Photocurable compositions with dispersed carbon-coated metal particles

A non-aqueous photocurable composition comprising:

• (a) a photopolymerizable epoxy material,
• (b) a photoacid generator,
• (c) an optional electron donor photosensitizer, and
• (d) 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 the dispersed carbon-coated metal particles having a median diameter of less than 0.6 μm, and being dispersed with a particle dispersing agent that has a weight average molecular weight (Mw) 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,
• (e) an organic diluent,
• (f) optionally, one or more free-radically polymerizable materials, and
• (g) optionally, one or more free radical photoinitiators,
• wherein, when the non-aqueous photocurable composition contains up to and including 25 weight % of the dispersed carbon-coated metal particles, it exhibits no visual settling when subjected to a settling test of at least 24 hours at 20° C.