Coating removal composition

Abstract

The present invention is directed to a coating removal composition comprising at least one weak metal binding agent, a solvent system comprising at least one alcohol or ester, and a corrosion inhibition system. A method of removing a coating from an intentionally colored concrete floor is also disclosed. Utilization of the method results in at least 70% retention of colorant component after stripping a coating from an intentionally colored concrete surface, such as a floor.

1 . A coating removal composition comprising:
 a) at least one weak metal binding agent;   b) a solvent system comprising at least one alcohol or ester, and   c) a corrosion inhibition system.   
     
     
         2 . The coating removal composition of  claim 1  wherein the weak metal binding agent is an ethoxylated amine having the formula: 
       
         
           
           
               
               
           
         
       
       where R, R′ and R″ are independently C3-C26 alkyl, aryl or alkyl ether groups wherein y is an integer from 2 to 10, z is an integer from 1 to 20, such that y+z=6 to 26, x is an integer from 1 to 15 and n is an integer from 1 to 25. 
     
     
         3 . The coating removal composition of  claim 2  wherein the weak metal binding agent is a primary or secondary ethoxylated amine. 
     
     
         4 . The coating removal composition of  claim 2  wherein the weak metal binding agent is selected from the group consisting of bis-(2-hydroxyethyl) isodecyloxypropylamine, poly (5) oxyethylene isodecyloxypropylamine, bis-(2-hydroxyethyl isodecyloxypropylamine, poly (5)) oxyethylene isotridecyloxypropyl amine, bis-(2-hydroxyethyl) linear alkyloxypropylamine, bis (2-hydroxyethyl) soya amine, poly (15) oxyethylene soya amine, bis (2-hydroxyethyl) octadecylamine, poly (5) oxyethylene octadecylamine, poly (8) oxyethylene octadecylamine, poly (10) oxyethylene octadecylamine, poly (15) oxyethylene octadecylamine, bis (2-hydroxyethyl) octadecyloxypropylamine, bis-(2-hydroxyethyl) tallow amine, poly (5) oxyethylene tallow amine, poly (15) oxyethylene tallow amine, poly (3) oxyethylene 1,3 diaminopropane and bis (2-hydroxyethyl) coco amine and combinations thereof. 
     
     
         5 . The coating removal composition of  claim 1  wherein the weak metal binding agent comprises about 0.5 to 25.0 weight percent of the composition. 
     
     
         6 . The coating removal composition of  claim 5  wherein the weak metal binding agent comprises 3.0 to 15.0 weight percent of the composition. 
     
     
         7 . The coating removal composition of  claim 5  wherein the weak metal binding agent comprises 5.0 to 10.0 weight percent of the composition. 
     
     
         8 . The coating removal composition of  claim 8  wherein the at least one alcohol is a polyhydric alcohol. 
     
     
         9 . The coating removal composition of  claim 8  wherein the polyhydric alcohol includes an alkane polyol having from 2 to 6 carbon atoms and from 2 to 3 hydroxyl groups in the molecule. 
     
     
         10 . The coating removal composition of  claim 9  wherein the polyhydric alcohol is selected from the group consisting of ethylene glycol, propylene glycol, dipropylene glycol, glycerin, 1,2-Butanediol, 1,3-Butanediol, 1,4-Butanediol, 2,3-Butanediol, 1,2-Propanediol, 1,5-Pentanediol, meso-erythritol, neopentyl glycol, pentaerythritol, and blends thereof. 
     
     
         11 . The coating removal composition of  claim 11  wherein the at least one alcohol is an aromatic alcohol. 
     
     
         12 . The coating removal composition of  claim 11  wherein the aromatic alcohol is selected from the group consisting of benzyl alcohol, xylenol, phenol, etc. Exemplary solvents include but are not limited to glycol ether based solvents based on ethylene or propylene glycol such as ethylene glycol, propylene glycol, diethylene glycol ethyl ether, dipropylene glycol methyl ether, diethylene glycol methyl ether, diethylene glycol propyl ether, diethylene glycol butyl ether, ethylene/diethylene glycol 2-ethylhexyl ether, ethylene glycol phenyl ether, dipropylene glycol propyl ether, dipropylene glycol butyl ether, propylene glycol phenyl ether, and blends thereof. 
     
