Adhesive sheet

An adhesive sheet for bonding an unvulcanized rubber provided besides the adhesive sheet onto a metal, comprising:

• a release film having a first film layer made of polypropylene and a second film layer made of polyethylene terephthalate, the first film layer and the second film layer formed as an integrated film;
• an upper adhesive layer formed by applying a solvent dispersed type vulcanization adhesive including a polymer compound containing a cross-linking agent having reactivity with the unvulcanized rubber, the cross-linking agent determined according to a type of the unvulcanized rubber, to a side of the first film layer of the release film, and by drying the solvent dispersed type vulcanization adhesive onto the upper adhesive layer, wherein the upper adhesive layer has reactivity to cause vulcanization with the cross-linking agent by being heated and pressured to adhere the unvulcanized rubber;
• and
• a lower adhesive layer having reactivity with the metal, formed with a lower layer adhesive whose components includes at least one selected from phenol and a phenol-based derivative resin, a bisphenol-based epoxy resin, a polyfunctional aromatic epoxy resin, a chlorinated natural rubber, chlorine-based polyethylene, chlorinated polypropylene, chlorinated polyolefin, an acid scavenger, an amine-based curing agent, a silica-based filler, and carbon black and is different from compositions of the upper adhesive layer, by applying the lower layer adhesive onto the upper adhesive layer after drying the upper adhesive layer and drying the lower layer adhesive.