Aqueous coating agent for forming lubricating films

Abstract

An aqueous coating agent comprising a hydrophilic resin; a solid lubricating agent comprising MoS 2 , antimony oxide, and at least one antimony sulfide selected from the group consisting of Sb 2 S 3 and Sb 2 S 5 ; and water; wherein the weight ratio of MoS 2 to antimony sulfide is from 1:0.05 to 1:1.2 and the weight ratio of the solid lubricating agent to the hydrophilic resin is from 0.7:1 to 3:1.

That which is claimed is:  
     
         1 . An aqueous coating agent comprising: 
 a hydrophilic resin;    a solid lubricating agent comprising MoS 2 , antimony oxide, and at least one antimony sulfide selected from the group consisting of Sb 2 S 3  and Sb 2 S 5 ; and    water;    wherein the weight ratio of MoS 2  to antimony sulfide is from 1:0.05 to 1:1.2 and the weight ratio of the solid lubricating agent to the hydrophilic resin is from 0.7:1 to 3:1.    
     
     
         2 . The aqueous coating agent according to  claim 1 , wherein the weight ratio of antimony oxide to antimony sulfide is from 1:0.5 to 1:5.0.  
     
     
         3 . The aqueous coating agent of  claim 2 , wherein the weight ratio of antimony sulfide is from 1:0.5 to 1:1.5.  
     
     
         4 . The aqueous coating agent of  claim 1 , wherein said hydrophilic resin is an epoxy ester obtained by esterifying an epoxy resin with an aliphatic resin.  
     
     
         5 . The aqueous coating agent of  claim 1 , further comprising a compatibility agent that improves compatibility between water and the hydrophilic resin.  
     
     
         6 . The aqueous coating agent of  claim 5 , wherein the compatibility agent is selected from the group consisting of water soluble amines, NaOH and ethanolamine.  
     
     
         7 . The aqueous coating agent of  claim 6 , wherein the compatibility agent is ethanolamine.