Knowledge base

Urethane functionalities are often introduced into coatings for toughness. This increased toughness is attributed in part to the hydrogen bonding capacity (physical network) of the urethane group. Generally, most of the urethane acrylate raw materials are difunctional or oligomeric. To date, there are a limited number of monofunctional urethane acr

In the early 1 it was reported that heating up or photolyzing a mixture of a difunctional thiol and adifunctional ene resulted in the formation of linear polymers. This polymerization is unique in that it is a step growth type polymerization that proceeds by a free-radical chain mechanism. In the mid 1970s, in monumental work in the radiation curin

HDDA is a welt-known reactive diluent for a wide range of high viscous oligomer resins used in UVcuring technology. Due to environmental constraints, efforts have been made to develop new reactive diluents that can be used as substitutes of HDDA. In this study, a number, of diol diacrylates with varying chain lengths and different degrees of ethoxy

During the past year, a new UV Powder resin system, developed for applications on wood, was presented on several 23 The technological benefits and performance of this system on MDF (pigmented textured finish), natural wood and veneered composite board (matt / semi-gloss clearcoat) have been published in the September issue of "The European Coatings

 Interpenetrating polymer networks (IPN) can be readily synthetized by crosslinking polymerizationof two multifunctional monomers or telechelic oligomers that polymerize by different mechanisms, e.g. radical and cationic types. The main advantage of IPNs is to combine in a single material the properties of the two kinds of polymer networks. An

A blend of 4 - benzoyl biphenyl (BBP) and a maleimide (Ml) was found to be an excellent photoinitiator for curing a variety of formulations. It was found that a combination of the BBP I Ml blend and an oligomeric amine synergist resulted in a very efficient photoinitiating system. It was found that for some formulations, cure speeds obtained using

In recent years photo-polymerization has attracted much attention because of its increasing technical importance in, various. Much effort has been devoted to free radical photoinitiatedpolymerization, mainly due to the availability of a wide range of photoinitiators. For specificapplications this key component has often to be adapted. The spectral

In radiation curing, typical reactive sites accessible to conversion are acrylate double bonds, vinyl groups oroxirane moieties. In a photoinitiated polymerisation reaction the reactive sites are consumed during chaininitiation and propagation until all reactive sites have been reacted, or more realistically, until conversion hasstopped. In the lat