Photo-curable resin compositions containing impact modifier for three dimensional printing and cured dental product made of the same

A photocurable composition comprising:

• about 45 to about 55 weight % of aromatic urethane di(meth)acrylate monomer having two urethane linkages and two acryloyloxy groups;
• about 20 to about 30 weight % of monofunctional (meth)acrylate monomer having acryloyl groups;
• about 8 to about 18 weight % of bifunctional (meth)acrylate monomer having ethoxy groups;
• about 5 to about 15 weight % of impact modifier having core-shell structure;
• about 0.2 to about 5.0 weight % of at least one kind of ultraviolet/visible (UV/Vis) light-photo-polymerization initiator;
• and
• at least one colorant,
• wherein the aromatic urethane di(meth)acrylate monomer having two urethane linkages and two acryloyloxy groups is a compound represented by the following formula (1):
• wherein two substitutions on aromatic ring are either ortho, meta or para positions;
• R1 is a divalent chain hydrocarbon groups having 2 to 8 carbon atoms and do not have a substituent;
• and R2 independently represents a hydrogen atom or a methyl group.