| abstract |
Compounds of the formula I <IMAGE> in which R1 is C1-C18alkyl, cyclopentyl or cyclohexyl, and R2 and R3 are phenyl optionally substituted by halogen C1-C4alkyl and/or C1-C4alkoxy, with the proviso that R1 is not decyl if R2 and R3 are halo-substituted phenyl, are suitable for the photopolymerisation of compounds containing ethylenically unsaturated double bonds. |