US 11,945,943 B2
Binder composition for additive manufacturing
Christopher Benjamin Renner, Cambridge, MA (US); Ilya L. Rushkin, Acton, MA (US); Robert J. Nick, Pepperell, MA (US); and Emanuel M. Sachs, Newton, MA (US)
Assigned to Desktop Metal, Inc., Burlington, MA (US)
Filed by Desktop Metal, Inc., Burlington, MA (US)
Filed on Aug. 20, 2020, as Appl. No. 16/998,527.
Claims priority of provisional application 62/924,093, filed on Oct. 21, 2019.
Claims priority of provisional application 62/890,871, filed on Aug. 23, 2019.
Prior Publication US 2021/0053113 A1, Feb. 25, 2021
Int. Cl. B33Y 10/00 (2015.01); B22F 1/10 (2022.01); B22F 1/103 (2022.01); B22F 10/00 (2021.01); B33Y 70/10 (2020.01); B33Y 80/00 (2015.01); C08L 33/02 (2006.01)
CPC C08L 33/02 (2013.01) [B22F 1/10 (2022.01); B22F 1/103 (2022.01); B22F 10/00 (2021.01); B33Y 10/00 (2014.12); B33Y 70/10 (2020.01); B33Y 80/00 (2014.12); B22F 2301/255 (2013.01); C08L 2312/00 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method of additive manufacturing a metal-based composite structure by binder jet printing, the method comprising:
depositing a first layer of metal powder;
depositing a binder composition on at least a portion of the first layer of metal powder, the binder composition comprising:
water,
an adhesion promoter that is a small molecule, the adhesion promoter comprising a thiol group, and
a low molecular weight polymer including an acrylic acid repeat unit, wherein the binder composition has a pH of greater than or equal to 4; and
drying and/or cross-linking at least the binder composition deposited on the first layer of the metal powder, thereby forming a metal-based composite structure.