Knowledge base

A new a-cleavage photoinitiator is presented. This initiator is especially useful in pigmented systems and in various applications of the imaging area due to its absorption characteristics in the range between 350 and 400 nni. Application results demonstrating its outstanding performance are presented. Photodecoinpositionpathways are discussed base

Details of newly developed photo-patternable solder masks based on polyether resins with photo-crosslinkable side groups are reported. The synthesis of the basic photopolymers follows a chlorine-free route by addition of olefinically unsaturated isocyanates to the secondary hydroxy groups of a polyether with bisphenol-A partial structures. The phot

The use of UV and EB technology for curing coatings and inks has been commercial in the US for about 20 years now and has grown steadily, although slower than anticipated, during that time. However, radiation cured coatings, inks and adhesives still make up a very small (<10%) portion of the overall picture. Foreign acquisition of and by US comp

More severe environmental protection requirements having given way to stronger governmental restrictions for limiting the emission of noxious substances into the atmosphere (Technical Instructions! TI Air), determine the permissible limits for mass flows and concentrationsof potential noxious substances in the waste gases of industrial lacquer coat

The difficulties encountered when attempting to obtain adhesion of radiation curable coatings to metal are well known. The effects of pigments on the extent and rate of cure in EB curable systems are less well documented, although it is qualitatively understood that they affect the reactions involved. This paper describes how FT-JR spectroscopy has

In developing formulations, there are many options available in terms of which grade of product or which supplier's product will best meet the final properties sought. One of the common additives used in UV formulations is a thickening agent. It is added to adjust final viscosity or rheology to achieve optimum application characteristics. Although

Curing and imaging processes, based on photogeneration of acid, have not as yet achieved the commercial significance of corresponding free radical processes. Several reasons for this may be advanced including the development of photoinitiators for cationic polymerization was precededby substantial advances in curing and polymer imaging technology b

Epoxy—functionalized polydimethylsiloxanes have been developed which, when combined with silicone—miscible iodonium photocatalysts, then coated onto releaseliners, function as ultraviolet—light—curable release agents for pressure—sensitive adhesives. The new UV cure silicone system has proven particularlyuseful for premium release applications vers