Epoxyamine alkoxylate motor oil dispersants

Abstract

A composition comprising a base oil and a dispersant, the base oil comprising a polyalkylene glycol and the dispersant being an epoxy amine alkoxylate of Structure I is useful in a process whereby the composition is used as a lubricant in a mechanical device.

1 . A composition comprising a base oil and a dispersant wherein the base oil comprises a polyalkylene glycol and the dispersant has the following structure: 
       
         
           
           
               
               
           
         
       
       where A is homopolymer of propylene oxide or a random copolymer of ethylene oxide and propylene oxide and where the concentration of ethylene oxide moieties in A is from zero to 30 weight percent based on total weight of ethylene oxide and propylene oxide moieties and wherein the dispersant has a molecular weight in a range of 5,000 grams per mole and 7,500 grams per mole where the base oil contains more than 50 weight-percent of the polyalkylene glycol based on total base oil weight. 
     
     
         2 . The composition of  claim 1 , further characterized by the concentration of dispersant being in a range of 3 to 12 weight-percent based on total weight of base oil and dispersant. 
     
     
         3 . The composition of  claim 1 , further characterized by the base oil consisting of one or a combination of more than one polyalkylene glycol. 
     
     
         4 . The composition of  claim 1 , further characterized by the dispersant having a molecular weight in a range of 6,000 grams per mole and 7,000 grams per mole. 
     
     
         5 . The composition of  claim 1 , further characterized by the base oil comprising an alcohol initiated water-insoluble propylene oxide polymer. 
     
     
         6 . A process comprising the steps of providing the composition of  claim 1  into a mechanical device where parts move with respect to one another such that the composition contacts at least a portion of the area between the parts that move with respect to one another. 
     
     
         7 . The process of  claim 6 , further characterized by the mechanical device being an engine and the parts that move with respect to one another being a piston and piston shaft of the engine. 
     
     
         8 . The process of  claim 7 , where the mechanical device is a diesel engine.