Patent ID: 6506494
Filing Date: 2003-01-14
Classification: C08G,C08J,C08L,C09J,Y10T

Abstract:
A one-part curable epoxy adhesive composition comprisingA. epoxy resin capable of being cured to a cured epoxy resin when exposed to an activated latent curative system; B. a latent curative system in an amount sufficient to cure said epoxy resin, comprising (a) at least one epoxy resin miscible first curative comprising a latent hardener, selected from dicyandiamide and its derivatives, contained substantially as a core within a multiplicity of ambient-temperature-stable, impermeable microcapsules having capsule walls comprised of a thermoplastic polymeric material and (b) at least one epoxy resin latent second curative comprising a latent accelerator which is a metal imidazolate compound of the formula: MLm whereinM is a metal selected from the group of Ag(I), Cu(I), Cu(II), Cd(II), Zn(II), Hg(II), Ni(II) and Co(II), L is an imidazolate of the formula wherein R1, R2, and R3 are selected from a hydrogen atom, an alkyl radical or aryl radical and m is the valence of M, in an amount sufficient when activated to cure said epoxy resin admixed uniformly within said curable epoxy resin, wherein the microcapsule walls isolate the first curative from the second curative.