| abstract |
An adhesive used for forming a removable adhesive layer constituting a packaging material in which a substrate 1 having a plastic layer and a printed layer, the removable adhesive layer, and a sealant substrate 2 are laminated in this order from an outer side, wherein the substrate 1 can be detached so that the sealant substrate 2 is recycled, wherein the adhesive has an acid number of from 5 to 40 mg KOH/g and comprises a polyester polyol component and at least one polyisocyanate component selected from the group consisting of aliphatic polyisocyanates and aromatic-aliphatic polyisocyanates. |