Cationic UV-Curing: Technology and Applications

Abstract

This paper reviews the field of cationic UV‐curing and reports recent progress made in understanding the fundamental chemistry and in technology applications. Radiation curing technologies are expanding rapidly on an industrial scale and interest in cationic photopolymerizations has advanced rapidly. In particular, the cationic UV‐curing process presents additional benefits, including: the absence of air inhibition, a “dark‐curing” reaction, low levels of toxicity and irritation, and a lower volume shrinkage during photopolymerization. In this review, a large number of papers and patents are reviewed and critically discussed specifically with respect to the application of cationic UV‐curing technology in the field of coatings, composites, adhesives, and inks.

Photochemical Production of Interpenetrating Polymer Networks; Simultaneous Initiation of Radical and Cationic Polymerization Reactions

“…The photopolymerization of bisphenol-A-diglycidyl dimethacrylate/bisphenol-A-diglycidylether/tetrakis (methacryloxy ethoxy) silane [44,45], siloxane or silsesquioxane/α,ω-nonconjugated dienes [46] leads to organic-inorganic IPNs. It should be noted that tetrakis (methacryloxy ethoxy) silane only forms an inorganic material after hydrolysis.…”

Unique Curing Properties through Living Polymerization in Crosslinking Materials: Polyurethane Photopolymers from Vinyl Ether Building Blocks

“…[12] Unfortunately, the highly exothermic reaction leads to vigorous heat release, which hinders the use of low-molecular-weight vinyl ethers in technical applications. As a consequence, urethane-functionalized or blended vinyl ether systems were investigated.…”

Inhibition effect of N,N-diglycidyl-4-glycidyloxy aniline on photosensitized cationic polymerization of formulations involving resorcinol diglycidyl ether and poly(propylene glycol)diglycidyl ether

“…Cationic photopolymerization has tremendous importance in recent times due to its ability to undergo the reaction at ambient conditions, less toxic nature of monomers, better mechanical and physical properties as compared to monomers used for polymerization by free radical route and hence has several emerging applications [1,2]. Derivatives of diaryl iodonium or triaryl sulfonium salts are generally used as photoinitiators for cationic photopolymerization.…”