Photocurable resin composition for three-dimensional photofabrication

A photocurable resin composition for use in three-dimensional photofabrication for producing a stack having a shape corresponding to a shape of a three-dimensional object by digitizing and ordinating the three-dimensional object in a height direction of the three-dimensional object and generating two-dimensional shape data indicating a cross-sectional shape of the three-dimensional object at each ordinated height, based on three-dimensional shape data indicating the shape of the three-dimensional object, and sequentially forming and stacking fabricated layers each having a shape corresponding to a two-dimensional shape at each height based on the two-dimensional shape data, according to an order of the ordinating, using a vat photopolymerization process in which a predetermined position of a liquid photocurable resin composition held in a vat is irradiated with activating light being ultraviolet light or visible light to selectively cure the liquid photocurable resin composition present in the position;

• the composition comprising:
• 100 parts by mass of a radically-polymerizable monomer (A);
• 5.0 to 400 parts by mass of an inorganic filler (B);
• 0.05 to 5.0 parts by mass of a photopolymerization initiator (C) that absorbs the activating light to generate a radical;
• 0.01 to 2.5 parts by mass of an activating light absorbent (D) that absorbs the activating light;
• 0.01 to 5.0 parts by mass of a polymerization inhibitor (E);
• and
• 0.005 to 1.0 part by mass of a chain transfer agent (F),
• 90% by mass or more of the radically-polymerizable monomer (A) being composed of a polyfunctional (meth)acrylate type radically-polymerizable monomer (a) having two or more (meth)acryloyl groups in a molecule and having 5 to 25 atoms constituting a main chain of a divalent group interposed between the two or more (meth)acryloyl groups present in the molecule;
• and
• the polyfunctional (meth)acrylate type radically-polymerizable monomer (a) being composed of 40 parts by mass or more and less than 90 parts by mass of a polyfunctional (meth)acrylate type radically-polymerizable monomer (a1) having at least one group selected from the group consisting of a urethane group, an isocyanurate group, and a urea group, and 10 parts by mass or more and less than 60 parts by mass of another polyfunctional (meth)acrylate type radically-polymerizable monomer (a2).