US 12,252,561 B2
Liquid, hybrid UV/VIS radiation curable resin compositions for additive fabrication
Tai Yeon Lee, Elgin, IL (US)
Assigned to STRATASYS, INC., Eden Prairie, MN (US)
Filed by STRATASYS, INC., Eden Prairie, MN (US)
Filed on Nov. 22, 2023, as Appl. No. 18/517,323.
Application 18/517,323 is a division of application No. 17/637,161, granted, now 11,866,526, previously published as PCT/EP2020/048672, filed on Aug. 31, 2020.
Claims priority of provisional application 62/893,969, filed on Aug. 30, 2019.
Prior Publication US 2024/0092946 A1, Mar. 21, 2024
Int. Cl. C08F 2/46 (2006.01); B29C 64/129 (2017.01); C08F 2/50 (2006.01); C08F 222/10 (2006.01); C08G 59/24 (2006.01); C08G 61/04 (2006.01); C08K 5/03 (2006.01); C08K 5/55 (2006.01); B33Y 10/00 (2015.01); B33Y 70/00 (2020.01); B33Y 80/00 (2015.01)
CPC C08F 2/50 (2013.01) [B29C 64/129 (2017.08); C08F 222/102 (2020.02); C08G 59/24 (2013.01); C08K 5/03 (2013.01); C08K 5/55 (2013.01); B33Y 10/00 (2014.12); B33Y 70/00 (2014.12); B33Y 80/00 (2014.12); C08K 2201/019 (2013.01)] 20 Claims
 
1. A method of forming a three-dimensional article via an additive fabrication system utilizing a composition, wherein the composition is a radiation curable composition comprising a cationically curable constituent and a free-radically curable constituent, said composition further comprising at least a first photoinitiator that is an iodonium salt of a non-fluorinated borate anion, and a photosensitizer, the method comprising:
(1) providing the radiation curable composition for additive fabrication;
(2) establishing a first liquid layer of the radiation curable composition;
(3) exposing the first liquid layer to actinic radiation via a UV/vis optics configuration to form an imaged cross-section, thereby forming a first cured layer;
(4) forming a new liquid layer of the radiation curable composition in contact with the first cured layer;
(5) exposing the new liquid layer to actinic radiation to form an additional imaged cross- section; and
(6) repeating steps (4) and (5) a pre-determined number of times to form a three- dimensional article.