Resin composition comprising coated metal oxide particles, resin-attached metal foil, metal-clad laminated sheet, and capacitor element

A resin composition comprising:

• coated particles, each comprising a core containing a metal oxide and a coating layer containing an aluminum hydrous oxide and provided on a surface of the core;
• and
• a resin,
• wherein the metal oxide is represented by MxOy, where M represents at least one element selected from the group consisting of Ba, Ti, Sr, Pb, Zr, La, Ta, Ca, and Bi, and x and y each represent a number determined from a stoichiometric ratio according to the valence of the metal element M,
• the resin composition has an atomic ratio Al/(M+Al) of 0.05 or more and 0.7 or less, as determined by XPS for the particles contained in the resin composition, and
• a proportion of an aluminum element is 0.2 mass % or more and 3.0 mass % or less, based on the mass of all particles contained in the resin composition.