Pressure-sensitive adhesive composition

A surface protective film comprising:

• a surface protective base layer;
• and
• an antistatic pressure-sensitive adhesive layer formed on one or both surfaces of the base layer, and comprising a pressure-sensitive adhesive composition in a crosslinked state, where the pressure-sensitive adhesive composition, having a low speed peel-off strength measured at a peeling angle of 180° and a peeling speed of 0.3 m/min with respect to an adherent having a surface energy of 30 mN/m or less is 1 to 40 gf/25 mm and high speed peel-off strength measured at a peeling angle of 180° and a peeling speed of 30 m/min with respect to an adherent having a surface energy of 30 mN/m or less is 10 to 150 gf/25 mm comprises:
• an acrylic polymer comprising polymerization units of:
• 0.1 to 6.0 parts by weight of a monomer of Formula 1, 1 to 15 parts by weight of a dialkyl (meth)acrylamide, and 12 to 20 parts by weight of a hydroxyl group-containing monomer;
• an ionic compound;
• and
• a crosslinking agent;
• where Q is hydrogen or an alkyl group having 1 to 4 carbon atoms, U is an alkylene group having 1 to 4 carbon atoms, Z is hydrogen, an alkyl group having 1 to 4 carbon atoms, or an aryl group having 6 to 20 carbon atoms, and m is a number of 1 to 12,
• wherein the hydroxyl group-containing monomer comprises 0.1 to 15 parts by weight of a first monomer represented by Formula 2, in which an alkylene group of A and B has 1 to 3 carbon atoms, and 0.1 to 5 parts by weight of a second monomer represented by Formula 2, in which an alkylene group of A and B has 4 to 8 carbon atoms, and wherein a weight ratio (A/B) of the first monomer in the acrylic polymer and the second monomer in the acrylic polymer is in a range of from 4 to 10,
• where Q is hydrogen or an alkyl group having 1 to 4 carbon atoms, A and B may be each independently an alkylene group, and n is a number of 0 to 10,
• and wherein the crosslinking agent is an aliphatic isocyanate crosslinking agent.