Methyl

LE PROPRIETATES IMPERMEABILISATORI DE 2-CYANOACRYLATO METHYLIC USATE COMO AGENTE ADHESIVE IN LE DENTISTERIA.—Le proprietates impermeabilisatori de adhesive 2-cyanoacrylato methylic esseva comparate con illos de varie materiales de cementation que es currentemente usate in le dentisteria. 2-cyanoacrylato methylic, cemento a phosphato de zinc, cemento a oxydo de zinc e eugenol, e cemento Grip esseva usate in cementar applicatos plastic a platte superficies de 36 extrahite dentes human.

A process for preparing methyl .alpha.-cyanoacrylate in which methyl cyanoacetate is reacted with formaldehyde to form a polymer, which is subsequently depolymerized to the monomeric product, comprises using an ester of poly(ethylene glycol) as the solvent for the polymerization and depolymerization reactions.

Prepn. of methyl alpha-cyanoacrylate comprises reacting methyl cyanoacetate with HCHO in a solvent of a poly(ethylene glycol)di-acetate, dipropionate, or dibutyrate, having a number average molecular wt. of 200-400. The formed polymer is then depolymerised to the monomeric prod. the purity of yield is 96% or better.