Ultra low phosphorus lubricant composition

Abstract

A low-phosphorus lubrication composition has less than 600 ppm phosphorus, comprising at least 85 weight % of a lubricating base blend, and an additive comprising the following, as weight % of the total composition: (1) an organomolybdenum compound at an amount which provides about 0.1-800 ppm Mo; (2) a hindered phenol at about 0.1-2%; and (3) a dithiocarbamate at about 0.1-2%; with a first proviso that where the dithiocarbamate does not comprise a metal dithiocarbamate, the additive additionally comprises: (4) an alkylated diphenylamine at about 0.1-2%, and with a second proviso that where the organomolybdenum compound comprises molybdenum dithiocarbamate, it is considered a metal dithiocarbamate for purposes of the first proviso, but is considered an organomolybdenum compound for the purposes of calculation of the amount present in the total composition.

What is claimed is: 
     
         1 . A low-phosphorus lubricating composition having less than 600 ppm phosphorus, comprising at least 85 weight % of a lubricating base blend, and an additive comprising the following, as weight % of the total composition:
 (1) an organomolybdenum complex prepared by reacting about 1 mole of fatty oil, about 1.0 to 2.5 moles of diethanolamine and a molybdenum source sufficient to yield about 0.1 to 12.0 percent of molybdenum, at an amount of the complex which provides about 0.1-800 ppm Mo;   (2) a hindered phenol component consisting of a non-methylene-bridged sterically hindered phenol at about 0.1-2%; and   (3) a zinc dithiocarbamate at about 0.1-2%.   
     
     
         2 . The composition of  claim 1 , wherein the hindered phenol component comprises 2′6′-di tert butyl phenol, optionally para-substituted with —CH2—CH2—C(O)—OR1, where R1 is chosen from the group consisting of butyl, ethylhexyl, iso-octyl, isostearyl and stearyl. 
     
     
         3 . The composition of  claim 1 , wherein the hindered phenol component comprises (iso-octyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate). 
     
     
         4 . The composition of  claim 1 , wherein
 (1) the organomolybdenum complex is present at an amount which provides about 50-800 ppm Mo;   (2) the hindered phenol is present at about 0.5-1.5%; and   (3) the zinc dithiocarbamate is present at about 0.25-1.5%.   
     
     
         5 . The composition of  claim 4 , wherein
 (1) the organomolybdenum complex is present at an amount which provides about 400-700 ppm Mo;   (2) the hindered phenol is present at about 0.5-1.5%; and   (3) the zinc dithiocarbamate is present at about 0.4-1.0%.   
     
     
         6 . The composition of  claim 5 , wherein
 (1) the organomolybdenum complex is present at an amount which provides about 700 ppm Mo;   (2) the hindered phenol is present at about 0.75-1.5%; and   (3) the zinc dithiocarbamate is present at about 0.5%.   
     
     
         7 . A low-phosphorus lubricating composition having less than 600 ppm phosphorus, comprising at least 85 weight % of a lubricating base blend, and an additive comprising the following, as weight % of the total composition:
 (1) an organomolybdenum complex prepared by reacting about 1 mole of fatty oil, about 1.0 to 2.5 moles of diethanolamine and a molybdenum source sufficient to yield about 0.1 to 12.0 percent of molybdenum, being present at an amount which provides about 0.1-800 ppm Mo;   (2) a hindered phenol component consisting of a non-methylene-bridged sterically hindered phenol at about 0.1-2%;   (3) an ashless dithiocarbamate at about 0.1-2%; and   (4) an alkylated diphenyl amine at about 0.1-2.0%.   
     
     
         8 . The composition of  claim 7 , wherein the ashless dithiocarbamate is methylene-bis-dialkyldithiocarbamate. 
     
     
         9 . The composition of  claim 7 , wherein the hindered phenol is 2′6′-di tert butyl phenol, optionally para-substituted with —CH2—CH2—C(O)—OR1, where R1 is chosen from the group consisting of butyl, ethylhexyl, iso-octyl, isostearyl and stearyl. 
     
     
         10 . The composition of  claim 7 , wherein the hindered phenol is (iso-octyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate). 
     
     
         11 . The composition of  claim 7 , wherein
 (1) the organomolybdenum complex is present at an amount which provides about 50-800 ppm Mo;   (2) the hindered phenol is present at about 0.5-1.6%;   (3) the dithiocarbamate is present at about 0.25-1.5%; and   (4) the alklylated diphenyl amine is present at about 0.25-1.25%.   
     
     
         12 . The composition of  claim 11 , wherein
 (1) the organomolybdenum component is present at an amount which provides about 400-700 ppm Mo;   (2) the hindered phenol is present at about 0.75-1.6%;   (3) the dithiocarbamate is present at about 0.4-1.0%; and   (4) the alklylated diphenyl amine is present at about 0.25-1.25%.   
     
     
         13 . A low-phosphorus lubricating composition having less than 600 ppm phosphorus, comprising at least 85 weight % of a lubricating base blend, and an additive comprising the following, as weight % of the total composition:
 (1) an organomolybdenum component comprising:
 (a) an organomolybdenum complex prepared by reacting about 1 mole of fatty oil, about 1.0 to 2.5 moles of diethanolamine and a molybdenum source sufficient to yield about 0.1 to 12.0 percent of molybdenum, and 
 (b) a molybdenum dithiocarbamate, 
   the organomolybdenum component being present at an amount which provides about 0.1-800 ppm Mo;   (2) a hindered phenol component consisting of a non-methylene-bridged sterically hindered phenol at about 0.1-2%;   (3) a dithiocarbamate component comprising an (a) ashless dithiocarbamate and (b) said molybdenum dithiocarbamate, at a total dithiocarbamate component of about 0.1-2%; and   (4) an alkylated diphenyl amine, at about 0.1-2.0%.   
     
     
         14 . The composition of  claim 13 , wherein the ashless dithiocarbamate is methylene-bis-dialkyldithiocarbamate. 
     
     
         15 . The composition of  claim 13 , wherein the hindered phenol is 2′6′-di tert butyl phenol, optionally para-substituted with —CH2—CH2—C(O)—OR1, where R1 is chosen from the group consisting of butyl, ethylhexyl, iso-octyl, isostearyl and stearyl. 
     
     
         16 . The composition of  claim 13 , wherein the hindered phenol is (iso-octyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate). 
     
     
         17 . The composition of  claim 13 , wherein
 (1) the organomolybdenum component is present at an amount which provides about 50-800 ppm Mo;   (2) the hindered phenol is present at about 0.5-1.6%;   (3) the dithiocarbamate component is present at about 0.25-1.5%; and   (4) the alklylated diphenyl amine is present at about 0.25-1.25%.   
     
     
         18 . The composition of  claim 17 , wherein
 (1) the organomolybdenum component is present at an amount which provides about 400-700 ppm Mo;   (2) the hindered phenol is present at about 0.75-1.6%;   (3) the dithiocarbamate is present at about 0.4-1.0%; and   (4) the alklylated diphenyl amine is present at about 0.25-1.25%.