Adhesive sheet, manufacturing method thereof, optical filter and plasma display panel

A pressure-sensitive adhesive sheet comprising:

• a base film having a corona-treated layer, into which hydroxyl groups are introduced, on one or both sides thereof;
• and
• a pressure-sensitive adhesive layer which is formed on the corona-treated layer of the base film, and which includes a cured product of a pressure-sensitive adhesive composition comprising a carboxyl group-containing acrylic copolymer;
• a multifunctional isocyanate compound capable of reacting with the hydroxyl groups of the corona-treated layer;
• a hardener selected from the group consisting of an epoxy hardener and an aziridine hardener;
• and 0.001 to 0.01 parts by weight of a siloxane compound relative to 100 parts by weight of the carboxyl group-containing acrylic copolymer,
• wherein the carboxyl group-containing acrylic copolymer comprises 85 to 99.9 parts by weight of a (meth)acrylic acid ester monomer including a hydrocarbon group having 1 to 12 carbon atoms and 0.1 to 15 parts by weight of a carboxyl group-containing monomer, relative to 100 parts by weight of the acrylic copolymer,
• wherein the hardener is comprised in the pressure-sensitive adhesive composition in an amount of 0.01 to 0.03 parts by weight relative to 100 parts by weight of the acrylic copolymer, and
• wherein the multifunctional isocyanate compound of the pressure-sensitive adhesive layer reacts with the hydroxyl groups of the corona-treated layer, and the hardener forms a crosslinking structure by reacting with the carboxyl group of the acrylic copolymer.