Radiation-curable coating composition, method of coating a substrate and coated substrate

The invention relates to a radiation-curable coating composition comprising a 5-hydroxy or 5-alkoxy-2(5H)-furanone compound A, a compound B with two or more vinyl ether or vinyl ester groups, wherein the molar ratio of vinyl moieties in compound B and furanone moieties in compound A is at least 0.5, and wherein the coating composition is free of a compound with two or more acryloyl or methacryloyl groups. The invention further relates to a method of coating a substrate comprising applying such coating composition to a substrate and radiation-curing the coating composition to form a cured coating, and to a coated substrate obtainable by such method

A coating from nature

For almost a century, petrochemical-based monomers like acrylates have been widely used as the basis for coatings, resins, and paints. The development of sustainable alternatives, integrating the principles of green chemistry in starting material, synthesis process, and product function, offers tremendous challenges for science and society. Here, we report on alkoxybutenolides as a bio-based alternative for acrylates and the formation of high-performance coatings. Starting from biomass-derived furfural and an environmentally benign photochemical conversion using visible light and oxygen in a flow reactor provides the alkoxybutenolide monomers. This is followed by radical (co) polymerization, which results in coatings with tunable properties for applications on distinct surfaces like glass or plastic. The performance is comparable to current petrochemical-derived industrial coatings