Use of surfactants with high molecular weight for improving the filterability in hydraulic lubricants
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United States of America Patent
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Sep 23, 2003
Grant Date -
Mar 14, 2002
app pub date -
Dec 11, 1998
filing date -
Apr 11, 1997
priority date (Note) -
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Abstract
A hydraulic oil, a predominant amount of an oil having a viscosity suitable for lubrication, and from 0.03% to 0.06% of an agent improving filterability, corresponding to the formula R--Z. Z represents an ester of succinic acid comprising the reaction product of a succinic anhydride and an aliphatic polyhydric alcohol; or a succinimide comprising the reaction product of a succinic anhydride and a polyamine, the said reaction product being treated with an after-treatment agent. R represents a polyolefin having a molecular weight (Mn) of 500 to 2500 and an Mw/Mn ratio of 1 to 5.
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