Evonik Degussa Gmbh

Evonik Operations Gmbh

Stefan Altkemper

Maik Grebe

Sylvia Monsheimer

Franz-Erich Baumann

Ulrich Simon

Wolfgang Diekmann

Sigrid Hessel-Geldmann

Kristiane Warnke

Heike Stemmer

Wolfgang Christoph

Olivier Farges

Mario Resing

Joachim Muegge

Michael Tuerke

Composite particles comprising core particles completely or partially coated with a precipitated polymer, where the dmedian diameter of the core particles is from 3 to 100 &#x3bc;m and wherein the glass core particle material is at least one selected from the group consisting of a solid glass bead, a hollow glass bead, a porous glass bead, and a foamed glass particle. A method to prepare the particles includes dissolution of a polymer in a solvent and precipitation of the polymer in the presence of a suspension of the core glass particles. Further provided is a layer by layer moulding process employing the composite particles and mouldings obtained therefrom.

Powder comprising polymer-coated glass particles

A process for the layer-by-layer production of three-dimensional objects, through selective melting and solidification of pulverulent substrates is provided. According to the process the construction chamber is inertized with an inertizing gas which is of higher density than air. An apparatus for conducting the process is also provided.

Process for the production of a three dimensional system

A task often encountered in very recent times is the rapid provision of prototypes. Particularly suitable processes are those based on pulverulent materials and in which the desired structures are produced layer-by-layer through selective melting and solidification. The invention provides the constitution, production and use of a copolyamide powder which was produced using the following monomer units: a) laurolactam or &#x3c9;-aminoundecanoic acid, and also b) dodecanedioic acid, and either c) decanediamine or dodecanediamine, in shaping processes, and also to moldings produced through a layer-by-layer process which selectively melts regions of a powder layer, using this specific powder. Once the regions previously melted layer-by-layer have been cooled and solidified, the molding can be removed from the powder bed. The moldless layer-by-layer processes for the production of components using the copolyamide powder result in simplified and more reliable conduct of the process and better recyclability.

Copolyamide powder and its preparation, use of copolyamide powder in a shaping process and mouldings produced from this copolyamide powder

A powder which is capable of being used in a layer-by-layer process in which regions of the respective pulverulent layer are selectively melted and, after cooling, are fixed, contains a mixture of diacid-regulated polyamide and diamine-regulated polyamide and/or diacid-regulated copolyamide and diamine-regulated copolyamide.

Powder with improved recycling properties, process for its production, and use of the powder in a process for producing three-dimensional objects

The present invention relates to a composite powder of polymer powder and porous glass beads, and to the use of this composite powder for shaping processes, and also to mouldings produced from this composite powder.

Composite powder, use in a shaping process, and mouldings produced from this powder

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Dorsten, Germany

Stefan Altkemper