Internal pouch held in a double-structured aerosol can

An internal pouch held in a double-structured aerosol can, composed of a first internal pouch for containing a first agent and a second internal pouch for containing a second agent, the first agent containing a strongly alkaline component and the second agent comprising an acid component that compose an oxidizing hairdye, and the aerosol can being capable of simultaneously ejecting the first agent and the second agent;

• wherein
• said first internal pouch has a layer constitution that includes at least a polyolefin inner layer, an adhesive resin layer on the inner layer side, an aluminum foil, an adhesive resin layer on the outer layer side and a thermoplastic resin outer layer;
• said second internal pouch has a layer constitution that includes at least a polyolefin inner layer, an adhesive resin layer on the inner layer side, an aluminum foil, an adhesive resin layer on the outer layer side and a thermoplastic resin outer layer;
• and
• the adhesive resin forming the adhesive resin layer on the inner layer side of said first internal pouch comprises a polyether type urethane resin.