| abstract |
Disclosed is a cationic curable composition that forms a cured product such as a film that has excellent curability, can easily control the thermal expansion coefficient, and is excellent in heat resistance and scratch resistance. The cationic curable composition of the present invention comprises a polyorganosiloxane having an oxetanyl group and substantially no hydrolyzable group, a cationic polymerizable monomer, a cationic polymerization initiator, and an inorganic filler. (Silica and the like). The polyorganosiloxane having an oxetanyl group is a hydrolysis-condensation product of an organic silicon-containing compound represented by the following general formula (1) or the organic silicon-containing compound and a siloxane bond-forming group and an oxetanyl group. It is preferably a hydrolytic condensate with an organic silicon-containing compound. [Chemical 1] [Selection figure] None |