| abstract |
Dye compounds of the formula wherein the generic symbols are as defined in claim 1 [thus, for example, X is CH, C-CH 3 or +NOR L<SP>-</SP>; R is inter alia C 1 -C 6 alkyl; R 1 is for example C 1 -C 8 alkoxy or C 1 -C 12 alkyl; s is 0 to 4; R 2 is for example hydrogen; Ar is for example a group (D), (E); Y inter alia is C 1 -C 6 alkyl or C 1 -C 6 alkoxy; r takes all values from zero to maximum ring solution; and L is an anion], optionally in combination with an electron donor compound (especially a borate compound) are suitable as photoinitiators for the photopolymerization of radically polymerizable compositions. The compounds of Formula I are claimed per se (subject to the proviso of claim 20). Compounds of formula X (X), wherein R 40 is phenyl which is unsubstituted or substituted 1-5 times by halogen, C 1 -C 4 alkoxy, C 1 -C 20 alkyl or C 1 -C 20 haloalkyl; R 41 is C 3 -C 12 cycloalkyl, which may be condensed with one or more aromatic rings; and G<SP>+</SP> is a cation are also claimed per se (subject to the provisos of claim 22). |