Additive concentrate

Abstract

The present invention provides an additive concentrate comprising: − at least 90 wt. % of a Fischer-Tropsch derived base oil, based on the total weight of the additive concentrate; − at least 3.0 wt. % of a viscosity modifier, based on the total weight of the additive concentrate; and − less than 5.0 wt. % of a solvency booster, based on the total weight of the additive concentrate.

1 . An additive concentrate comprising:
 at least 90 wt. % of a Fischer-Tropsch derived base oil, based on the total weight of the additive concentrate;   at least 3.0 wt. % of a viscosity modifier, based on the total weight of the additive concentrate; and   less than 5.0 wt. % of a solvency booster, based on the total weight of the additive concentrate.   
     
     
         2 . The additive concentrate according to  claim 1 , wherein the additive concentrate comprises less than 10.0 wt. % of a non-Fischer-Tropsch derived base oil based on the total weight of the additive concentrate. 
     
     
         3 . The additive concentrate according to  claim 1  wherein the Fischer-Tropsch derived base oil has a kinematic viscosity at 100° C. (according to ASTM D7042) of below 5.0 mm 2 /s. 
     
     
         4 . The additive concentrate according to  claim 1  wherein the Fischer-Tropsch derived base oil has a Viscosity Index (according to ASTM D 2270) of at least 125. 
     
     
         5 . The additive concentrate according to  claim 1  wherein the additive concentrate comprises from 5.0 to 10 wt. % of the viscosity modifier, based on the total weight of the additive concentrate. 
     
     
         6 . The additive concentrate according to  claim 1  wherein the additive concentrate comprises less than 2.0 wt. %, based on the total weight of the additive concentrate. 
     
     
         7 . The additive concentrate according to  claim 1  wherein the solvency booster has an aniline point (according to ASTM D 611) of less than 100° C. 
     
     
         8 . The additive concentrate according to  claim 1  wherein the solvency booster is an alkylated aromatic component. 
     
     
         9 . The additive concentrate according to  claim 8 , wherein the alkylated aromatic component is selected from alkylated benzenes, alkylated anthracenes, alkylated phenanthrenes, alkylated biphenyls, and alkylated naphthalenes, and mixtures thereof. 
     
     
         10 . The additive concentrate according to  claim 1  wherein the additive concentrate when normalized at a concentration of viscosity modifier of 1.0 wt. % has a dynamic viscosity at -30° C. (according to ASTM D 5293) of below 3000 cP and a kinematic viscosity at 100° C. (according to ASTM D 7042) of at least 5.5 cSt. 
     
     
         11 . The additive concentrate according to  claim 1  further comprising 5 to 500 ppm of an anti-oxidant. 
     
     
         12 . A lubricant composition comprising a base oil, one or more additives other than a viscosity modifier and the additive concentrate according to  claim 1 .