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Solvent-free acrylic and polyurethane pressure-sensitive adhesives (PSA) form very interesting new groups of polymers. The research and development of these polymers with self-adhesive properties is a quite interesting research field with full innovation and expected further exciting development in this area. Solvent-free acrylic and polyurethane PSA are still something of a speciality. They are photoreactive and UV-crosslinkable, and after crosslinking are characterized by sufficient thermal resistance, excellent moisture resistance and very good adhesion to wide range of typical surfaces.
The goal of this article is to review the development of photoreactive UV-crosslinkable acrylic pressure-sensitive adhesives (PSAs) characterized by low viscosity, which can be coated at room temperature in the form of adhesive layers and are characterized by removable properties after UV-crosslinking. Surfactants and stearic acid have been used to improve the performance of the acrylic PSA, too. They are used for the manufacturing of removable and repositionable self-adhesive products, such as easy peel-able decorative films and wide range version of post-it articles.
3,4-Dihydropyrimidin-2(1H)-ones are synthesized by the three-component condensation of aromatic aldehydes, _-ketoesters and urea or thiourea in methanol or under solvent- free conditions, using aluminum hydrogensulfate as the catalyst
Michael addition of amides to alfa, beta-unsaturated esters efficiently proceed in the presence of K2CO3 and tetrabutylammonium bromide (TBAB) as a phase-transfer catalyst under microwave irradiation to afford N-alkylated amides in high yields and short reaction times.
The present publication is related to a process for producing the non-solvent acrylic pressure-sensitive adhesive (PSA). New applications and technical specifications stimulate the continuous development of new methods of polymerization of solvent-free acrylate. New synthesis of solvent-free acrylics includes polymerization in the reactor with removal of the solvent and polymerization of the carrier. The polymerization process is connected with UV-crosslinking.
1,5-benzodiazepines have been synthesized by Nano Zirconia and Nano Sulfated Zirconia in solvent free conditions. Synthesis was carried out by conventional as well as microwave method. Benzodiazepines were synthesized by reacting o-phenylenediamine and few ketones in the presence of catalytic amount of Nanoparticles. Particles used were sized in between 53-100 nm. Nanoparticles were characterized by FT-IR, DLS and powder XRD analysis.
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