US 12,290,980 B2
Additive manufacturing of three-dimensional objects containing a transparent material
Avraham Levy, Petach-Tikva (IL); Diana Ravich, Natania (IL); Elena Shpayzer, Rehovot (IL); and Mariana Pokrass, Rehovot (IL)
Assigned to Stratasys Ltd., Rehovot (IL)
Filed by Stratasys Ltd., Rehovot (IL)
Filed on Jan. 19, 2022, as Appl. No. 17/578,572.
Application 17/578,572 is a continuation of application No. PCT/IL2020/050396, filed on Apr. 1, 2020.
Claims priority of provisional application 62/875,977, filed on Jul. 19, 2019.
Prior Publication US 2022/0134640 A1, May 5, 2022
Int. Cl. B29C 64/124 (2017.01); B29C 64/112 (2017.01); B33Y 40/20 (2020.01); B33Y 50/02 (2015.01); B33Y 70/00 (2020.01); C08F 2/50 (2006.01); C08F 220/18 (2006.01); C08K 5/07 (2006.01); C08K 5/5397 (2006.01); B33Y 10/00 (2015.01)
CPC B29C 64/124 (2017.08) [B29C 64/112 (2017.08); B33Y 40/20 (2020.01); B33Y 50/02 (2014.12); B33Y 70/00 (2014.12); C08F 2/50 (2013.01); C08F 220/18 (2013.01); C08K 5/07 (2013.01); C08K 5/5397 (2013.01); B29K 2995/0026 (2013.01); B33Y 10/00 (2014.12)] 15 Claims
 
1. A photocurable formulation comprising:
at least one photoinitiator in a total amount of no more than 1% by weight of the total weight of the formulation;
at least one mono-functional (meth)acrylate material featuring a molecular weight lower than 500 grams/mol, in a total amount of from 40 to 60% by weight of the total weight of the formulation, said at least one mono-functional (meth)acrylate material being selected d from non-aromatic and aromatic mono-functional (meth)acrylate material, wherein an amount of an aromatic mono-functional (meth)acrylate material is no more than 5% by weight, of a total amount of said at least one mono-functional (meth)acrylate material; and
at least one multi-functional (meth)acrylate material, in a total amount of from 40 to 60% by weight of the total weight of the formulation, wherein an average glass transition temperature Tg of said at least one multi-functional (meth)acrylate material, when hardened, is at least 24° C., and wherein each of said at least one multi-functional (meth)acrylate material features, when hardened, a glass transition temperature Tg lower than 100° C.,
wherein said at least one multi-functional (meth)acrylate material comprises:
at least one multi-functional urethane acrylate that features a molecular weight higher than 1000 grams/mol and features, when hardened, an average glass transition temperature Tg of from 30 to 60° C., in a total amount of from 15 to 40% by weight of the total weight of the formulation; and
at least one multi-functional ethoxylated (meth)acrylate material that features, when hardened, glass transition temperature Tg of from 50 to 80° C., in a total amount of from 15 to 30% by weight of the total amount of the formulation.