Additive fabrication process with a structural material comprising an IR absorber

US10974498B2 · kind B2 · utility

Assignee

• Covestro Deutschland AG · DE

Inventors

• Dirk Achten · Leverkusen, DE
• Thomas Büsgen · Leverkusen, DE
• Rolf Wehrmann · Krefeld, DE
• Helmut-Werner Heuer · Krefeld, DE

Key dates

• Filing date: Dec 22, 2017
• Grant date: Apr 13, 2021
• Expiry date: Feb 28, 2038

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29K2105/0067
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A process for manufacturing an article, comprising the step of manufacturing the article via an additive fabrication process from a structural material, is notable in that the structural material comprises a polymer selected from the following group: (co)polycarbonates, polyesters, polyestercarbonates, polyformals, polyamides, polyethers, polyvinyl chloride, polymethyl (meth)acrylate, polystyrene or a combination of at least two thereof and an additive absorbing infrared radiation. The additive absorbing infrared radiation is selected for its chemical structure and its concentration in the structural material such that it reduces transmission by the structural material of light in the wavelength range between 600 nm and 1700 nm, determined on a sample 100 μm thick, by ≥2.5 percentage points relative to a structural material sample with a thickness of 100 μm that does not contain the additive absorbing infrared radiation. During the additive fabrication process the structural material is exposed at least temporarily to infrared radiation in the wavelength range between 600 nm and 1700 nm. An article obtainable by a process as described above is notable for its production from a stru…