An alpha-cyanoacrylate base adhesive composition comprising 0.0001 to 0.5 part by weight of borofluoric acid on a 100% basis per 100 parts by weight of an alpha-cyanoacrylate monomer, which composition has improved storage stability.
The reaction of 1-acetyl-2-phenylhydrazine with ethoxymethylenemalononitrile yielded [(4-cyano-1-phenylpyrazol-3-yl)aminomethylene]propanedinitrile. Hydrolysis followed by annulation with methyl isocyanate provided a synthetic route to 2-phenylpyrazolo[3,4-d]pyrimidines.
Instant Adhesives (cyanoacrylate-based) sets instantly at room temperature, has powerful adhesive strength, has only one easy-to-use component, and contains no dangerous solvents. Development of the adhesive began in 1949 by Alan E. Ardis of Goodrich Corporation in the US. Then in 1959 it was introduced into the market by FB Joyner and GF Hawkins of Eastman Corporation as Eastman 910. Later improvements and modifications of the synthetic method of the major-ingredient monomer were performed by the leading adhesive manufacturers.
As already described in Three Bond Technical News 21, instant adhesives are one-part solvent-free adhesives that cure rapidly through polymerization at room temperature. These adhesives are used in a wide range of applications across various industries as a result of their strong adhesive strength. However, instant adhesives includes some disadvantages: low resistance to heat, water, and impact. Numerous patents and reports have been submitted on methods of improving these properties.
