Adhesive composition, adhesive film comprising same, back plate film comprising adhesive film and plastic organic light-emitting display comprising adhesive film

1. An adhesive composition comprising:

a (meth)acrylate-based resin; and

a polymer having a melting temperature (Tm) of 35° C. to 50° C.,

wherein the (meth)acrylate-based resin comprising 50 parts by weight to 70 parts by weight of an alkyl acrylate, 5 parts by weight to 40 parts by weight of an alkyl methacrylate, 0.1 parts by weight to 10 parts by weight of a nitrogen-containing monomer, and 1 part by weight to 30 parts by weight of a hydroxyalkyl acrylate,

wherein the polymer includes a copolymer of a monofunctional polysiloxane and two monomers,

wherein the monofunctional polysiloxane is included in an amount of greater than or equal to 10 parts by weight and less than or equal to 40 parts by weight, and the two monomers are included in a total amount of greater than or equal to 60 parts by weight and less than or equal to 90 parts by weight, based on 100 parts by weight of the polymer,

wherein the polymer is included in an amount of 1 part by weight to 10 parts by weight, based on 100 parts by weight of the (meth)acrylate-based resin, and

wherein the two monomers are each independently represented by Chemical Formula 1:

wherein in Chemical Formula 1,

X is N or O;

R 1 is hydrogen or a methyl group; and

n is an integer of 10 to 30.

2. The adhesive composition of claim 1 , wherein the n is an integer of 16 to 22.

3. The adhesive composition of claim 1 , wherein the two monomers represented by Chemical Formula 1 are each independently stearyl methacrylate (STMA) or stearyl acrylate (STA).

4. The adhesive composition of claim 1 , further comprising one or more of a solvent, a dispersant, a photoinitiator, a thermal initiator or a tackifier.

5. An adhesive film comprising:

a base film; and

an adhesive sheet comprising the adhesive composition of claim 1 or a cured material thereof provided on a surface of the base film.

6. The adhesive film of claim 5 , further comprising a release film on a surface of the adhesive sheet opposite to the surface in contact with the base film.

7. The adhesive film of claim 5 , wherein initial 180° adhesive strength after leaving unattended for 2 hours at 23° C. after bonding the adhesive film to a stainless steel SUS304 substrate is 100 gf/inch or less, and subsequent 180° adhesive strength after heat treating for 20 minutes at 40° C. is 500 gf/inch or greater.

8. The adhesive film of claim 7 , wherein ratio of the subsequent 180° adhesive strength to the initial 180° adhesive strength is greater than or equal to 3 and less than or equal to 50.

9. The adhesive film of claim 5 , wherein the adhesive sheet has a thickness of greater than or equal to 3 μm and less than or equal to 100 μm.

10. The adhesive film of claim 5 , wherein the adhesive film has a thickness of greater than or equal to 50 μm and less than or equal to 300 μm.

11. A backplate film comprising:

the adhesive film of claim 5 ; and

a protective film provided on a surface of the base film opposite to a surface in contact with the adhesive sheet of the adhesive film.

12. A plastic organic light emitting display comprising:

the adhesive film of claim 5 ;

a plastic substrate provided on a surface of the adhesive sheet opposite to the surface in contact with the base film of the adhesive film; and

an organic light emitting layer provided on a surface of the plastic substrate opposite to the surface in contact with the adhesive film.

13. The plastic organic light emitting display of claim 12 , further comprising a protective film provided on the surface of the base film opposite to a surface in contact with the adhesive sheet of the adhesive film.