Adhesive film, method for manufacturing same, and foldable display device comprising same

An adhesive film comprising:

• a first (meth)acrylate resin;
• and
• at least one monomer of the following Chemical Formula 1,
• in the Chemical Formula 1,
• R1 is hydrogen;
• or an alkyl group;
• R2 is a hydroxyl group;
• and
• m is an integer of 0 to 200;
• wherein an early peel strength of the adhesive film after stored for 1 day at 23° C. is greater than 0 gf/inch and less than or equal to 10 gf/inch, and a late peel strength of the adhesive film after stored for 5 days at 40° C. is greater than 0 gf/inch and less than or equal to 11 gf/inch;
• the adhesive film is cut to a size of one inch×one inch to attach one surface thereof to a first substrate and then stored for 1 day at 23° C. before measuring the early peel strength or stored for 5 days at 40° C. before measuring the late peel strength;
• and
• the first substrate is a silicone-based substrate,
• wherein the first (meth)acrylate resin has a weight average molecular weight of greater than or equal to 1,000,000 g/mol and less than or equal to 5,000,000 g/mol,
• wherein the first (meth)acrylate resin is a copolymer of an alkyl (meth)acrylate-based resin and a crosslinkable functional group-containing monomer,
• wherein the alkyl (meth)acrylate-based resin included in the first (meth)acrylate resin comprises one or more monomers selected from the group consisting of an alkyl (meth)acrylate having 1 to 10 carbon atoms and one or more monomers selected from the group consisting of an alkyl (meth)acrylate having 11 to 30 carbon atoms,
• wherein the crosslinkable functional group-containing monomer of the first (meth)acrylate resin is one or more selected from the group consisting of (meth)acrylic acid and 4-hydroxybutyl (meth)acrylate,
• wherein the alkyl (meth)acrylate-based resin is included in greater than or equal to 70 parts by weight and less than or equal to 99 parts by weight based on 100 parts by weight of the first (meth)acrylate resin,
• wherein the crosslinkable functional group-containing monomer is included in greater than or equal to 1 part by weight and less than or equal to 30 parts by weight based on 100 parts by weight of the first (meth)acrylate resin, and
• wherein a storage modulus of the adhesive film at 20° C. (G1) and a storage modulus of the adhesive film at −20° C. (G2) satisfy the following Equation (1) and Equation (2) as measured at a frequency of 1 Hz, 5% strain, and a temperature increasing rate of 10° C./minute in a range of −20° C. to 90° C.:
• 1×104 Pa≤G1≤9.5×104 Pa [Equation (1)]
• G1≤G2≤5.0×105 Pa [Equation (2)]