PROCESS FOR PRODUCING METAL PEROXIDE FILMS
Disclosed are adhesive coating compositions containing a metal peroxide for producing clear colorless adhesive coatings on substrates, particularly micro particulate substrates. In one preferred embodiment the nanoparticle coatings are chemically active and function at a high level of efficiency due to the high total surface area of the micro particulate substrate. Also disclosed are coated substrates and compositions having nanoparticles bound to a substrate by the coating compositions.
1 . Nanoparticles of a metal or metal compound of less than 10 nanometers in size produced by a process comprising forming an aqueous solution of the peroxide of the metal or metal compound having the formula M(OOH) x where x is 2, 3, 4, or 6 from a hydroxide sol of the metal, diluting the solution to a metal peroxide concentration of between about 0.5% and about 0.85% by weight of the solution at a pH in the range of from about 4.0 to about 6.5, heating the solution to boiling for a period of from about 1 to about 4 hours, cooling the solution, reheating the solution to boiling for a period of between about 1 and about 2 hours, cooling the solution, and reheating the solution to boiling until the peroxide concentration in the solution is essentially zero and separating the nanoparticles.
2 . The product of claim 1 where the metal peroxide is selected from the group consisting of peroxides of a metal of group III of the Periodic Table.
3 . The product of claim 1 where the metal peroxide is selected from the group consisting of peroxides of a metal of group II of the Periodic Table.
4 . The product of claim 1 where the metal peroxide is selected from the group consisting of peroxides of scandium, lanthanum, yttrium, platinum, selenium, tin, vanadium, zirconium, hafnium, aluminum and iron.
5 . The product of claim 1 where the metal peroxide is Ti(OOH) 4 .
6 . Nanoparticles of a metal or metal compound of less than 10 nanometers in size produced by the process for comprising forming an aqueous solution of a metal oxy peroxide of the formula MO(OOH) x where x is 2, 3, 4, or 6, by decomposition of a solution of the peroxide of a metal or metal compound having the formula M(OOH) y where y is 2, 3, 4, or 6, which was formed from a hydroxide sol of the metal, diluting the solution of the metal oxy peroxide to a peroxide concentration of between about 0.25% and about 0.425% by weight of the solution at a pH in the range of from about 4.0 to about 6.5, heating the solution to boiling for a period of from about 1 to about 4 hours, cooling the solution to ambient temperature, reheating the solution to boiling for a period of between about 1 and about 2 hours, cooling the solution to ambient temperature, and reheating the solution to boiling until the peroxide concentration in the solution is essentially zero and separating the nanoparticles.
7 . The product of claim 6 where the metal peroxide is selected from the group consisting of peroxides of a metal of group III of the Periodic Table.
8 . The product of claim 6 where the metal peroxide is selected from the group consisting of peroxides of a metal of group II of the Periodic Table.
9 . The product of claim 6 where the metal peroxide is selected from the group consisting of peroxides of scandium, lanthanum, yttrium, platinum, selenium tin, vanadium, zirconium, hafnium, aluminum and iron.
10 . The product of claim 6 where the metal peroxide is titanium peroxy acid.