Patent ID: 7547373

Claim:
A two-part epoxy adhesive comprising: a) a resin component comprising a mixture of epoxy resin, and an internally flexibilized epoxy resin, and b) a hardener component consisting essentially of a mixture by weight of: 20-80% flexibilizer, wherein said flexibilizer is selected from amine terminated butadiene acrylonitrile adducts or carboxyl terminated butadiene acrylonitrile adducts, 5-30% unmodified aliphatic amine, wherein said unmodified aliphatic amine comprises an unmodified glycol ether base aliphatic amine, 10-50% modified aliphatic amine, wherein said modified aliphatic amine comprises an AEP base modified amine, 0-15% unmodified or modified polyamide, 1-10% accelerator, wherein said accelerator comprises a tertiary amine accelerator, and optionally 5-20% plasticizer/accelerator that acts as both a plasticizer and an accelerator; wherein a reactive mixture of said resin component and said hardener component has an initial cure time of less than 3 hours and a complete cure time of approximately 24 hours; wherein after said resin component and said hardener component are mixed and reacted the cured epoxy adhesive has a tensile elongation at room temperature of greater than 30%.