Conductive ink formulations
View Patent ↗A conductive ink formulation comprising silver, at least one first solvent, and a cross link wherein the cross link agent is present in an amount of about 1.5 wt % to about 6 wt % based on total weight of the formulation. The conductive ink formulation is suitable for printing on polymer film substrates, in particular with a gravure printing method. The polymer film substrates may be then applied to other substrates, for example glass substrates, by any suitable process such as lamination.
1. A conductive ink formulation comprising silver, a solvent mixture, and a cross link agent, wherein the silver is present in an amount of about 50 wt % to about 75 wt % based on total weight of the conductive ink formulation, the solvent mixture is present in an amount of about 25 wt % to 35 wt %, and the cross link agent is present in an amount of about 1.5 wt % to about 6 wt % based on total weight of the formulation.
2. The conductive ink formulation of claim 1 wherein the cross link agent is present in an amount of about 2 wt % to about 4 wt % based on total weight of the formulation.
3. The conductive ink formulation of claim 1 wherein the cross link agent is present in an amount of about 2 wt % to about 3.5 wt % based on total weight of the formulation.
4. The conductive ink formulation of claim 1 wherein the cross link agent comprises an isocyanate and a second solvent.
5. The conductive ink formulation of claim 4 wherein the cross link agent comprises about 45 wt % isocyanate and about 55 wt % solvent.
6. The conductive ink formulation of claim 4 wherein the isocyanate is 1,3,5-Tris(6-isocyanatohexyl) biuret.
7. The conductive ink formulation of claim 4 wherein the solvent is ethyl acetate.
8. The conductive ink formulation of claim 1 wherein the solvent mixture is selected from the group consisting of a mixture of n-propyl acetate and n-butyl acetate, and a mixture of n-propyl acetate and methyl propyl ketone.
9. The conductive ink formulation of claim 8 wherein the solvent mixture is a combination of n-propyl acetate and methyl propyl ketone.
10. A polymer film substrate printed with a conductive ink formulation comprising silver, a solvent mixture, and a cross link agent, wherein the silver is present in an amount of about 50 wt % to about 75 wt % based on total weight of the conductive ink formulation, the solvent mixture is present in an amount of about 25 wt % to 35 wt %, and the cross link agent is present in an amount of about 1.5 wt % to about 6 wt % based on total weight of the formulation.
11. The polymer film substrate of claim 10 wherein the substrate is printed with the conductive ink formulation in a pattern.
12. A glass panel comprising a polymer film substrate thereon wherein the polymer film substrate is printed with a conductive ink formulation comprising silver, a solvent mixture, and a cross link agent, wherein the silver is present in an amount of about 50 wt % to about 75 wt % based on total weight of the conductive ink formulation the solvent mixture is present in an amount of about 25 wt % to 35 wt %, and the cross link agent is present in an amount of about 1.5 wt % to about 6 wt % based on total weight of the formulation.
13. A method of printing comprising printing a conductive ink formulation onto to a polymer film substrate wherein the conductive film formulation comprises silver, a solvent mixture, and a cross link, wherein the silver is present in an amount of about 50 wt % to about 75 wt % based on total weight of the conductive ink formulation, the solvent mixture is present in an amount of about 25 wt % to 35 wt %, and the cross link agent is present in an amount of about 1.5 wt % to about 6 wt % based on total weight of the formulation.
14. The method of claim 13 wherein the printing method is a gravure printing method.
15. A method of forming a glass panel comprising
i. printing a conductive ink formulation onto to a polymer film substrate to form a conductive ink pattern, wherein the conductive film formulation comprises silver, a solvent mixture, and a cross link agent, wherein the silver is present in an amount of about 50 wt % to about 75 wt % based on total weight of the conductive ink formulation, the solvent mixture is present in an amount of about 25 wt % to 35 wt %. and the cross link agent is present in an amount of about 1.5 wt % to about 6 wt % based on total weight of the formulation, and
ii. applying the polymer film substrate to a glass substrate to form the panel.
16. The method of forming a glass panel of claim 15 further comprising electroplating the glass panel over the conductive ink pattern.