Method of improving the shear stability of lithium soap greases
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United States of America Patent
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Feb 27, 1990
Issued Date -
N/A
app pub date -
Dec 21, 1988
filing date -
Jul 31, 1987
priority date (Note) -
Expired
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Abstract
A method for improving the shear stability of a multipurpose grease containing (i) a lubricating oil, (ii) a lithium soap of an hydroxy fatty acid, (iii) a polyhydric alcohol having at least three hydroxy groups, and (iv) at least two metal hydrocarbylthiophosphate compounds in which the metal is different in at least two compounds, is disclosed which comprises incorporating at least a major portion of the polyhydric alcohol into the mixture of lubricating oil and lithium soap of an hydroxy fatty acid and before the metal hydrocarbylthiophosphate compounds are added during the grease preparation process. Preferred ingredients are 12-hydroxystearic acid, glycerol, antimony dialkyldithiophosphate, and zinc dialkyldithiophosphate.
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