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 The direct initiation of polymerization and crosslinking of acrylates by high-energy photons  is called photoinitiator free UV-curing. The acrylate molecule itself forms the "chromophor" needed for the radical formation. Patent pending.

Benefits of photoinitiator-free UV curing:

1. Highest output from direct excitation of the acrylate double bond :

  • Improvement of chemical and temperature resistance
  • Better mechanical properties
  • Better light and weathering stabilitiy.
  • Crosslinking of fixed systems (UV water-based coatings) and post-crosslinking of polymers with residual double bonds efficient possible
  • Crosslinking density higher than with EBH (Electron Beam Hardening)
  • no negative influence to the substrate as EB on Paper, PVC, etc

2.  No or very low (<0.5%) concentrations of photoinitiators required, resulting in:

  • Significant reduction of migration and VOC (Volatile Organic Compounds) emission
  • No "UV odor"
  • Limit values for migration from food packaging can be adhered to.
  • Migration and VOC emission similar to EBH at doses of 30 to 40 kGy.

3. Oxygen sensitivity of UV curing greatly reduced :

  • Operation of UV systems up to 1000 ppm residual oxygen possible.
  • Nitrogen production through PSA (Pressure Swing Adsorption) as an alternative to vaporization possible.


  • Food packaging
  • Furniture
  • Floor
  • Automotive

DirectCure compared to the Electron Beam Hardening (EBH): Extractable acrylates from offset printing


Time is running out: the EU Regulation of 10/2011 calls for a specific migration limit (SML) of <10μg/kg (10 ppb) for food packaging starting at 1 January 2016. This limit is well below what we have using our method.

An upgrading of existing installations is possible. Contact us - we will find the right solution for your application.


IOT GmbH filed a patent for the process of the photoinitiator-free UV curing.


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