Removal of metallic coatings from polymeric substrates
AssigneeMorris Resources, Inc.
InventorDavid L. Personette
Life of this patent
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Abstract
A method for removing metallic coatings from polymeric substrates is provided. The method comprises contacting a metallic-coated polymeric substrate with an aqueous solution consisting essentially of from about 0.75 to about 11.25 weight percent trisodium phosphate and from about 0.75 to about 11.25 weight percent of an alkali metal hydroxide for a period of time effective to remove the metallic coating and produce a polymeric substrate substantially free of metal constituents and binder materials. The polymeric substrate and the metal constituents present in the metallic coating are recovered and reclaimed. A composition for removing the metallic coating from a metallic-coated polymeric substrate is also provided.
Claims19
A method for removing metallic coatings from polymeric substrates so that metal constituents present in the coating and a substantially coating-free substrate can be recovered, said metallic coating comprises:
- metals or metal oxides selected from the group consisting essentially of iron oxide, chromium dioxide, titanium dioxide, cobalt and silver the method comprising:
- introducing a metallic-coated polymeric substrate into a treatment vessel containing an aqueous solution consisting essentially of from about 0.75 to about 11.25 weight percent trisodium phosphate and from about 0.75 to about 11.25 weight percent of an alkali metal hydroxide for a period of time effective to remove the metallic coating;
- and
- recovering from the treatment vessel separated metallic constituents and the coating-free polymeric substrate.
A method for removing metallic coatings from a polymeric substrate, said metallic coating comprises:
- metals or metal oxides selected from the group consisting essentially of iron oxide, chromium dioxide, titanium dioxide, cobalt and silver, comprising:
- contacting a metallic-coated polymeric substrate with an aqueous solution consisting essentially of from about 0.75 to about 11.25 weight percent trisodium phosphate and from about 0.75 to about 11.25 weight percent of an alkali metal hydroxide in a treatment vessel for a period of time effective to remove the metallic coating and provide a coating-free polymeric substrate substantially free of metal constituents and binder materials, the aqueous solution being maintained at a temperature of from about 160.degree. F. to about 215.degree. F.;
- rinsing the coating-free polymeric substrate to remove residual aqueous solution therefrom;
- and
- drying the rinsed, coating-free polymeric substrate to provide a dried coating-free polymeric substrate.
An aqueous composition for removing a metallic coating from a metallic-coated polymeric substrate so as to provide a polymeric substrate substantially free of metal constituents and binder materials present in the metallic coating, said metallic coating comprises:
- metals or metal oxides selected from the group consisting essentially of iron oxide, chromium dioxide, titanium dioxide, cobalt and silver, the aqueous composition consisting essentially of from about 0.75 to about 11.25 weight percent trisodium phosphate and from about 0.75 to about 11.25 weight percent of an alkali metal hydroxide.
Dependencies are inferred from the claim text.