Patent ID: 8858752

Claim:
An epoxy-based structural adhesive, comprising: A) 25-60 wt % non-rubber-modified epoxy resin, based on weight of the adhesive; B) 5-45 wt % of one or more reactive elastomeric tougheners containing capped isocyanate groups, based on weight of the adhesive; and C) one or more epoxy curing agents; wherein at least 90% of the capped isocyanate groups of the reactive tougheners in the structural adhesive are capped with a ketoxime compound, wherein the one or more elastomeric tougheners comprises at least one of a ketoxime-capped reaction product of i) a polyol with an aliphatic polyisocyanate, or ii) a polyamine with a polyisocyanate; which, when the structural adhesive is cured, has an impact peel strength at room temperature greater than 39 N/mm.