Knowledge base

1. IntroductionThe development of resins for Stereolithography (SL)needs its own formulation strategy, although some of thecomponents may be identical to those in resists or coatings. In addition to the requirements arising from anintended application of the SL part, the process of 3dimensional laserpolymerization itself imposes stringentrequiremen

1. IntroductionThe printing industry produces a wide range of items such as newspapers,catalogues, brochures, books, etc. An important and specialised branch of theindustry is the production of business forms; in Western Europe in 1987 some1,5 million tonnes of paper were converted to forms (ref. 1).The advent of computers in the 1950's gave a trem

INTRODUCTIONThe increased crosslink density attained when using divinylether reactive diluents in UV curable unsaturated polyester based.coatings can provide improvements in hardness, mar resistance andother properties. (ref. 1) Simply replacing styrene withtriethylene glycol divinyl ether (TEGDVE) in these formulationshowever can lead to problems

INTRODUCTION There is a widespread perception that paper. products printed withradiation cured inks and coatings cannot be recycled as compared to conventionallycured (thermal) systems. From the raw material suppliers to the scrap paper brokers,the Consensus is that landfill or incineration are the only way to deal with suchwaste. There are, of cou

INTRODUCTIONIn the process of UV-curing, the characteristics of the light source have longbeen a neglected factor. Adaptations of the formulation' (in particular, thephotoinitiator) have been the.action of choice whenever cure problems wereapparent, whereas the light source has remained relatively unaffected.In recent years, pigmented UV-fromulatio

IntroductionToday modern composite resisns consisting of monomers, fillers andadditives are widely used in denistry (2 , 5 - 9). This new catego—ry of materials allows it to restore by carious destroyed hard toothtissues with very satisfactory esthetic results.The modern composite materials for tooth fillings have become veryimportant for restorati

IntroductionThere are two distinct cross-sectional regions toconsider when irradiating an acrylate functional coating withUV. energy: the thin layer;of coating at the'air-coatinginterface, commonly called the surface; and all the remainingdepth of the coating. In order to obtain a commerciallyacceptable level of overall cure, both the surface and b

1. IntroductionTriarylsulfonium salts have found prominence in the electronics industry for photoinitiatedacid catalyzed reactions of polymers and oligomers. There have also been uses forsulfonium salts in polymer films for photo-doping and photo-optical applications. Thiswide range of uses for triarylsulfonium salts has prompted interest into mech