We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Digital Imaging of Lithographic Materials by Radical Photopolymerization and Photonic Baking with NIR Diode Lasers.
- Authors
Brömme, Thomas; Schmitz, Christian; Oprych, Dennis; Wenda, Andre; Strehmel, Veronika; Grabolle, Markus; Resch-Genger, Ute; Ernst, Steffen; Reiner, Knut; Keil, Dietmar; Lüs, Patrick; Baumann, Harald; Strehmel, Bernd
- Abstract
Photo-initiated cross-linking of multifunctional acrylic esters in polymeric binders was investigated based on digital imaging using the Computer-to-Plate (CtP) technology applying laser exposure in the near-infrared (NIR). Generation of initiating radicals occurs by electron transfer from the excited state of the NIR-sensitizer to the radical generator, an onium salt. Iodonium salts derived from several borates and those with the bis(trifluoromethylsulfonyl)imide anion resulted in lithographic materials with high sensitivity. Photo-induced electron transfer plays a major function to generate initiating radicals by a sensitized mechanism but thermal events also influence sensitivity of the coating. Internal conversion was the major deactivation pathway while a certain fraction of NIR-dye fluorescence was also available. A line shape focused laser system with emission in the NIR was successfully used to bake the materials.
- Subjects
DIGITAL image processing; COMPUTER-to-plate systems; PHOTOPOLYMERIZATION; SEMICONDUCTOR lasers; NEAR infrared radiation
- Publication
Chemical Engineering & Technology, 2016, Vol 39, Issue 1, p13
- ISSN
0930-7516
- Publication type
Article
- DOI
10.1002/ceat.201500453