Lubricating composition

Abstract

The present invention provides the use of a lubricating composition for improving anti-foaming properties, in particular as determined according to ASTM D892, wherein the lubricating composition comprises (i) a base oil comprising Fischer-Tropsch derived base oil and (ii) from 0.0001 to 10 wt % of an anti-foam agent.

I claim: 
     
         1 . Use of a lubricating composition for improving anti-foaming properties, in particular as determined according to ASTM D892, wherein the lubricating composition comprises (i) a base oil comprising a Fischer-Tropsch derived base oil and (ii) from 0.0001 to 10 wt % of an anti-foam agent. 
     
     
         2 . Use according to  claim 1  wherein the anti-foam agent is selected from silicone anti-foam agents, non-silicone anti-foam agents and mixtures thereof. 
     
     
         3 . Use according to  claim 2  wherein the silicone anti-foam agents are selected from silicone oils. 
     
     
         4 . Use according to  claim 3  wherein the silicone oils are selected from polyalkylsiloxanes (e.g., polydimethylsiloxane), polyarylsiloxanes, polyalkoxysiloxanes, polyaryloxysiloxanes, fluorinated polysiloxanes (e.g., trifluoropropylmethylsilicone), and mixtures thereof. 
     
     
         5 . Use according to  claim 1 , wherein the anti-foam agent comprises silica particulates. 
     
     
         6 . Use according to  claim 2  wherein the non-silicone anti-foam agents are selected from polymethacrylates. 
     
     
         7 . Use according to  claim 1  wherein the Fischer-Tropsch derived base oil has a kinematic viscosity at 100° C. of from 1 mm 2 /s to 35 mm 2 /s. 
     
     
         8 . Use according to  claim 1  wherein the base oil comprises more than 50 wt %, preferably more than 60 wt %, more preferably more than 70 wt %, even more preferably more than 80 wt %, most preferably more than 90 wt % of Fischer-Tropsch derived base oil. 
     
     
         9 . Method for improving anti-foaming properties of a lubricating composition, in particular as determined according to ASTM D892, wherein the method comprises providing a lubricating composition which comprises (i) a base oil comprising a Fischer-Tropsch derived base oil and (ii) 0.0001 to 10 wt % of an anti-foam agent. 
     
     
         10 . A lubricating oil composition comprising (i) a base oil comprising a Fischer-Tropsch derived base oil; and (ii) from 0.0001 to 10 wt % of an anti-foam agent.