Surface protection film, and method for manufacturing organic light-emitting electronic device

A surface protective film comprising:

• a base layer;
• and
• an adhesive layer provided on one surface of the base layer,
• wherein the adhesive layer comprises a cured product of an adhesive composition, comprising:
• a urethane polymer;
• an acrylic polymer;
• and a curing agent, and
• wherein an adhesive strength maintenance ratio of the adhesive layer, calculated by Equation 1, is 50% or more:
• Adhesive strength maintenance ratio=(a high temperature peel strength)/(a low temperature peel strength)×100, <Equation 1>
• wherein the low temperature peel strength is a peel strength when the adhesive layer of the surface protective film is attached to glass and stored at 25° C. for 24 hours, and then the surface protective film is peeled off from the glass at a peel speed of 1.8 m/min, a peel angle of 180°, and a temperature of 25° C., and
• wherein the high temperature peel strength is a peel strength when the adhesive layer of the surface protective film is attached to glass, stored at 25° C. for 24 hours, and then left to stand at 40° C. for 1 minute, and the surface protective film is peeled off from the glass at a peel speed of 1.8 m/min, a peel angle of 180°, and a temperature of 40° C.