Ultra low phosphorus lubricant composition

Abstract

A low-phosphorus lubricating 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 400-800 ppm Mo;   (2) a hindered phenol component consisting of a non-methylene-bridged sterically hindered phenol at about 0.25-1.5%; and   (3) a zinc dithiocarbamate at about 0.15-0.5%; and   (4) alkylated diphenylamine at about 0.5-1.5%.   
     
     
         2 . The composition of  claim 1 , wherein the hindered phenol component is chosen from the group consisting of 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; and (iso-octyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate). 
     
     
         3 . The composition of  claim 2 , wherein the hindered phenol is (iso-octyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate). 
     
     
         4 . 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 400-800 ppm Mo;   (2) a hindered phenol component consisting of a non-methylene-bridged sterically hindered phenol at about 0.25-1.5%;   (3) a dithiocarbamate component comprising an (a) ashless dithiocarbamate and (b) said molybdenum dithiocarbamate, at a total dithiocarbamate component of about 0.6-1.2%; and   (4) an alkylated diphenyl amine, at about 0.5-1.5%.   
     
     
         5 . The composition of  claim 4 , wherein the ashless dithiocarbamate is methylene-bis-dialkyldithiocarbamate. 
     
     
         6 . The composition of  claim 4 , wherein the hindered phenol is chosen from the group consisting of 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; and (iso-octyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate). 
     
     
         7 . The composition of  claim 6 , wherein the hindered phenol is (iso-octyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate). 
     
     
         8 . 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 400-700 ppm Mo;   (2) a hindered phenol component consisting of a non-methylene-bridged sterically hindered phenol at about 1.5-1.75%; and   (3) a zinc dithiocarbamate at about 0.25-0.5%.   
     
     
         9 . The composition of  claim 8 , wherein the hindered phenol component is chosen from the group consisting of 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; and (iso-octyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate. 
     
     
         10 . The composition of  claim 9 , wherein the hindered phenol component comprises (iso-octyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate). 
     
     
         11 . 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 400-700 ppm Mo;   (2) a hindered phenol component consisting of a non-methylene-bridged sterically hindered phenol at about 0.75-0.80%;   (3) an ashless dithiocarbamate at about 0.4-1%; and   (4) an alkylated diphenyl amine at about 0.25-1.25%.   
     
     
         12 . The composition of  claim 11 , wherein the ashless dithiocarbamate is methylene-bis-dialkyldithiocarbamate. 
     
     
         13 . The composition of  claim 11 , wherein the hindered phenol is chosen from the group consisting of 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; and (iso-octyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate). 
     
     
         14 . The composition of  claim 13 , wherein the hindered phenol is (iso-octyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate).