Antifoaming agents for lubricating oils (law455)
AssigneeExxon Research & Engineering Co.
InventorsLilianna Zofia Pillon, Andre Ernest Asselin
Life of this patent
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Abstract
A combination of a fluorosilicone antifoamant and a polyacrylate antifoamant have been found to be effective in reducing foaming of lubricating oils at both low and high temperatures and without degrading the air release time to the extent that would occur with a conventional silicone antifoamant. Neither type of antifoamant is effective in reducing foaming at both low and high temperatures by itself.
Claims4
A method for reducing foaming of a hydrocarbon oil at both low and high temperatures and without degrading the air release time to the extent that would occur with a silicone antifoamant which comprises adding a minor amount of a combination fluorosilicone antifoamant and a polyacrylate antifoamant to said oil, the combination being used in an amount of less than 1 wt % based on said oil and the weight ratio of the fluorosilicone antifoamant to the polyacrylate antifoamant ranging between about 1:150 to 1:5.
Dependencies are inferred from the claim text.