Oxidation and corrosion resistant diesel engine lubricant
AssigneeTexaco Inc.
InventorsRodney L. Sung, Benjamin H. Zoleski, Ronald L. O'Rourke
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Abstract
An oxidation and corrosion resistant diesel engine lubricant composition, particularly useful in marine and railway diesel engines, comprises a major amount of a base hydrocarbon lubricating oil and from 0.1-5.0 weight percent of a reaction product additive which is the reaction product obtained by first reacting a hydroxybenzoic acid and a polyoxyalkylene polyol to form an ester, and thereafter reacting the ester with an aldehyde or ketone and a substituted or unsubstituted heterocyclic azole to produce the final reaction product.
Claims24
A diesel engine lubricating oil composition comprising a major amount of a hydrocarbon lubricating oil and from 0.1-5.0 weight percent of the reaction product prepared by:
- (a) first forming an ester by reacting at a temperature range of 50.degree. C.-150.degree. C. substantially equimolar amounts of a hydroxybenzoic acid and a polyoxyalkylene polyol of the formula ##STR5## where a+c has a value in the range of 1-20 and b has a value in the range of 5-50;
- and
- (b) thereafter further reacting at an elevated temperature said ester with equimolar amounts of an aldehyde or ketone and a substituted or unsubstituted heterocyclic azole.
A diesel engine lubricating oil composition comprising a major amount of a hydrocarbon lubricating oil and from 0.1-5.0 weight percent of the reaction product prepared by:
- (a) first forming an ester by reacting at a temperature range of 50.degree. C.-150.degree. C. substantially equimolar amounts of salicyclic acid and a polyoxyalkylene polyol of the formula ##STR7## where a+c has a value of about 2.2 and b has a value of about 14.7;
- and (b) thereafter further reacting at an elevated temperature said ester with equimolar amounts of 5-aminotriazole and paraformaldehyde.
A lubricating oil composition as in any one of the preceding claims, in which said composition comprises a major amount of a hydrocarbon lubricating oil and from 0.5-2.0 weight percent of said reaction product.
A method of preparing a diesel engine lubricating oil composition which comprises adding to a major portion of a hydrocarbon lubricating oil 0.1-5.0 weight percent of a reaction product prepared by:
- (a) first forming an ester by reacting at a temperature range of 50.degree. C.-150.degree. C. substantially equimolar amounts of a hydroxybenzoic acid and a polyoxyalkylene polyol of the formula ##STR8## where a+c has a value in the range of 1-20 and b has a value in the range of 5-50;
- and
- (b) thereafter further reacting at an elevated temperature said ester with equimolar amounts of an aldehyde or ketone and a substituted or unsubstituted heterocyclic azole.
A method of preparing a diesel engine lubricating oil composition which comprises adding to a major portion of a hydrocarbon lubricating oil 0.1-5.0 weight percent of a reaction product prepared by:
- (a) first forming an ester by reacting at a temperature range of 50.degree. C.-150.degree. C. substantially equimolar amounts of salicyclic acid and a polyoxyalkylene polyamine of the formula ##STR9## where a+c has a value of about 2.2, and b has a value of about 14.7;
- and (b) thereafter further reacting at an elevated temperature said ester with equimolar amounts of 5-aminotriazole and paraformaldehyde.
Dependencies are inferred from the claim text.