Photosensitizers and polymerizable compositions with mannich bases and iodonium salts

A photopolymerizable composition comprising a photosensitizationally effective amount of Mannich base photosensitizer compounds of the formulae:

• ##STR16## where a=1, 2, n=1, 2, 3, 4, x=1, 2, y and z chosen such that x+y+z=3 R.sup.1, R.sup.2, R.sup.3 and R.sup.4 may be hydrogen, alkyl, aryl, aralkyl, or alkaryl, R.sup.5 and R.sup.6 are either independently substituted or unsubstituted alkyl, aryl, alkaryl or aralkyl groups, optionally containing up to 10 heteroatoms, or R.sup.5 and R.sup.6 together are selected from the group consisting of carbocyclic and heterocyclic groups, and Ar is an unsubstituted or substituted aromatic or heteroaromatic organic group ##STR17## where a, R.sup.1, R.sup.2, R.sup.3, R.sup.4 and Ar are as defined above and b=0 or 1, R.sup.7 and R.sup.9 are either independently alkyl, aryl, alkaryl, aralkyl groups, or, R.sup.7 and R.sup.9 together with R.sup.8 together with the nitrogens to which R.sup.8 is attached forms a divalent organic group selected from the group consisting of heterocyclic groups and bis-heterocyclic groups, or R.sup.8 is a chemical bond ##STR18## where a, R.sup.1, R.sup.2, R.sup.3, R.sup.4 and Ar are as defined above and where q=1, 2 or 3, with the proviso that p+q=3, and
• R.sup.10 is selected from the group consisting of alkyl, aryl, aralkyl, and alkaryl
• said Mannich base photosensitizer being in physical association with a photosensitive free radical diaryliodonium photoinitiator and at least one vinyl monomer.