Emulsion Composition

Abstract

The present invention provides an emulsion composition containing (a) a first phase with (i) an oil soluble inert medium; and (ii) an emulsifier capable of forming a water-in-oil emulsion; and (b) a second phase with (i) a metal base; (ii) an aqueous medium; and (iii) optionally a compound containing two or more hydroxyl groups, wherein a base in the form of an alkali metal or an alkaline earth metal oxide, hydroxide, carbonate, bicarbonate; or combinations thereof; and wherein the emulsion composition has a flow rate through a 45 μm filter of more than 8 ml/min in a filterability test carried out at ambient temperature and 45 kPa applied vacuum; wherein the filter has diameter of 5 cm and a mesh size of about 45 μm; and wherein the oil soluble inert medium in the filtration test is an oil of lubricating viscosity of a SAE 50 base oil. The invention further provides a method of preparing the emulsion composition and its use in a marine engine.

1 . An emulsion composition comprising:
 (a) a first phase comprising:
 (i) an oil soluble inert medium; and 
 (ii) an emulsifier capable of forming a water-in-oil emulsion; and 
   (b) a second phase comprises:
 (i) a metal base; 
 (ii) an aqueous medium; and 
 (iii) optionally a compound containing two or more hydroxyl groups, 
   
       wherein a base in the form of an alkali metal or an alkaline earth metal oxide, hydroxide, carbonate, bicarbonate; or combinations thereof; and wherein the emulsion composition has a flow rate through a 45 μm filter of more than 8 ml/min in a filterability test carried out at ambient temperature and 45 kPa applied vacuum; wherein the filter has diameter of 5 cm and a mesh size of about 45 μm; and wherein the oil soluble inert medium in the filtration test is an oil of lubricating viscosity of a SAE 50 base oil. 
     
     
         2 . The emulsion composition of  claim 1 , wherein the oil soluble inert medium is an oil of lubricating viscosity. 
     
     
         3 . The emulsion composition of  claim 3 , wherein the oil of lubricating viscosity has a SAE grade of 30-50. 
     
     
         4 . The emulsion composition of  claim 1 , wherein the emulsifier is a hydrocarbon lubricant-soluble hydrocarbyl substituted carboxylic acid acylating agent. 
     
     
         5 . The emulsion composition of  claim 4 , wherein the emulsifier is a hydrocarbyl-substituted succinic acid or anhydride. 
     
     
         6 . The emulsion composition of  claim 1 , wherein the emulsifier has a HLB of 1 to 8. 
     
     
         7 . The emulsion composition of  claim 1 , wherein the metal base has a total surface area of 2 m 2 g −1  to 10 m 2 g −1 . 
     
     
         8 . The emulsion composition of  claim 1 , wherein the metal of the metal base is calcium. 
     
     
         9 . The emulsion composition of  claim 1 , wherein the metal base is a calcium oxide or hydroxide. 
     
     
         10 . The emulsion composition of  claim 1  further comprising the compound containing two or more hydroxyl groups. 
     
     
         11 . The emulsion composition of  claim 10 , wherein the compound containing two or more hydroxyl groups has 2 to 8 hydroxyl groups. 
     
     
         12 . The emulsion composition of  claim 11 , wherein the compound containing two or more hydroxyl groups is ethylene glycol, diethylene glycol, triethylene glycol, glycerol, sorbitol, pentaerythritol, dipentaerythritol or mixtures thereof. 
     
     
         13 . The emulsion composition of  claim 1  further comprising a detergent, a dispersant or mixtures thereof. 
     
     
         14 . An emulsion composition comprising:
 (a) a first phase comprising:
 (i) 50 wt % to 97 wt % of an oil soluble inert medium; and 
 (ii) 0.05 wt % to 10 wt % of an emulsifier capable of forming a water-in-oil emulsion; and 
   (b) a second phase comprises:
 (i) a metal base; 
 (ii) an aqueous medium; 
 (iii) 0.05 wt % to 5 wt % of a compound containing two or more hydroxyl groups; and 
 (iv) 0.5 wt % to 10 wt % of at least one other performance additive, 
   
       wherein a base in the form of an alkali metal or an alkaline earth metal oxide, hydroxide, carbonate, bicarbonate; or combinations thereof; and wherein the emulsion composition has a flow rate through a 45 μm filter of more than 8 ml/min in a filterability test carried out at ambient temperature and 45 kPa applied vacuum; wherein the filter has diameter of 5 cm and a mesh size of about 45 μm; and wherein the oil soluble inert medium in the filtration test is an oil of lubricating viscosity of a SAE 50 base oil. 
     
     
         15 . A method for lubricating an internal combustion engine, comprising supplying thereto a lubricant comprising the emulsion composition of  claim 1 . 
     
     
         16 . The method of  claim 15 , wherein the internal combustion engine is a 2-stroke or a 4-stroke marine diesel engine.