Patent ID: 8344097

Claim:
A cationically polymerizable composition comprising (A) an oxetane compound as a cationically polymerizable compound, (B) a heteropolyacid as a cationic polymerization initiator, and (C) a stabilizer capable of inhibiting cationic polymerization wherein 100 parts by weight of the cationically polymerizable compound is compounded with the heteropolyacid, the stabilizer is a heteropolyacid salt capable of inhibiting cationic polymerization below a prescribed temperature; the amount of the component B to be incorporated is in the range of 0.02 to 5 parts by weight, per 100 parts by weight of the component A, and the amount of the component C to be incorporated is 1 to 50 parts by weight, per 100 parts by weight of the component B.