Secondary acrylamides in nyloprint® printing plate as a source of contact dermatitis

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Abstract
Several chemically pure fractions have been isolated from Nyloprint® printing plates. 5 of the fractions elicited positive patch test reactions in 7 Nylonprint® allergic printers. 4 of the 5 components were analysed by means of nuclear magnetic resonance, infrared spectrophotometry, mass spectrometry and elemental analysis. The fractions were identified as N,N′‐methylene‐bis‐acrylamide, N,N′‐[oxybis(methylene)]bis‐2‐propenamide, N,N′‐[1,2‐ethanediylbis(oxymethylene)]‐2‐propenamide, and a new compound N‐[(2‐hydroxyethoxy‐methyl]‐2‐propenamide. All of the analysed fractions have the common feature of being secondary acrylamides.