Antiwear and antioxidant additives
AssigneeMobil Oil Corporation
InventorsShi-Ming Wu, Andrew G. Horodysky
Life of this patent
Estimating the term…
Abstract
A reaction product useful as an antiwear or antioxidant additive in lubricants is made by reacting a sulfur-containing carboxylic acid, i.e. 3,3'-thiodipropionic acid and a phosphorodithioate, i.e. butoxylated bis(2-ethylhexyl) phosphorodithioic acid.
Claims19
A lubricant composition comprising a major proportion of a lubricant selected from the group consisting of a mineral oil or synthetic oil or blend thereof and a minor multifunctional antiwear and antioxidant amount of a reaction product of an alkoxylated diorgano phosphorodithioate of the formula:
- ##STR5## where R.sub.1 and R.sub.2 are the same or different straight or branched chain hydrocarbyl radicals containing 1 to 30 carbon atoms or aromatic hydrocarbyls, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 are each independently a hydrogen atom or a hydrocarbyl radical containing 1 to 60 carbon atoms, at least one of R.sub.3, R.sub.4, R.sub.5 and R.sub.6 is a hydrogen atom and a sulfur-containing carboxylic acid having the structural formula:
- ##STR6## where:
- n=0-2, a=0-1,
- b=0-1,
- c=0-1, and
- d=0-1, X is H, SH or CH.sub.2 CO.sub.2 H;
- provided that when n=0,
- c+d=1 and X is SH and if n is not 0, then X is not SH,
- and where R' is hydrogen or a hydrocarbyl radical which contains from about 1 to 60 carbon atoms and R.sub.7 and R.sub.8 are the same or different hydrocarbyl radicals containing from about 1 to 30 carbon atoms or R7 is a hydrogen atom.
A lubricant composition comprising a major amount of a lubricant selected from the group consisting of a mineral oil or synthetic oil or blend thereof and a minor multifunctional antiwear and antioxidant amount of a composition having any one of the following structures:
- ##STR7## where R.sub.1 and R.sub.2 are the same or different hydrocarbyl radicals containing 1 to 30 carbon atoms, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 are each independently a hydrogen atom or a hydrocarbyl radical containing 1 to 60 carbon atoms, at least one of which is a hydrogen atom, n ranges from 0 to 2, a, b, c and d range from 0 to 1, X is H, SH or CH.sub.2 CO.sub.2 H;
- provided that when n=0, c+d=1 and X is SH and if n is not 0, then X is not SH, and where R' is hydrogen or a hydrocarbyl radical which contains from about 1 to 60 carbon atoms and R.sub.7 and R.sub.8 are the same or different hydrocarbyl radicals containing from about 1 to 30 carbon atoms or R.sub.7 is a hydrogen atom.
A reaction product made by reacting of an alkoxylated diorgano phosphorodithioate of the formula:
- ##STR8## where R.sub.1 and R.sub.2 are the same or different straight or branched chain hydrocarbyl radicals containing 1 to 30 carbon atoms or aromatic hydrocarbyls, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 are each independently a hydrogen atom or a hydrocarbyl radical containing 1 to 60 carbon atoms, at least one of R.sub.3, R.sub.4, R.sub.5 and R.sub.6 is a hydrogen atom and a sulfur-containing carboxylic acid having the structural formula:
- ##STR9## where:
- n=0-2, a=0-1,
- b=0-1,
- c=0-1, and
- d=0-1, X is H, SH or CH.sub.2 CO.sub.2 H;
- provided that when n=0,
- c+d=1 and X is SH and if n is not 0, then X is not SH,
- and where R' is hydrogen or a hydrocarbyl radical which contains from about 1 to 60 carbon atoms and R.sub.7 and R.sub.8 are the same or different hydrocarbyl radicals containing from about 1 to 30 carbon atoms or R.sub.7 is a hydrogen atom.
Dependencies are inferred from the claim text.