Bis-1,3,4-thiadiazole compounds and lubricating compositions containing same
AssigneeR. T. Vanderbilt Company, Inc.
InventorsThomas J. Karol, Ronald J. Tepper
Life of this patent
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Abstract
Disclosed are novel compounds prepared by reacting two moles of 2,5-dimercapto-1,3,4-thiadiazole and one mole of a hydrocarbon compound selected from terpenes, aryl compounds and aliphatic compounds which may be substituted by oxygen or oxygen containing groups. The hydrocarbon compound forms a bivalent radical linking together the two 2,5-dimercapto-1,3,4-thiadiazoles. The compounds are effective extreme pressure agents when incorporated into lubricating compositions.
Claims18
A bis-1,3,4-thiadiazole compound having the structural formula ##STR9## wherein R represents a divalent radical derived from mixed terpenes.
A bis-1,3,4-thiadiazole compound having the structural formula ##STR10## wherein R represents a divalent radical derived from oxygenated terpenes.
A bis-1,3,4-thiadiazole compound having the structural formula ##STR11## wherein R represents a divalent radical derived from limonene.
A bis-1,3,4-thiadiazole compound having the structural formula ##STR12## wherein R represents a divalent radical derived from glyoxal.
A lubricating composition comprising a major portion of an oil of lubricating viscosity and a minor extreme pressure imparting amount of a bis-1,3,4-thiadiazole compound selected from the group consisting of compounds having the structural formula ##STR13## wherein R represents a divalent arylene radical having oxygen or oxygen containing substituent groups, alkyl and alkylene groups having up to 6 carbon atoms;
- alkylene radical having oxygen or oxygen containing substituent groups;
- and a divalent radical derived from terpenes, oxygenated terpenes or mixtures thereof.
A lubricating composition comprising a major portion of an oil of lubricating viscosity and a minor extreme pressure imparting amount of a bis-1,3,4-thiadiazole compound selected from the group consisting of compounds having the structural formula ##STR14## wherein m=1 to 3 and R.sup.3 is represented by the structural group ##STR15## and n=0 to 14, R.sup.1 is hydrogen or methyl and R.sup.2 is hydrogen or branched or straight chain alkyl having 1 to 20 carbon atoms.
A method for protecting metal surfaces from wear which comprises contacting the surfaces with a lubricating composition comprising a major amount of base oil of lubricating viscosity, the improvement of which consists of adding to the oil a minor extreme pressure imparting amount of an additive selected from the group of compounds having the structural formula ##STR16## wherein R represents a divalent arylene radical having oxygen or oxygen containing substituent groups, alkyl and alkylene groups having up to 6 carbon atoms;
- alkylene radical having oxygen or oxygen containing substituent groups, and a divalent radical derived from terpenes, oxygenated terpenes or mixtures thereof.
Dependencies are inferred from the claim text.