     
         13 . The coating removal composition of  claim 1  wherein the at least one alcohol is a monoalcohol. 
     
     
         14 . The coating removal composition of  claim 1  wherein the ester is selected from the group consisting of propylene glycol dibenzoate, dipropylene glycol dibenzoate, polypropylene glycol dibenzoate, ethylene glycol dibenzoate, diethylene glycol dibenzoate, polyethylene glycol dibenzoate, neopentyl glycol dibenzoate, and the like as well as isodecyl benzoate, dipropylene glycol monomethyl ether benzoate, 2,2,4-trimethyl-1,3-pentanediol diisobutyrate and blends thereof. 
     
     
         15 . The coating removal composition of  claim 1  wherein the solvent system comprises about 0.50 to 98.5 weight percent of the composition. 
     
     
         16 . The coating removal composition of  claim 15  wherein the solvent system comprises about 10.0 to 80.0 weight percent of the composition. 
     
     
         17 . The coating removal composition of  claim 15  wherein the solvent system comprises about 20.0 to 50.0 weight percent of the composition. 
     
     
         18 . The coating removal composition of  claim 1  wherein the corrosion inhibition system includes a heterocyclic organic material. 
     
     
         19 . The coating removal composition of  claim 18  wherein the heterocyclic organic material is selected from the group consisting of azoles, mercaptans, furans and combinations thereof. 
     
     
         20 . The coating removal composition of  claim 1  wherein the corrosion inhibition system comprises about 0.05 to 25.0 weight percent of the composition. 
     
     
         21 . The coating removal composition of  claim 1  further comprising an inorganic alkaline salt. 
     
     
         22 . The coating removal composition of  claim 21  wherein the inorganic alkaline salt is selected from the group consisting of lithium carbonate, potassium carbonate, sodium carbonate, lithium hydroxide, potassium hydroxide, sodium hydroxide, lithium silicates, sodium silicates, potassium silicates, lithium phosphates in all forms, sodium phosphates, potassium phosphates, and combinations thereof. 
     
     
         23 . The coating removal composition of  claim 21  wherein the inorganic alkaline salt comprises is about 0.05 to 25.0 weight percent of the composition. 
     
     
         24 . The coating removal composition of  claim 23  wherein the inorganic alkaline salt comprises is about 0.50 to 15.0 weight percent of the composition. 
     
     
         25 . The coating removal composition of  claim 23  wherein the inorganic alkaline salt comprises is about 1.0 to 10.0 weight percent of the composition. 
     
     
         26 . The coating removal composition of  claim 23  wherein the inorganic alkaline salt comprises is about 2.0 to 5.0 weight percent of the composition. 
     
     
         27 . The coating removal composition of  claim 1  wherein the ration of weak metal binding agent to corrosion inhibition system is 1:4. 
     
     
         28 . A method of removing a coating from an intentionally colored concrete floor comprising:
 a) applying a coating removal composition to an intentionally colored concrete floor, said colored concrete floor having a colorant component and coating;   b) allowing said coating removal composition to remain on the floor for a period of time; and   c) removing the composition and coating from the floor, wherein the intentionally colored concrete floor retains at least 70% of the colorant component.   
     
     
         29 . The method of  claim 28  wherein the intentionally colored concrete retains at least 80% of the colorant component. 
     
     
         30 . The method of  claim 28 , wherein the intentionally colored concrete floor retains at least 90% of the colorant component. 
     
     
         31 . The method of  claim 28 , wherein the intentionally colored concrete floor retains at least 95% of the colorant component. 
     
     
         32 . The method of  claim 28 , wherein the intentionally colored concrete floor retains at least 99% of the colorant component 
     
     
         33 . A spent coating removal composition exhibiting an absorbance of less than 0.05 in the wavelength range of 360 to 1100 nm.