Patent ID: 8735462

Claim:
A radical-polymerizable resin composition comprising a radical-polymerizable resin, a silane coupling agent, and a radically polymerizable monomer; wherein the radical-polymerizable resin is obtained through cationic polymerization of a first compound in combination with a second compound, the first compound being at least one compound selected from compounds each represented by one of the following Formulae (1a) and (1b): wherein R a , R b , R e , R d , R e , and R f are the same as or different from one another and each represent hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms and optionally containing an oxygen atom, where at least one of R a , R b , R c , and R d , and at least one of R e and R f are each independently a hydrocarbon group having 4 to 20 carbon atoms and optionally containing an oxygen atom, where at least two of R a , R b , R c , and R d , together with the adjacent one or two carbon atoms, may be linked to form a ring, and where R e and R f , together with the adjacent carbon atom, may be linked to form a ring, and the second compound being at least one compound selected from compounds each represented by one of following Formulae (2a) to (2f): wherein R x represents hydrogen atom or methyl group; R 1 , R 2 , R 3 , and R 4 each independently represent hydrogen atom or a hydrocarbon group having 1 to 5 carbon atoms; A 1 represents single bond, an alkylene group having 1 to 5 carbon atoms, an alkyleneoxyalkylene group having 1 to 5 carbon atoms, or an alkyleneoxy group having 1 to 5 carbon atoms, where the oxygen atom of the alkyleneoxy group is bound to the ring in the formula; and A 2 represents an alkylene group having 1 to 3 carbon atoms, and the radical-polymerizable resin being liquid at 0° C. and having a weight-average molecular weight of 500 or more; wherein the silane coupling agent is represented by the following Formula (3): wherein R x represents hydrogen atom or methyl group; A 3 represents a hydrocarbon group having 1 to 20 carbon atoms; and R g , R h , and R i are the same as or different from one another and each represent an alkoxy group having 1 to 3 carbon atoms or an alkyl group having 1 to 3 carbon atoms, where at least one of R g , R h , and R i is an alkoxy group having 1 to 3 carbon atoms; and wherein the radically polymerizable monomer has two to six radically polymerizable functional groups.