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(57) Abstract: PROBLEM TO BE SOLVED: To provide a novel 3-substituted oxetane monomer for photoinitiated cationic polymerization, a photocurable composition containing these oxetane, a method for curing these monomers, and a polymer produced thereby. The purpose is to do. [Structure] The oxetane monomer has the formula: (In the formula, R 1 is a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, a fluorine atom, a fluoroalkyl group having 1 to 6 carbon atoms, an allyl group, an aryl group, a furyl group or a thienyl group. And R 2 is a linear or branched alkylene group, a linear or branched poly (alkyleneoxy) A group, a xylylene group, a siloxane bond and an ester bond, Z is an oxygen atom or a sulfur atom, and m is 2, 3 or 4. |