| abstract |
A model material resin composition 4a used for shaping a model material 4 by an inkjet optical shaping method, the model material resin composition 4a containing (A) an ethylenically unsaturated monomer as a photocuring component, (B) a photopolymerization initiator, and (C) a surface conditioner, the model material resin composition 4a having a surface tension Mt of 26.0 to 33.0 mN/m, and the surface tension Mst represented by formula (i) being 33.0 mN/m or greater.　Through use of this model material resin composition 4a, an optically shaped article having good dimensional precision can be obtained. |