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AssigneeGeneral Motors Corporation
InventorsReuben Sarkar, Brent D. Calcut, Thomas J. Chapaton, Marie-Christine G. Jones
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Antifoam compositions for functional fluids contain antifoam agents comprising perfluoropolyether compounds (PFPE). An automatic transmission fluid is provided containing the antifoam composition in a lubricating base oil, along with conventional additives such as antiwear agents. Automobile transmissions are provided that contain an automatic transmission fluid containing the new antifoam compositions. In a further embodiment, methods are provided for reducing foam in an engine oil or unwanted noise in an automobile transmission during operation, comprising lubricating the engine or transmission with a lubricating fluid containing the antifoam compositions of the invention.
A rubber composition comprising:
An automatic transmission comprising a housing defining a lubricant sump, and further comprising a rubber composition installed in the lubricant sump, wherein the rubber composition comprises
An engine comprising a crankcase defining a lubricant sump, and further comprising a rubber composition installed in the lubricant sump, wherein the rubber composition comprises
Dependencies are inferred from the claim text.