	US 11,939,418 B2
	Photo-curable compositions
Liang Chen, Sewickley, PA (US); Alan D. Bushmire, Canonsburg, PA (US); and Vahid Karimkhani, Pittsburgh, PA (US)
Assigned to STRATASYS, INC., Eden Prairie, MN (US)
Filed by STRATASYS, INC., Eden Prairie, MN (US)
Filed on Dec. 15, 2021, as Appl. No. 17/551,298.
Prior Publication US 2023/0183411 A1, Jun. 15, 2023
Int. Cl. C08G 18/10 (2006.01); B33Y 70/00 (2020.01); C08G 18/32 (2006.01); C08J 3/24 (2006.01); C08J 3/28 (2006.01)

CPC C08G 18/10 (2013.01) [B33Y 70/00 (2014.12); C08G 18/3221 (2013.01); C08J 3/24 (2013.01); C08J 3/28 (2013.01); C08J 2375/06 (2013.01)]

20 Claims

1. A photo-curable composition, comprising:

a photo-curable resin comprising:

a first prepolymer having a number average molecular weight of ≤2000 g/mol, said first prepolymer being a reaction product of a first reaction mixture comprising:

a cycloaliphatic diisocyanate,

a hydroxy-functional (meth)acrylate, and

an isocyanate-reactive component, and

a second prepolymer having a number average molecular weight of 2000 g/mol to 10,000 g/mol, said second prepolymer being a reaction product of a second reaction mixture comprising:

a (meth)acrylate, and

a polyactive-hydrogen compound, and

a reactive diluent comprising a (meth)acrylate monomer and/or (meth)acrylate prepolymer; and

a photoinitiator,

wherein the photo-curable composition has a shear viscosity of less than 1 Pa·s at 100° C. at a shear rate of 50 s⁻¹.