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Article | REF: AM3044 V1

UV curing

Author: Christian DECKER

Publication date: July 10, 2000

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2. Photoinitiators

To be effective, a photoinitiator must satisfy a number of criteria:

  • it must have high absorption in the emission range of the light source used, usually a mercury vapor lamp;

  • singlet and triplet excited states must have short lifetimes (a few nanoseconds) to avoid quenching by molecular oxygen or monomer;

  • ions or radicals from excited states must be produced with the highest possible quantum yield and be reactive towards the monomer group.

The various photophysical processes involved after absorption of a photon by an initiator molecule are shown schematically in figure 1 . The initiation rate is given by the relation...

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