Abstract
This paper documents recent progress in the development of efficient onium salt PAGs and discusses their implementation in a number of imaging and non-imaging applications. Discussed herein is the synthesis of novel onium salt PAGs and their tailored modification to achieve good solubility and thermal stability. Two methods for spectral broadening to achieve long wavelength UV and visible light sensitivity by electron-transfer photosensitization and free radical promoted sensitivity are described. The development of cationically polymerizable epoxy, oxetane and vinyl ether monomers is discussed. Lastly, the use of optical pyrometry as a new method for the monitoring of the photoresponse of various PAGs and the reactivity of photopolymer is described.
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