Two-phase 3D printing method

US11384168B2 · kind B2 · utility

Assignee

• Covestro Deutschland AG · DE

Inventors

• Dirk Achten · Leverkusen, DE
• Thomas Buesgen · Leverkusen, DE
• Roland Wagner · Feldkirchen-Westerham, DE
• Florian Stempfle · Cologne, DE
• Christoph Tomczyk · Leverkusen, DE

Key dates

• Filing date: Dec 12, 2018
• Grant date: Jul 12, 2022
• Expiry date: May 14, 2039

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B33Y40/20
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

An additive manufacturing method wherein the carrier (400) is within a vessel (100), the vessel contains the free-radically crosslinkable resin (300) and a liquid (200) which is immiscible with the free-radically cross-linkable resin (300) and has a higher density than the free-radically crosslinkable resin (300), such that the free-radically crosslinkable resin (300) floats on top of the liquid (200) and, prior to each step II), the distance between the carrier (400) and the free-radically crosslinkable resin (300) is altered such that a layer of the free-radically crosslinkable resin forms above the uppermost surface (420), viewed in vertical direction, of the previously deposited layer of the construction material (600) and at least partially forms contact with this uppermost surface (420) of the previously deposited layer of the construction material (600). The free-radically crosslinkable resin (300) comprises a urethane (meth)acrylate. The invention further relates to the use of a free-radically crosslinkable resin comprising a urethane (meth)acrylate as construction material in a two-phase 3D printing method.