Cyanoacrylate adhesives are generally known as “instant adhesives”. These are thin or deliberately thickened esters of cyanoacrylic acid, which are commercially available in 1K form as monomers and react to the actual adhesive polymer by a polymerization reaction in the joint gap. Polar groups, such as the OH ions in the moisture layer on the surface of the parts to be joined, must be present before curing can begin. These are anionic polymerizations, i.e. nucleophiles such as organic nitrogen compounds, sulfur compounds, or alcohols and water which attack the double bond in the monomer molecule. The polymerization process is very fast, so that a solid compound is formed within a few seconds.