Contact allergy to trimethylolpropane triacrylate (TMPTA) in an aziridine plastic hardener

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Abstract
4 workers developed hand and face dermatitis when exposed to a floor top coal. This contained a polyurethane arid a polyfunctional aziridine hardener and additives. The aziridine hardener was made by reacting propyleneimine with a polyfunctional acrylate, trimethylolpropane triacrylate (TMPTA). All 4 reacted to the hardener and to TMPTA, which is present in excess, 2 of them also reacted to pentacrythritol triacrylate (PETA), which can be used in the production of aziridine hardeners. TMPTA and PETA cross‐react, and are known sensitizers in UV‐hardening acrylates.The present finding shows that well‐known sensitizers can be found in hidden sources when used in a quite different chemical process.