Knowledge base

The monitoring of polymerization reactions is of increasing relevance in the production of polymeric materials. It allows for a better control of the actual state of the process which may lead to a more efficient use of energy, raw materials, and reactor time as well as to a higher and more consistent quality of the production output.

Photoinitiators for visible light curing of photopolymerizable formulations are still a challange due to the high demands in modern applications such as dental filling materials, reprography (photoresists, printing plates, integrated circuits) lasre induced 3D curing, holophorquinone and ethyl nano-scale micromechanics.

The present work addresses a strong market demand for antireflection (AR) coatings. AR coatings consist of at least one thin film with a high refraction index.

In cationic photopolymerization, the photoinitiator (PI) plays a key role in UV-curable systems by generating the reactive spiecies, a free acid, wich initiates the polymerization. In the past decades a large set of substances capable of photo-acis-generation have been tested as Pls, especially different onium-salts have been of prime interest.

This paper revieuws the developmentof new additives, in particular photoinitiators, designed to drastically reduce emissions from coatings after curing. Low odor and low migration are two key characteristics that will help to ensure higher market penetration in sensitive applications such as printing and packaging.

More invironmential protection requirements force users of solvent-based coatings to look for an environmentally safe procedure that emits considerably less solvents or cracked products into the atmosphere and water.

The requirements to scratch-resistant surfaces soared in the years. There are numerous of examples for it, like industrial coatings, automatives clearcoats and formable coatings for oil coating or fiol applications.

In UV-curable systems the photoinitiator (PI) generates the reactive species, free radicals or ions and subsequently initiates the polymerization of diverse multifunvtional monomers, oligomers or prepolymers.