Composition for low temperature

Abstract

Lubricant composition comprising a dicarboxylic acid ester component which is formed from a dicarboxylic acid selected from the list consisting of adipic acid, phthalic acid, pimilic acid, suberic acid, azelaic acid and sebacic acid, and mixtures thereof and a branched aliphatic alcohol R—OH which is defined according to the following formula (I) whereas q, r and s are defined as follows, q+r=4 to 9, s=0 to 5, q=1 to 8, and r=1 to 6, and an ethylene-propylene copolymer.

1 .- 10 . (canceled) 
     
     
         11 . A lubricant composition comprising based on the total weight of the lubricant composition
 a) 35 to 95 wt.-% of a dicarboxylic acid ester component which is selected from diisononyladipate (DNA) and di-(2-ethylhexyl)adipate (DOA),   b) 5 to 30 wt.-% of an ethylene-propylene copolymer, and   c) 5 to 25 wt.-% of a monocarboxylic acid ester.   
     
     
         12 . The lubricant composition according to  claim 11 , wherein the lubricant composition has a kinematic viscosity according to industrial standard DIN 51562-1 of not more than 1600 mm 2 /s at −30° C. and of at least 7.5 mm 2 /s at 100° C. 
     
     
         13 . The lubricant composition according to  claim 11 , having a viscosity index according to the industrial standard DIN ISO 2909 of at least 160. 
     
     
         14 . The lubricant composition according to  claim 11 , wherein the dicarboxylic acid ester has a kinematic viscosity according to DIN 51562-1 in the range of 2 to 15 mm 2 /s at 100° C. 
     
     
         15 . The lubricant composition according to  claim 11 , wherein the ethylene-propylene copolymer has a kinematic viscosity according to JIS K 2283 at 100° C. in the range of from 1000 to 2200 mm 2 /s. 
     
     
         16 . The lubricant composition according to  claim 11 , further comprising a base oil component having a kinematic viscosity according to DIN 51562-1 at 100° C. in the range of from 1 to 5 mm 2 /s. 
     
     
         17 . The lubricant composition according to  claim 11 , wherein the monocarboxylic acid ester is selected from the list consisting of 2-ethylhexyloleate, 2-ethylhexylcocoate, 2-ethylhexylpalmitate, 2-ethylhexylstearate, 2-ethylhexyltallowate, and mixtures thereof. 
     
     
         18 . The lubricant composition according to  claim 11 , wherein the ratio of the dicarboxylic acid ester component to the oligomeric copolymers in the lubricant compositions according to the present invention is in the range of from 2:1 to 19:1 based on the relative weight of these components in the lubricant compositions according to the present invention. 
     
     
         19 . The lubricant composition according to  claim 11 , further comprising an additive component which is present in an amount of 0.1 to 20 wt % of the total lubricant composition. 
     
     
         20 . A vehicle transmission oil, axle oil, industrial transmission oil, industrial gear oil, compressor oil, turbine oil, hydraulic oil or motor oil which comprises the lubricant composition according to  claim 11 .