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US 10,829,713 B2Granted
Nitrogen-free phosphorus compounds and lubricants containing the same
OwnerWilliam D. Abraham, Mahmud M. Hussain +1inventors
InventorsWilliam D. Abraham, Mahmud M. Hussain, Kurt F. Wollenberg
Life of this patent
Estimating the term…
Abstract
A composition obtained by reacting an O,O′-dialkyldithiophosphoric acid with a hydroxyalkyl acrylate or a hydroxyalkyl methacrylate, and reacting the product thereof with a dialkylphosphite provides good antiwear protection.
Claims21
A composition comprising a material represented by the formula
- wherein R1 and R2 are each independently hydrocarbyl groups of 3 to about 12 carbon atoms, or are groups represented by
- or wherein R1 and R2 together with the adjacent O and P atoms form a ring containing 2 to 6 carbon atoms;
- R3 is hydrogen or a methyl group, R4 is an alkylene group of 2 to 6 carbon atoms, R5 is hydrogen or a hydrocarbyl group of 1 to about 12 carbon atoms, and n is 1 or 2.
Dependencies are inferred from the claim text.