Sulphur-containing additives to lubricants with antiwear and extreme-pressure effect and the processes for their preparation and compositions containing the said additives
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United States of America Patent
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Nov 5, 1991
Grant Date -
N/A
app pub date -
May 14, 1990
filing date -
May 18, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This invention relates to additives to lubricants with antiwear and extreme-pressure effect consisting of asymmetric dihydrocarbyl polysulphides containing a hydrocarbyl polysulphide group R-S.sub.x - in a vicinal position of a secondary or tertiary alcohol, and to lubricating compositions containing these additives. The additives are prepared by reaction of a basic salt of a hydrocarbyl (poly)sulphide either with a compound containing at least one epoxy group or with an alpha-hydroxylated organic thiosulphate.
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