Knowledge base

Purity and the possibility of making UV and EB coatings with very low levels of extractables is becoming more and more important. The influence of the photoinitiator systems and the structure of the products on the purity of the UV— coatings was studied. It was shown that very low levels of unreacted materials can be obtained. In EB, the influence

An alternative to the use of. acrylate monomer diluents ic described. The use of vinyl ethers as diluents for acrylato oligomers in the concurrent cationic/free radical polymerization is demonstrated. Both urethane acrylate and epoxyacrylate oligomers are examined. The film properties of concurrent cationic/free radical systems are compared to both

A number of studies have been carried out to investigate the photo-oxidation and photoyellowing phenomena which occur in various multifunctional acrylated systems. The complex formulations of radiation curable resins complicate our understanding of the mechanisms involved. For example, high concentrations of photoinitiators in UV curable resins wil

Pigmented coatings and filled or reinforced plastic systems are very widely used for functional and decorative purposes. The possibility to enter these fields with 1W curing technology offers many practical advantages. The proper choise of the photoinitiators combination which meets theright wavelength emissions is the key point to be fuilfilled. S

The aim of this paper is to provide some insight into the role of radiation curing in imaging. This requires an understanding of the basic concepts of imaging which are selective exposure, positive and negative systems, image and non—image areas, and developitent. These concepts will be explored together with a brief examination of the chemistry of

Urethane and epoxy acrylate resins have been the backbone of radiation and electron beam cure coatings for over twenty years. Aromatic urethane acrylates have beendeveloped that bridge the epoxy acrylate properties. Liquid color, thermal storage stability, solvent resistance, cure rate and tensile strength, elongation, and elastic modulus propertie

Electoron beam curing technique has been studied in manufacturing resin stampers for embossed holograms. Several EB curable resins were tested and evaluated from measuring diffraction efficiencies of holograms embossed with these resin stampers. Some of the present resin stampers showed excellent performance comparable to conventional metal stamper

The number and variety of applications for UV curable adhesives, coatings and inks have been increasing at a rapid pace. 'New demands on lamp systems arise from requirements for higher speeds, higher efficiency and special configurations for complex parts. The latest developments inmicrowave power lamps are discussed. The benefits of stable lamp ou