Patent ID: 8293448

Claim:
A resin composition for stereolithography, comprising an oxetane compound expressed by formula (I): wherein R 1 denotes an alkyl group having 1 to 5 carbon atoms, and R 2 denotes an alkylene group having 2 to 10 carbon atoms that may contain an ether bond, in the proportion of from 3 to 60 mass % based on the total mass of the resin composition for stereolithography, a cationically polymerizable organic compound other than the oxetane compound expressed by the general formula (I), an active energy ray sensitive cationic polymerization initiator, a radical polymerizable organic compound, and an active energy ray sensitive radical polymerization initiator; wherein based on the total mass of the resin composition for stereolithography, a content of the cationically polymerizable organic compound other than the oxetane compound expressed by the general formula (I) is from 20 to 70 mass %, a content of the radical polymerizable organic compound is from 5 to 50 mass %, a content of the active energy ray sensitive cationic polymerization initiator is from 1 to 10 mass %, and a content of the active energy ray sensitive radical polymerization initiator is from 1 to 10 mass %; wherein the cationically polymerizable organic compound other than the oxetane compound expressed by formula (I) comprises an epoxy compound; and the radical polymerizable organic compound comprises an ethylenic unsaturated compound.