| abstract |
Photoimaging compositions comprising (a) substituted dibromoethane as defined, e.g., 1,2-dibromotetrachloroethane, 1,2-dibromo-1,1-dichloroethane, etc. and (b) leuco dye. Photoimaging photopolymerizable compositions consist essentially of (a) substituted 1,2-dibromoethane as defined, (b) leuco dye, (c) at least one ethylenically unsaturated compound, (d) photoinitiator taken from the group consisting of -4-trichloromethyl-4-methyl-2,5-cyclohexadienones, benzophenones, alkylaryl ketones, and mixtures thereof; and optionally (e) at least one organic polymeric binder. The compositions are useful to provide a printout image and in admixture with a variety of initiators or initiator systems and ethylenically unsaturated compounds provide photopolymerizable compositions having good printout images. |