Articles containing carbon-coated metal particles
View Patent ↗Articles can be formed with either a dried layer or a dried pattern of a non-aqueous photocurable composition on one or both sides of a substrate. This composition includes a photocurable component and dispersed carbon-coated metal particles present in an amount of at least 10 weight % based on the total weight of the non-aqueous photocurable composition. The dispersed carbon-coated metal particles have a median diameter of less than 0.6 μm, and a particle dispersing agent that has a weight average molecular weight (M w ) of at least 2,000 and up to and including 10,000 and comprises nitrogen-containing units, the median diameter being determined using a dynamic light scattering method. Such articles can be used for various purposes including the formation of electrically-conductive grids, and can be incorporated into various devices including those having touch screen displays.
1. An article comprising a substrate and having on one or both supporting sides of the substrate, either a dried layer or a dried pattern of a non-aqueous photocurable composition that comprises a photocurable component and dispersed carbon-coated metal particles present in an amount of at least 10 weight % based on the total weight of the non-aqueous photocurable composition, and a particle dispersing agent that has a weight average molecular weight (M w ) of at least 2,000 and up to and including 100,000 and comprises nitrogen-containing units, the median diameter being determined using a dynamic light scattering method,
wherein:
the dispersed carbon-coated metal particles are dispersed carbon-coated silver particles or dispersed carbon-coated copper particles, or a mixture of both dispersed carbon-coated silver particles and dispersed carbon-coated copper particles, and
when the dispersed carbon-coated metal particles are dispersed at 50 weight % in 1-methoxy-2-propanol at a 20:1 weight ratio of the dispersed carbon-coated metal particles to the particle dispersing agent, the median diameter of the dispersed carbon-coated metal particles is less than 0.25 μm, the median diameter being determined using a dynamic light scattering method.
2. The article of claim 1 , wherein the substrate is a continuous polymeric web.
3. The article of claim 1 , wherein the substrate comprises a metal, glass, paperstock, or ceramic.
4. The article of claim 1 , wherein the non-aqueous photocurable composition has a weight ratio of the particle dispersing agent to the dispersed carbon-coated metal particles of at least 1:100 and up to and including 30:100.
5. The article of claim 1 , wherein the particle dispersing agent has an M w of at least 2,000 and up to and including 50,000.
6. The article of claim 1 , wherein the non-aqueous photocurable composition further comprising dispersed carbon black in an amount of up to and including 20 weight %, based on the total weight of the non-aqueous photocurable composition.
7. The article of claim 1 , wherein the particle dispersing agent is an organic polymer comprising ester units.
8. The article of claim 1 , wherein the particle dispersing agent is an organic polymer that comprises units chosen from at least one of the following classes (i) through (iv):
(i) pyridine units;
(ii) imine units;
(iii) imide units; and
(iv) amine segments.
9. The article of claim 1 , wherein the dispersed carbon-coated metal particles are dispersed carbon-coated silver particles that are present in the non-aqueous photocurable composition at a concentration is at least 15 weight % and up to and including 60 weight % based on the total weight of the non-aqueous photocurable composition, and the dispersed carbon-coated silver particles have a median diameter of less than 0.21 μm as determined using a dynamic light scattering method.
10. The article of claim 1 , wherein the photocurable component is a UV-curable component.
11. The article of claim 1 , wherein the photocurable component comprises one or more free-radically polymerizable materials and one or more free radical photoinitiators.
12. The article of claim 1 , wherein the photocurable component comprises a photopolymerizable epoxy material having at least two polymerizable epoxy groups per molecule, and a photoacid generator.
13. The article of claim 1 , wherein the substrate is a continuous polymeric web and the non-aqueous photocurable composition is disposed as multiple patterns on both supporting sides of the substrate.
14. An article comprising a substrate and having on one or both supporting sides of the substrate, either a dried layer or a dried pattern of a photocured composition that comprises dispersed carbon-coated metal particles present in an amount of at least 10 weight % based on the total weight of the photocured composition, and a particle dispersing agent that has a weight average molecular weight (M w ) of at least 2,000 and up to and including 100,000 and comprises nitrogen-containing units, the median diameter being determined using a dynamic light scattering method,
wherein:
the dispersed carbon-coated metal particles are dispersed carbon-coated silver particles or dispersed carbon-coated copper particles, or a mixture of both dispersed carbon-coated silver particles and dispersed carbon-coated copper particles, and
when the dispersed carbon-coated metal particles are dispersed at 50 weight % in 1-methoxy-2-propanol at a 20:1 weight ratio of the dispersed carbon-coated metal particles to the particle dispersing agent, the median diameter of the dispersed carbon-coated metal particles is less than 0.25 μm, the median diameter being determined using a dynamic light scattering method.
15. The article of claim 14 , wherein the substrate is a continuous polymeric web.
16. The article of claim 14 , wherein the photocured composition further comprising dispersed carbon black in an amount of up to and including 20 weight %, based on the total weight of the non-aqueous photocurable composition.
17. The article of claim 14 , wherein the particle dispersing agent is an organic polymer that comprises units chosen from at least one of the following classes (i) through (iv):
(i) pyridine units;
(ii) imine units;
(iii) imide units; and
(iv) amine units.
18. The article of claim 14 , wherein the photocured composition is disposed as one or more patterns on one or both supporting sides of the substrate.
19. The article of claim 14 , wherein the substrate is a continuous polymeric web and the photocured composition is disposed as multiple patterns on both supporting sides of the substrate.