In another embodiment of the present invention, there is provided a tapered block copolymer corresponding to the formula AB(BA)n wherein A is block of a monovinylidene aromatic monomer and B is a block of butadiene, an n is a number from 0 to 6, said block copolymer being further characterized in that at least one of the junctions between an A block and a B block is tapered such that the total amo