Optical macromolecular indoaniline indicators for vinyl-SiH curing of silicones for dental application

In this paper we present a poly siloxane containing covalently bound indoaniline dye, which decolorizes during reaction with a poly siloxane bearing vinyl and Si‐H groups in the presence of a Karstedt catalyst. Poly siloxane bearing indoaniline endgroups were prepared from (2‐allyl‐4‐(4‐(ethyl(2‐hydroxyethyl)amino)phenylimino)‐ 6‐methoxycyclohexa‐2,5‐dienone respectively 2‐allyl‐4‐(4‐(ethyl(2‐hydroxyethyl)amino)phenylimino)cyclohexa‐2,5‐ dienone) and Si‐H terminated poly siloxane. The structure was verified by IR‐, 1H‐NMR spectroscopy, and MALDI‐TOF mass spectrometry. The obtained blue colored poly siloxane is suitable as dye indicator for crosslinking, for example, for a time‐controlled preparation of dental impressions. Copyright © 2009 John Wiley & Sons, Ltd.