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Water borne systems find a still increasing number of applications such as homogenous and micellar photopolymerization, photografting, surface coating, image , because of their ecologically safe design. A great variety of photoinitiators (Pis) have already been described to be efficient in such systems. Traditional oil soluble photoinitiators have been successfully used although more specific and encouraging results are claimed with the introduction of true water soluble photoinitiators. Because of the wide varying activity depending on the system used individual initiators must be made or "tuned" to suit a particular system. Recently we have reported the synthesis and properties of various 3 and non-ionic carbohydrate modified 5 in different emulsion and water thinable resins. These water soluble initiators are easy to incorporate and show better compatibility and activity compared to oil soluble initiators depending on the system used. The carbohydrate modified PIs based on renewable materials such as glucose, cellobiose and glucamine, may find application for example in the food packing industry because of their non-toxic residues, good migration stability and low steam volatility because of their high molecular weight. For further improvement of the migration properties the HO-functionality of the carbohydrate residue can be easily estenfied with methacryloyl chloride. This paper presents the influence of the various substitution degrees and distribution of the copolymerisable units at different glucose and cellobiose modified Type I and Type II initiators on compatibility, photoactivity and performance properties such as migration stability in commercially available emulsion and water thinable resins.
