Use of a catalyst in a base coating to improve the strippability of subsequent coatings

Abstract

The invention is a method of stripping one or more additional coats covering a barrier primer coat that covers a surface. The barrier coat contains a catalyst, such as manganese dioxide and, or, manganese carbonate, for the decomposition of hydrogen peroxide. The top coat of the covered surface is contacted with the stripping agent at decomposition reaction conditions.

1 . A method of stripping one or more additional coats covering a barrier primer coat, said barrier primer coat containing a catalyst for the decomposition of hydrogen peroxide, said barrier primer coat and one or more additional coats covering a surface with said one or more additional coats comprising a top coat as the outermost layer having a surface exposed to the environment, said method comprising contacting the top coat of the covered surface with a stripping agent comprising hydrogen peroxide at decomposition reaction conditions. 
     
     
         2 . The method according to  claim 1 , wherein said catalyst comprises one or more oxides, hydroxides or salts of metals selected from the group consisting of Se, Fe, Cu, Cr, Zn, Mn, Ag, Ni, Co, Ti, V, Pb, Hg, Cd, Mo, W, Pt, Pd, and Os. 
     
     
         3 . The method according to  claim 3 , wherein said catalyst comprises manganese dioxide and, or, manganese carbonate. 
     
     
         4 . The method according to  claim 1 , wherein said catalyst comprises samarium. 
     
     
         5 . The method according to  claim 1 , wherein said catalyst is a solid embedded in said barrier primer coat. 
     
     
         6 . The method according to  claim 1 , wherein said barrier primer coat has polymer functionality with chelating capability and said catalyst is chelated with said primer coat. 
     
     
         7 . The method according to  claim 1 , wherein said surface is a metal surface. 
     
     
         8 . The method according to  claim 1 , wherein said barrier primer coat comprises from about 0.01 to about 35% by volume of said catalyst. 
     
     
         9 . The method according to  claim 1 , wherein said stripping agent comprises from about 1 to about 7 wt % hydrogen peroxide.