Latent, thermal cure accelerators for epoxy-aromatic amine...

C - Chemistry – Metallurgy – 08 – G

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C08G 59/68 (2006.01) C08G 59/18 (2006.01) C08G 59/50 (2006.01)

Patent

CA 2168018

A thermally-curable aromatic amine-epoxy composition comprises: (a) at least one polyepoxy compound; (b) a curing amount of at least one aromatic polyamine compound; and (c) a catalytically effective amount of at least one cure accelerator compound which is a .pi.-electron acceptor, and which lowers the cure exotherm peak temperature (as measured by differential scanning calorimetry (DSC) at 10 °C per minute) of the composition by at least about 8 percent relative to the corresponding composition without the cure accelerator. Such accelerator compounds moderate and/or accelerate the thermal curing of aromatic amine-epoxy resins, enabling cure to occur at lower temperatures and/or in shorter time periods than those reduced for the unaccelerated composition.

Une composition amine aromatique/époxy thermodurcissable comprend: (a) au moins un composé polyépoxy; (b) une quantité, induisant le durcissement, d'au moins un composé polyamine aromatique; et (c) une quantité, à action catalytique, d'au moins un composé accélérateur du durcissement qui est un accepteur d'électrons pi , et qui abaisse la température maximale de la réaction exothermique de durcissement de la composition (mesurée par calorimétrie à compensation de puissance à 10 DEG C par minute) d'au moins 8 % environ par rapport à la composition correspondante sans l'accélérateur de durcissement. Ces composés accélérateurs modèrent et/ou accélèrent le durcissement thermique des résines amine aromatique/époxy, ce qui permet un durcissement à des températures plus basses et/ou en un temps plus court que ceux de la composition sans accélarateur.

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