Patent ID: 7678847

Claim:
An encapsulated curable adhesive composition comprising: a) a two part curative, comprising a first-part curative comprising a free radical initiator and a second-part curative, b) a first population of polymeric microcapsules encasing both a monomer and the first-part curative forming a monomer and free radical initiator blend, the monomer being reactive with the second part curative, the first population of polymeric microcapsules being substantially impermeable to both parts of the curative, the monomer being a mixture of a first monomer component having a viscosity greater than 500 milliPascal-second selected from the group consisting of 50 parts of melamine acrylate, 40 parts of epoxy acrylate, 50 parts of urethane dimethacrylate and 50 parts of polybutadiene; and a second monomer component being the balance to make 100 parts by weight of monomer, the second monomer component being a 50/50 ratio by weight of a blend of hexane diol dimethacrylate and tetrahydrofurfuryl methacrylate, wherein the viscosity of the mixture of the first monomer component and the second monomer component is less than 500 milliPascal-second, wherein the monomer and the free radical initiator blend has a viscosity of a free flowing liquid of less than 500 milliPascal-second at 25° C., c) the second-part curative comprising a catalyst and an activator, the second-part curative being external to the first population of microcapsules and wherein the activator of the second-part curative is separately encapsulated forming a second population of polymeric microcapsules.