The present invention pertains to an interpolymer comprising; (1) from 5 to 85 mol percent of polymer units derived from one or more vinyl or vinylidene aromatic monomers, (2) from 15 to 95 mol percent of polymer units derived from at least one of ethylene and/or a C3-20 alpha-olefin; and (3) from 0 to 20 mol percent of polymer units derived from one or more of ethylenically unsaturated polymerizable monomers other than those derived from (1) and (2); and wherein said interpolymer contains detectable vinyl or vinylidene aromatic monomer triads.