Novel Synthetic Pathways for Bis(acyl)phosphine Oxide Photoinitiators

摘要

For more than 30 years, photoinitiated polymerization has been widely used in industry for several applications, ranging from coatings, adhesives, inks, optical waveguides, microelectronics.More recently, the development of high-tech materials, such as laser videodiscs, curing of acrylate dental fillings, and the manufacture of 3D objects has been possible also thanks to the discoveries of novel photoinitiators endowed with tailored properties, such as fast polymerization rates, high activity at room or lower temperatures, biological compatibility, and the possibility to use solar light instead of UV light to produce radicals in high quantum yields. This last issue is important for application on humans (dentistry, bone replacement), where UV light is known to cause damage to healthy tissues. Of particular interest for industrial applications is also the possibility to use radiation curing of clear coatings, for example where a high degree of whiteness is required. One of the issues that needed to be solved is the shelf-life of these lacquering agents as no yellowing of the cured film is tolerated especially in the finished article and after prolonged exposure to solar light. above-mentioned reauirements is reoresented bv monoacvl-