US 12,208,567 B2
Three-dimensional inkjet printing of a thermally stable object
Lev Kuno, Tzur-Hadassah (IL)
Assigned to Stratasys Ltd., Rehovot (IL)
Filed by Stratasys Ltd., Rehovot (IL)
Filed on Mar. 27, 2023, as Appl. No. 18/126,512.
Application 17/561,764 is a division of application No. 17/280,956, granted, now 11,235,511, issued on Feb. 1, 2022, previously published as PCT/IL2019/051070, filed on Sep. 27, 2019.
Application 18/126,512 is a continuation of application No. 17/561,764, filed on Dec. 24, 2021, granted, now 11,613,071.
Claims priority of provisional application 62/738,084, filed on Sep. 28, 2018.
Prior Publication US 2023/0226747 A1, Jul. 20, 2023
Int. Cl. B29C 64/112 (2017.01); B33Y 10/00 (2015.01); B33Y 70/00 (2020.01); C08L 79/04 (2006.01); C09D 11/101 (2014.01); C09D 11/38 (2014.01)
CPC B29C 64/112 (2017.08) [B33Y 70/00 (2014.12); C09D 11/38 (2013.01); B33Y 10/00 (2014.12); C08L 79/04 (2013.01); C09D 11/101 (2013.01)] 23 Claims
OG exemplary drawing
 
1. A method of fabricating a three-dimensional object by three-dimensional inkjet printing, the object comprising, in at least a portion thereof, a cyanate ester-containing polymeric network, the method comprising sequentially forming a plurality of layers in a configured pattern corresponding to the shape of the object, thereby fabricating the object,
wherein a formation of at least a portion of said layers comprises dispensing a first modeling material formulation, a second modeling material formulation and a third modeling material formulation, said dispensing being configured such that said first and second modeling material formulations form an inner region and said third modeling material formulation forms an outer region enveloping at least a portion of said inner region,
the method further comprising exposing each of said layers to a first curing condition, said first curing condition comprising irradiation; and
collectively exposing said plurality of layers to a second curing condition which comprises heat energy,
wherein:
said first modeling material formulation comprises a first curable material being a thermally-curable cyanate ester and a photoinitiator;
said second modeling material formulation comprises an activating agent for promoting polymerization of said cyanate ester, said activating agent being an aromatic amine, and a second curable material being a photocurable material comprising at least one multi-functional acrylic material that features, when hardened, a Tg of at least 150° C., and is devoid of said first curable material; and
said third modeling material formulation comprises a third curable material which is curable upon exposure to said first curing condition,
thereby fabricating the three-dimensional object.