Lubricants and fuels containing boroxarophenanthrene compounds
First Claim
1. A compound of the formula ##STR6## wherein R'"'"' is a hydrocarbyl group containing 1 to 30 carbon atoms, n may be 0 or an integer of 1 to 4, and Ar is an aromatic moiety derived from a hindered phenol.
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Abstract
The present invention relates to 9-hydroxy-9,10-boroxarophenanthrene compositions which are particularly suitable additives to improve the stability of lubricating oils and fuel compositions. More particularly, esters of 9-hydroxy-9,10-boroxarophenanthrene which are formed from hindered phenols have been found to have improved and sustained oil solubility and comprise hydrolytically stable antioxidants which, in minor amounts, have been found to impart to oils of lubricating viscosity a high level of protection against oxidative degradation.
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12 Claims
- 1. A compound of the formula ##STR6## wherein R'"'"' is a hydrocarbyl group containing 1 to 30 carbon atoms, n may be 0 or an integer of 1 to 4, and Ar is an aromatic moiety derived from a hindered phenol.
Specification