Patent ID: 6057472
Filing Date: 2000-05-02
Classification: C07C

Abstract:
A process for the preparation of a highly pure alkyl 2-cyanoacrylate, wherein alkyl has 1-10 C atoms, characterized in thata) formaldehyde is reacted with an alkyl cyanoacetate ester by means of a catalyst in a solvent selected from the group consisting of ethylacetate, diglyme, dichloroethane, benzene and mixtures thereof, yielding an oligo-(alkyl 2-cyanoacrylate);b) the product of (a) is separated in the form of a solid;c) the product of (b) is depolymerized under sulfur dioxide atmosphere free from anion scavenger P.sub.2 O.sub.5, hydroquinone and other polymerization inhibitors to yield an alkyl 2-cyanoacrylate with a purity of 98-100%.