Acrylic pressure sensitive adhesive and surface finishing material comprising the same

An acrylic pressure-sensitive adhesive, comprising an acrylic copolymer formed by an emulsion copolymerization of:

• i) 81 to 96% by weight of an alkyl (meth) acrylic acid ester monomer having an alkyl group with a carbon number of 4 to 14;
• ii) 1 to 10% by weight of vinyl acetate;
• iii) 1 to 10% by weight of an acrylonitrile monomer;
• iv) 0.1 to 2% by weight of a crosslinker including 15 moles of an alkylene oxide group, and having two or more groups of an acrylate group, a vinyl group or a combination thereof;
• v) 0.5 to 2 parts by weight of alkyl diphenyl oxide disulfonate as an anionic surfactant based on total 100 parts by weight of components i)-iv);
• and
• vi) 0.2 to 2 parts by weight of an ammonium persulfate as an aqueous polymerization initiator, based on total 100 parts by weight of components i)-iv),
• wherein the acrylic copolymer has a gel content of 50% by weight to 70% by weight, and
• wherein the acrylic pressure-sensitive adhesive is an aqueous emulsion adhesive.