Aqueous fluid
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United States of America Patent
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Sep 11, 1990
Issued Date -
N/A
app pub date -
Apr 12, 1988
filing date -
Jun 27, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The use of a water-soluble hydroxyl di- or tri-carboxylic acid, generally in combination with an alkanolamine in an oil water fluid especially metal working or hydraulic fluids results in a fluid having excellent hard water compatibility, low foaming tendency in soft water and a good biostability; other additives such as emulsifiers, copper passivators and the like are generally present.
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