Ashless antioxidant lubricating oil additive
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United States of America Patent
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Sep 24, 1996
Issued Date -
N/A
app pub date -
Jun 7, 1995
filing date -
May 28, 1991
priority date (Note) -
Expired
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Abstract
A method for producing an ashless, antioxidant lubricating oil additive. The method comprises: (a) reacting an alcohol with phosphorus pentasulfide to form a dithiophosphoric acid intermediate; (b) treating the dithiophosphoric acid intermediate with an expoxide to yield a corresponding dithiophosphoric ester alcohol product; and (c) recovering the dithiophosphoric ester alcohol product lubricant oil additive.
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