US 12,291,603 B2
Additive manufacturing employing solvent-free polyimide-containing formulations
Lev Kuno, Tzur-Hadassah (IL); Mariana Pokrass, Rehovot (IL); and Elena Shpayzer, Rehovot (IL)
Assigned to Stratasys Ltd., Rehovot (IL)
Appl. No. 16/958,169
Filed by Stratasys Ltd., Rehovot (IL)
PCT Filed Dec. 27, 2018, PCT No. PCT/IL2018/051403
§ 371(c)(1), (2) Date Jun. 26, 2020,
PCT Pub. No. WO2019/130312, PCT Pub. Date Jul. 4, 2019.
Claims priority of provisional application 62/610,984, filed on Dec. 28, 2017.
Prior Publication US 2021/0070941 A1, Mar. 11, 2021
Int. Cl. B29C 64/00 (2017.01); B29C 64/112 (2017.01); B33Y 10/00 (2015.01); B33Y 70/00 (2020.01); C08G 73/12 (2006.01); B29K 79/00 (2006.01); B29K 105/00 (2006.01)
CPC C08G 73/128 (2013.01) [B29C 64/112 (2017.08); B33Y 10/00 (2014.12); B33Y 70/00 (2014.12); B29K 2079/08 (2013.01); B29K 2105/0002 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A formulation comprising a polyimide precursor and a multifunctional photopolymerizable material, wherein said multifunctional photopolymerizable material is represented by Formula II:

OG Complex Work Unit Chemistry
wherein:
X is selected from —O— and —O—C(═O)—;
D is a hydrocarbon chain; and
Rx and Ry are each independently selected from hydrogen, alkyl and cycloalkyl,
wherein a weight ratio of said polyimide precursor and said multifunctional photopolymerizable material in the formulation ranges from 50:50 to 90:10,
the formulation being devoid of an organic solvent and featuring a viscosity of from about 16 to about 20 centipoises at 70° C.