| abstract |
Photopolymerizable compositions consist of a cationically polymerizable material such as an epoxy resin or phenoplast and as a photoinitiator a monoaryl iodonium salt of the formula: <IMAGE> in which Ar denotes an optionally substituted phenyl group, R <9> and R¹ °, which can be the same or different, for methylene , Methine, oxy or imino groups, G represents a covalent bond or a methylene, monoalkylmethylene, dialkylmethylene, methine, alkylmethine or carbonyl group, such alkyl groups having 1 to 4 carbon atoms, R¹¹ is a hydrogen atom, a hydroxyl group or denotes an alkyl or alkoxy group having 1 to 4 carbon atoms, x is 1, 2 or 3 and Y <x-> denotes an x-valent anion derived from an acid capable of polymerizing the cationically polymerizable material. The compositions are useful as surface coatings and adhesives, and in the manufacture of reinforced composites and printed circuits. |