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1 American Dental Association Health Foundation Research Unit, National Bureau of Standards, Washington, DC 20234, USA
Yellow mixtures form on adding essentially colorless N,N-dimethyl-p-toluidine (DMPT) to colorless methacrylate monomers containing phthalate, isophthalate, or terephthalate diester groups. The color-causing interactions between the amines and monomers were investigated using ultraviolet spectroscopy. Equations were derived for predicting interactions between formulation ingredients and DMPT that would lead to undesired color.
Submitted on April 8, 1974
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