Abstract: Provided is an ink composition containing: as a first component, at least one inorganic filler having an average particle diameter of 1 to 30 nm; as a second component, at least one monomer selected from (meth)acrylate-based monomers; and as a third component, at least one polymerization initiator, in which the total weight concentration of the first to third components is 98 to 100% by weight relative to the total weight of the ink composition. The ink composition brings about a cured film having a high refractive index, a high transmittance, high flexibility, and/or a dielectric constant.

Abstract: A thermosetting composition containing a compound (A) and a compound (B) is described, wherein the compound (A) is a carboxylic acid ester having at least one group represented by formula (1): and the compound (B) is a diamine. In formula (1), R1 is alkyl having 1 to 10 carbons, R2 is independently alkylene having 2 or 3 carbons, and n is an integer of 1 to 3.