UV Inks polymerisation reaction

Posted: September 27, 2012 in UV Curing, UV Drying
Tags: , , , ,

The polymerisation reaction can be via a radical or cationic mechanism; the radical process is the most current and is based on acrylates chemistry. UV inks and varnishes contain a blend of monomers and oligomers, and photo initiators.

With the radical mechanism, photo initiators are fragmented by UV rays and form free radicals during a phase called initiation. These free radicals then react with the double bonds present on the acrylate functionalities of the oligomers and monomers; this second stage is known as the propagation phase. The termination of this chain reaction produces the hardening of the film in 3 dimensions.

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