We developed additives Diprenyl glycerin ether (DPNG) and Isoprenyl methacrylate (IPEMA) for reducing oxygen inhibition, which means poor curing during UV curing by oxygen. Compared with existing compounds, DPNG shows higher oxygen absorption without a metal catalyst. IPEMA is an asymmetric bifunctional monomer with a highly copolymerizable methacryloyl group and a less reactive isoprenyl group with an acryloyl group. Real-time analysis confirmed that the UV curing solution with DPNG or IPEMA rapidly accelerated the curing. DPNG exhibited antioxidant properties; moreover, its yellowing inhibition effect was more enhanced than that of contemporary antioxidants such as phenolic and hindered amine antioxidants, and it had a synergistic effect when used in combination with existing antioxidants. IPEMA can modify the cured film when used as a reactive diluent, resulting in a cured film that is hard as well as flexible. If you would like to try such an additive with unique performance for UV curing systems, please contact us.
The range of applications of UV printing is expanding with the evolution of its machines and materials. To maintain and control the quality of printed matter, it is necessary to appropriately control factors such as temperature, humidity, paper, rollers, and dampening water. In this paper, we identify the particular challenges in UV printing and show how to overcome them.
Radiation curable inks and coating have supported the growth of printing industry since the 1970s. Initially, the technology aimed to improve productivity to ensure instant curing; however, the trend is now shifting to support sustainable packaging innovation. This shift is attributed largely to the “global plastic pollution problem”; therefore, stakeholders in supply chain of flexible packaging are focusing on achieving global visions such as SDGs and COP. Thus, electron beam curable products have been proposed because photoinitiator is not an essential raw material in them, and their formulation is more flexible than that of UV or LED-UV curable products. Herein, we review the history of radiation curable product development, an overview of EB technology, and recent trends in the flexible packaging segment.