A cyanoacrylate composition suitable as cyanoacrylate adhesives for bonding porous materials, shaping material and fingerprint detectors comprises a 2-cyanoacrylate as a main component and at least one of crown ethers, polyalkylene oxides and derivatives of the polyalkylene oxides as a curing accelerator and at least one of hydrophobic silicas
Alpha-cyanoacrylate adhesives of fluorescent color having incorporated therein at least one member selected from C.I. Solvent Green 5; C.I. Acid Red 50 and C.I. Acid Red 52.
A cyanoacrylate-based adhesive composition is disclosed. The cyanoacrylate-based adhesive composition includes a cyanoacrylate monomer, and a bleachable dye including a Michler's hydrol cation or derivatized Michler's hydrol cation, paired with a non-nucleophilic anion that provides a stable color to the cyanoacrylate-based adhesive.
The advent of instant adhesive dates back to 1949, when Goodrich Co. of the US discovered alpha-cyanoacrylate synthesis method. Since 1959, when the world’s first instant adhesive “Eastman 910” appeared in the market, practical applications are going on around the world and improvements on cyanoacrylate adhesive are under way night and day seeking for higher functionality. Instant adhesive means an adhesive which can stick adherends in seconds, as understood by the name.
It has passed 38 years since instant adhesives were first introduced to the global market in 1957. Today, instant adhesives are used in a variety of applications for industrial, medical, and general domestic purpose. The main reason that usage fields of instant adhesives have expanded can be found on its ease of use, which is one-part adhesive and bonds any materials strongly and instantaneously at room temperature.
Self-immolative polymers (SIPs) are unique macromolecules that are able to react to multiple types of environmental influences by giving amplified response outputs. When triggering moieties installed at SIP chain ends are activated by their corresponding stimuli, a spontaneous head-to-tail depolymerization ensues, often involving multitopic release of small molecules. SIP designs have evolved a high degree of modularity in each of their functional components, enabling a broad range of utility and applications-driven tuning.
Methods for the synthesis, properties and applications of alkyl 2-cyanoacrylates are surveyed. The reactions of alkyl 2-cyanoacrylates with various nucleophiles (thiols, alcohols, diols, hydrogen sulfide, phosphines, etc.) including a new reaction involving insertion of isocyanates into the C=C bonds in the adducts of alkyl 2-cyanaocrylates with trialkylphosphines are considered. The prospects for the use of alkyl 2-cyanoacrylates in organic synthesis, in the chemistry of polymers and in the chemistry of adhesives are described. The bibiolgraphy includes 177 references.
The conditions for the Knoevenagel synthesis of 2-cyanoacrylates containing double and triple bonds in the alkoxycarbonyl group have been studied. It was found that the esters are formed in 10–70 % yields by the condensation of the respective cyanoacetates with formaldehyde in the 1∶1 ratio in the presence of piperidine, followed by the pyrolysis of the oligomers formedin vacuo at 170–200 °C in the presence ofpara-toluenesulfonic acid.
The properties of 2-cyanoacrylates are considered. The geometric structure of 2-cyanoacrylic acid and its 1-adamantylmethyl ester is established by X-ray diffraction methods. Two methods for expanding the temperature range of the service lives of adhesives based on crosslinked 2-cyanoacrylates are considered. The first method is based on the incorporation of unsaturated carbon-carbon bonds into ester fragments of alkyl 2-cyanoacrylates followed by crosslinking via these bonds.
