Use of urea derivatives as accelerators for epoxy resins

C - Chemistry – Metallurgy – 08 – G

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C08G 59/40 (2006.01)

Patent

CA 2527099

Disclosed is the use of asymmetrically substituted urea derivatives of general formula (I), wherein R1 and R2 independently represent a linear or branched aliphatic hydrocarbon radical comprising 1 to 4 C atoms, as accelerators in combination with dicyandiamide as a latent hardener for epoxy resin systems bases on optionally halogenated bisphenols A or F and resorcinol or tetrakis- phenyl-olethane. The inventive accelerator/hardener combination has the advantage of providing excellent reactivity and very good stability during storage, for example. Furthermore, the correspondingly hardened resins have excellent mechanical properties.

L'invention concerne l'utilisation de dérivés d'urée à substitution asymétrique de formule (I), dans laquelle R?1¿ et R?2¿ représentent chacun indépendamment un reste hydrocarbure aliphatique linéaire ou ramifié comportant 1 à 4 atomes C. Ces dérivés servent d'accélérateurs en combinaison avec de la dicyandiamide en tant que durcisseur latent pour des systèmes de résine époxy, à base de bisphénols éventuellement halogénés de type A ou F, ou bien à base de résorcinol ou de tétrakisphényloléthane. Les avantages de la présente combinaison accélérateur/durcisseur sont, par exemple, une excellente réactivité et une très bonne stabilité au stockage, les propriétés mécaniques des résines durcies en conséquence étant aussi remarquables.

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