Patent ID: 8338074

Claim:
A resin composition for stereolithography, which is an actinic radiation-curable resin composition comprising: a cationic-polymerizable organic compound comprising at least one compound having an epoxy group; a radical-polymerizable organic compound comprising at least one compound having a (meth)acryl group; a photo initiator for cationic polymerization; and an ultraviolet light-sensitive photo initiator for radical polymerization, wherein the photo initiator for cationic polymerization comprises a compound represented by the following formula (I), the compound having a purity of 95% or higher and containing 5% by mass or less of a compound represented by the following formula (II): wherein M represents an antimony atom; and the broken line between S + and MF 6 − represents an ionic bond, and wherein the photo initiator for cationic polymerization is the only component in the composition dissolved or dispersed in propylene carbonate or ethylene carbonate prior to being combined with the other components to form the resin composition.