Patent ID: 8242185

Claim:
An adhesive composition comprising: (a) a crosslinkable acrylic copolymer; (b) a multi-functionalized crosslinkable oligomer; wherein the oligomer comprises a functional moiety selected from the group consisting of acrylate, epoxy, hydroxy, and combinations thereof; (c) a photoinitiator which initiates polymerization of the oligomer and is present in an amount of between 0.1 to 5% by weight relative to the dry weight of the acrylic copolymer; and wherein the composition is free of a mono-functionalized oligomer and has: (i) a first thermal curing stage wherein the acrylic copolymer is crosslinked with itself and the partially cured composition exhibits a tan δ value greater than 0.8 as measured at 20° C.; and (ii) a second sequential radiation curing stage wherein the oligomer is crosslinked with itself and the fully cured composition exhibits a storage modulus value of at least 300,000 Pa at 20° C., a shear adhesion failure temperature of at least 425° F. (218.3° C.) at 1 Kg/in 2 (0.155 Kg/cm 2 ), a heated shear value at 160° C. of greater than 10,000 minutes and a peel force value of at least 3.2 lb/in.