Conductive article having silver nanoparticles
View Patent ↗A conductive article includes a metal nanoparticle composition formed on a substrate. The metal nanoparticle composition includes silver nanoparticles and a polymer having both carboxylic acid and sulfonic acid groups. The weight ratio of the polymer to silver is 0.0005 to 0.04.
1. A conductive article comprising a dried aqueous metal nanoparticle composition formed on a substrate wherein the metal nanoparticle composition includes silver nanoparticles and a polymer having both carboxylic acid and sulfonic acid groups,
wherein the polymer is selected from the group consisting of poly(4-styrene sulfonic acid-co-maleic acid) and poly(4-styrene sulfonic acid-co-acrylic acid),
wherein the weight ratio of the polymer to silver is from 0.0005 to 0.04.
2. The conductive article of claim 1 wherein the sulfonic acid group is formed from styrenesulfonic acid, 3-sulfopropyl acrylate, 3-sulfopropyl methacrylate, 2-sulfoethyl methacrylate, 3-sulfobutyl methacrylate, or 2-acrylamido-2-methylpropane sulfonic acid.
3. The conductive article of claim 1 wherein the carboxylic acid group is formed from acrylic acid, methacrylic acid, ethacrylic acid, itaconic acid, maleic acid, fumaric acid, monoalkyl itaconate, monoalkyl maleate, citraconic acid, styrenecarboxylic acid, 2-carboxyethyl acrylate or 2-carboxyethyl acrylate oligomers.
4. The conductive article of claim 1 wherein the molar ratio of sulfonic acid groups to carboxylic acid groups is in a range of 0.05 to 5.
5. The conductive article of claim 4 wherein the molar ratio of sulfonic acid groups to carboxylic acid groups is in a range of 0.5 to 2.
6. The conductive article of claim 1 wherein the weight ratio of the polymer to silver is from 0.008 to 0.02.
7. The conductive article of claim 1 wherein the mean size of the silver nanoparticles is in a range from 5 nm to 500 nm.
8. The conductive article of claim 7 wherein the dried aqueous silver nanoparticle composition has a bimodal particle size distribution.
9. The conductive article of claim 1 wherein the dried aqueous metal nanoparticle composition further includes a colorant.
10. The conductive article of claim 1 wherein the average molecular weight of the polymer is in a range from 500 to 500,000.
11. The conductive article of claim 1 wherein the average molecular weight of the polymer is in a range from 500 to 50,000.
12. The conductive article of claim 1 wherein the substrate includes a halogen-containing polymer in contact with the silver nanoparticles.
13. The conductive article of claim 12 wherein the substrate includes a layer having the halogen-containing polymer, and the halogen-containing polymer includes polyvinyl chloride or polyvinylidene chloride or a combination thereof.
14. The conductive article of claim 1 wherein the substrate includes a layer having a halide that is in contact with the silver nanoparticles.
15. The conductive article of claim 1 wherein the silver nanoparticles form a conductive line having a bulk resistivity of less than 5 times that of pure silver.
16. The conductive article of claim 15 wherein the silver nanoparticles form a conductive line having a bulk resistivity of less than 4 times that of pure silver.
17. The conductive article of claim 15 wherein the silver nanoparticles form a conductive line having a bulk resistivity of less than 3 times that of pure silver.