US 11,702,559 B2
Inks for 3D printing having low print through depth
Khalil Moussa, Chapel Hill, NC (US)
Assigned to 3D SYSTEMS, INC., Rock Hill, SC (US)
Filed by 3D Systems, Inc., Rock Hill, SC (US)
Filed on Jun. 3, 2022, as Appl. No. 17/832,129.
Application 17/832,129 is a continuation of application No. 16/182,926, filed on Nov. 7, 2018, granted, now 11,384,250.
Claims priority of provisional application 62/582,631, filed on Nov. 7, 2017.
Prior Publication US 2022/0289994 A1, Sep. 15, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. C09D 11/38 (2014.01); C09D 11/328 (2014.01); C09D 11/101 (2014.01); C09D 11/107 (2014.01); B29C 64/124 (2017.01); B33Y 10/00 (2015.01); B33Y 70/00 (2020.01); C09D 11/037 (2014.01); B29C 64/112 (2017.01); B29K 105/00 (2006.01); B29K 33/00 (2006.01)
CPC C09D 11/38 (2013.01) [B29C 64/112 (2017.08); B29C 64/124 (2017.08); B33Y 10/00 (2014.12); B33Y 70/00 (2014.12); C09D 11/037 (2013.01); C09D 11/101 (2013.01); C09D 11/107 (2013.01); C09D 11/328 (2013.01); B29K 2033/12 (2013.01); B29K 2105/0032 (2013.01)] 18 Claims
 
1. A method of forming a three-dimensional article by additive manufacturing, the method comprising:
providing an ink; and
selectively curing a portion of the ink using incident curing radiation having a Gaussian distribution of wavelengths and a peak wavelength at a wavelength λ,
wherein the ink comprises
up to 80 wt. % oligomeric curable material, based on the total weight of the ink;
up to 80 wt. % monomeric curable material, based on the total weight of the ink;
up to 10 wt. % photoinitiator, based on the total weight of the ink;
up to 1 wt. % non-curable absorber material, based on the total weight of the ink; and
up to 10 wt. % one or more additional components, based on the total weight of the ink,
wherein the total amount of the oligomeric curable material, monomeric curable material, photoinitiator, non-curable absorber material, and one or more additional components is equal to 100 wt. %;
wherein the photoinitiator is operable to initiate curing of the oligomeric curable material and/or the monomeric curable material when the photoinitiator is exposed to the incident curing radiation;
wherein the ink has a penetration depth (Dp) and a critical energy (Ec) at the wavelength λ, and the ratio of Dp to Ec, in units of (μm cm2)/mJ, is between 10 and 50; and
wherein the ink has a print through depth (DPT) at the wavelength λ of less than or equal to 2×Dp.