Knowledge base

  UV curable coatings are one of the fastest growing sectors in the coatings industry. In recent years,UV technology has made inroads into a number of market segments like fiber optics, optical and pressure sensitive adhesives, automotive applications like UV cured topcoats, and UV curable powder coatings. The driving force of this develo

We present here the results about a new synthesis of gradient structure materials involving a photopolymerization reaction. A previous work 1] showed the feasibility of this method which, unlike most of the existing methods encountered in literature, proceeds with a homogeneous system, that is to say a mixture of monomers and oligomers. Thanks to t

Within a constantly and rapidly developing technology, radiation curing systems involving ultra-violet (UV) or electron beam (EB) curing are finding increasing applications in the fields of printing inks and coatings. The main advantages of these 100% solid systems are energy savings, no or very low volatile organic compound (VOC) production, very

The exterior durability of waterbased UV-cured polyurethane-acrylate (PUA) coatings has been tested in an accelerated QUV-weatherometer. Infrared spectroscopy was used to monitor the chemical changes occurring upon photoageing. The UV-curing reaction was hardly affected by the addition of the HALS radical scavengers and UV absorbers needed to impro

Bis-maleimides with different substituents were synthesized and the photo-curability was studied using the monitoring conversion, gel fraction and real-time DRA. The monitoring of conversion was tried using UV absorption spectra instead of IR or Raman spectroscopy and the conversion of bis-maleimides could be followed successfully. The non-substitu

Crosslinking systems based on N-alkyl/aryl maleimide (Ml) and vinyl ether (VE) show very interesting properties These systems are very fast, are able to cure without any photoinitiator under UV light and show very low oxygen inhibition effect. Moreover, using vinyl ether appears as an environment friendly alternative to the acrylic monomers which s

The polymerisation of coatings and printing inks using ultraviolet light (UV) or electron beam energy sources (EB) is constantly challenged to improve performances, to increase durability, to reduce costs and to satisfy environmental and safety regulations. In particular, UV curing had success in several applications as clear top coating, for the p

UV flexo printing in the narrow web field has taken hold for many years, especially in label printing.In wide web flexo printing UV is increasingly used on in-line presses, e. g. for liquid packaging and for the printing of aluminium foil. There are also UV installations on CI flexo presses whether for cardboard or for foils. Another application on