Patent ID: 7494708

Claim:
An article comprising: a) an optical film having a first major outer surface and a second major outer surface opposite the first major outer surface; b) a substrate; and c) an optically clear pressure sensitive adhesive layer positioned between said first major outer surface of the optical film and the substrate, said pressure sensitive adhesive layer being free of birefringence and comprising a (meth)acrylate block copolymer comprising i. at least two A block polymeric units that are the reaction product of a first monomer composition comprising an alkyl methacrylate, an aralkyl methacrylate, an aryl methacrylate, or a combination thereof, each A block having a Tg of at least 50° C., said (meth)acrylate block copolymer comprising 20 to 50 weight percent A block; and ii. at least one B block polymeric unit that is the reaction product of a second monomer composition comprising an alkyl (meth)acrylate, a heteroalkyl (meth)acrylate, a vinyl ester, or a combination thereof, said B block having a Tg no greater than 20° C., said (meth)acrylate block copolymer comprising 50 to 80 weight percent B block, wherein the A block polymeric units are present as nanodomains having an average size less than about 150 nanometers in a matrix of the B block polymeric units.