Knowledge base

Type II photoinitiator systems are used extensively in litho and flexo printing of packaging inks. These systems require a hydrogen donor to generate the curing system. Without them the radical generation necessary to bring about polymerisation is very slow and ineffective for curing inks at speed. Simple aliphatic amines are very efficient hydroge

Due to the increasing use of plastics as construction materials in automotive, electronic andtelecommunication fields, the coatability of plastics is becoming more and more important. With the development of telecom, electronic and auto industry, there is a growing demand for high performance, high efficiency and value added coatings on various pla

Low voltage (< 100 kV) EB devices are successfully used in several ink curing applications. This paper will discuss low voltage EB technology as well as various applications related to ink curing. Typical advantages of low voltage EB technology are:- Operation in air is possible; therefore no vacuum equipment is required.- Compactness, which ena

A handful of different coating systems are used in the metal coating market today:o 1 pack waterborne/solventborne acrylics and air-drying alkydso 2 pack urethanes (based on alkyds or acrylics)o pack waterborne/solventborne epoxy/amineUV curable coatings are becoming more important in this field, for a number of reasons. Like other metal coati

New quick-set 2K UV laminating systems have been developed and advantages are described. This new breed of laminating adhesives filled in the gap between traditional polyurethane systems (solvent based and solventless) and conventional UV/EB laminating adhesives. These new 2K systems not only address the VOC or slow set-up aspect of the PU systems

Electron beam curing (EBC) is foreseen as a promising technology for the fabrication of carbon fiber reinforced aeronautic and space structures. Epoxy acrylate resins and adhesives have been developed for this purpose. These new applications require high mechanical performances over a broad range of service temperature. A model was developed to pre

The inhibitory effect of oxygen on the photoinitiated polymerization of a polyurethane-acrylate resin has been completely eliminated by operating in a carbon dioxide atmosphere. The high-speed polymerization was followed in real-time by infrared spectroscopy, thus allowing conversion versus time curves to be directly recorded for curing reactions o

Dental filling composites based on dimethacrylates have been in clinical use for several decades. Byfree-radical polymerisation of the matrix monomers, a three-dimensional network is formed. Theselection of the monomers strongly influences the reactivity, viscosity and polymerisation shrinkage of the composite material, as well as the mechanical pr