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S. Schörpf, R. Taschner, P. Gauss, P. Knaack, R. Liska:
"Replacing Aromatic Type II Photoinitiators with α-Ketoesters for Radical Polymerization";
Poster: RadTech USA 2019, Monterey - CA, USA; 15.09.2019 - 18.09.2019.

Photopolymerization presents a versatile method in various application and is well known as a high efficient fast curing processes in industry. A wide range of industrial products, from coatings to the most complex applications, such as 3D printing of biomaterials are based on this useful method. Most of the industrial radical photoinitiators are based on aromatic ketons where the benzoyl-chromophore is responsible for the light absorption. In sensitive applications such as the food packaging or the medical sector, residual photoinitiaor or photoproducts has to be avoided to prevent the products form contamination. Mainly low molecular weight photoinitiator or sensitizers can be dangerous and are able to harm the human body.
In the range of 230-350 nm benzophenone derivatives are one of the most common photoinitiaros for UV curing. Because of their cost efficiency and their good performance, they are of big interest for industrial usage. Generally, benzoyl chromophores generate various aromatic recombination products during the curing process. The side products of the aromatic initiators can be potentially mutagenic or toxic and therefore even nontoxic initiators can lead to dangerous migrating substances in the final product.1 Since the International Agency for Research on Cancer (IARC) has classified benzophenones as carcinogen, the focus of research goes towards non-aromatic compounds.2-3

Photopolymerization, coatings, 3D printing of biomaterials, industrial radical photoinitiators, benzophenone derivatives