Knowledge base

Real-Time FTIR spectroscopy was used to study the effect of temperature on the kinetics of UV curing from room temperature up to 160°C. Irradiation was performed at 313 rim to simulate the emission of a XeCI excimer lamp. Various acrylates and photoinitiators were used to study the influence of the viscosity and the effect of the initiator on the p

Free radicals are essential for successful UV-cunng but they can also give UV-formulators someserious problems if they are not controlled. I will consider the present knowledge and outline themajor precautions the UV-forrnulator has to consider in the endeavour to continuously improve theperformance of UV-systems, especially to improve the in-can s

         A wide variety of analytical techniques have been used over the years to aid research and development work in the field of UV curing. Many have come and gone but today two techniques have stood the test of time and are extensively used; real-time infrared spectroscopy 1 and photo 2 (Differential

The first efficient photoinitiators of the cationic polymerization were aromatic diazonium salts withanions of low nucleophilicity 1]. However, the poor thermal stabilility of the diazonium salts limitsmainly the use as photoinitiator for cationic systems. Nevertheless, in diazomicro films and printingplates 2] diazonium salts are thermostable over

Phenyl isopropenyl ketone was terpolyme— rized with styrene and n-butyl'acrylate. Clear400 am thick layers of the terpolymer on glass plates were found to be removed by brushing-offafter deep ultraviolet (DUV) exposure for 3—5 nun at room temperature or for 1 mm at 80—115't. 1.6 pm thick polymer layers were. removed by 3 times of repeated cycles of

Water-borne UV curable formulations comply with environmental and legislation constrains forvolatile organic compounds. The photoinitiator is one of the critical components of the coatingformulations. We developed a ready-to-use oil-in-water emulsion of the oligomeric, polyfunctional ahydroxyketone photoinitiator Esacure KIP 150. The emulsion is st

Maleimides as photoinitiators of acrylate polymensation are considered. The optimisation of cure conditions reveal that H bulbs, nitrogen inerting and use of tertiary amine synergists dramatically improve the photoinitiating efficiency of maleimides.Optimisation of the chemical structure reveals that aliphatic maleimides with a methylene group atta

A new bifunctional photoinitiator is presented It reacts in combination with an hydrogen donors, in particular tertiary amines. It is suitable for pigmented systems, especially for thin layers UV curable printing inks based on dark pigments. One of its peculiarities, in comparison to the other photoinitiators, is the absence of odour developed duri