Chrome-free methods of etching organic polymers
View Patent ↗A chrome-free composition of an acidic suspension of manganese compounds and manganese ions are applied to an organic polymer surface to etch the surface. The etched surface is then plated with metal.
1. A method comprising:
a. providing a substrate comprising one or more organic polymers;
b. providing a composition comprising a suspension of one or more undissolved Mn(II) compounds, or one or more undissolved Mn(III) compounds, or mixtures thereof, dissolved Mn(II) ions and dissolved Mn(III) ions, and one or more acids; and
c. contacting the substrate comprising the one or more organic polymers with the composition to etch a surface of the substrate.
2. The method of claim 1 , wherein a total amount of Mn(II) are at a concentration of at least 0.1 mmol/L.
3. The method of claim 1 , wherein a total amount of Mn(III) are at a concentration of at least 0.01 mmol/L.
4. The method of claim 1 , wherein Mn(II) are oxidized to Mn(III) by electrolysis.
5. The method of claim 1 , wherein Mn(II) are oxidized to Mn (III) by an oxidizing agent.
6. The method of claim 1 , wherein a temperature of the composition ranges from 10° C. to 135° C.
7. The method of claim 1 , wherein the substrate is contacted with the composition for 10 seconds to 30 minutes.
8. The method of claim 1 , wherein the composition further comprises one or more catalysts.
9. The method of claim 8 , wherein the catalyst is chosen from Ag(I), Bi(III), Ce(III) and Pb(II).
10. A composition comprising a suspension of one or more undissolved Mn(II) compounds, or one or more undissolved Mn(III) compounds, or mixtures thereof, dissolved Mn(II) ions and dissolved Mn(III) ions, and one or more acids.