Grease composition

Abstract

The invention provides a grease composition which contains a base oil and a thickener, where the thickener is a diurea compound represented by formula (1), and the thickener is contained in an amount of 3 to 20 mass % in the grease composition: wherein R 2 is diphenylmethane group; and R 1 and R 3 , which may be the same or different represent cyclohexyl group or a straight-chain or branched alkyl group having 8 to 22 carbon atoms, with the ratio of the number of moles of the cyclohexyl group to the total number of moles of the cyclohexyl group and the alkyl group, expressed as [((the number of the cyclohexyl group)/(the number of the cyclohexyl group+the number of the alkyl group))×100] being 70 to 80 mol %.

1 . A grease composition comprising a base oil and a thickener, where the thickener is a diurea compound represented by formula (I), and the thickener is contained in an amount of 3 to 20 mass % in the grease composition: 
       
         
           
           
               
               
           
         
         wherein R 2  is diphenylmethane group; and R 1  and R 3 , which may be the same or different represent cyclohexyl group or a straight-chain or branched alkyl group having 8 to 22 carbon atoms, with the ratio of the number of moles of the cyclohexyl group to the total number of moles of the cyclohexyl group and the alkyl group, expressed as [((the number of the cyclohexyl group)/(the number of the cyclohexyl group+the number of the alkyl group))×100] being 70 to 80 mol %. 
       
     
     
         2 . The grease composition of  claim 1 , wherein the thickener is the diurea compound of formula (I) where the alkyl group is a straight-chain alkyl group having 16 to 20 carbon atoms. 
     
     
         3 . The grease composition of  claim 1 , used for a rolling bearing, gear wheel, ball thread, linear motion bearing, cam, or joint. 
     
     
         4 . A mechanical part where the grease composition of  claim 1  is enclosed.