according to  claim 16 , wherein the Noack volatility measured according to ASTM D5800 is decreased compared to a composition wherein the synthetic ester has been replaced by a lubricant base oil selected from Group I, Group II, Group III base oils or mixtures thereof, and wherein preferably the Noack volatility is below 12% weight loss, or equal or below about 10% weight loss. 
     
     
         24 . Use according to  claim 16 , wherein the dynamic viscosity determined at −35° C. according to ASTM4684 is at least about 100 mPa*s lower compared to a formulation wherein the synthetic ester has been replaced by a lubricant base oil selected from Group I, Group II, Group III base oils or mixtures thereof. 
     
     
         25 . A lubricating composition comprising
 (i) at least one base oil selected from a Group I oil according to the API classification,   (ii) a synthetic ester having an Iodine value lower than 10 g I/100 g measured according to DGF C-V 11b, and   (iii) optional further additives.   
     
     
         26 . A lubricating composition comprising
 (i) at least one base oil selected from a Group I, Group II oil according to the API classification, or a mixture thereof   (ii) a synthetic ester having an Iodine value lower than 10 g I/100 g measured according to DGF C-V 11b,   (iii) optional further additives.   
     
     
         27 . The lubricating composition according to  claim 25 , wherein the synthetic ester is a diester of a dicarboxylic acid, and wherein preferably the diester of the dicarboxylic acid is selected from the group consisting of di-(isopropylheptyl)-adipate (DPHA), di-isodecyl adipate (DIDA), diisotridecyl adipate (DITA), diisononyladipate (DNA) or mixtures thereof, and preferably is di-(isopropylheptyl)-adipate (DPHA). 
     
     
         28 . A method for reducing deposit formation in a lubricating composition comprising a base oil comprising at least one Group I, Group II, or Group III base oil or mixtures thereof, comprising adding a synthetic ester having an Iodine value lower than 10 g I/100 g measured according to DGF C-V 11b to said lubricating composition. 
     
     
         29 . The method according to  claim 28 , wherein the synthetic ester is added after the lubricating base oil is present in the equipment. 
     
     
         30 . The method according to  claim 28 , wherein the synthetic ester is a diester of a dicarboxylic acid, and wherein preferably the diester of the dicarboxylic acid is selected from the group consisting of di-(isopropylheptyl)-adipate (DPHA), di-isodecyl adipate (DIDA), diisotridecyl adipate (DITA), diisononyladipate (DNA) or mixtures thereof, and preferably is di(isopropylheptyl)-adipate (DPHA).