New copolymerizable photoinitiators for radiation curing of acrylic PSA

This article presents a new class of copolymerizable photoinitiators containing vinyloxycarbonyl groups, known such as organic carbonate or carbamate. Novel copolymerizable photoinitiators have been prepared through the reaction between vinyl chloroformiate and hydroxyl groups containing photoreactive derivatives such as benzophenone-, acetophenone-, benzoine- and antraquinone-derivatives. The main emphasis is given to the influence of this new class of copolymerizable photoinitiators on photocrosslinking process of acrylic pressure-sensitive adhesives (PSA). Moreover, the paper describes the influence of various factors such as crosslinking time and concentration of copolymerizable photoinitiators on relevant PSA properties like tack, adhesion and cohesion.