Activator compositions for cyanoacrylate adhesives

C - Chemistry – Metallurgy – 09 – J

Patent

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C09J 4/00 (2006.01) C09J 5/02 (2006.01) C09J 5/04 (2006.01)

Patent

CA 2408512

An activator composition for the accelerated hardening of cyanoacrylate adhesives, wherein the activator comprises a member selected from the group consisting of: aromatic heterocyclic compounds having at least one N hetero atom in the ring(s) such as pyridines, quinolines and pyrimidines and substituted on the ring(s) with at least one electron - withdrawing group which decreases the base strength of the substituted compound compared to the corresponding unsubstituted compound, mixtures of any of the foregoing with each other, and/or with N,N-dimethyl-p-toluidine, and mixtures of any of the foregoing and/or N,N-dimethyl-p-toluidine with an organic compound containing the structural element, -N=C-S-S-, such as dibenzothiazyl disulfide. 6,6'dithiodinicotinic acid, 2,2'-dipyridyl disulfide, and bis(4-t-butyl-1- isopropyl-2-imidazolyl) disulfide. An activator composition may comprise a solution of one or more activators in a solvent mixture which comprises a volatile hydrocarbon and a cyclic ketone.

Compositions d'activation destinées au durcissement accéléré d'adhésifs à base de cyanoacrylate et dans lesquelles l'agent d'activation comprend un des membres du groupe suivant: composés hétérocycliques aromatiques possédant au moins un hétéroatome N dans le ou les noyaux, tels que des pyridines, quinolines et pyrimidines et substitués dans ce ou ces noyaux par au moins un groupe accepteur d'électrons qui diminue la puissance de base du composé substitué, en comparaison au composé correspondant non substitué; mélanges de n'importe quels éléments précités entre eux et/ou avec N,N-diméthyl-p-toluidine; et mélanges de n'importe quels éléments précités entre eux et/ou N,N-diméthyl-p-toluidine avec un composé organique contenant un élément structurel -N=C-S-S- tel que le bisulfure de dibenzothiazyl, l'acide 6,6'-dithiodinicotinique, le bisulfure de 2,2'-dipyridyl et le bisulfure de bis(4-t)butyl-1-isopropyl-2-imidazolyl. Une composition d'activation peut comprend une solution d'un ou plusieurs agents d'activation dans un mélange de solvants qui comprend un hydrocarbure volatil et une cétone cyclique.

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