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This knowledge base contains all articles and proceedings ever presented at RTE conferences and seminars. You may search through the database using the filters below. Articles are free of charge for our members (after login).
Water-Based UV Inkjet - Novel Chemistry Approach for Food Packaging Applications
UV inkjet made tremendous progress in productivity and print quality in recent years. Market penetration in graphic arts picks up speed making traditional UV offset and UV flexo face increased competition from UV inkjet, particularly in label and packaging printing. Difficulties realising food contact compliance are a major concern limiting the gro
New EB curable CI-Flexo Ink Technology providing sustainable printing solutions for packaging applications
New EB CI-flexo ink technology has been developed to permit wet trapping without interstation hot air drying. This ink technology uses electron beam initiated free radical polymerization to achieve cure, and wet trapping is obtained by organo-jellification mechanism using Hansen Solubility Parameters (HSP). This patented new printing process was de
FORMATION OF 3D STRUCTURES IN OFFSET PRINTING TECHNIQUES BY UV INDUCED FOAMING OF INKS
The present work addresses the formation of 3D structures via UV assisted foaming of commercially available acrylic offset inks. The microcellular foaming relies on the excitation of selected photoacid generators with UV light to release Brønsted acids. Once formed, the acids react with calcium carbonate particles under the release of carbon dioxid
Highly Efficient Cleavable Photoinitiators for Visible Light Curing of Aqueous Formulations
Curing water-based formulations with photoinitiators is a state of the art technique. However, the commercially available Norrish type II water-compatible photoinitiators disappeared from the market since the bimolecularity and the resulting solvent cage in a water-based solution lead to a loss in reactivity. Since a few decades there is only one c
Toughening of Methacrylate Networks through Addition-Fragmentation Chain Transfer
In the broad field of photopolymers three dimensional networks are formed by free-radical polymerization. These networks have to fulfill a variety of requirements including high reactivity of the monomers and good mechanical properties. During polymerization an inhomogeneous network forms, that decreases the mechanical properties of the polymer and
Basic Investigation of Addition Fragmentation Chain Transfer Agents in Photopolymerization of Methacrylic Monomers
Addition fragmentation chain transfer agents (CTAs) are an upcoming important group of compounds used for controlling radical polymerization.1 Generally, AFCT reagents are known from thermal radical polymerization in solution, photoinitiated, controlled bulk polymerization is rarely found in literature. Transforming an uncontrolled radical chain re
Photopolymerization of methyl methacrylate - toward high molecular weights for high speed thermoplastics manufacturing
Photopolymerization traditionally involves the use of multifunctional monomers and oligomers thus leading the formation of tridimensional networks. Use of nonfunctional monomers opens the way to the formation of linear photopolymer chains presenting recyclable possibilities. Thermoplastics are generally synthetized by thermal way at high temperatur
Tailoring primary processes for high performance photoinitiating systems usable under visible light
Optimization of holography recording in photopolymers was studied from the point of view of the photogeneration of radicals. On the basis of a dye/borate salt photoinitiating system, the effect of the primary events and their relative efficiency was investigated with respect to the final overall properties, such as the diffraction efficiency. Quenc