| 摘要 |
Mixtures of (A) a mercaptophenyl ketone of the formula I <IMAGE> I in which n is 1 or 2, Ar is an unsubstituted or substituted aryl radical or a hetero-aromatic radical, R1 is hydrogen, alkyl or, if n is 1, also -SCH2X and X, if n is 1, is one of the groups -CH(R2)-OH, -CH(R2)-O-CO-R5, -CH2SH or -(CH2)1-3-NR3R4, in which R2 is hydrogen, methyl, phenyl or one of the groups -CH2OH, -CH2-NR3R4 or -CH2-OR6, R3 and R4 independently of one another are hydrogen, alkyl or hydroxyalkyl, or R3 and R4 together are 1,4-butylene, 1,5-pentylene or 3-oxa-1,5-pentylene, and R5 and R6 are monovalent hydrocarbon radicals, and X, if n is 2, is alkylene, vinylene, phenylene or one of the divalent groups -CH2S-SCH2-, -CH(R2)-O-CO-O-CH(R2)-, -CH(R2)-O-CO-R7-CO- OCH(R2)-, -CO-O-R8-O-CO-, -CH2COO-R8-OOCCH2- or -CH(OH)-CH2-O-R8-O-CH2-CH(OH)-, in which R7 is a divalent hydrocarbon radical or -NH-R9-NH-and R8 and R9 are divalent hydrocarbon radicals, and (B) an organic amine are effective initiators for the photopolymerization of ethylenically unsaturated compounds or for the photochemical crosslinking of polyolefins.
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