Lubricating oil compositions

Abstract

The present application relates to biodegradable zero drip lubricating oil composition. The lubricating oil composition comprises a) an oil soluble polyalkylene glycol polymer; b) a vegetable base stock; and c) organic solvent excluding alcohol, wherein the oil soluble poly alkylene glycol and the vegetable base stock are present in a weight ratio from 1:2.6 to 1:8. The biodegradable lubricating oil compositions have high film strength, high load carrying capability, zero anti-drip property and maximum penetrability in the chain linkages, for application in roller chains and driving power trains having complex chain linkages.

We claim: 
     
         1 . A lubricating oil composition comprising:
 a) an oil soluble polyalkylene glycol polymer;   b) a vegetable base stock; and   c) an organic solvent excluding alcohol,   wherein the oil soluble polyalkylene glycol and the vegetable base stock are present in a weight ratio from 1:2.6 to 1:8.   
     
     
         2 . The lubricating oil composition as claimed in  claim 1 , further comprising tackifiers and additives. 
     
     
         3 . The lubricating oil composition as claimed in  claim 1 , wherein the oil soluble polyalkylene glycol polymer is present in the range of 10% to 18% by weight of the composition. 
     
     
         4 . The lubricating oil composition as claimed in  claim 1 , wherein the vegetable base stock is present in the range of 71% to 79% by weight of the composition. 
     
     
         5 . The lubricating oil composition as claimed in  claim 1 , wherein the organic solvent is a fast evaporating solvent with evaporation rate in the range of 6 to 9. 
     
     
         6 . The lubricating oil composition as claimed in  claim 1 , wherein the organic solvent is present in the range of 4% to 7% by weight of the composition. 
     
     
         7 . The lubricating oil composition as claimed in  claim 1 , wherein the vegetable base stock comprises at least one of castor oil, olive oil, peanut oil, rapeseed oil, corn oil, sesame oil, cotton seed oil, soybean oil, sunflower oil, hemp oil, linseed oil, tung oil, jojoba oil, lard oil and derivatives thereof. 
     
     
         8 . The lubricating oil composition as claimed in  claim 1 , wherein the organic solvent comprises at least one of oxygenated solvents, halogenated solvents and hydrocarbon solvents. 
     
     
         9 . The lubricating oil composition as claimed in  claim 7 , wherein the vegetable base stock is a hydrogenated castor oil. 
     
     
         10 . The lubricating oil composition as claimed in  claim 1 , further comprising an anti-wear agent and extreme pressure agent, a corrosion inhibitor, and a metal deactivator. 
     
     
         11 . The lubricating oil composition as claimed in  claim 1 , wherein the vegetable base stock has a kinematic viscosity in the range of 200 cSt to 300 cSt at a temperature of 40° C. 
     
     
         12 . The lubricating oil composition as claimed in  claim 1 , wherein the oil soluble polyalkylene glycol polymer has a kinematic viscosity in the range of 612 cSt to 748 cSt at a temperature of 40° C. 
     
     
         13 . The lubricating oil composition as claimed in  claim 1 , wherein the composition is free of anti-slag, flow modifier additives, or combinations thereof. 
     
     
         14 . The lubricating oil composition as claimed in  claim 1  has a viscosity index as per ASTM D 2270 of from 150 to 180.