Patent ID: 9181463
Filing Date: 2015-11-10
Classification: C08G,C08K,C09J,Y10T

Abstract:
1. A one-part structural adhesive comprising: A) at least one epoxy resin; B) a reactive elastomeric toughener containing capped isocyanate groups; and C) one or more epoxy curing agents; wherein all reactive elastomeric tougheners containing capped isocyanate groups present in the one-part structural adhesive are formed by a) reacting an excess of a polyisocyanate with a 300-3000 equivalent weight polyol or with a mixture of a 300-3000 equivalent weight polyol and a branching agent, to form an isocyanate-terminated prepolymer; b) reacting the isocyanate-terminated prepolymer with a chain extender to produce a chain extended, isocyanate-terminated prepolymer, and c) capping 100% of the terminal isocyanate groups of the chain extended, isocyanate-terminated prepolymer with a capping agent selected from a monophenol, a polyphenol and an aminophenol.