Adrian Krzysztof ANTOSIK*, Zbigniew CZECH – Institute of Organic Chemical Technology, West Pomeranian University of Technology in Szczecin, Poland
Please cite as: CHEMIK 2016, 70, 7, 369–374
Pressure-sensitive adhesive (PSA) is materials that develop significant adhesive forces upon contact with a substrate without requiring a chemical reaction without leaving residues on the substrate. They can be defined as a viscoelastic material, which in a solvent free state remains permanently tacky at room temperature. To exhibit this property, a PSA should have cohesive strength that is much higher than its adhesion strength to the substrate. These adhesives play an important role in everyday life and are expanding their use in many sectors of the economy. Mechanically, a PSA is a soft, sticky substance; consequently, a supporting backing is often required to convert it into commercially useful forms, such as tapes and labels [1–3].
Silicone pressure-sensitive adhesives are high-performance adhesives. Since their commercial introduction in the 1960s, silicones PSAs have found uses in a variety of applications. Some of the longestablished applications for silicone PSAs are found in industrial operations (masking, splicing, roller wrapping) as well as in electrical and electronics, medical care and healthcare, and automotive sectors. They are widely used in pressure-sensitive tapes and labels to connect and labeling low-energy surface. High Si–O–Si backbone flexibility of silicones, chemical resistance and outstanding weathering resistance low intermolecular interactions, low surface tension, excellent thermal stability and high UV transparency, often explains why silicone PSAs have superior performance at high- and low-temperature extremes (can be utilized over a wide range of temperatures, from –40 to 300ºC), excellent electrical properties, it makes they are superior compared to organic PSAs. SiPSA with methyl groups and phenyl groups are crosslinking between 120 and 150°C by using organic peroxides. They are inert and very hydrophobic but still have reasonable moisture permeability. Since 2000, was observed increase in interest of new silicone pressure-sensitive adhesives and the possibility of their application. Particular emphasis is placed on solutions such as medical and industrial tape [3–8].
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