Process for producing an object from a precursor and use of a free-radically crosslinkable resin in an additive manufacturing process

US10449714B2 · kind B2 · utility

Assignee

• Covestro Deutschland AG · DE

Inventors

• Dirk Achten · Leverkusen, DE
• Thomas Büsgen · Leverkusen, DE
• Jörg Tillack · Bensberg, DE
• Michael Ludewig
• Christoph Tomczyk · Leverkusen, DE
• Roland Wagner · Feldkirchen-Westerham, DE

Key dates

• Filing date: Nov 14, 2017
• Grant date: Oct 22, 2019
• Expiry date: Nov 14, 2037

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09J2475/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for producing an object from a precursor comprises the steps of: depositing a free-radically crosslinked resin atop a carrier to obtain a ply of a construction material joined to the carrier which corresponds to a first selected cross section of the precursor; depositing a free-radically crosslinked resin atop a previously applied ply of the construction material to obtain a further ply of the construction material which corresponds to a further selected cross section of the precursor and which is joined to the previously applied ply; repeating step II) until the precursor is formed; wherein the depositing of a free-radically crosslinked resin at least in step II) is effected by exposure and/or irradiation of a selected region of a free-radically crosslinkable resin corresponding to the respectively selected cross section of the object and wherein the free-radically crosslinkable resin has a viscosity (23° C., DIN EN ISO 2884-1) of ≥5 mPas to ≤100000 mPas. In the process the free-radically crosslinkable resin comprises a curable component in which NCO groups and olefinic C═C double bonds are present, wherein in the curable component the molar ratio of NCO groups to olefin…