Removable protective coating

Abstract

A protective coating which is removable with a removing agent comprising a strong base, which protective coating comprises a pigment, a weak base and a binder, the binder being a polymer having a weight-average molecular weight of 10,000-100,000 and an acid value of 40-250. A protective agent and a method for forming the protective coating.

We claim:  
     
         1 . A method for removing a protective coating comprising treating the protective coating with a removing agent which comprises a strong base and a complex former, wherein the protective coating comprises a pigment and a binder, the binder being a polymer having a weight-average molecular weight of 10,000-100,000 and an acid value of 40-250.  
     
     
         2 . The method according to  claim 1 , wherein the strong base is present in an amount of 1-10% by weight, based on the weight of the removing agent.  
     
     
         3 . A method of according to  claim 1 , wherein the complex former is present in an amount of 2-10% by weight, based on the weight of the removing agent.  
     
     
         4 . A method according to  claim 1 , wherein the removing agent further comprises an organic solvent.  
     
     
         5 . A method according to  claim 4 , wherein the organic solvent is selected from the group of tetrahydrofuran, benzyl alcohol, and higher alcohols.  
     
     
         6 . A method according to  claim 5 , wherein the removing agent comprises 10-30% by weight, based on the weight of the removing agent, of benzyl alcohol.