Surface protective film for optical member

A surface protective film comprising an adhesive layer on one surface of a substrate film, wherein:

• the adhesive layer is a cured product of a composition containing:
• a urethane-based resin having a photoreactive group at an end or side chain thereof;
• a monofunctional (meth)acrylate monomer;
• a crosslinking agent having two or more photoreactive groups at an end thereof;
• a peel strength adjusting agent;
• and a photoinitiator, the composition being solvent-free;
• and
• the adhesive layer has a peel strength of 0.5 gf/in to 10 gf/in, as measured on glass at a peel angle of 180° and a peel rate of 1.8 m/min, and a wetting time of 1 to 10 seconds on glass,
• wherein the monofunctional (meth)acrylate monomer is provided in an amount of 95 parts by weight to 140 parts by weight based on 100 parts by weight of the urethane-based resin,
• wherein the crosslinking agent is provided in an amount of 10 parts by weight to 36 parts by weight based on 100 parts by weight of the urethane-based resin,
• wherein the peel strength adjusting agent is provided in an amount of 42 parts by weight to 95 parts by weight based on 100 parts by weight of the urethane-based resin and,
• wherein the peel strength adjusting agent is one selected from the group consisting of diisononylcyclohexane-1,2-dicarboxylate (DINCH), bis-2-ethylhexyl hexanedioate (DEHA), dioctyl adipate (DOA), diisononyl adipate (DINA), dipropylene glycol dibenzoate (DPGDB), triethylene glycol bis-2-ethylhexanoate (TEG-EH), isopropyl palmitate (IPP), isopropyl myristate (IPMS), a citrate-based compound, and mixtures thereof.