Rubber-based adhesive composition having excellent durability

1. An adhesive composition comprising:

a butyl-based rubber;

a tackifier having a softening point of 90° C. or more; and

a curing agent selected from the group consisting of an acrylate resin, a methacrylate resin, an isocyanate resin, a melamine resin, a urethane resin, an epoxy resin, an acid anhydride, a polyamine resin, and a carboxy group-containing polymer,

wherein

the butyl-based rubber has an amount of 50 wt % to 70 wt % relative to total weight of the adhesive composition,

the tackifier has an amount of 5 wt % to 10 wt % relative to total weight of the adhesive composition, and

the butyl-based rubber includes repeat units derived from isoprene having an amount of 1 mol % to 5 mol % of the total repeat unit.

2. The adhesive composition of claim 1 , wherein the butyl-based rubber includes at least one selected from the group consisting of a butyl rubber, a bromo-butyl rubber, and a chlorinated butyl rubber.

3. The adhesive composition of claim 1 , wherein the butyl-based rubber has a weight average molecular weight of 50,000 to 2,000,000.

4. The adhesive composition of claim 1 , wherein the tackifier is a rosin-based resin, a rosin ester-based resin, a linear hydrocarbon-based resin or a cyclic olefin-based resin to which hydrogen is added.

5. The adhesive composition of claim 1 , wherein the tackifier has a weight average molecular weight of 500 to 2,000.

6. The adhesive composition of claim 1 , further comprising:

at least one selected from the group consisting of a UV stabilizer, a photoinitiator, a thermal initiator, an antioxidant, a filler and a plasticizer.

7. The adhesive composition of claim 1 , wherein a water vapor transmission rate (WVTR) of the adhesive composition is 10 g/m 2 ·24 hr at a temperature of 38° C. and relative humidity of 90%.

8. The adhesive composition of claim 1 , wherein the curing agent is hexane-1,6-diol diacrylate (HDDA).