Use of core-shell(-shell) particles in the binder jetting process

The invention relates to the 3D printing technical field, in particular to the 3D printing technical field in the binder jetting process. A three-dimensional object is formed by 3D printing, especially by a binder jetting method, in which particulate material in a powder bed is bonded by a printed adhesive. The particulate materials may be inorganic materials, for example sand or a metal powder, or particulate polymeric materials, for example polymethacrylates or polyamides. For this purpose, polymethacrylates may take the form, for example, of suspension polymers, called bead polymers. Powder bed compositions comprising core-(shell)-shell particles can be used for 3D printing, wherein the core-(shell)-shell particles can swell in contact with the binder during the printing operation. 本发明涉及3D打印技术领域，尤其是粘结剂喷射方法形式的3D打印技术领域，其中借助于打印的粘合剂使在粉末床中的颗粒状材料结合以形成三维物体。所述颗粒状材料可以是无机材料，例如砂或金属粉末，或者颗粒状聚合物材料，例如聚甲基丙烯酸酯或聚酰胺。为此目的，聚甲基丙烯酸酯可以采取例如被称为珠状聚合物的悬浮聚合物的形式。本发明更特别地涉及用于3D打印的包含核-(壳-)壳粒子的粉末床组合物，其与现有技术的区别在于在所述打印操作过程中，与所述粘结剂接触时，所述核-(壳-