| 摘要 |
Dimeric bisacylphosphines. oxides and sulfides Compounds of the formula I <IMG> (I), in which Z is oxygen or sulfur, n and m are independently of one another 0 or 1, R1, R2, R3, R4 and X are as defined in claim 1, are suitable as photoinitiators for the polymerization of ethylenically unsaturated compounds.
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