| abstract |
The invention relates to the discovery that a combination of iron dodecacarbonyl and a co-catalyst selected from the group consisting of alpha-bromoisobutyrophenone, cumene, diisopropylbenzene, carbon tetrachloride, alkyl mercaptans containing from 10 to 16 carbon atoms, thiourea, organic peroxides, and mixtures thereof, and a combination of iron dodecacarbonyl, alpha-bromoacetophenone, and an organic peroxide are each capable of photosensitizing the polymerization of ethylenically unsaturated compounds with visible light in the range of 4,000 to 7,000 angstroms. |