| abstract |
The compounds of formula I (CF DRAWING IN BOPI) in which R1 represents a C1 -C4 alkyl, R2 represents a hydrogen, a C1 -C4 alkyl or a C1 -C4 alkoxy and R3, R4, R5, R6 and R7 represent, independently of each other, a hydrogen, a halogen, a C1 -C20 alkyl, a cyclopentyl, a cyclohexyl, a C2 -C12 alkenyl, a C2 -C18 alkyl interrupted by one or more oxygen atoms, a C1 -C4 alkyl substituted by phenyl, a phenyl which is unsubstituted or substituted with one or two C1 -C4 alkyls and / or C1 -C4 alkoxy, provided that at least one of the radicals R3, R4, R5, R6 and R7 is different from hydrogen and provided that, when R1 and R2 represent methyl, R3 and R6 are not methyl, and mixtures of such compounds with alpha-aminoketones, can be used as photoinitiators. |