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Advancements in Solventless Technology for Silicone PSAs

SpecialChem / Nov 26, 2003

Silicone pressure-sensitive adhesives (PSAs) have been used for many years in areas where typical organic PSAs have failed. One of the most important uses is applications where large temperature extremes occur. The composition of silicone PSAs parallels that of many common organic PSAs. The two main components that dictate the performance of the silicone PSA are a high molecular weight, linear siloxane polymer and a highly condensed, silicate tackifying resin (MQ resin). Figure 1 shows the structure of a typical silicone polymer. Commercially available silicone PSAs use either polydimethylsiloxane (PDMS) or polydimethyldiphenylsiloxane (PDMDPS) polymers that contain silanol functionality at the polymer chain ends. The silicate resin, often referred to as an MQ resin, is a solid particle supplied in a hydrocarbon solvent. The MQ name derives from the fact that its structure consists of a core of three-dimensional Q units (SiO4/2) surrounded by a shell of M units (Me3SiO). The resin also contains a level of silanol functionality on the surface.

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