Chloro-sulphur additive
AssigneeExxon Research & Engineering Co.
InventorAlain L. P. Lenack
Life of this patent
Estimating the term…
Abstract
Compounds suitable as extreme pressure additives for lubricating oils are of the general formula CX.sub.3 -S-S-R where X is a halogen and R is a hydrocarbyl. The performance of the compounds is improved by the addition of a stabilizer.
Claims17
An extreme pressure lubricating composition comprising a major proportion of lubricating oil, about 0.1 to 10 wt. % of an extreme pressure compound of the formula:
- Cl.sub.3 C--S--S--R
- wherein R is an alkyl radical containing 4 to 30 carbon atoms, said extreme pressure compound tending to liberate HCl;
- and about 0.5 to 5% by weight, based on the weight of said extreme pressure compound, of an oil soluble basic stabilizer which acts as an acid trap by reacting with said HCl and inhibits liberation of chlorine and sulphur from said extreme pressure compound at temperatures below 200.degree. C.
An extreme pressure cutting oil composition comprising a major amount of mineral lubricating oil, and 0.1 to 10 wt. % of an extreme pressure improving amount of compound of the formula:
- Cl.sub.3 C--S--S--R
- wherein R is an alkyl radical containing 8 to 30 carbon atoms, said compound tending to liberate HCl;
- and about 0.5 to about 5% by weight, based on the weight of said extreme pressure compound, of an oil soluble basic stabilizer which acts as an acid trap by reacting with said HCl and inhibits liberation of halogen and sulphur from said extreme pressure compound at temperatures below 200.degree. C., said stabilizer being selected from the group consisting of basic alkaline earth metal alkylbenzene sulphonates, basic alkaline earth metal alkyl phenates, epoxy resins, dicarboxylic acid esters, salts of fatty acids and heterocyclic nitrogen containing compounds, and mixtures thereof.
A concentrate for forming an extreme pressure lubricant consisting essentially of lubricating oil, about 10 to 60 wt. % of oil soluble compound of the formula:
- Cl.sub.3 C--S--S--R
- wherein R is an alkyl radical containing 8 to 30 carbon atoms, said compound tending to liberate HCl;
- and about 0.5 to 5% by weight, based on the weight of said extreme pressure compound, of an oil soluble basic stabilizer which acts as an acid trap by reacting with said HCl and inhibits liberation of halogen and sulphur from said extreme pressure compound at temperatures below 200.degree. C., said stabilizer being selected from the group consisting of basic alkaline earth metal alkylbenzene sulphonates, basic alkaline earth metal phenates, epoxy resins, dicarboxylic acid esters, salts of fatty acid and heterocyclic nitrogen containing compounds, and mixtures thereof.
Dependencies are inferred from the claim text.