Powder-based additive manufacturing process at low temperatures

US10926459B2 · kind B2 · utility

Assignee

• Covestro Deutschland AG · DE

Inventors

• Dirk Achten · Leverkusen, DE
• Thomas Büsgen · Leverkusen, DE
• Dirk Dijkstra · Odenthal, DE
• Nicolas Degiorgio · Krefeld, DE
• Wolfgang Arndt · Dormagen, DE
• Levent Akbas · Witten, DE
• Roland Wagner · Feldkirchen-Westerham, DE
• Peter Reichert · Thousand Oaks, US
• Jörg Büchner · Bensberg, DE

Key dates

• Filing date: Sep 11, 2017
• Grant date: Feb 23, 2021
• Expiry date: May 17, 2038

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29K2995/007
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A process for manufacturing an article comprises the steps of: applying a layer that consists of particles to a target area; allowing, in a chamber, energy to act on a selected portion of the layer, according to a cross-section of the article, so that the particles in the selected portion are bonded, and repeating the steps of applying and allowing energy to act for a plurality of layers so that the bonded portions of the adjacent layers are bonded to form the article, at least part of the particles comprising a fusible polymer. The fusible polymer has a fusion range (DSC, differential scanning calorimetry; 2nd heating at a heating rate of 5 K/min.) of ≥20° C. to ≤100° C. The fusible polymer further has a complex viscosity \η*\ (determined by viscosity measurement in the melt using a plate-plate oscillating viscometer according to ISO 6721-10 at 100° C. and a shear rate of 1/s) of ≥10 Pas to ≤1000000 Pas. Finally, the temperature inside the chamber is ≤50° C. The invention also relates to an article manufactured by the process according to the invention, to an article having a substrate and to an article bonded to the substrate, the article being in the form of an adhesive joint or…