Acrylated tackifying oligomers

Due to the continuing increase in the cost of raw materials, new low-cost acrylated tackifying oligomers have been developed for formulating UV-/EB-curable pressure-sensitive adhesives. All types of adhesive performance, such as removable adhesives, sheet stock and general purpose industrial pressure-sensitive adhesives,... 

Acrylated tackifying oligomers and UV-curable acrylic resins for PSA applications. 

Free-radical, radiation-curable systems generally consist of monomers, oligomers, photoactivators, other resins, and fillers or tackifiers. An ultraviolet source or electron-beam generator is used to cure the systems. As an illustration Stueben (37) describes a typical UV-cured PSA system containing acrylates and polyvinyl ether. McGinniss (38) discusses formulation design related to UV-curable systems. The cationic photoinitiators are shown in Fig. 1. 

The photosensitive resin consists either of a liquid functionalised oligomer, usually with acrylate groups, or a reactive polymer which will be applied as hot melt. There are two main classes of reactive polymers acrylic hot melts which may contain a tackifying monomer, and thermoplastic rubbers which predominantly block copolymers with polybutadiene or polyisoprene chains [3]. A radical-type photoinitiator is always needed to produce, upon UV-exposure, the free radicals that will initiate the polymerisation or cross-linking process. 

Many worldwide polymer efforts are related to the formulation and use of coatings and adhesives. Recent fundamental work on fast polymerization reactions has opened new vistas on the possibility of solventless coatings and adhesives. Adequate monomer blends—usually acrylics or isocyanate capped oligomers—are mixed with thickeners, tackifiers in the case of adhesives, pigments in the case of coatings, stabilizers and other auxiliary products and... 

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