Lubricant blends with pao-based dispersants

Abstract

Provided is a lubricant blend including one or more lubricant base stocks and one or more dispersants. The dispersant is chosen from a polyalphaolefin succinimide, a polyalphaolefin succinamide, a polyalphaolefin acid ester, a polyalphaolefin oxazoline, a polyalphaolefin imidazoline, a polyalphaolefin succinamide imidazoline, and combinations thereof. The one or more dispersants are present at 2 to 20 wt % based on the total weight of the blend. The one or more dispersants and the one or more lubricant base stocks are together present at 8 wt % or more of the total weight of the blend. Provided is also a process for making the lubricant blend and a method for the service life of a lubricant.

1 . A lubricant blend comprising one or more lubricant base stocks and a dispersant chosen from:
 a polyalphaolefin succinimide,   a polyalphaolefin succinamide,   a polyalphaolefin acid ester,   a polyalphaolefin oxazoline,   a polyalphaolefin imidazoline,   a polyalphaolefin succinamide imidazoline, and   combinations thereof,   wherein the one or more dispersants are present at 2 to 20 wt % based on the total weight of the blend, and wherein the one or more dispersants and the one or more lubricant base stocks are together present at 85 wt % or more of the total weight of the blend.   
     
     
         2 . The blend of  claim 1 , wherein the one or more dispersants and the one or more lubricant base stocks are together present at 90 wt % or more of the total weight of the blend. 
     
     
         3 . The blend of  claim 1 , wherein the one or more dispersants and the one or more lubricant base stocks are together present at 95 wt % or more of the total weight of the blend. 
     
     
         4 . The blend of  claim 1 , wherein the one or more dispersants are present at 5 to 15 wt % based on the total weight of the blend. 
     
     
         5 . The blend of  claim 1 , wherein the one or more dispersants are present at 5 to 10 wt % based on the total weight of the blend. 
     
     
         6 . The blend of  claim 1 , wherein the one or more lubricant base stocks is chosen from a Group I, Group II, Group II+, Group III, Group III+, Group IV, Group V, and combinations thereof. 
     
     
         7 . The blend of  claim 1 , wherein the one or more lubricant base stocks includes a Group III+ base stock. 
     
     
         8 . The blend of  claim 1 , wherein the dispersant exhibits a kinematic viscosity at 100° C. of less than 700 cS, a kinematic viscosity at 40° C. of less than 50,000 cS, and a viscosity index of greater than 135. 
     
     
         9 . The blend of  claim 1 , wherein the dispersant diluted with up to 35 wt % mineral oil exhibits a kinematic viscosity at 100° C. of less than 200 cS, a kinematic viscosity at 40° C. of less than 10,000 cS, and a viscosity index of greater than 100, from 100 to 200. 
     
     
         10 . The blend of  claim 1 , wherein the dispersant is a polyalphaolefin succinimide. 
     
     
         11 . The blend of  claim 1 , wherein the dispersant is a polyalphaolefin succinamide. 
     
     
         12 . The blend of  claim 1 , wherein the dispersant is a polyalphaolefin acid ester. 
     
     
         13 . The blend of  claim 1 , wherein the dispersant is a polyalphaolefin oxazoline. 
     
     
         14 . The blend of  claim 1 , wherein the dispersant is a polyalphaolefin imidazoline. 
     
     
         15 . The blend of  claim 1 , wherein the dispersant is a polyalphaolefin succinamide. 
     
     
         16 . A process for making a lubricant blend comprising: admixing an amount of one or more lubricant base stocks and an amount of a dispersant chosen from:
 a polyalphaolefin succinimide,   a polyalphaolefin succinamide,   a polyalphaolefin acid ester,   a polyalphaolefin oxazoline,   a polyalphaolefin imidazoline,   a polyalphaolefin succinamide imidazoline, and   combinations thereof,   wherein the one or more dispersants are present at 2 to 20 wt % based on the total weight of the blend, and wherein the one or more dispersants and the one or more lubricant base stocks are together present at 85 wt % or more of the total weight of the blend.   
     
     
         17 . The process of  claim 16 , wherein the one or more lubricant base stocks is chosen from a Group I, Group II, Group II+, Group III, Group III+, Group IV, Group V, and combinations thereof. 
     
     
         18 . The process of  claim 16 , wherein the dispersant exhibits a kinematic viscosity at 100° C. of less than 700 cS, a kinematic viscosity at 40° C. of less than 50,000 cS, and a viscosity index of greater than 135. 
     
     
         19 . The process of  claim 16 , wherein the dispersant diluted with up to 35 wt % mineral oil exhibits a kinematic viscosity at 100° C. of less than 200 cS, a kinematic viscosity at 40° C. of less than 10,000 cS, and a viscosity index of greater than 100, from 100 to 200. 
     
     
         20 . A method for lengthening the service life of a lubricant formulation comprising: admixing with one or more lubricant base stocks an amount of a dispersant chosen from:
 a polyalphaolefin succinimide,   a polyalphaolefin succinamide,   a polyalphaolefin acid ester,   a polyalphaolefin oxazoline,   a polyalphaolefin imidazoline,   a polyalphaolefin succinamide imidazoline, and   combinations thereof, and   utilizing the lubricant formulation as an oil or grease in a device or apparatus requiring lubrication of moving and/or interacting mechanical parts, components, or surfaces,   wherein the one or more dispersants are present at 2 to 20 wt % based on the total weight of the blend, and wherein the one or more dispersants and the one or more lubricant base stocks are together present at 85 wt % or more of the total weight of the blend.   
     
     
         21 . The method of  claim 20 , wherein the one or more lubricant base stocks is chosen from a Group I, Group II, Group II+, Group III, Group III+, Group IV, Group V, and combinations thereof. 
     
     
         22 . The method of  claim 20 , wherein the dispersant exhibits a kinematic viscosity at 100° C. of less than 700 cS, a kinematic viscosity at 40° C. of less than 50,000 cS, and a viscosity index of greater than 135. 
     
     
         23 . The method of  claim 20 , wherein the dispersant diluted with up to 35 wt % mineral oil exhibits a kinematic viscosity at 100° C. of less than 200 cS, a kinematic viscosity at 40° C. of less than 10,000 cS, and a viscosity index of greater than 100, from 100 to 200. 
     
     
         24 . A lubricant formulation prepared by the process comprising: admixing with one or more lubricant base stocks an amount of a dispersant chosen from:
 a polyalphaolefin succinimide prepared by reacting an unhydrogenated polyalphaolefin with maleic anhydride to form a polyalphaolefin anhydride followed by reacting the polyalphaolefin anhydride with a polyamine,   a polyalphaolefin succinamide prepared by reacting an unhydrogenated polyalphaolefin with maleic anhydride to form a polyalphaolefin anhydride followed by reacting the polyalphaolefin anhydride with a polyamine,   a polyalphaolefin acid ester prepared by reacting an unhydrogenated polyalphaolefin with maleic anhydride to form a polyalphaolefin anhydride followed by reacting the polyalphaolefin anhydride with a polyamine,   a polyalphaolefin oxazoline prepared by reacting an unhydrogenated polyalphaolefin with maleic anhydride to form a polyalphaolefin anhydride followed by reacting the polyalphaolefin anhydride with an aminoalcohol,   a polyalphaolefin amide-imidazoline prepared by reacting a polyalphaolefin succinamide with a polyamine, and   combinations of two or more of the foregoing,   wherein the one or more dispersants are present at 2 to 20 wt % based on the total weight of the blend, and wherein the one or more dispersants and the one or more lubricant base stocks are together present at 85 wt % or more of the total weight of the blend.