Fluorinated polyacrylates antifoams in ultra-low viscosity (<5 CST) finished fluids

1. A lubricating composition comprising:

a) at least one oil of lubricating viscosity; and

b) an antifoam component comprising a poly(acrylate) copolymer including:

(i) from about 40 wt % up to about 80 wt % of a (meth)acrylate monomer having C 1 to C 4 alkyl esters of (meth)acrylic acid; and

(ii) from about 20 wt % up to about 60 wt % of a fluorinated (meth)acrylate monomer comprising at least one of 2,2,2-trifluoroethyl (meth)acrylate, 1,1,1,3,3,-hexafluoroisopropyl (meth)acrylate, 2,2,3,3,4,4,5,5-octafluoropentyl (meth)methacrylate, 3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,10-heptadecafluoroundecyl (meth)acrylate, 2,2,3,4,4,4-hexafluorobutyl (meth)acrylate, 3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluorooctyl (meth)acrylate, or combinations thereof;

the antifoam component having a M w of at least 1,000 Daltons; and

wherein the lubricating composition has a kinematic viscosity (“KV”) at 100° C. of equal to or less than 5 cSt.

2. The lubricating composition of claim 1 , wherein the (meth)acrylate monomer has C 1 to C 3 alkyl esters of (meth)acrylic acid.

3. The lubricating composition of claim 1 , wherein the at least one oil of lubricating viscosity is a Group I oil, Group II oil, Group III oil, Group IV oil, Group V oil, or mixtures thereof.

4. The lubricating composition of claim 3 , wherein the at least one oil of lubricating viscosity is a Group I oil, Group III oil, Group IV oil, Group V oil, or mixtures thereof.

5. The lubricating composition of claim 1 , wherein the (meth)acrylate monomer (i) comprises ethyl (meth)acrylate or propyl (meth)acrylate.

6. The lubricating composition of claim 1 , further comprising a phosphorus-containing anti-wear agent, a silicon-containing anti-foam agent, or combinations thereof.

7. The lubricating composition of claim 6 , comprising dialkyl hydrogen phosphite, poly dialkylsiloxane, or combinations thereof.

8. The lubricating composition of claim 6 , comprising dialkyl hydrogen phosphite, poly dialkylsiloxane, and/or fluorinated poly dialkylsiloxane.

9. The lubricating composition of claim 6 , comprising dibutyl phosphite.

10. The lubricating composition of claim 1 , wherein the (meth)acrylate monomer (i) is ethyl acrylate and the fluorinated (meth)acrylate monomer (ii) is 3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluorooctyl (meth)acrylate.

11. The lubricating composition of claim 1 , wherein the antifoam component has a M w of from about 10,000 Da to about 350,000 Da.

12. The lubricating composition of claim 1 , wherein the antifoam component is present in the lubricating composition in an amount of at least 1 ppm.

13. The lubricating composition of claim 1 , further comprising at least one additive that is a dispersant, viscosity modifier, friction modifier, detergent, antioxidant, seal swell agent, anti-wear agent, or combinations thereof.

14. A method of lubricating a mechanical device comprising supplying to the mechanical device the lubricating composition of claim 1 .

15. The method of claim 14 , wherein the mechanical device comprises a driveline device.

16. The method of claim 15 , wherein the driveline device comprises an axle, a gear, a gearbox or a transmission.

17. The method of claim 14 wherein the mechanical device comprises an internal combustion engine.

18. The method of claim 14 , wherein the mechanical device comprises a hydraulic system, a turbine system, a circulating oil system, a refrigeration lubricant system, or an industrial gear.

19. A method of foam inhibition in a mechanical device comprising contacting the mechanical device with the lubricating composition of claim 1 .

20. The method of claim 14 or 19 , wherein the mechanical device comprises at least one silicon-containing gasket.