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Cationic Radiation curable silicones have been complemented by additional silicones in order to achieve special needs such as very low and stable release in front of agressive adhesives. We have developed epoxy silicone polymers with release values starting very low and increasing slightly with stripping speeds. The new system is targeted for use o
Although UV curing of acrylic pressure sensitive adhesives is known for more than 30 years, theinterest has grown rapidly in the last years 1]. The challenge to develop adhesive coatings free from organic solvents, while retaining the performance properties of solvent-based acrylic, is the major motivation in the concept of UV curing, It has been a
The ongoing environmental discussion has also touched the field of adhesives. In response to the concerns expressed, solvent-free systems are gaining increasing significance in the pressure-sensitive adhesives segment. This trend has also strongly affected radiation-curing hot-melt adhesives, evident from the large amount of literature published on
UV Curing of Styrenic Block Copolymer Based Pressure Sensitive Adhesives
Styrenic block copolymers (SBC) are widelyused in a variety of pressure sensitive adhesive(PSA) applications both in tapes and labels.The most commonly used styrenic blockcopolymers for adhesive applications are tnblockscontaining an elastomeric mid-block andtwo thermoplastic end-blocks (Figure 1). Thenature of the elastomenic mid-block can bepolyb
How To Tackle Adherence Problems With Uv Formulations?
One of the limitations of UV curing systems is the difficulty to get adherence on non poroussubstrates. The goal of this study, carried out by Cray Valley, is to understand mechanisms of adherence of UV coatings and to propose guidelines for formulations of UV varnishes on plastic substrates. It has been shown (1,2) that a good wetting is necessary
Water Transport Properties of Radiation-cured Coatings and their Effect on Adhesion
Organic polymers are, unlike ceramics or metals, permeable to a greater orlesser extent to water vapour. Thus, it is important to bear in mind how the watertransport properties will affect their performance in the environment in whichthey will operate.Use of organic polymers to protect products from degradation is widespread inindustry. In the food
Radiation Curing Of Pressure Sensitive Adhesives: An Overview
For more than four decades radiation curing of pressure sensitive adhesives has been known. Work hasbeen contributed by many companies and institutes and thus the information is scattered over a greatnumber of patents, articles in scientific and trade journals, conference papers, and reviews.Up to 1974 there is a status report prepared by R. Dowben
Adhesion Of Radiation Curable Monomers To Solid Polymer Surfaces
The main components of a UV-curable coating are mono- and polyfunctionalacrylic monomers, prepolymerized resins, pigments, extenders,inhibitors,stabilizers, and photoinitiators. Radicals can essentially be formed by twomechanisms: photofragmentation or excitation of a photosensitizer followed byhydrogen abstraction. Both mechanismshav been thorough