Covestro (Netherlands) B.v.

Dsm IP Assets B.v.

Stratasys, Inc.

Johan Jansen

Tai Yeon Lee

Luke Kwisnek

Mike Scianna

Paulus Steeman

Marco Driessen

Sainath Vaidya

Radiation curable compositions for additive fabrication are described and claimed. Such compositions are particularly suited for investment casting applications, and include a cationically polymerizable component, a radically polymerizable component, a certain type of prescribed antimony-free, sulfonium salt-based cationic photoinitiator, and a free-radical photoinitiator. In other embodiments, the composition may also include a photosensitizer and/or a UV/absorber. Also described and claimed is a method for using a liquid radiation curable resin for additive fabrication with a certain type of prescribed antimony-free, sulfonium salt-based cationic photoinitiator and a certain type of prescribed photosensitizer in an investment casting process.

Antimony-free radiation curable compositions for additive fabrication, and applications thereof in investment casting processes

Liquid radiation curable compositions are disclosed which are suitable for hybrid (i.e. cationic and free-radical) polymerization when processed via additive fabrication equipment utilizing sources of actinic radiation with peak spectral intensities in the UV/vis region. Also disclosed are methods of creating three-dimensional parts via additive fabrication processes utilizing sources of actinic radiation with peak spectral intensities in the UV/vis region employing liquid radiation curable compositions suitable for hybrid polymerization, and the parts cured therefrom.

Liquid, hybrid UV/vis radiation curable resin compositions for additive fabrication

Liquid, hybrid UV/VIS radiation curable resin compositions for additive fabrication

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Echt, Netherlands

Johan Jansen