Copper ink for high conductivity fine printing
OwnerBhavana Deore, Chantal Paquet +1inventors
InventorsBhavana Deore, Chantal Paquet, Patrick Roland Lucien Malenfant
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Abstract
A copper-based ink contains copper acetate, 3-dimethylamino-1,2-propanediol and a silver salt. The ink may be coated on a substrate and decomposed on the substrate to form a conductive copper coating on the substrate. The ink provides micron-thick traces and may be screen printed and thermally sintered in the presence of up to about 500 ppm of oxygen or photo-sintered in air to produce highly conductive copper features. Sintered copper traces produced from the ink have improved air stability, and have improved sheet resistivity for 5-20 mil wide screen-printed lines with excellent resolution.
Claims16
A method of producing a conductive copper coating on a substrate, the method comprising:
- coating a substrate with a copper-based ink comprising copper acetate, 3-dimethylamino-1,2-propanediol and a silver salt, wherein the copper acetate and 3-dimethylamino-1,2-propanediol are in a molar ratio of about 1:1 to about 1:2;
- and, decomposing the ink on the substrate to form a conductive copper coating on the substrate, wherein the decomposing comprises thermal sintering in the presence of oxygen in an amount of 100 ppm to about 500 ppm of oxygen or photo-sintering in air, wherein the ink further comprises a solvent and a binder, the binder comprising a hydroxyl- and/or carboxyl-terminated polyester.
A copper-based ink comprising copper acetate, 3-dimethylamino-1,2-propanediol and a silver salt, wherein the copper acetate and 3-dimethylamino-1,2-propanediol are in a molar ratio of about 1:1 to about 1:2, wherein the ink is thermally sinterable in the presence of oxygen in an amount of 100 ppm to about 500 ppm of oxygen or photo-sinterable in air to produce conductive copper features, wherein the ink further comprises a solvent and a binder, the binder comprising a hydroxyl- and/or carboxyl-terminated polyester.
Dependencies are inferred from the claim text.