Patent ID: 7645827

Claim:
A pressure-sensitive adhesive comprising: (a) a polymer comprising: (i) 90 to 97 parts by weight of monomer units of an (meth)acrylic acid ester of non-tertiary alcohol, said alcohol having from 1 to 14 carbon atoms; (ii) 1 to 10 parts by weight of monomer units of an acid functional monomer; (iii) 0 to 10 parts by weight of monomer units of a second polar monomer; (iv) 0 to 5 parts by weight vinyl monomer units; and (v) 0 to 1 parts by weight crosslinking agent; and (b) 1 to 8 parts by weight of colloidal silica nanoparticles having an average particle diameter of 20 nanometers or less, based on 100 parts of polymer, wherein said colloidal silica nanoparticles are not surface modified and wherein the nanoparticles have a polydispersity of 2.0 or less.