Friction Modifiers for Slideway Applications

Abstract

A slideway lubricating oil composition, additive concentrate, method of lubricating sliding parts. The lubricating oil includes a base oil; a metal-free friction modifier; and a metal-free, sulfur-free, phosphorus containing anti-wear/extreme pressure agent. The lubricating oil provides a lower coefficient of friction for non-metal sliding surfaces than for metal sliding surfaces.

What is claimed is: 
     
         1 . A slideway lubricating oil composition comprising:
 a base oil;   a metal-free friction modifier; and   a metal-free, sulfur-free, phosphorus containing anti-wear/extreme pressure agent;   
       wherein the composition provides a lower coefficient of friction for non-metal sliding surfaces than for metal sliding surfaces. 
     
     
         2 . The lubricating oil composition of  claim 1 , wherein the metal-free friction modifier comprises an amine-containing, metal-free friction modifying compound. 
     
     
         3 . The lubricating oil composition of  claim 1 , wherein the anti-wear/extreme pressure agent comprises dimethyl octadecyl phosphonate. 
     
     
         4 . The lubricating oil composition of  claim 1 , further comprising a detergent, wherein the detergent is selected from the group consisting of a calcium overbased sulfonate, a calcium overbased phenate, and a calcium overbased salicylate. 
     
     
         5 . The lubricating oil composition of  claim 1 , further comprising a dispersant, wherein the dispersant is selected from the group consisting of a succinimide dispersant, a Mannich dispersant, and a functionalized olefin copolymer dispersant. 
     
     
         6 . A slideway lubricating additive composition comprising:
 a metal-free friction modifier; and   a metal-free, sulfur-free, phosphorus containing anti-wear/extreme pressure agent;   
       wherein a lubricant composition containing the additive exhibits a lower coefficient of friction for non-metal sliding surfaces than for metal sliding surfaces. 
     
     
         7 . The additive composition of  claim 6 , wherein the metal-free friction modifier comprises an amine-containing, metal-free friction modifying compound. 
     
     
         8 . The additive composition of  claim 6 , wherein the anti-wear/extreme pressure agent comprises dimethyl octadecyl phosphonate. 
     
     
         9 . The additive composition of  claim 6 , further comprising a detergent, wherein the detergent is selected from the group consisting of a calcium overbased sulfonate, a calcium overbased phenate, and a calcium overbased salicylate. 
     
     
         10 . The additive composition of  claim 6 , further comprising a dispersant, wherein the dispersant is selected from the group consisting of a succinimide dispersant, a Mannich dispersant, and a functionalized olefin copolymer dispersant. 
     
     
         11 . A slideway lubricant composition comprising a lubricant base stock and about 0.01% to about 1.0% by weight of the additive composition of  claim 6 . 
     
     
         12 . The lubricant composition of  claim 11 , wherein the lubricant composition is free of or essentially free of metal-containing friction modifiers. 
     
     
         13 . The lubricant composition of  claim 11 , wherein the lubricant composition is free of or essentially free of amine-free and metal-free friction modifiers. 
     
     
         14 . The lubricant composition of  claim 11 , wherein lubricant composition is free of or essentially free of metal-containing phosphorus/sulfur compounds and metal-free sulfur compounds. 
     
     
         15 . The lubricant composition of  claim 11 , wherein lubricant composition comprises at least one friction modifying additives selected form the group consisting of metal-free friction modifiers, amine-containing metal-free friction modifiers, and metal- and sulfur-free phosphorus compound friction modifiers. 
     
     
         16 . The lubricant composition of  claim 11 , wherein a boundary friction coefficient measured on non-metal is from 25 to 50 percent less than a boundary friction coefficient for the same lubricant composition as measures on metal surfaces. 
     
     
         17 . A method of lubricating a non-metal surface of a slideway component, the method comprising applying a lubricant composition to the slideway component, the lubricant composition comprising:
 a base oil;   a metal-free friction modifier;   a metal-free, sulfur-free, phosphorus containing anti-wear/extreme pressure agent;   
       wherein the composition provides a lower coefficient of friction for non-metal sliding surfaces than for metal sliding surfaces. 
     
     
         18 . The method of  claim 17 , wherein the metal-free friction modifier comprises an amine-containing, metal-free friction modifying compound. 
     
     
         19 . The method of  claim 17 , wherein the anti-wear/extreme pressure agent comprises dimethyl octadecyl phosphonate. 
     
     
         20 . The method of  claim 17 , wherein the lubricant composition includes a detergent selected from the group consisting of a calcium overbased sulfonate, a calcium overbased phenate, and a calcium overbased salicylate.