Adhesive composition and adhesive film comprising same

1. An adhesive composition comprising:

an acrylic first polymer having a glass transition temperature of 0° C. or less;

a second polymer comprising a unit derived from a monomer represented by Chemical Formula 1 and a unit derived from a monomer represented by Chemical Formula 2 or Chemical Formula 3; and

a crosslinking agent,

wherein the acrylic first polymer comprises 50 to 70 parts by weight of alkyl acrylate, 5 to 40 parts by weight of alkyl methacrylate, and 1 to 30 parts by weight of hydroxyalkyl acrylate, based on 100 parts by weight of the acrylic first polymer,

wherein a content of the second polymer is 0.1 parts by weight to 20 parts by weight, based on 100 parts by weight of the acrylic first polymer,

wherein a content of the unit derived from the monomer represented by Chemical Formula 1 is 35 parts by weight to 90 parts by weight, based on 100 parts by weight of the second polymer:

wherein in Chemical Formulae 1 to 3,

R 1 is hydrogen or a methyl group;

R 2 is hydrogen, or an alkyl group;

R 3 is monofunctional acrylate;

m is an integer of 0 to 200; and

n is an integer of 10 to 30.

2. The adhesive composition of claim 1 , wherein the second polymer comprises the unit derived from the monomer represented by Chemical Formula 1 and the unit derived from the monomer represented by Chemical Formula 2.

3. The adhesive composition of claim 1 , wherein a content of the unit derived from the monomer represented by Chemical Formula 2 or 3 is 10 parts by weight to 65 parts by weight, based on 100 parts by weight of the second polymer.

4. The adhesive composition of claim 1 , wherein the adhesive composition further comprises one or more selected from a solvent, a dispersant, a photoinitiator, a thermal initiator or a tackifier.

5. An adhesive film comprising:

a substrate layer; and

an adhesive sheet provided on one surface of the substrate layer and containing the adhesive composition according to claim 1 or a cured product thereof.

6. The adhesive film of claim 5 , comprising a release sheet on one surface of the adhesive sheet.

7. The adhesive film of claim 5 , wherein the adhesive sheet has an initial adhesive force, after bonding to stainless steel (SUS304 substrate) and then allowing to stand at 23° C. for 2 hours, of 100 gf/inch or less, and a later adhesive force, after thermal treatment at 70° C. for 20 minutes, of 300 gf/inch or more.

8. The adhesive film of claim 7 , wherein the later adhesive force is not less than 3 times and not more than 100 times of the initial adhesive force.

9. The adhesive film of claim 5 , wherein the adhesive sheet has a thickness of not less than 3 μm and not more than 500 μm.

10. A method for producing an adhesive film comprising:

preparing a substrate layer; and

coating one surface of the substrate layer with the adhesive composition according to claim 1 to form an adhesive sheet.

11. The method of claim 10 , further comprising drying the adhesive sheet after forming the adhesive sheet on one surface of the substrate layer.

12. An adhesive composition comprising:

an acrylic first polymer having a glass transition temperature of 0° C. or less;

a second polymer comprising a unit derived from a monomer represented by Chemical Formula 1 and a unit derived from a monomer represented by Chemical Formula 2 or Chemical Formula 3; and

a crosslinking agent,

wherein a content of the second polymer is 0.1 parts by weight to 20 parts by weight, based on 100 parts by weight of the acrylic first polymer,

wherein a content of the unit derived from the monomer represented by Chemical Formula 1 is 35 parts by weight to 90 parts by weight, based on 100 parts by weight of the second polymer:

wherein in Chemical Formulae 1 to 3,

R 1 is hydrogen or a methyl group;

R 2 is hydrogen, or an alkyl group;

R 3 is monofunctional acrylate;

m is an integer of 0 to 200; and

n is an integer of 20 to 30.