US 12,441,055 B2
Thermally crosslinkable composition for use as a binder in a binder jetting process
Sebastian Boris Hein, Lilienthal (DE); and Claus Aumund-Kopp, Bremen (DE)
Assigned to FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V., Munich (DE)
Appl. No. 17/295,178
Filed by FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V., Munich (DE)
PCT Filed Nov. 27, 2019, PCT No. PCT/EP2019/082675
§ 371(c)(1), (2) Date May 19, 2021,
PCT Pub. No. WO2020/109358, PCT Pub. Date Jun. 4, 2020.
Claims priority of application No. 10 2018 220 611.2 (DE), filed on Nov. 29, 2018.
Prior Publication US 2021/0387409 A1, Dec. 16, 2021
Int. Cl. B29C 64/165 (2017.01); B33Y 10/00 (2015.01); B33Y 70/00 (2020.01); C08G 63/12 (2006.01); C08G 69/26 (2006.01); C08G 69/28 (2006.01); C08G 69/36 (2006.01); C08G 69/44 (2006.01)
CPC B29C 64/165 (2017.08) [C08G 63/12 (2013.01); C08G 69/26 (2013.01); C08G 69/28 (2013.01); C08G 69/36 (2013.01); C08G 69/44 (2013.01); B33Y 10/00 (2014.12); B33Y 70/00 (2014.12)] 9 Claims
 
1. A process for the production of a shaped body by binder jetting, comprising:
(i) applying a powder layer on a construction platform or on a previously applied powder layer,
(ii) printing a liquid composition on defined areas of the powder layer which has been applied in step (i), the liquid composition comprising
one or more monomers for the preparation of a polyester, polyamide or polyesteramide, where at least one monomer is at least trifunctional, and
a solvent,
(iii) applying a further powder layer on the powder layer which has been subjected to the printing step (ii) and printing liquid composition on defined areas of the further powder layer, the liquid composition comprising:
one or more monomers for the preparation of a polyester, polyamide or polyesteramide, where at least one monomer is at least trifunctional, and
a solvent,
(iv) optionally applying further powder layers required for the production of the shaped body and printing a liquid composition on defined areas of each of the further powder layers, the liquid composition comprising
one or more monomers for the preparation of a polyester, polyamide or polyesteramide, where at least one monomer is at least trifunctional, and
a solvent,
(v) thermally treating the liquid composition applied by printing, thereby forming a polyester, a polyamide or a polyesteramide and obtaining a shaped body wherein the powder within the shaped body is bonded by the polyester, polyamide or polyesteramide,
wherein the solvent of step (ii), the solvent of step (iii), and the solvent of step (iv) are each selected from the group consisting of water, ethanol, isopropanol, and a mixture of at least two of these solvents.