1. What is free radical polymerization?

Free radical polymerization is a widely used method for creating polymers from vinyl monomers. free radical polymerization proceeds through a chain reaction mechanism consisting of initiation, propagation, chain transfer, and termination as the elementary steps.  Azo compounds and peroxides are the main commercially used initiators used in free radial polymerization processes.

1-1. Reaction mechanism of free radical polymerization (elementary reactions)

The first reaction, or initiation reaction generates highly active free radicals that react with monomers to generate propagating radicals. Next, in the propagation reaction, these propagating radicals continue to react with the available monomers resulting in the efficient formation of polymers. The termination reaction occurs when the propagating radical polymer undergoes recombination or disproportionation. Chain-transfer reactions occur when the propagating radical reacts with another chemicals species in the system.

It is recently reported that the radical reaction is used for the organic synthesis as a useful method of bond formation.
We have developed various azoic radical initiators, and we apply the process development for the organic synthesis with those unique initiators. We perform the effective and stereoselective reactions by selecting the radical initiators suitable for the reaction condition and/or reaction system of the compound requested from customers.

Photo base generator (PBG) generates anion (base) upon irradiation of light in the UV range. The technology of anionic UV curing using the base generated from PBG is expected to apply to various applications such as coating, ink, dental material, photoresist, etc. In addition to the originally developed PBGs, we have many variations of PBG co-developed with Arimitsu, an associate professor at Tokyo University of Science, in our lineup.