Catalyst composition and deposition method
View Patent ↗Compositions and methods for depositing one or more metal or metal alloy films on substrates. The compositions contain a catalyst, one or more carrier particles and one or more water-soluble or water-dispersible organic compounds. Metal or metal alloys may be deposited on the substrates by electroless or electrolytic deposition.
1. A method comprising:
a) applying a catalytic composition to a substrate, the catalytic composition comprises a catalyst comprising a hydrous metal oxide or hydroxide of a catalytic metal, one or more carriers having average particle sizes of from 5 nm to 900 nm and one or more aqueous based polyurethane compositions, the one or more aqueous based polyurethane compositions compose from 5 wt % to 60 wt % of the catalytic composition, the one or more carriers are included in the composition in amounts of 55 to 330 times a weight of the catalytic metal, the composition is free of organic solvents; and
b) depositing a metal or metal alloy on the substrate with the catalytic composition.
2. The method of claim 1 , further comprising a step of curing the catalyst prior to depositing the metal or metal alloy on the substrate.
3. The method of claim 1 , wherein the metal or metal alloy deposit has a surface resistance of 50 mΩ/cm 2 or less.
4. The method of claim 1 , wherein the catalytic metal comprises silver, gold, platinum, palladium, indium, rubidium, ruthenium, rhodium, osmium, iridium, copper, cobalt, nickel, or iron.
5. The method of claim 1 , wherein the carrier particles comprise multi-valent cation and anion pairs, metal oxides, silicates, silica, or mixtures thereof.
6. The method of claim 5 , wherein the multi-valent cation and anion pairs comprise water-insoluble salts of barium, calcium, magnesium, manganese, or mixtures thereof.
7. The method of claim 1 , wherein the one or more aqueous based polyurethane compositions comprise ionic aqueous dispersions of polyurethane.
8. The method of claim 7 , wherein the ionic aqueous dispersions of polyurethane are anionic, cationic or mixtures thereof.
9. The method of claim 1 , wherein the one or more aqueous based polyurethane compositions are polyurethane-polyolefin dispersions.
10. The method of claim 9 , wherein the polyurethane-polyolefin dispersions are made with isocyanate-terminated polyurethane prepolymers.
11. The method of claim 1 , wherein the one or more carriers are included in the composition in amounts of 60 to 300 times the weight of the catalytic metal.
12. The method of claim 1 , wherein a surface area of the one or more carriers is from 1000 m 2 /gm to 8000 m 2 /gm.
13. The method of claim 1 , wherein the composition is an aqueous slurry.