An adhesive composition comprising (1) a liquid inert organic vehicle, (2) a thermoplastic elastomeric block copolymer of the type AB(A)n, wherein A represents terminal non-elastomeric polymer blocks; B an elastomeric polymer block, which may be branched; and n a number between 1 and 10; and (3) a polymer containing 2 to 5 reactive isocyanate groups per molecule and having a polymer chain with a molecular weight of between 500 and 10,000.