	US 12,269,958 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 May 3, 2024, as Appl. No. 18/654,201.
Application 18/654,201 is a continuation of application No. 18/326,535, filed on May 31, 2023, granted, now 12,018,165.
Application 18/326,535 is a continuation of application No. 17/832,129, filed on Jun. 3, 2022, granted, now 11,702,559, issued on Jul. 18, 2023.
Application 17/832,129 is a continuation of application No. 16/182,926, filed on Nov. 7, 2018, granted, now 11,384,250, issued on Jul. 12, 2022.
Claims priority of provisional application 62/582,631, filed on Nov. 7, 2017.
Prior Publication US 2024/0368418 A1, Nov. 7, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. B33Y 10/00 (2015.01); B29C 64/112 (2017.01); B29C 64/124 (2017.01); B33Y 70/00 (2020.01); C09D 11/037 (2014.01); C09D 11/101 (2014.01); C09D 11/107 (2014.01); C09D 11/328 (2014.01); C09D 11/38 (2014.01); B29K 33/00 (2006.01); B29K 105/00 (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)]

19 Claims

1. An ink for use in a three-dimensional printing system, the ink comprising:

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 having a Gaussian distribution of wavelengths and a peak wavelength λ;

wherein the ink has a penetration depth (D_p) and a critical energy (E_c) at the wavelength λ;

wherein the E_cof the ink is 10-30 mJ/cm²; and

wherein the ratio of D_pto E_c, in units of (μm cm²)/mJ, is between 10 and 50.