Dispersants having antioxidant activity and lubricating compositions containing them
Lubricating oil additives having both dispersant and antioxidant activity, particularly useful for incorporation in two-stroke petrol engine lubricating oil compositions, are produced when a dispersant having free >n-h groups, E.G., a substituted succinimide, is reacted with an aldehyde and a compound having antioxidant activity containing in its molecular structure a group or groups capable of condensing with the aldehyde and >n-h groups present in the dispersant, thereby chemically bonding the compound to the dispersant. Representative antioxidants are mononuclear and polynuclear substituted phenols having at least one unsubstituted ortho- or para-position, E.G. 2,6-di-tert-butyl phenol and secondary aromatic amines. Typical reaction conditions are a temperature in the range 100* to 175/sup 0/C, and atmospheric pressure.
- Assignee:
- Chevron Research Co
- Patent Number(s):
- US 4248725
- OSTI ID:
- 6413948
- Resource Relation:
- Patent Priority Date: Priority date 23 Mar 1978, United Kingdom of Great Britain and Northern Ireland (UK)
- Country of Publication:
- United States
- Language:
- English
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