. . . "erent from the oligomer; and (c) optionally, combining the oligomer of step (a) or the blend of step (b) with a second oligomer of the general formula: Z*k --B--Z*k wherein k is 1, 2, or 4; Z is a functionality reactive with E; and B is an aromatic, aliphatic, or mixed aromatic and aliphatic backbone. 3." .