Adhesive compositions based on polypropylene modified by grafting an unsaturated monomer

An adhesive composition consisting essentially of the reaction product of (a) a polypropylene compound consisting of polypropylene modified by grafting thereto an unsaturated monomer bearing an acid anhydride group, with (b) a compound R, bearing at least two alcohol groups, which are reactive with the anhydride group, in an amount such that the molarity ratio, prior to formation of the reaction product and defined as the ratio of the number of reactive groups carried by the compound R to the number of anhydride groups carried by the grafted polypropylene, is from about 0.01 to about 5 and wherein compound R is polyoxyalkyleneglycol.