Thermally stable antifoam agent for use in automatic transmission fluids
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United States of America Patent
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Aug 29, 2006
Grant Date -
May 20, 2004
app pub date -
Nov 19, 2002
filing date -
Nov 19, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Antifoam compositions for automatic transmission 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 unwanted noise in an automobile transmission during operation, comprising lubricating the transmission with an ATF containing the antifoam compositions of the invention.
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