Patent ID: 7585611

Claim:
A photocurable and thermosetting resin composition comprising: (A) a carboxylic acid-containing photosensitive resin having at least one carboxyl group and at least two ethylenically unsaturated bonds in its molecule; (B) a filler; (C) a photopolymerization initiator; (D) a diluent; and (E) a compound having at least two cyclic ether groups and/or cyclic thioether groups in its molecule, wherein the difference between the refractive index of the carboxylic acid-containing photosensitive resin (A) and that of the filler (B) is 0.20 or less, and the average grain diameter of the filler (B) is 0.5 to 0.05 μm, wherein the photocurable and thermosetting resin composition can be developed by a diluted alkali solution, and can be pattern-formed by a laser oscillation light source of 350 to 420 nm in wavelength, wherein the content of benzene rings in the photocurable and thermosetting resin composition is 20 parts by mass or less per 100 parts by mass of the total amount of the carboxylic acid-containing photosensitive resin (A) and the diluent (D), and wherein the filler (B) comprises at least one of silica or barium sulfate.