In a negative acting photoimageable composition comprising an acid functional binder polymer having a weight average molecular weight between 5000 and 40,000, optional additional higher molecular weight binder polymer, photopolymerizable alpha , beta -ethylenically unsaturated compounds, and photoinitiator. At least a portion of the photopolymerizable compounds are isocyanate trimers having tri- alpha , beta -ethylenically unsaturated functionality.
Negative-acting photoimageable compositions comprising unsaturated isocyanate trimers