Patent ID: 7297400

Claim:
An optical construction comprising an optical film having a major surface; an adhesive applied to at least a portion of said major surface, wherein said adhesive comprises an acrylate copolymer; a mono-acrylate oligomer; a multi-acrylate oligomer having 2 to 5 acrylate functionalities; and a photoinitiator that initiates free radical polymerization; wherein said mono-acrylate oligomer is present in an amount greater than the amount of said multi-acrylate oligomer, and wherein said mono-acrylate oligomer, multi-acrylate oligomer and photoinitiator, when blended with said acrylate copolymer, forms a pressure sensitive adhesive, and when cured, forms a cured adhesive comprising at least a semi-interpenetrating polymer network having an average molecular weight between crosslinks (M c ) greater than about 3000, said cured adhesive having a peel strength greater than about 40 N/dm; and a substrate bonded to said optical film, having said adhesive cured therebetween.