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Decomposition o f cationic photoinitiators in the solid state is used in a remote cure process ie. one in which photoinitiator is not present in the polymerisable monomer. An application of this process to a dual cure system is described. Details are given of free radical polymerisation reactions in aqueous solutions which produce latexes via both suspension and emulsion polymerisation processes. Finally, ways of improving the photosensitivity of poly(viny1 alcohol) modified with styrylpyridinium groups utilising mixed [2+2]cycloaddition reactions are described.

The curing of coatings using radiation techniques rather than the traditional thermal method is becoming increasingly important in industry. In this article, the authors explain the processes used and the reasons for the rising significance of radcure technology.