Temperature-changeable adhesive sheet and temperature-changeable adhesive sheet manufacturing method using same

An adhesive sheet comprising a first adhesive layer and a second adhesive layer consecutively provided on a barrier film, wherein the first adhesive layer is provided on a barrier layer of the barrier film,

• wherein an initial adhesive strength between the second adhesive layer and a SUS304 substrate is 200 gf/in or less, and an adhesive strength between the second adhesive layer and a SUS304 substrate, after 20 minutes passed under a condition of 50° C. and 5 atmospheres, is 400 gf/in or greater,
• wherein the first adhesive layer comprises a first adhesive composition comprising a copolymer of a diene and an olefin-based compound comprising one carbon-carbon double bond,
• wherein the second adhesive layer comprises a second adhesive composition comprising;
• a polymer comprising a polymerization unit of an alkyl (meth)acrylate, a hard comonomer and a crosslinkable monomer, wherein the polymer comprises 80-95 parts by weight of alkyl (meth)acrylate, 1-30 parts by weight of hard comonomer, and 1-40 parts by weight of crosslinkable monomer on the basis of 100 parts by weight of the polymer, wherein a total amount of the alkyl (meth)acrylate, the hard comonomer, and the crosslinkable monomer is 100 parts by weight, and
• a polymer comprising a unit derived from a silicon-based hydrophobic monomer, wherein the polymer comprising a unit derived from a silicon-based hydrophobic monomer is included in 0.01 parts by weight to 10 parts by weight based on 100 parts by weight of the second adhesive composition
• wherein the adhesive sheet has a moisture permeability (WVTR) of 10 g/m2·24 h or less, as measured in accordance with ASTM F1249.