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AssigneesGroupe Graham International Inc., National Research Council of Canada
InventorsArnold Kell, Sylvie Lafreniere, Chantal Paquet, Patrick Malenfant, Olga Mozenson
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A flake-less molecular ink suitable for printing (e.g. screen printing) conductive traces on a substrate has 30-60 wt % of a C8-C12 silver carboxylate or 5-75 wt % of bis(2-ethyl-1-hexylamine) copper (II) formate, bis(octylamine) copper (II) formate or tris(octylamine) copper (II) formate, 0.1-10 wt % of a polymeric binder (e.g. ethyl cellulose) and balance of at least one organic solvent. Conductive traces formed with the molecular ink are thinner, have lower resistivity, have greater adhesion to a substrate than metal flake inks, have better print resolution and are up to 8 times less rough than metal flake inks. In addition, the shear force required to remove light emitting diodes bonded to the traces using Loctite 3880 is at least 1.3 times stronger than for commercially available flake-based inks.
A molecular ink comprising a flake-less printable composition of 30-60 wt % of a C8-C12 silver carboxylate, 0.1-10 wt % of a polymeric binder and balance of at least one organic solvent, all weights based on total weight of the composition, wherein the binder is ethyl cellulose and ethyl cellulose has an average weight average molecular weight in the range of 60,000-95,000 g/mol and a bimodal molecular weight distribution, wherein the ethyl cellulose comprises a mixture of ethyl celluloses comprising a first ethyl cellulose having a weight average molecular weight in the range of from 60,000-70,000 g/mol and a second ethyl cellulose having a weight average molecular weight in the range of from 90,000-100,000 g/mol and wherein the at least one organic solvent comprises terpineol and xylene.
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