PURPOSE: To enhance curing velocity, thermal stability, and the like by blending together a specific polymer precursor, a two-component curing agent comprising an organic metallic salt and an onium salt, and if necessary, a photosensitizer.

CONSTITUTION: (A) (a) One or more kinds of ethylene unsaturated monomers selected from among acrylate, acrylamide, a vinyl compound, and a monomer containing two reactive groups, (b) one or more kinds of epoxy monomers, (c) a polyurethane precursor, (d) a mixture of the (a) and (c) components, and (e) a polymer precursor selected from mixtures of the (a) and (b) components, (B) 0.01-20 wt.% two-component curing agent comprising (f) an organic metallic salt and (g) an onium salt and, it necessary, (C) 0.01-10 pts. of a photosensitizer for 1 part of the (f) component are blended together to obtain a polymeric composition. If necessary, energy is applied to the composition to polymerize the same to obtain a cured composition.