US 11,718,744 B2
Photo-curable resin compositions containing impact modifier for three dimensional printing and cured dental product made of the same
Jason Lee, Torrance, CA (US); Shuang Xiao, Torrance, CA (US); and Jun Kyu Park, Torrance, CA (US)
Assigned to DENTCA, Inc., Torrance, CA (US)
Filed by DENTCA, Inc., Torrance, CA (US)
Filed on Mar. 26, 2021, as Appl. No. 17/214,603.
Prior Publication US 2022/0306856 A1, Sep. 29, 2022
Int. Cl. C08L 33/14 (2006.01); A61K 6/60 (2020.01); A61K 6/62 (2020.01); A61K 6/887 (2020.01)
CPC C08L 33/14 (2013.01) 6 Claims
 
1. 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):

OG Complex Work Unit Chemistry
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.